Index: compiler-rt/lib/fuzzer/FuzzerLoop.cpp =================================================================== --- compiler-rt/lib/fuzzer/FuzzerLoop.cpp +++ compiler-rt/lib/fuzzer/FuzzerLoop.cpp @@ -105,7 +105,7 @@ return; Printf("MALLOC[%zd] %p %zd\n", N, ptr, size); if (TraceLevel >= 2 && EF) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); } } @@ -118,7 +118,7 @@ return; Printf("FREE[%zd] %p\n", N, ptr); if (TraceLevel >= 2 && EF) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); } } @@ -129,8 +129,7 @@ Printf("==%d== ERROR: libFuzzer: out-of-memory (malloc(%zd))\n", GetPid(), Size); Printf(" To change the out-of-memory limit use -rss_limit_mb=\n\n"); - if (EF->__sanitizer_print_stack_trace) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); DumpCurrentUnit("oom-"); Printf("SUMMARY: libFuzzer: out-of-memory\n"); PrintFinalStats(); @@ -231,8 +230,7 @@ if (EF->__sanitizer_acquire_crash_state) EF->__sanitizer_acquire_crash_state(); Printf("==%lu== ERROR: libFuzzer: deadly signal\n", GetPid()); - if (EF->__sanitizer_print_stack_trace) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); Printf("NOTE: libFuzzer has rudimentary signal handlers.\n" " Combine libFuzzer with AddressSanitizer or similar for better " "crash reports.\n"); @@ -249,8 +247,7 @@ !EF->__sanitizer_acquire_crash_state()) return; Printf("==%lu== ERROR: libFuzzer: fuzz target exited\n", GetPid()); - if (EF->__sanitizer_print_stack_trace) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); Printf("SUMMARY: libFuzzer: fuzz target exited\n"); DumpCurrentUnit("crash-"); PrintFinalStats(); @@ -296,8 +293,7 @@ DumpCurrentUnit("timeout-"); Printf("==%lu== ERROR: libFuzzer: timeout after %d seconds\n", GetPid(), Seconds); - if (EF->__sanitizer_print_stack_trace) - EF->__sanitizer_print_stack_trace(); + PrintStackTrace(); Printf("SUMMARY: libFuzzer: timeout\n"); PrintFinalStats(); _Exit(Options.TimeoutExitCode); // Stop right now. @@ -312,8 +308,7 @@ "==%lu== ERROR: libFuzzer: out-of-memory (used: %zdMb; limit: %zdMb)\n", GetPid(), GetPeakRSSMb(), Options.RssLimitMb); Printf(" To change the out-of-memory limit use -rss_limit_mb=\n\n"); - if (EF->__sanitizer_print_memory_profile) - EF->__sanitizer_print_memory_profile(95, 8); + PrintMemoryProfile(); DumpCurrentUnit("oom-"); Printf("SUMMARY: libFuzzer: out-of-memory\n"); PrintFinalStats(); Index: compiler-rt/lib/fuzzer/FuzzerUtil.h =================================================================== --- compiler-rt/lib/fuzzer/FuzzerUtil.h +++ compiler-rt/lib/fuzzer/FuzzerUtil.h @@ -40,6 +40,10 @@ std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC); +void PrintStackTrace(); + +void PrintMemoryProfile(); + unsigned NumberOfCpuCores(); // Platform specific functions. Index: compiler-rt/lib/fuzzer/FuzzerUtil.cpp =================================================================== --- compiler-rt/lib/fuzzer/FuzzerUtil.cpp +++ compiler-rt/lib/fuzzer/FuzzerUtil.cpp @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -179,8 +180,12 @@ return Res; } +static std::mutex SymbolizeMutex; + std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC) { - if (!EF->__sanitizer_symbolize_pc) return ""; + std::unique_lock l(SymbolizeMutex, std::try_to_lock); + if (!EF->__sanitizer_symbolize_pc || !l.owns_lock()) + return ""; char PcDescr[1024] = {}; EF->__sanitizer_symbolize_pc(reinterpret_cast(PC), SymbolizedFMT, PcDescr, sizeof(PcDescr)); @@ -195,6 +200,18 @@ Printf(FallbackFMT, PC); } +void PrintStackTrace() { + std::unique_lock l(SymbolizeMutex, std::try_to_lock); + if (EF->__sanitizer_print_stack_trace && l.owns_lock()) + EF->__sanitizer_print_stack_trace(); +} + +void PrintMemoryProfile() { + std::unique_lock l(SymbolizeMutex, std::try_to_lock); + if (EF->__sanitizer_print_memory_profile && l.owns_lock()) + EF->__sanitizer_print_memory_profile(95, 8); +} + unsigned NumberOfCpuCores() { unsigned N = std::thread::hardware_concurrency(); if (!N) { Index: compiler-rt/test/fuzzer/Bingo.h =================================================================== --- /dev/null +++ compiler-rt/test/fuzzer/Bingo.h @@ -0,0 +1 @@ +#define BINGO 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Index: compiler-rt/test/fuzzer/SymbolizeDeadlock.cpp =================================================================== --- /dev/null +++ compiler-rt/test/fuzzer/SymbolizeDeadlock.cpp @@ -0,0 +1,35 @@ +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. + +// Tests that deadlocks do not occur when an OOM occurs during symbolization. + +#include +#include +#include +#include +#include +#include + +#include "Bingo.h" + +volatile unsigned Sink = 0; + +// Do not inline this function. We want to trigger NEW_FUNC symbolization when +// libFuzzer finds this function. We use a macro to make the name as long +// possible, hoping to increase the time spent in symbolization and increase the +// chances of triggering a deadlock. +__attribute__((noinline)) void BINGO() { + // Busy work. Inserts a delay here so the deadlock is more likely to trigger. + for (unsigned i = 0; i < 330000000; i++) Sink += i; +} + +extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { + assert(Data); + if (Size < 3) return 0; + if (Data[0] == 'F' && + Data[1] == 'U' && + Data[2] == 'Z') + BINGO(); + return 0; +} + Index: compiler-rt/test/fuzzer/symbolize-deadlock.test =================================================================== --- /dev/null +++ compiler-rt/test/fuzzer/symbolize-deadlock.test @@ -0,0 +1,2 @@ +RUN: %cpp_compiler %S/SymbolizeDeadlock.cpp -o %t +RUN: not %t -rss_limit_mb=20 2>&1