> The reason why I believe Python is to blame:
Then this should really move to a Python bug tracker.
> With Python 2.1.3, a SIGSEGV in one thread killed them all;
> with Python 2.3.3, a SIGSEGV in one thread kills one
> of them (the main thread, not the thread that got the SIGSEGV)
> but brings the others in a funny state.
> This is on the same OS (Linux 2.4 kernel without NPTL).
> Apparently, Python's handling of SIGSEGV signals
> changed between 2.1.3 and 2.3.3.
SIGSEGV is mentioned only in Python's signalmodule.c. You can use ViewCVS
to show a diff between the 2.1.3 state of that (tag r213) and current HEAD.
I don't see any possibly relevant differences:
> In an earlier post, someone reported that Python explicitely
> blocks most signals in non-main threads.
I'm not clear on exactly what "blocked" means. The comments at the top of
When threads are supported, we want the following semantics:
- only the main thread can set a signal handler
- any thread can get a signal handler
- signals are only delivered to the main thread
That's the intent.
> I verified that in the SIGSEGV case above, all remaining threads
> had "SIGSEGV" blocked.
> I may try to change Python to not block SIGSEGV and see
> whether we get again the old Python 2.1.3 behaviour.
The relevant change is probably in Python/thread_pthread.h. Guido added a
call to pthread_sigmask (or sigprocmask, depending on how broken the
platform pthread support is ...), to PyThread__init_thread(), in revision
2.33. The checkin comment begins:
Add SF patch #468347 -- mask signals for non-main pthreads, by
This patch updates Python/thread_pthread.h to mask all
signals for any thread created. This will keep all
signals masked for any thread that isn't the initial
thread. For Solaris and Linux, the two platforms I was
able to test it on, it solves bug #465673 (pthreads
need signal protection) and probably will solve bug
#219772 (Interactive Interpreter+ Thread -> core dump
That was added before 2.1.3, but looks like it didn't get backported to the
2.1.3 maintenance branch before 2.1.3 was released.
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