Charles-François Natali <[email protected]> added the comment:
> Looking closely to the gdb stack, there is that frame:
Yeah, but it calls _free, which runs unlocked. That's not the problem.
> I am still unable to reproduce the bug in a simple script.
Try with this one:
"""
import multiprocessing.heap
tab = []
for i in range(100000):
print(i)
b = multiprocessing.heap.BufferWrapper(10)
# create a circular reference (we want GC and not refcount collection when
# the block goes out of scope)
b.tab = tab
tab.append(b)
# drop buffers refcount to 0 to make them eligible to GC
if i % 100 == 0:
del tab
tab = []
"""
It deadlocks pretty quickly (well, on my box).
And, as expected, disabling/enabling the GC inside malloc solves the problem.
I have to think a little bit more for a clean solution.
----------
nosy: +pitrou
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<http://bugs.python.org/issue12352>
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