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gh-112367: Only free perf trampoline arenas at shutdown (#112368)

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Signed-off-by: Pablo Galindo <pablogsal@gmail.com>
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Pablo Galindo Salgado 2023-12-01 13:20:51 +00:00 committed by GitHub
parent bfb576ee23
commit a73aa48e6b
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 39 additions and 6 deletions
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1
Include/internal/pycore_ceval.h
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@ -101,6 +101,7 @@ extern int _PyPerfTrampoline_SetCallbacks(_PyPerf_Callbacks *);
extern void _PyPerfTrampoline_GetCallbacks(_PyPerf_Callbacks *);
extern int _PyPerfTrampoline_Init(int activate);
extern int _PyPerfTrampoline_Fini(void);
extern void _PyPerfTrampoline_FreeArenas(void);
extern int _PyIsPerfTrampolineActive(void);
extern PyStatus _PyPerfTrampoline_AfterFork_Child(void);
#ifdef PY_HAVE_PERF_TRAMPOLINE

2
Misc/NEWS.d/next/Core and Builtins/2023-11-24-14-10-57.gh-issue-112367.9z1IDp.rst Normal file
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@ -0,0 +1,2 @@
Avoid undefined behaviour when using the perf trampolines by not freeing the
code arenas until shutdown. Patch by Pablo Galindo

40
Python/perf_trampoline.c
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@ -216,10 +216,24 @@ perf_map_write_entry(void *state, const void *code_addr,
PyMem_RawFree(perf_map_entry);
}
static void*
perf_map_init_state(void)
{
PyUnstable_PerfMapState_Init();
return NULL;
}
static int
perf_map_free_state(void *state)
{
PyUnstable_PerfMapState_Fini();
return 0;
}
_PyPerf_Callbacks _Py_perfmap_callbacks = {
NULL,
&perf_map_init_state,
&perf_map_write_entry,
NULL,
&perf_map_free_state,
};
static int
@ -415,7 +429,6 @@ _PyPerfTrampoline_SetCallbacks(_PyPerf_Callbacks *callbacks)
trampoline_api.write_state = callbacks->write_state;
trampoline_api.free_state = callbacks->free_state;
trampoline_api.state = NULL;
perf_status = PERF_STATUS_OK;
#endif
return 0;
}
@ -434,6 +447,7 @@ _PyPerfTrampoline_Init(int activate)
}
if (!activate) {
tstate->interp->eval_frame = NULL;
perf_status = PERF_STATUS_NO_INIT;
}
else {
tstate->interp->eval_frame = py_trampoline_evaluator;
@ -444,6 +458,9 @@ _PyPerfTrampoline_Init(int activate)
if (extra_code_index == -1) {
return -1;
}
if (trampoline_api.state == NULL && trampoline_api.init_state != NULL) {
trampoline_api.state = trampoline_api.init_state();
}
perf_status = PERF_STATUS_OK;
}
#endif
@ -454,16 +471,29 @@ int
_PyPerfTrampoline_Fini(void)
{
#ifdef PY_HAVE_PERF_TRAMPOLINE
if (perf_status != PERF_STATUS_OK) {
return 0;
}
PyThreadState *tstate = _PyThreadState_GET();
if (tstate->interp->eval_frame == py_trampoline_evaluator) {
tstate->interp->eval_frame = NULL;
}
free_code_arenas();
if (perf_status == PERF_STATUS_OK) {
trampoline_api.free_state(trampoline_api.state);
}
extra_code_index = -1;
perf_status = PERF_STATUS_NO_INIT;
#endif
return 0;
}
void _PyPerfTrampoline_FreeArenas(void) {
#ifdef PY_HAVE_PERF_TRAMPOLINE
free_code_arenas();
#endif
return;
}
int
PyUnstable_PerfTrampoline_SetPersistAfterFork(int enable){
#ifdef PY_HAVE_PERF_TRAMPOLINE
@ -477,8 +507,8 @@ PyStatus
_PyPerfTrampoline_AfterFork_Child(void)
{
#ifdef PY_HAVE_PERF_TRAMPOLINE
PyUnstable_PerfMapState_Fini();
if (persist_after_fork) {
_PyPerfTrampoline_Fini();
char filename[256];
pid_t parent_pid = getppid();
snprintf(filename, sizeof(filename), "/tmp/perf-%d.map", parent_pid);

2
Python/pylifecycle.c
View File

@ -1797,6 +1797,7 @@ finalize_interp_clear(PyThreadState *tstate)
_PyArg_Fini();
_Py_ClearFileSystemEncoding();
_PyPerfTrampoline_Fini();
_PyPerfTrampoline_FreeArenas();
}
finalize_interp_types(tstate->interp);
@ -1854,7 +1855,6 @@ Py_FinalizeEx(void)
*/
_PyAtExit_Call(tstate->interp);
PyUnstable_PerfMapState_Fini();
/* Copy the core config, PyInterpreterState_Delete() free
the core config memory */