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145
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1 //===-- tsan_rtl_report.cpp -----------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is a part of ThreadSanitizer (TSan), a race detector.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "sanitizer_common/sanitizer_libc.h"
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14 #include "sanitizer_common/sanitizer_placement_new.h"
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15 #include "sanitizer_common/sanitizer_stackdepot.h"
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16 #include "sanitizer_common/sanitizer_common.h"
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17 #include "sanitizer_common/sanitizer_stacktrace.h"
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18 #include "tsan_platform.h"
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19 #include "tsan_rtl.h"
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20 #include "tsan_suppressions.h"
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21 #include "tsan_symbolize.h"
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22 #include "tsan_report.h"
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23 #include "tsan_sync.h"
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24 #include "tsan_mman.h"
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25 #include "tsan_flags.h"
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26 #include "tsan_fd.h"
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27
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28 namespace __tsan {
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29
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30 using namespace __sanitizer;
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31
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32 static ReportStack *SymbolizeStack(StackTrace trace);
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33
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34 void TsanCheckFailed(const char *file, int line, const char *cond,
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35 u64 v1, u64 v2) {
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36 // There is high probability that interceptors will check-fail as well,
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37 // on the other hand there is no sense in processing interceptors
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38 // since we are going to die soon.
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39 ScopedIgnoreInterceptors ignore;
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40 #if !SANITIZER_GO
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41 cur_thread()->ignore_sync++;
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42 cur_thread()->ignore_reads_and_writes++;
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43 #endif
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44 Printf("FATAL: ThreadSanitizer CHECK failed: "
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45 "%s:%d \"%s\" (0x%zx, 0x%zx)\n",
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46 file, line, cond, (uptr)v1, (uptr)v2);
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47 PrintCurrentStackSlow(StackTrace::GetCurrentPc());
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48 Die();
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49 }
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50
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51 // Can be overriden by an application/test to intercept reports.
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52 #ifdef TSAN_EXTERNAL_HOOKS
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53 bool OnReport(const ReportDesc *rep, bool suppressed);
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54 #else
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55 SANITIZER_WEAK_CXX_DEFAULT_IMPL
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56 bool OnReport(const ReportDesc *rep, bool suppressed) {
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57 (void)rep;
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58 return suppressed;
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59 }
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60 #endif
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61
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62 SANITIZER_WEAK_DEFAULT_IMPL
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63 void __tsan_on_report(const ReportDesc *rep) {
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64 (void)rep;
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65 }
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66
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67 static void StackStripMain(SymbolizedStack *frames) {
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68 SymbolizedStack *last_frame = nullptr;
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69 SymbolizedStack *last_frame2 = nullptr;
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70 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
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71 last_frame2 = last_frame;
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72 last_frame = cur;
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73 }
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74
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75 if (last_frame2 == 0)
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76 return;
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77 #if !SANITIZER_GO
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78 const char *last = last_frame->info.function;
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79 const char *last2 = last_frame2->info.function;
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80 // Strip frame above 'main'
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81 if (last2 && 0 == internal_strcmp(last2, "main")) {
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82 last_frame->ClearAll();
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83 last_frame2->next = nullptr;
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84 // Strip our internal thread start routine.
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85 } else if (last && 0 == internal_strcmp(last, "__tsan_thread_start_func")) {
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86 last_frame->ClearAll();
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87 last_frame2->next = nullptr;
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88 // Strip global ctors init.
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89 } else if (last && 0 == internal_strcmp(last, "__do_global_ctors_aux")) {
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90 last_frame->ClearAll();
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91 last_frame2->next = nullptr;
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92 // If both are 0, then we probably just failed to symbolize.
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93 } else if (last || last2) {
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94 // Ensure that we recovered stack completely. Trimmed stack
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95 // can actually happen if we do not instrument some code,
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96 // so it's only a debug print. However we must try hard to not miss it
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97 // due to our fault.
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98 DPrintf("Bottom stack frame is missed\n");
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99 }
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100 #else
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101 // The last frame always point into runtime (gosched0, goexit0, runtime.main).
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102 last_frame->ClearAll();
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103 last_frame2->next = nullptr;
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104 #endif
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105 }
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106
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107 ReportStack *SymbolizeStackId(u32 stack_id) {
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108 if (stack_id == 0)
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109 return 0;
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110 StackTrace stack = StackDepotGet(stack_id);
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111 if (stack.trace == nullptr)
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112 return nullptr;
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113 return SymbolizeStack(stack);
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114 }
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115
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116 static ReportStack *SymbolizeStack(StackTrace trace) {
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117 if (trace.size == 0)
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118 return 0;
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119 SymbolizedStack *top = nullptr;
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120 for (uptr si = 0; si < trace.size; si++) {
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121 const uptr pc = trace.trace[si];
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122 uptr pc1 = pc;
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123 // We obtain the return address, but we're interested in the previous
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124 // instruction.
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125 if ((pc & kExternalPCBit) == 0)
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126 pc1 = StackTrace::GetPreviousInstructionPc(pc);
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127 SymbolizedStack *ent = SymbolizeCode(pc1);
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128 CHECK_NE(ent, 0);
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129 SymbolizedStack *last = ent;
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130 while (last->next) {
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131 last->info.address = pc; // restore original pc for report
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132 last = last->next;
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133 }
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134 last->info.address = pc; // restore original pc for report
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135 last->next = top;
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136 top = ent;
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137 }
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138 StackStripMain(top);
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139
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140 ReportStack *stack = ReportStack::New();
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141 stack->frames = top;
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142 return stack;
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143 }
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144
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145 ScopedReportBase::ScopedReportBase(ReportType typ, uptr tag) {
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146 ctx->thread_registry->CheckLocked();
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147 void *mem = internal_alloc(MBlockReport, sizeof(ReportDesc));
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148 rep_ = new(mem) ReportDesc;
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149 rep_->typ = typ;
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150 rep_->tag = tag;
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151 ctx->report_mtx.Lock();
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152 }
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153
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154 ScopedReportBase::~ScopedReportBase() {
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155 ctx->report_mtx.Unlock();
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156 DestroyAndFree(rep_);
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157 rep_ = nullptr;
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158 }
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159
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160 void ScopedReportBase::AddStack(StackTrace stack, bool suppressable) {
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161 ReportStack **rs = rep_->stacks.PushBack();
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162 *rs = SymbolizeStack(stack);
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163 (*rs)->suppressable = suppressable;
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164 }
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165
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166 void ScopedReportBase::AddMemoryAccess(uptr addr, uptr external_tag, Shadow s,
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167 StackTrace stack, const MutexSet *mset) {
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168 void *mem = internal_alloc(MBlockReportMop, sizeof(ReportMop));
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169 ReportMop *mop = new(mem) ReportMop;
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170 rep_->mops.PushBack(mop);
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171 mop->tid = s.tid();
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172 mop->addr = addr + s.addr0();
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173 mop->size = s.size();
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174 mop->write = s.IsWrite();
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175 mop->atomic = s.IsAtomic();
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176 mop->stack = SymbolizeStack(stack);
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177 mop->external_tag = external_tag;
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178 if (mop->stack)
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179 mop->stack->suppressable = true;
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180 for (uptr i = 0; i < mset->Size(); i++) {
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181 MutexSet::Desc d = mset->Get(i);
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182 u64 mid = this->AddMutex(d.id);
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183 ReportMopMutex mtx = {mid, d.write};
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184 mop->mset.PushBack(mtx);
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185 }
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186 }
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187
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188 void ScopedReportBase::AddUniqueTid(int unique_tid) {
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189 rep_->unique_tids.PushBack(unique_tid);
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190 }
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191
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192 void ScopedReportBase::AddThread(const ThreadContext *tctx, bool suppressable) {
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193 for (uptr i = 0; i < rep_->threads.Size(); i++) {
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194 if ((u32)rep_->threads[i]->id == tctx->tid)
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195 return;
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196 }
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197 void *mem = internal_alloc(MBlockReportThread, sizeof(ReportThread));
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198 ReportThread *rt = new(mem) ReportThread;
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199 rep_->threads.PushBack(rt);
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200 rt->id = tctx->tid;
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201 rt->os_id = tctx->os_id;
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202 rt->running = (tctx->status == ThreadStatusRunning);
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203 rt->name = internal_strdup(tctx->name);
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204 rt->parent_tid = tctx->parent_tid;
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205 rt->thread_type = tctx->thread_type;
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206 rt->stack = 0;
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207 rt->stack = SymbolizeStackId(tctx->creation_stack_id);
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208 if (rt->stack)
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209 rt->stack->suppressable = suppressable;
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210 }
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211
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212 #if !SANITIZER_GO
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213 static bool FindThreadByUidLockedCallback(ThreadContextBase *tctx, void *arg) {
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214 int unique_id = *(int *)arg;
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215 return tctx->unique_id == (u32)unique_id;
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216 }
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217
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218 static ThreadContext *FindThreadByUidLocked(int unique_id) {
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219 ctx->thread_registry->CheckLocked();
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220 return static_cast<ThreadContext *>(
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221 ctx->thread_registry->FindThreadContextLocked(
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222 FindThreadByUidLockedCallback, &unique_id));
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223 }
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224
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225 static ThreadContext *FindThreadByTidLocked(int tid) {
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226 ctx->thread_registry->CheckLocked();
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227 return static_cast<ThreadContext*>(
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228 ctx->thread_registry->GetThreadLocked(tid));
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229 }
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230
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231 static bool IsInStackOrTls(ThreadContextBase *tctx_base, void *arg) {
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232 uptr addr = (uptr)arg;
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233 ThreadContext *tctx = static_cast<ThreadContext*>(tctx_base);
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234 if (tctx->status != ThreadStatusRunning)
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235 return false;
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236 ThreadState *thr = tctx->thr;
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237 CHECK(thr);
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238 return ((addr >= thr->stk_addr && addr < thr->stk_addr + thr->stk_size) ||
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239 (addr >= thr->tls_addr && addr < thr->tls_addr + thr->tls_size));
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240 }
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241
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242 ThreadContext *IsThreadStackOrTls(uptr addr, bool *is_stack) {
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243 ctx->thread_registry->CheckLocked();
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244 ThreadContext *tctx = static_cast<ThreadContext*>(
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245 ctx->thread_registry->FindThreadContextLocked(IsInStackOrTls,
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246 (void*)addr));
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247 if (!tctx)
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248 return 0;
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249 ThreadState *thr = tctx->thr;
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250 CHECK(thr);
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251 *is_stack = (addr >= thr->stk_addr && addr < thr->stk_addr + thr->stk_size);
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252 return tctx;
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253 }
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254 #endif
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255
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256 void ScopedReportBase::AddThread(int unique_tid, bool suppressable) {
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257 #if !SANITIZER_GO
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258 if (const ThreadContext *tctx = FindThreadByUidLocked(unique_tid))
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259 AddThread(tctx, suppressable);
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260 #endif
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261 }
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262
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263 void ScopedReportBase::AddMutex(const SyncVar *s) {
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264 for (uptr i = 0; i < rep_->mutexes.Size(); i++) {
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265 if (rep_->mutexes[i]->id == s->uid)
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266 return;
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267 }
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268 void *mem = internal_alloc(MBlockReportMutex, sizeof(ReportMutex));
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269 ReportMutex *rm = new(mem) ReportMutex;
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270 rep_->mutexes.PushBack(rm);
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271 rm->id = s->uid;
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272 rm->addr = s->addr;
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273 rm->destroyed = false;
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274 rm->stack = SymbolizeStackId(s->creation_stack_id);
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275 }
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276
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277 u64 ScopedReportBase::AddMutex(u64 id) {
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278 u64 uid = 0;
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279 u64 mid = id;
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280 uptr addr = SyncVar::SplitId(id, &uid);
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281 SyncVar *s = ctx->metamap.GetIfExistsAndLock(addr, true);
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282 // Check that the mutex is still alive.
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283 // Another mutex can be created at the same address,
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284 // so check uid as well.
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285 if (s && s->CheckId(uid)) {
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286 mid = s->uid;
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287 AddMutex(s);
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288 } else {
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289 AddDeadMutex(id);
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290 }
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291 if (s)
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292 s->mtx.Unlock();
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293 return mid;
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294 }
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295
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296 void ScopedReportBase::AddDeadMutex(u64 id) {
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297 for (uptr i = 0; i < rep_->mutexes.Size(); i++) {
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298 if (rep_->mutexes[i]->id == id)
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299 return;
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300 }
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301 void *mem = internal_alloc(MBlockReportMutex, sizeof(ReportMutex));
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302 ReportMutex *rm = new(mem) ReportMutex;
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303 rep_->mutexes.PushBack(rm);
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304 rm->id = id;
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305 rm->addr = 0;
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306 rm->destroyed = true;
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307 rm->stack = 0;
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308 }
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309
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310 void ScopedReportBase::AddLocation(uptr addr, uptr size) {
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311 if (addr == 0)
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312 return;
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313 #if !SANITIZER_GO
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314 int fd = -1;
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315 int creat_tid = kInvalidTid;
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316 u32 creat_stack = 0;
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317 if (FdLocation(addr, &fd, &creat_tid, &creat_stack)) {
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318 ReportLocation *loc = ReportLocation::New(ReportLocationFD);
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319 loc->fd = fd;
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320 loc->tid = creat_tid;
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321 loc->stack = SymbolizeStackId(creat_stack);
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322 rep_->locs.PushBack(loc);
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323 ThreadContext *tctx = FindThreadByUidLocked(creat_tid);
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324 if (tctx)
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325 AddThread(tctx);
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326 return;
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327 }
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328 MBlock *b = 0;
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329 Allocator *a = allocator();
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330 if (a->PointerIsMine((void*)addr)) {
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331 void *block_begin = a->GetBlockBegin((void*)addr);
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332 if (block_begin)
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333 b = ctx->metamap.GetBlock((uptr)block_begin);
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334 }
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335 if (b != 0) {
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336 ThreadContext *tctx = FindThreadByTidLocked(b->tid);
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337 ReportLocation *loc = ReportLocation::New(ReportLocationHeap);
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338 loc->heap_chunk_start = (uptr)allocator()->GetBlockBegin((void *)addr);
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339 loc->heap_chunk_size = b->siz;
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340 loc->external_tag = b->tag;
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341 loc->tid = tctx ? tctx->tid : b->tid;
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342 loc->stack = SymbolizeStackId(b->stk);
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343 rep_->locs.PushBack(loc);
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344 if (tctx)
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345 AddThread(tctx);
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346 return;
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347 }
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348 bool is_stack = false;
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349 if (ThreadContext *tctx = IsThreadStackOrTls(addr, &is_stack)) {
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350 ReportLocation *loc =
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351 ReportLocation::New(is_stack ? ReportLocationStack : ReportLocationTLS);
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352 loc->tid = tctx->tid;
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353 rep_->locs.PushBack(loc);
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354 AddThread(tctx);
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355 }
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356 #endif
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357 if (ReportLocation *loc = SymbolizeData(addr)) {
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358 loc->suppressable = true;
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359 rep_->locs.PushBack(loc);
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360 return;
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361 }
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362 }
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363
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364 #if !SANITIZER_GO
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365 void ScopedReportBase::AddSleep(u32 stack_id) {
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366 rep_->sleep = SymbolizeStackId(stack_id);
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367 }
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368 #endif
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369
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370 void ScopedReportBase::SetCount(int count) { rep_->count = count; }
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371
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372 const ReportDesc *ScopedReportBase::GetReport() const { return rep_; }
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373
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374 ScopedReport::ScopedReport(ReportType typ, uptr tag)
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375 : ScopedReportBase(typ, tag) {}
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376
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377 ScopedReport::~ScopedReport() {}
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378
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379 void RestoreStack(int tid, const u64 epoch, VarSizeStackTrace *stk,
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380 MutexSet *mset, uptr *tag) {
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381 // This function restores stack trace and mutex set for the thread/epoch.
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382 // It does so by getting stack trace and mutex set at the beginning of
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383 // trace part, and then replaying the trace till the given epoch.
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384 Trace* trace = ThreadTrace(tid);
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385 ReadLock l(&trace->mtx);
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386 const int partidx = (epoch / kTracePartSize) % TraceParts();
|
|
|
387 TraceHeader* hdr = &trace->headers[partidx];
|
|
|
388 if (epoch < hdr->epoch0 || epoch >= hdr->epoch0 + kTracePartSize)
|
|
|
389 return;
|
|
|
390 CHECK_EQ(RoundDown(epoch, kTracePartSize), hdr->epoch0);
|
|
|
391 const u64 epoch0 = RoundDown(epoch, TraceSize());
|
|
|
392 const u64 eend = epoch % TraceSize();
|
|
|
393 const u64 ebegin = RoundDown(eend, kTracePartSize);
|
|
|
394 DPrintf("#%d: RestoreStack epoch=%zu ebegin=%zu eend=%zu partidx=%d\n",
|
|
|
395 tid, (uptr)epoch, (uptr)ebegin, (uptr)eend, partidx);
|
|
|
396 Vector<uptr> stack;
|
|
|
397 stack.Resize(hdr->stack0.size + 64);
|
|
|
398 for (uptr i = 0; i < hdr->stack0.size; i++) {
|
|
|
399 stack[i] = hdr->stack0.trace[i];
|
|
|
400 DPrintf2(" #%02zu: pc=%zx\n", i, stack[i]);
|
|
|
401 }
|
|
|
402 if (mset)
|
|
|
403 *mset = hdr->mset0;
|
|
|
404 uptr pos = hdr->stack0.size;
|
|
|
405 Event *events = (Event*)GetThreadTrace(tid);
|
|
|
406 for (uptr i = ebegin; i <= eend; i++) {
|
|
|
407 Event ev = events[i];
|
|
|
408 EventType typ = (EventType)(ev >> kEventPCBits);
|
|
|
409 uptr pc = (uptr)(ev & ((1ull << kEventPCBits) - 1));
|
|
|
410 DPrintf2(" %zu typ=%d pc=%zx\n", i, typ, pc);
|
|
|
411 if (typ == EventTypeMop) {
|
|
|
412 stack[pos] = pc;
|
|
|
413 } else if (typ == EventTypeFuncEnter) {
|
|
|
414 if (stack.Size() < pos + 2)
|
|
|
415 stack.Resize(pos + 2);
|
|
|
416 stack[pos++] = pc;
|
|
|
417 } else if (typ == EventTypeFuncExit) {
|
|
|
418 if (pos > 0)
|
|
|
419 pos--;
|
|
|
420 }
|
|
|
421 if (mset) {
|
|
|
422 if (typ == EventTypeLock) {
|
|
|
423 mset->Add(pc, true, epoch0 + i);
|
|
|
424 } else if (typ == EventTypeUnlock) {
|
|
|
425 mset->Del(pc, true);
|
|
|
426 } else if (typ == EventTypeRLock) {
|
|
|
427 mset->Add(pc, false, epoch0 + i);
|
|
|
428 } else if (typ == EventTypeRUnlock) {
|
|
|
429 mset->Del(pc, false);
|
|
|
430 }
|
|
|
431 }
|
|
|
432 for (uptr j = 0; j <= pos; j++)
|
|
|
433 DPrintf2(" #%zu: %zx\n", j, stack[j]);
|
|
|
434 }
|
|
|
435 if (pos == 0 && stack[0] == 0)
|
|
|
436 return;
|
|
|
437 pos++;
|
|
|
438 stk->Init(&stack[0], pos);
|
|
|
439 ExtractTagFromStack(stk, tag);
|
|
|
440 }
|
|
|
441
|
|
|
442 static bool HandleRacyStacks(ThreadState *thr, VarSizeStackTrace traces[2],
|
|
|
443 uptr addr_min, uptr addr_max) {
|
|
|
444 bool equal_stack = false;
|
|
|
445 RacyStacks hash;
|
|
|
446 bool equal_address = false;
|
|
|
447 RacyAddress ra0 = {addr_min, addr_max};
|
|
|
448 {
|
|
|
449 ReadLock lock(&ctx->racy_mtx);
|
|
|
450 if (flags()->suppress_equal_stacks) {
|
|
|
451 hash.hash[0] = md5_hash(traces[0].trace, traces[0].size * sizeof(uptr));
|
|
|
452 hash.hash[1] = md5_hash(traces[1].trace, traces[1].size * sizeof(uptr));
|
|
|
453 for (uptr i = 0; i < ctx->racy_stacks.Size(); i++) {
|
|
|
454 if (hash == ctx->racy_stacks[i]) {
|
|
|
455 VPrintf(2,
|
|
|
456 "ThreadSanitizer: suppressing report as doubled (stack)\n");
|
|
|
457 equal_stack = true;
|
|
|
458 break;
|
|
|
459 }
|
|
|
460 }
|
|
|
461 }
|
|
|
462 if (flags()->suppress_equal_addresses) {
|
|
|
463 for (uptr i = 0; i < ctx->racy_addresses.Size(); i++) {
|
|
|
464 RacyAddress ra2 = ctx->racy_addresses[i];
|
|
|
465 uptr maxbeg = max(ra0.addr_min, ra2.addr_min);
|
|
|
466 uptr minend = min(ra0.addr_max, ra2.addr_max);
|
|
|
467 if (maxbeg < minend) {
|
|
|
468 VPrintf(2, "ThreadSanitizer: suppressing report as doubled (addr)\n");
|
|
|
469 equal_address = true;
|
|
|
470 break;
|
|
|
471 }
|
|
|
472 }
|
|
|
473 }
|
|
|
474 }
|
|
|
475 if (!equal_stack && !equal_address)
|
|
|
476 return false;
|
|
|
477 if (!equal_stack) {
|
|
|
478 Lock lock(&ctx->racy_mtx);
|
|
|
479 ctx->racy_stacks.PushBack(hash);
|
|
|
480 }
|
|
|
481 if (!equal_address) {
|
|
|
482 Lock lock(&ctx->racy_mtx);
|
|
|
483 ctx->racy_addresses.PushBack(ra0);
|
|
|
484 }
|
|
|
485 return true;
|
|
|
486 }
|
|
|
487
|
|
|
488 static void AddRacyStacks(ThreadState *thr, VarSizeStackTrace traces[2],
|
|
|
489 uptr addr_min, uptr addr_max) {
|
|
|
490 Lock lock(&ctx->racy_mtx);
|
|
|
491 if (flags()->suppress_equal_stacks) {
|
|
|
492 RacyStacks hash;
|
|
|
493 hash.hash[0] = md5_hash(traces[0].trace, traces[0].size * sizeof(uptr));
|
|
|
494 hash.hash[1] = md5_hash(traces[1].trace, traces[1].size * sizeof(uptr));
|
|
|
495 ctx->racy_stacks.PushBack(hash);
|
|
|
496 }
|
|
|
497 if (flags()->suppress_equal_addresses) {
|
|
|
498 RacyAddress ra0 = {addr_min, addr_max};
|
|
|
499 ctx->racy_addresses.PushBack(ra0);
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 bool OutputReport(ThreadState *thr, const ScopedReport &srep) {
|
|
|
504 if (!flags()->report_bugs || thr->suppress_reports)
|
|
|
505 return false;
|
|
|
506 atomic_store_relaxed(&ctx->last_symbolize_time_ns, NanoTime());
|
|
|
507 const ReportDesc *rep = srep.GetReport();
|
|
|
508 CHECK_EQ(thr->current_report, nullptr);
|
|
|
509 thr->current_report = rep;
|
|
|
510 Suppression *supp = 0;
|
|
|
511 uptr pc_or_addr = 0;
|
|
|
512 for (uptr i = 0; pc_or_addr == 0 && i < rep->mops.Size(); i++)
|
|
|
513 pc_or_addr = IsSuppressed(rep->typ, rep->mops[i]->stack, &supp);
|
|
|
514 for (uptr i = 0; pc_or_addr == 0 && i < rep->stacks.Size(); i++)
|
|
|
515 pc_or_addr = IsSuppressed(rep->typ, rep->stacks[i], &supp);
|
|
|
516 for (uptr i = 0; pc_or_addr == 0 && i < rep->threads.Size(); i++)
|
|
|
517 pc_or_addr = IsSuppressed(rep->typ, rep->threads[i]->stack, &supp);
|
|
|
518 for (uptr i = 0; pc_or_addr == 0 && i < rep->locs.Size(); i++)
|
|
|
519 pc_or_addr = IsSuppressed(rep->typ, rep->locs[i], &supp);
|
|
|
520 if (pc_or_addr != 0) {
|
|
|
521 Lock lock(&ctx->fired_suppressions_mtx);
|
|
|
522 FiredSuppression s = {srep.GetReport()->typ, pc_or_addr, supp};
|
|
|
523 ctx->fired_suppressions.push_back(s);
|
|
|
524 }
|
|
|
525 {
|
|
|
526 bool old_is_freeing = thr->is_freeing;
|
|
|
527 thr->is_freeing = false;
|
|
|
528 bool suppressed = OnReport(rep, pc_or_addr != 0);
|
|
|
529 thr->is_freeing = old_is_freeing;
|
|
|
530 if (suppressed) {
|
|
|
531 thr->current_report = nullptr;
|
|
|
532 return false;
|
|
|
533 }
|
|
|
534 }
|
|
|
535 PrintReport(rep);
|
|
|
536 __tsan_on_report(rep);
|
|
|
537 ctx->nreported++;
|
|
|
538 if (flags()->halt_on_error)
|
|
|
539 Die();
|
|
|
540 thr->current_report = nullptr;
|
|
|
541 return true;
|
|
|
542 }
|
|
|
543
|
|
|
544 bool IsFiredSuppression(Context *ctx, ReportType type, StackTrace trace) {
|
|
|
545 ReadLock lock(&ctx->fired_suppressions_mtx);
|
|
|
546 for (uptr k = 0; k < ctx->fired_suppressions.size(); k++) {
|
|
|
547 if (ctx->fired_suppressions[k].type != type)
|
|
|
548 continue;
|
|
|
549 for (uptr j = 0; j < trace.size; j++) {
|
|
|
550 FiredSuppression *s = &ctx->fired_suppressions[k];
|
|
|
551 if (trace.trace[j] == s->pc_or_addr) {
|
|
|
552 if (s->supp)
|
|
|
553 atomic_fetch_add(&s->supp->hit_count, 1, memory_order_relaxed);
|
|
|
554 return true;
|
|
|
555 }
|
|
|
556 }
|
|
|
557 }
|
|
|
558 return false;
|
|
|
559 }
|
|
|
560
|
|
|
561 static bool IsFiredSuppression(Context *ctx, ReportType type, uptr addr) {
|
|
|
562 ReadLock lock(&ctx->fired_suppressions_mtx);
|
|
|
563 for (uptr k = 0; k < ctx->fired_suppressions.size(); k++) {
|
|
|
564 if (ctx->fired_suppressions[k].type != type)
|
|
|
565 continue;
|
|
|
566 FiredSuppression *s = &ctx->fired_suppressions[k];
|
|
|
567 if (addr == s->pc_or_addr) {
|
|
|
568 if (s->supp)
|
|
|
569 atomic_fetch_add(&s->supp->hit_count, 1, memory_order_relaxed);
|
|
|
570 return true;
|
|
|
571 }
|
|
|
572 }
|
|
|
573 return false;
|
|
|
574 }
|
|
|
575
|
|
|
576 static bool RaceBetweenAtomicAndFree(ThreadState *thr) {
|
|
|
577 Shadow s0(thr->racy_state[0]);
|
|
|
578 Shadow s1(thr->racy_state[1]);
|
|
|
579 CHECK(!(s0.IsAtomic() && s1.IsAtomic()));
|
|
|
580 if (!s0.IsAtomic() && !s1.IsAtomic())
|
|
|
581 return true;
|
|
|
582 if (s0.IsAtomic() && s1.IsFreed())
|
|
|
583 return true;
|
|
|
584 if (s1.IsAtomic() && thr->is_freeing)
|
|
|
585 return true;
|
|
|
586 return false;
|
|
|
587 }
|
|
|
588
|
|
|
589 void ReportRace(ThreadState *thr) {
|
|
|
590 CheckNoLocks(thr);
|
|
|
591
|
|
|
592 // Symbolizer makes lots of intercepted calls. If we try to process them,
|
|
|
593 // at best it will cause deadlocks on internal mutexes.
|
|
|
594 ScopedIgnoreInterceptors ignore;
|
|
|
595
|
|
|
596 if (!flags()->report_bugs)
|
|
|
597 return;
|
|
|
598 if (!flags()->report_atomic_races && !RaceBetweenAtomicAndFree(thr))
|
|
|
599 return;
|
|
|
600
|
|
|
601 bool freed = false;
|
|
|
602 {
|
|
|
603 Shadow s(thr->racy_state[1]);
|
|
|
604 freed = s.GetFreedAndReset();
|
|
|
605 thr->racy_state[1] = s.raw();
|
|
|
606 }
|
|
|
607
|
|
|
608 uptr addr = ShadowToMem((uptr)thr->racy_shadow_addr);
|
|
|
609 uptr addr_min = 0;
|
|
|
610 uptr addr_max = 0;
|
|
|
611 {
|
|
|
612 uptr a0 = addr + Shadow(thr->racy_state[0]).addr0();
|
|
|
613 uptr a1 = addr + Shadow(thr->racy_state[1]).addr0();
|
|
|
614 uptr e0 = a0 + Shadow(thr->racy_state[0]).size();
|
|
|
615 uptr e1 = a1 + Shadow(thr->racy_state[1]).size();
|
|
|
616 addr_min = min(a0, a1);
|
|
|
617 addr_max = max(e0, e1);
|
|
|
618 if (IsExpectedReport(addr_min, addr_max - addr_min))
|
|
|
619 return;
|
|
|
620 }
|
|
|
621
|
|
|
622 ReportType typ = ReportTypeRace;
|
|
|
623 if (thr->is_vptr_access && freed)
|
|
|
624 typ = ReportTypeVptrUseAfterFree;
|
|
|
625 else if (thr->is_vptr_access)
|
|
|
626 typ = ReportTypeVptrRace;
|
|
|
627 else if (freed)
|
|
|
628 typ = ReportTypeUseAfterFree;
|
|
|
629
|
|
|
630 if (IsFiredSuppression(ctx, typ, addr))
|
|
|
631 return;
|
|
|
632
|
|
|
633 const uptr kMop = 2;
|
|
|
634 VarSizeStackTrace traces[kMop];
|
|
|
635 uptr tags[kMop] = {kExternalTagNone};
|
|
|
636 uptr toppc = TraceTopPC(thr);
|
|
|
637 if (toppc >> kEventPCBits) {
|
|
|
638 // This is a work-around for a known issue.
|
|
|
639 // The scenario where this happens is rather elaborate and requires
|
|
|
640 // an instrumented __sanitizer_report_error_summary callback and
|
|
|
641 // a __tsan_symbolize_external callback and a race during a range memory
|
|
|
642 // access larger than 8 bytes. MemoryAccessRange adds the current PC to
|
|
|
643 // the trace and starts processing memory accesses. A first memory access
|
|
|
644 // triggers a race, we report it and call the instrumented
|
|
|
645 // __sanitizer_report_error_summary, which adds more stuff to the trace
|
|
|
646 // since it is intrumented. Then a second memory access in MemoryAccessRange
|
|
|
647 // also triggers a race and we get here and call TraceTopPC to get the
|
|
|
648 // current PC, however now it contains some unrelated events from the
|
|
|
649 // callback. Most likely, TraceTopPC will now return a EventTypeFuncExit
|
|
|
650 // event. Later we subtract -1 from it (in GetPreviousInstructionPc)
|
|
|
651 // and the resulting PC has kExternalPCBit set, so we pass it to
|
|
|
652 // __tsan_symbolize_external_ex. __tsan_symbolize_external_ex is within its
|
|
|
653 // rights to crash since the PC is completely bogus.
|
|
|
654 // test/tsan/double_race.cpp contains a test case for this.
|
|
|
655 toppc = 0;
|
|
|
656 }
|
|
|
657 ObtainCurrentStack(thr, toppc, &traces[0], &tags[0]);
|
|
|
658 if (IsFiredSuppression(ctx, typ, traces[0]))
|
|
|
659 return;
|
|
|
660
|
|
|
661 // MutexSet is too large to live on stack.
|
|
|
662 Vector<u64> mset_buffer;
|
|
|
663 mset_buffer.Resize(sizeof(MutexSet) / sizeof(u64) + 1);
|
|
|
664 MutexSet *mset2 = new(&mset_buffer[0]) MutexSet();
|
|
|
665
|
|
|
666 Shadow s2(thr->racy_state[1]);
|
|
|
667 RestoreStack(s2.tid(), s2.epoch(), &traces[1], mset2, &tags[1]);
|
|
|
668 if (IsFiredSuppression(ctx, typ, traces[1]))
|
|
|
669 return;
|
|
|
670
|
|
|
671 if (HandleRacyStacks(thr, traces, addr_min, addr_max))
|
|
|
672 return;
|
|
|
673
|
|
|
674 // If any of the accesses has a tag, treat this as an "external" race.
|
|
|
675 uptr tag = kExternalTagNone;
|
|
|
676 for (uptr i = 0; i < kMop; i++) {
|
|
|
677 if (tags[i] != kExternalTagNone) {
|
|
|
678 typ = ReportTypeExternalRace;
|
|
|
679 tag = tags[i];
|
|
|
680 break;
|
|
|
681 }
|
|
|
682 }
|
|
|
683
|
|
|
684 ThreadRegistryLock l0(ctx->thread_registry);
|
|
|
685 ScopedReport rep(typ, tag);
|
|
|
686 for (uptr i = 0; i < kMop; i++) {
|
|
|
687 Shadow s(thr->racy_state[i]);
|
|
|
688 rep.AddMemoryAccess(addr, tags[i], s, traces[i],
|
|
|
689 i == 0 ? &thr->mset : mset2);
|
|
|
690 }
|
|
|
691
|
|
|
692 for (uptr i = 0; i < kMop; i++) {
|
|
|
693 FastState s(thr->racy_state[i]);
|
|
|
694 ThreadContext *tctx = static_cast<ThreadContext*>(
|
|
|
695 ctx->thread_registry->GetThreadLocked(s.tid()));
|
|
|
696 if (s.epoch() < tctx->epoch0 || s.epoch() > tctx->epoch1)
|
|
|
697 continue;
|
|
|
698 rep.AddThread(tctx);
|
|
|
699 }
|
|
|
700
|
|
|
701 rep.AddLocation(addr_min, addr_max - addr_min);
|
|
|
702
|
|
|
703 #if !SANITIZER_GO
|
|
|
704 {
|
|
|
705 Shadow s(thr->racy_state[1]);
|
|
|
706 if (s.epoch() <= thr->last_sleep_clock.get(s.tid()))
|
|
|
707 rep.AddSleep(thr->last_sleep_stack_id);
|
|
|
708 }
|
|
|
709 #endif
|
|
|
710
|
|
|
711 if (!OutputReport(thr, rep))
|
|
|
712 return;
|
|
|
713
|
|
|
714 AddRacyStacks(thr, traces, addr_min, addr_max);
|
|
|
715 }
|
|
|
716
|
|
|
717 void PrintCurrentStack(ThreadState *thr, uptr pc) {
|
|
|
718 VarSizeStackTrace trace;
|
|
|
719 ObtainCurrentStack(thr, pc, &trace);
|
|
|
720 PrintStack(SymbolizeStack(trace));
|
|
|
721 }
|
|
|
722
|
|
|
723 // Always inlining PrintCurrentStackSlow, because LocatePcInTrace assumes
|
|
|
724 // __sanitizer_print_stack_trace exists in the actual unwinded stack, but
|
|
|
725 // tail-call to PrintCurrentStackSlow breaks this assumption because
|
|
|
726 // __sanitizer_print_stack_trace disappears after tail-call.
|
|
|
727 // However, this solution is not reliable enough, please see dvyukov's comment
|
|
|
728 // http://reviews.llvm.org/D19148#406208
|
|
|
729 // Also see PR27280 comment 2 and 3 for breaking examples and analysis.
|
|
|
730 ALWAYS_INLINE
|
|
|
731 void PrintCurrentStackSlow(uptr pc) {
|
|
|
732 #if !SANITIZER_GO
|
|
|
733 uptr bp = GET_CURRENT_FRAME();
|
|
|
734 BufferedStackTrace *ptrace =
|
|
|
735 new(internal_alloc(MBlockStackTrace, sizeof(BufferedStackTrace)))
|
|
|
736 BufferedStackTrace();
|
|
|
737 ptrace->Unwind(pc, bp, nullptr, false);
|
|
|
738
|
|
|
739 for (uptr i = 0; i < ptrace->size / 2; i++) {
|
|
|
740 uptr tmp = ptrace->trace_buffer[i];
|
|
|
741 ptrace->trace_buffer[i] = ptrace->trace_buffer[ptrace->size - i - 1];
|
|
|
742 ptrace->trace_buffer[ptrace->size - i - 1] = tmp;
|
|
|
743 }
|
|
|
744 PrintStack(SymbolizeStack(*ptrace));
|
|
|
745 #endif
|
|
|
746 }
|
|
|
747
|
|
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748 } // namespace __tsan
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749
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750 using namespace __tsan;
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751
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752 extern "C" {
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753 SANITIZER_INTERFACE_ATTRIBUTE
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754 void __sanitizer_print_stack_trace() {
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755 PrintCurrentStackSlow(StackTrace::GetCurrentPc());
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756 }
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757 } // extern "C"
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