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bc8d8f5302
Minimal HIP program that demonstrates the assertion failure in tracy-capture when connecting to a TRACY_ON_DEMAND + TRACY_ROCPROF application. See examples/RocprofOnDemandRepro/README.md for details. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
// Reproduces the rocprofiler on-demand profiling crash.
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//
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// When Tracy is built with TRACY_ON_DEMAND, a late-connecting profiler
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// (tracy-capture / GUI) triggers an assertion failure in the server:
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//
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// Assertion `ctx' failed in ProcessGpuZoneBeginImplCommon
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//
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// Root cause: gpu_context_allocate() writes a GpuNewContext queue item
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// but does not call DeferItem(), so the context is never replayed to a
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// late-connecting client. The client then receives GpuZoneBegin events
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// for a context it has never seen.
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//
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// A secondary issue: tool_callback_tracing_callback() guards ALL
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// callbacks on data->init, which is only set after the calibration
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// thread allocates the GPU context. Kernel symbol registrations
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// (CODE_OBJECT_DEVICE_KERNEL_SYMBOL_REGISTER) happen at HIP init time,
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// before data->init is true, so they are silently dropped. This causes
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// kernel names to be missing in the profiler.
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//
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// Usage:
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// make
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// ./repro &
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// tracy-capture -o repro.tracy -s 5
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//
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// Expected (unpatched): tracy-capture crashes with assertion failure
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// Expected (patched): capture succeeds with GPU zones showing kernel names
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#include <cstdio>
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#include <unistd.h>
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#include <hip/hip_runtime.h>
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#include "tracy/Tracy.hpp"
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__global__ void vectorAdd( const float* a, const float* b, float* c, int n )
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{
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int i = blockIdx.x * blockDim.x + threadIdx.x;
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if( i < n ) c[i] = a[i] + b[i];
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}
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int main()
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{
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printf( "Rocprofiler on-demand repro — waiting for profiler to connect...\n" );
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fflush( stdout );
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constexpr int N = 1024;
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float h_a[N], h_b[N], h_c[N];
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float *d_a, *d_b, *d_c;
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for( int i = 0; i < N; i++ )
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{
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h_a[i] = float( i );
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h_b[i] = float( i * 2 );
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}
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(void)hipMalloc( &d_a, N * sizeof( float ) );
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(void)hipMalloc( &d_b, N * sizeof( float ) );
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(void)hipMalloc( &d_c, N * sizeof( float ) );
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(void)hipMemcpy( d_a, h_a, N * sizeof( float ), hipMemcpyHostToDevice );
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(void)hipMemcpy( d_b, h_b, N * sizeof( float ), hipMemcpyHostToDevice );
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// Run many iterations so tracy-capture has time to connect.
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// With 100ms sleep per iteration this runs for ~10 seconds.
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for( int iter = 0; iter < 100; iter++ )
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{
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ZoneScopedN( "iteration" );
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vectorAdd<<<( N + 255 ) / 256, 256>>>( d_a, d_b, d_c, N );
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(void)hipDeviceSynchronize();
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usleep( 100000 );
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FrameMark;
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}
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(void)hipMemcpy( h_c, d_c, N * sizeof( float ), hipMemcpyDeviceToHost );
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bool ok = true;
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for( int i = 0; i < N; i++ )
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{
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if( h_c[i] != h_a[i] + h_b[i] ) { ok = false; break; }
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}
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printf( "Result: %s\n", ok ? "PASS" : "FAIL" );
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(void)hipFree( d_a );
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(void)hipFree( d_b );
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(void)hipFree( d_c );
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return ok ? 0 : 1;
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}
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