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don't print task backtrace for GC threads #51413

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Sep 22, 2023
Merged

don't print task backtrace for GC threads #51413

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6 changes: 6 additions & 0 deletions src/stackwalk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1125,6 +1125,8 @@ JL_DLLEXPORT void jl_print_backtrace(void) JL_NOTSAFEPOINT
jlbacktrace();
}

extern int gc_first_tid;

// Print backtraces for all live tasks, for all threads.
// WARNING: this is dangerous and can crash if used outside of gdb, if
// all of Julia's threads are not stopped!
Expand All @@ -1133,6 +1135,10 @@ JL_DLLEXPORT void jl_print_task_backtraces(int show_done) JL_NOTSAFEPOINT
size_t nthreads = jl_atomic_load_acquire(&jl_n_threads);
jl_ptls_t *allstates = jl_atomic_load_relaxed(&jl_all_tls_states);
for (size_t i = 0; i < nthreads; i++) {
// skip GC threads since they don't have tasks
if (gc_first_tid <= i && i < gc_first_tid + jl_n_gcthreads) {
continue;
}
jl_ptls_t ptls2 = allstates[i];
arraylist_t *live_tasks = &ptls2->heap.live_tasks;
size_t n = live_tasks->len;
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