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
