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> Here is what faulthandler reports when I trigger it as Python
> is locked in test_socket:
> ...
> File ".../Lib/test/fork_wait.py", line 30 in f
faulthandler doesn't print the source code line (yet?). Here is the code:
class ForkWait(unittest.TestCase):
 ...
 def f(self, id):
 while not self.stop:
 self.alive[id] = os.getpid()
 try:
 time.sleep(SHORTSLEEP) <~~~ here
 except IOError:
 pass
ForkWait.f() is used by ForkWait.test_wait() which creates 4 threads. You may use all_threads=True option of faulthandler to get the backtrace of all threads.
Because ForkWait.test_wait() uses fork, you may also need to dump the backtrace of two processes.
Debug threads+multiple processes is something horrible :-)