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[sanitizer] VReport BeforeFork/AfterFork (#111900)

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Forks are common suspects for unusual sanitizer behavior.
It can be handy to see them without rebuild.
This commit is contained in:
Vitaly Buka 2024-10-10 13:12:36 -07:00 committed by GitHub
parent b3554265f2
commit 36bd9aebc4
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GPG Key ID: B5690EEEBB952194
6 changed files with 12 additions and 0 deletions
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2
compiler-rt/lib/asan/asan_posix.cpp
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@ -149,6 +149,7 @@ void PlatformTSDDtor(void *tsd) {
# endif
static void BeforeFork() {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
if (CAN_SANITIZE_LEAKS) {
__lsan::LockGlobal();
}
@ -168,6 +169,7 @@ static void AfterFork(bool fork_child) {
if (CAN_SANITIZE_LEAKS) {
__lsan::UnlockGlobal();
}
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
void InstallAtForkHandler() {

2
compiler-rt/lib/dfsan/dfsan_custom.cpp
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@ -2859,6 +2859,7 @@ WRAPPER_ALIAS(__isoc99_sscanf, sscanf)
WRAPPER_ALIAS(__isoc23_sscanf, sscanf)
static void BeforeFork() {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
StackDepotLockBeforeFork();
ChainedOriginDepotLockBeforeFork();
}
@ -2866,6 +2867,7 @@ static void BeforeFork() {
static void AfterFork(bool fork_child) {
ChainedOriginDepotUnlockAfterFork(fork_child);
StackDepotUnlockAfterFork(fork_child);
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
SANITIZER_INTERFACE_ATTRIBUTE

2
compiler-rt/lib/hwasan/hwasan_linux.cpp
View File

@ -528,6 +528,7 @@ uptr TagMemoryAligned(uptr p, uptr size, tag_t tag) {
}
static void BeforeFork() {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
if (CAN_SANITIZE_LEAKS) {
__lsan::LockGlobal();
}
@ -547,6 +548,7 @@ static void AfterFork(bool fork_child) {
if (CAN_SANITIZE_LEAKS) {
__lsan::UnlockGlobal();
}
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
void HwasanInstallAtForkHandler() {

2
compiler-rt/lib/lsan/lsan_posix.cpp
View File

@ -97,6 +97,7 @@ void InstallAtExitCheckLeaks() {
}
static void BeforeFork() {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
LockGlobal();
LockThreads();
LockAllocator();
@ -108,6 +109,7 @@ static void AfterFork(bool fork_child) {
UnlockAllocator();
UnlockThreads();
UnlockGlobal();
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
void InstallAtForkHandler() {

2
compiler-rt/lib/msan/msan_linux.cpp
View File

@ -302,6 +302,7 @@ void MsanTSDDtor(void *tsd) {
# endif
static void BeforeFork() {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
// Usually we lock ThreadRegistry, but msan does not have one.
LockAllocator();
StackDepotLockBeforeFork();
@ -313,6 +314,7 @@ static void AfterFork(bool fork_child) {
StackDepotUnlockAfterFork(fork_child);
UnlockAllocator();
// Usually we unlock ThreadRegistry, but msan does not have one.
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
void InstallAtForkHandler() {

2
compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
View File

@ -806,6 +806,7 @@ int Finalize(ThreadState *thr) {
#if !SANITIZER_GO
void ForkBefore(ThreadState* thr, uptr pc) SANITIZER_NO_THREAD_SAFETY_ANALYSIS {
VReport(2, "BeforeFork tid: %llu\n", GetTid());
GlobalProcessorLock();
// Detaching from the slot makes OnUserFree skip writing to the shadow.
// The slot will be locked so any attempts to use it will deadlock anyway.
@ -847,6 +848,7 @@ static void ForkAfter(ThreadState* thr,
SlotAttachAndLock(thr);
SlotUnlock(thr);
GlobalProcessorUnlock();
VReport(2, "AfterFork tid: %llu\n", GetTid());
}
void ForkParentAfter(ThreadState* thr, uptr pc) { ForkAfter(thr, false); }