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bpo-44449: faulthandler don't modify frame refcnt (GH-27850)

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Fix a crash in the signal handler of the faulthandler module: no
longer modify the reference count of frame objects.
This commit is contained in:
Victor Stinner 2021-08-30 15:24:39 +02:00 • committed by GitHub
parent 52bdda50d7
commit fe997e1a67
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 7 additions and 5 deletions
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10
Python/traceback.c
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@ -796,7 +796,10 @@ dump_traceback(int fd, PyThreadState *tstate, int write_header)
PUTS(fd, "Stack (most recent call first):\n");
}
frame = PyThreadState_GetFrame(tstate);
// Use a borrowed reference. Avoid Py_INCREF/Py_DECREF, since this function
// can be called in a signal handler by the faulthandler module which must
// not modify Python objects.
frame = tstate->frame;
if (frame == NULL) {
PUTS(fd, "<no Python frame>\n");
return;
@ -805,17 +808,14 @@ dump_traceback(int fd, PyThreadState *tstate, int write_header)
depth = 0;
while (1) {
if (MAX_FRAME_DEPTH <= depth) {
Py_DECREF(frame);
PUTS(fd, " ...\n");
break;
}
if (!PyFrame_Check(frame)) {
Py_DECREF(frame);
break;
}
dump_frame(fd, frame);
PyFrameObject *back = PyFrame_GetBack(frame);
Py_DECREF(frame);
PyFrameObject *back = frame->f_back;
if (back == NULL) {
break;