void
ah_crap_handler(int signum)
{
printf("\nProgram %s (pid = %d) received signal %d.\n",
_progname,
getpid(),
signum);
printf("Stack:\n");
MozStackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0,
nullptr, 0, nullptr);
printf("Sleeping for %d seconds.\n",_gdb_sleep_duration);
printf("Type 'gdb %s %d' to attach your debugger to this thread.\n",
_progname,
getpid());
// Allow us to be ptraced by gdb on Linux with Yama restrictions enabled.
prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);
sleep(_gdb_sleep_duration);
printf("Done sleeping...\n");
_exit(signum);
}
void
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
#ifdef MOZ_STACKWALKING
MozStackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0, aStream,
0, nullptr);
#endif
}
/**
* This is a variant of |WalkTheStack| that uses |CodeAddressService| to cache
* the results of |NS_DescribeCodeAddress|. If |WalkTheStackCached| is being
* called frequently, it will be a few orders of magnitude faster than
* |WalkTheStack|. However, the cache uses a lot of memory, which can cause
* OOM crashes. Therefore, this should only be used for things like refcount
* logging which walk the stack extremely frequently.
*/
static void
WalkTheStackCached(FILE* aStream)
{
if (!gCodeAddressService) {
gCodeAddressService = new WalkTheStackCodeAddressService();
}
MozStackWalk(PrintStackFrameCached, /* skipFrames */ 2, /* maxFrames */ 0,
aStream, 0, nullptr);
}
void
nsTraceRefcnt::WalkTheStackCached(FILE* aStream)
{
#ifdef MOZ_STACKWALKING
if (!gCodeAddressService) {
gCodeAddressService = new WalkTheStackCodeAddressService();
}
MozStackWalk(PrintStackFrameCached, /* skipFrames */ 2, /* maxFrames */ 0,
aStream, 0, nullptr);
#endif
}
static void
SandboxLogCStack()
{
// Skip 3 frames: one for this module, one for the signal handler in
// libmozsandbox, and one for the signal trampoline.
//
// Warning: this might not print any stack frames. MozStackWalk
// can't walk past the signal trampoline on ARM (bug 968531), and
// x86 frame pointer walking may or may not work (bug 1082276).
MozStackWalk(SandboxPrintStackFrame, /* skip */ 3, /* max */ 0, nullptr);
SANDBOX_LOG_ERROR("end of stack.");
}
static void
WalkTheStackSavingLocations(std::vector<void*>& aLocations)
{
if (!gCodeAddressService) {
gCodeAddressService = new WalkTheStackCodeAddressService();
}
static const int kFramesToSkip =
0 + // this frame gets inlined
1 + // GetSerialNumber
1; // NS_LogCtor
MozStackWalk(RecordStackFrame, kFramesToSkip, /* maxFrames */ 0,
&aLocations, 0, nullptr);
}
static void
GetChromeHangReport(Telemetry::ProcessedStack& aStack,
int32_t& aSystemUptime,
int32_t& aFirefoxUptime)
{
MOZ_ASSERT(winMainThreadHandle);
// The thread we're about to suspend might have the alloc lock
// so allocate ahead of time
std::vector<uintptr_t> rawStack;
rawStack.reserve(MAX_CALL_STACK_PCS);
DWORD ret = ::SuspendThread(winMainThreadHandle);
if (ret == -1) {
return;
}
MozStackWalk(ChromeStackWalker, /* skipFrames */ 0, /* maxFrames */ 0,
reinterpret_cast<void*>(&rawStack),
reinterpret_cast<uintptr_t>(winMainThreadHandle), nullptr);
ret = ::ResumeThread(winMainThreadHandle);
if (ret == -1) {
return;
}
aStack = Telemetry::GetStackAndModules(rawStack);
// Record system uptime (in minutes) at the time of the hang
aSystemUptime = ((GetTickCount() / 1000) - (gTimeout * 2)) / 60;
// Record Firefox uptime (in minutes) at the time of the hang
bool error;
TimeStamp processCreation = TimeStamp::ProcessCreation(error);
if (!error) {
TimeDuration td = TimeStamp::Now() - processCreation;
aFirefoxUptime = (static_cast<int32_t>(td.ToSeconds()) - (gTimeout * 2)) / 60;
} else {
aFirefoxUptime = -1;
}
}
void
nsTraceRefcnt::WalkTheStack(FILE* aStream)
{
MozStackWalk(PrintStackFrame, /* skipFrames */ 2, /* maxFrames */ 0, aStream,
0, nullptr);
}
