STINNER Victor added the comment:
> Assertion failed: !PyErr_Occurred(), file Objects/abstract.c, line 2158
Quick reminder: it's not a major bug if PyObject_Call() is called with an
exception set. The exception will be kept in some cases. But I added the
assertion because the exception is lost in some other cases. Example: calling
hasattr(obj, name) replaces the current exception with an AttributeError and
then clears the AttributeError exception if the object doesn't have the
attribute.
> My guess is that fork() has failed,
Oh good job, it's exactly that: I'm able to reproduce the bug with your unit
test (from your attached patch).
If I recall correctly, there is no overallocation on Solaris (OpenIndiana), and
this buildbot is running low memory (MemoryError is very common). fork() can
likely fail under low memory.
> and because preexec_fn is in use, the code tries to call gc.enable() with the
> fork() exception already set. My patch adds a test and fixes that.
Hum, I think that your patch can be simplified. Replace:
if (pid == -1) {
PyErr_SetFromErrno(PyExc_OSError);
...
if (need_to_reenable_gc && _enable_gc(gc_module)) ...
with:
if (need_to_reenable_gc && _enable_gc(gc_module)) ...
...
if (pid == -1) {
PyErr_SetFromErrno(PyExc_OSError);
What do you think?
> Victor already fixed a similar error for the cleanup branch of
> subprocess_fork_exec() in Issue 22290.
I reproduced the issue on Linux with pyfailmalloc.
You can play with pyfailmalloc to try to find similar bugs. The Bitbucket
repository contains the latest debug_cpython.patch which adds some more checks
to make the analysis faster and more effective, and debug_cpython.gdb contains
commands to run it.
https://bitbucket.org/haypo/pyfailmalloc
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