I would normally agree, except... This is a refcount issue (I was able to reproduce the problem, gbd shows a free error )
And I wouldn't recommend DGBing a refcount issue as a beginner to debugging. The other mailing list identified a PIL bug that messes up the refcount for True, but this refcount issue is for some tuple object, so may possibly be a different problem. Steve On Sun, Jan 17, 2021 at 9:27 PM Barry <ba...@barrys-emacs.org> wrote: > Run python under gdb and when the segv happens use > the gdb bt command to get a stack trace. > > Also if gdb says that it needs debug symbols install you will need to > do that. Otherwise the not will not contain symbols. > > Barry > > > On 17 Jan 2021, at 19:58, Robin Becker <ro...@reportlab.com> wrote: > > > > I have a segfault in the 3.10 alpha 4 when running the reportlab > document generation; all the other tests seem to have worked. I would like > to ask experts here how to approach getting the location of the problem. I > run recent archlinux. > > > > Below is the output of a test run with -Xdev -Xtracemalloc; the main > process is almost finished so the error appears to come from trying to free > resources > > > >> $ python -Xdev -Xtracemalloc genuserguide.py > /home/robin/devel/reportlab/.py310/lib/python3.10/distutils/__init__.py:1: > DeprecationWarning: the imp module is deprecated in favour of importlib; > see the module's documentation for alternative uses > >> import imp > >> Built story contains 1843 flowables... > >> Saved > "/home/robin/devel/reportlab/REPOS/reportlab/docs/reportlab-userguide.pdf" > >> [ Top 10 ] > >> <frozen importlib._bootstrap_external>:630: size=10.5 MiB, > count=105832, average=104 B > >> /home/robin/devel/reportlab/reportlab/lib/abag.py:19: size=7161 KiB, > count=27126, average=270 B > >> /home/robin/devel/reportlab/reportlab/platypus/paraparser.py:3141: > size=3364 KiB, count=5980, average=576 B > >> > /home/robin/devel/reportlab/.py310/lib/python3.10/site-packages/pyphen/__init__.py:160: > size=2905 KiB, count=41797, average=71 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:776: > size=1386 KiB, count=32208, average=44 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:92: > size=1384 KiB, count=26248, average=54 B > >> /home/robin/devel/reportlab/.py310/lib/python3.10/copy.py:280: > size=1232 KiB, count=8827, average=143 B > >> /home/robin/devel/reportlab/reportlab/platypus/frames.py:155: size=1101 > KiB, count=1173, average=962 B > >> <frozen importlib._bootstrap>:241: size=915 KiB, count=8146, > average=115 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:773: > size=881 KiB, count=16104, average=56 B > >> sys:1: ResourceWarning: unclosed file <_io.BufferedReader > name='../images/replogo.gif'> > >> sys:1: ResourceWarning: unclosed file <_io.BufferedReader > name='../images/testimg.gif'> > >> Debug memory block at address p=0x5617c33effe0: API '' > >> 0 bytes originally requested > >> The 7 pad bytes at p-7 are not all FORBIDDENBYTE (0xfd): > >> at p-7: 0x00 *** OUCH > >> at p-6: 0x00 *** OUCH > >> at p-5: 0x00 *** OUCH > >> at p-4: 0x00 *** OUCH > >> at p-3: 0x00 *** OUCH > >> at p-2: 0x00 *** OUCH > >> at p-1: 0x00 *** OUCH > >> Because memory is corrupted at the start, the count of bytes > requested > >> may be bogus, and checking the trailing pad bytes may segfault. > >> The 8 pad bytes at tail=0x5617c33effe0 are not all FORBIDDENBYTE > (0xfd): > >> at tail+0: 0x00 *** OUCH > >> at tail+1: 0x00 *** OUCH > >> at tail+2: 0x00 *** OUCH > >> at tail+3: 0x00 *** OUCH > >> at tail+4: 0x00 *** OUCH > >> at tail+5: 0x00 *** OUCH > >> at tail+6: 0x00 *** OUCH > >> at tail+7: 0x00 *** OUCH > >> Enable tracemalloc to get the memory block allocation traceback > >> Fatal Python error: _PyMem_DebugRawFree: bad ID: Allocated using API > '', verified using API 'o' > >> Python runtime state: finalizing (tstate=0x5617c53c8b30) > >> Current thread 0x00007fd5742b3740 (most recent call first): > >> <no Python frame> > >> Aborted (core dumped) > > > > > > for comparison here is the 3.9.1 output> $ python -Xdev -Xtracemalloc > genuserguide.py > >> > /home/robin/devel/reportlab/.py39/lib/python3.9/distutils/__init__.py:1: > DeprecationWarning: the imp module is deprecated in favour of importlib; > see the module's documentation for alternative uses > >> import imp > >> > /home/robin/devel/reportlab/.py39/lib/python3.9/site-packages/fontTools/misc/py23.py:11: > DeprecationWarning: The py23 module has been deprecated and will be removed > in the next release. Please update your code. > >> warnings.warn( > >> Built story contains 1843 flowables... > >> Saved > "/home/robin/devel/reportlab/REPOS/reportlab/docs/reportlab-userguide.pdf" > >> [ Top 10 ] > >> <frozen importlib._bootstrap_external>:587: size=12.4 MiB, > count=128010, average=102 B > >> /home/robin/devel/reportlab/reportlab/lib/abag.py:19: size=7132 KiB, > count=26951, average=271 B > >> /home/robin/devel/reportlab/reportlab/platypus/paraparser.py:3141: > size=3364 KiB, count=5980, average=576 B > >> > /home/robin/devel/reportlab/.py39/lib/python3.9/site-packages/pyphen/__init__.py:160: > size=2905 KiB, count=41797, average=71 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:776: > size=1386 KiB, count=32208, average=44 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:92: > size=1384 KiB, count=26248, average=54 B > >> /home/robin/devel/reportlab/.py39/lib/python3.9/copy.py:279: size=1230 > KiB, count=8827, average=143 B > >> /home/robin/devel/reportlab/reportlab/platypus/frames.py:155: size=1039 > KiB, count=957, average=1112 B > >> <frozen importlib._bootstrap>:228: size=959 KiB, count=8503, > average=116 B > >> /home/robin/devel/reportlab/reportlab/platypus/paragraph.py:773: > size=881 KiB, count=16104, average=56 B > >> sys:1: ResourceWarning: unclosed file <_io.BufferedReader > name='../images/replogo.gif'> > >> sys:1: ResourceWarning: unclosed file <_io.BufferedReader > name='../images/testimg.gif'> > > > > > > -- > > https://mail.python.org/mailman/listinfo/python-list > > > > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
