#12313: Fix yet another memory leak caused by caching of coercion data
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Reporter: SimonKing | Owner:
Type: defect | Status:
needs_review
Priority: major | Milestone: sage-5.3
Component: memleak | Resolution:
Keywords: coercion weak dictionary | Work issues:
Report Upstream: N/A | Reviewers: Simon King,
Jean-Pierre Flori, John Perry
Authors: Simon King, Jean-Pierre Flori | Merged in:
Dependencies: #11521, #11599, #12969, #12215 | Stopgaps:
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Comment (by SimonKing):
Now that's funny. I tried to keep the store of any `KeyedReference`. But
it turns out that there is always ''exactly one'' dead `KeyedReference`
that raises an attribute error when trying to get the key. Namely, I
inserted the following at the beginning of sage.all.quit_sage:
{{{
#!python
import gc, weakref
KeepRefKeys = []
for r in gc.get_objects():
if isinstance(r, weakref.KeyedRef):
try:
KeepRefKeys.append(r.key)
except AttributeError:
print "Warning, no key for",r
del r
print "all keys are in store"
gc.collect()
print "collection done"
}}}
Then, quitting a normal Sage session, I get
{{{
sage: quit
Exiting Sage (CPU time 0m0.05s, Wall time 0m0.85s).
Warning, no key for <weakref at 0x3d281d0; dead>
all keys are in store
collection done
}}}
and executing the "bad" three-line doctest, I get
{{{
6 tests in 5 items.
6 passed and 0 failed.
Test passed.
Warning, no key for <weakref at 0x3a8f290; dead>
all keys are in store
*** glibc detected *** python: double free or corruption (out):
0x0000000004be6cf0 ***
^CKeyboardInterrupt -- interrupted after 5.4 seconds!
Aborting further tests.
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12313#comment:224>
Sage <http://www.sagemath.org>
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