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(Merge 3.4) Issue #23571: Enhance Py_FatalError() 

* Display the current Python stack if an exception was raised but the exception
  has no traceback
* Disable faulthandler if an exception was raised (before it was only disabled
  if no exception was raised)
* To display the current Python stack, call PyGILState_GetThisThreadState()
  which works even if the GIL was released
This commit is contained in:
Victor Stinner 2015-03-24 12:01:30 +01:00
parent 0f05cea057 0e98a76b65
commit 10dc48497e
1 changed files with 59 additions and 13 deletions
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72
Python/pylifecycle.c
View File

@ -1244,28 +1244,74 @@ initstdio(void)
}
/* Print the current exception (if an exception is set) with its traceback,
* or display the current Python stack.
*
* Don't call PyErr_PrintEx() and the except hook, because Py_FatalError() is
* called on catastrophic cases. */
static void
_Py_PrintFatalError(int fd)
{
PyObject *exception, *v, *tb;
int has_tb;
PyThreadState *tstate;
PyErr_Fetch(&exception, &v, &tb);
if (exception == NULL) {
/* No current exception */
goto display_stack;
}
PyErr_NormalizeException(&exception, &v, &tb);
if (tb == NULL) {
tb = Py_None;
Py_INCREF(tb);
}
PyException_SetTraceback(v, tb);
if (exception == NULL) {
/* too bad, PyErr_NormalizeException() failed */
goto display_stack;
}
has_tb = (tb != NULL && tb != Py_None);
PyErr_Display(exception, v, tb);
Py_XDECREF(exception);
Py_XDECREF(v);
Py_XDECREF(tb);
if (has_tb)
return;
display_stack:
/* PyGILState_GetThisThreadState() works even if the GIL was released */
tstate = PyGILState_GetThisThreadState();
if (tstate == NULL) {
/* _Py_DumpTracebackThreads() requires the thread state to display
* frames */
return;
}
fputc('\n', stderr);
fflush(stderr);
/* display the current Python stack */
_Py_DumpTracebackThreads(fd, tstate->interp, tstate);
}
/* Print fatal error message and abort */
void
Py_FatalError(const char *msg)
{
const int fd = fileno(stderr);
PyThreadState *tstate;
fprintf(stderr, "Fatal Python error: %s\n", msg);
fflush(stderr); /* it helps in Windows debug build */
if (PyErr_Occurred()) {
PyErr_PrintEx(0);
}
else {
tstate = (PyThreadState*)_Py_atomic_load_relaxed(&_PyThreadState_Current);
if (tstate != NULL) {
fputc('\n', stderr);
fflush(stderr);
_Py_DumpTracebackThreads(fd, tstate->interp, tstate);
}
_PyFaulthandler_Fini();
}
_Py_PrintFatalError(fd);
/* The main purpose of faulthandler is to display the traceback. We already
* did our best to display it. So faulthandler can now be disabled. */
_PyFaulthandler_Fini();
#ifdef MS_WINDOWS
{