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Fail when system tracing fails to start.

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IsSystemTracingFailed reports a SysTraceStart that the preflight could
not predict (the target exiting between the checks, the kernel rejecting
the event setup); starting anyway would capture no samples.
This commit is contained in:
Bartosz Taudul
2026-08-30 16:44:01 +02:00
parent d498829518
commit 2f2d8a7ba9
1 changed files with 14 additions and 0 deletions
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14
monitor/src/monitor.cpp
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@@ -483,6 +483,12 @@ static int RunAttached( pid_t pid )
if( !PreflightSamplingEvent( pid, kernelFrames, hwStats, hwErrno ) ) return 1;
tracy::StartupProfiler();
if( tracy::IsSystemTracingFailed() )
{
fprintf( stderr, "The client failed to start sampling although the preflight passed; the capture would contain no samples (the target may have exited between checks, or the kernel rejected the event setup).\n" );
tracy::ShutdownProfiler();
return 1;
}
if( !VerifyClientListening() )
{
if( const char* port = getenv( "TRACY_PORT" ) )
@@ -603,6 +609,14 @@ static int RunForked( int argc, char** argv )
}
tracy::StartupProfiler();
if( tracy::IsSystemTracingFailed() )
{
fprintf( stderr, "The client failed to start sampling although the preflight passed; the capture would contain no samples (the target may have exited between checks, or the kernel rejected the event setup).\n" );
kill( childPid, SIGKILL );
waitpid( childPid, nullptr, 0 );
tracy::ShutdownProfiler();
return 1;
}
// Detach ptrace and let the child run. If detach fails the child stays
// stopped forever, so this has to be fatal.