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Add jl_print_task_backtraces() #46845

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Oct 15, 2022
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Add jl_print_task_backtraces() #46845

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44 changes: 41 additions & 3 deletions src/stackwalk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -722,7 +722,7 @@ static void JuliaInitializeLongjmpXorKey(void)
}
#endif

JL_UNUSED static uintptr_t ptr_demangle(uintptr_t p)
JL_UNUSED static uintptr_t ptr_demangle(uintptr_t p) JL_NOTSAFEPOINT
{
#if defined(__GLIBC__)
#if defined(_CPU_X86_)
Expand Down Expand Up @@ -854,7 +854,7 @@ _os_ptr_munge(uintptr_t ptr)

extern bt_context_t *jl_to_bt_context(void *sigctx);

void jl_rec_backtrace(jl_task_t *t)
void jl_rec_backtrace(jl_task_t *t) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
jl_ptls_t ptls = ct->ptls;
Expand Down Expand Up @@ -1091,7 +1091,9 @@ JL_DLLEXPORT void jlbacktrace(void) JL_NOTSAFEPOINT
jl_print_bt_entry_codeloc(bt_data + i);
}
}
JL_DLLEXPORT void jlbacktracet(jl_task_t *t)

// Print backtrace for specified task
JL_DLLEXPORT void jlbacktracet(jl_task_t *t) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
jl_ptls_t ptls = ct->ptls;
Expand All @@ -1108,6 +1110,42 @@ JL_DLLEXPORT void jl_print_backtrace(void) JL_NOTSAFEPOINT
jlbacktrace();
}

// 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!
JL_DLLEXPORT void jl_print_task_backtraces(void) JL_NOTSAFEPOINT
{
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for (size_t i = 0; i < jl_n_threads; i++) {
jl_ptls_t ptls2 = jl_all_tls_states[i];
arraylist_t *live_tasks = &ptls2->heap.live_tasks;
size_t n = live_tasks->len;
jl_safe_printf("==== Thread %d created %zu live tasks\n",
ptls2->tid + 1, n + 1);
jl_safe_printf(" ---- Root task (%p)\n", ptls2->root_task);
jl_safe_printf(" (sticky: %d, started: %d, state: %d, tid: %d)\n",
ptls2->root_task->sticky, ptls2->root_task->started,
jl_atomic_load_relaxed(&ptls2->root_task->_state),
jl_atomic_load_relaxed(&ptls2->root_task->tid) + 1);
jlbacktracet(ptls2->root_task);

void **lst = live_tasks->items;
for (size_t j = 0; j < live_tasks->len; j++) {
jl_task_t *t = (jl_task_t *)lst[j];
jl_safe_printf(" ---- Task %zu (%p)\n", j + 1, t);
jl_safe_printf(" (sticky: %d, started: %d, state: %d, tid: %d)\n",
t->sticky, t->started, jl_atomic_load_relaxed(&t->_state),
jl_atomic_load_relaxed(&t->tid) + 1);
if (t->stkbuf != NULL)
jlbacktracet(t);
else
jl_safe_printf(" no stack\n");
jl_safe_printf(" ---- End task %zu\n", j + 1);
}
jl_safe_printf("==== End thread %d\n", ptls2->tid + 1);
}
jl_safe_printf("==== Done\n");
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}

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#ifdef __cplusplus
}
#endif