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app.py crashed with SIGSEGV in PyCFunction_Type() #1271

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SkyGolem opened this issue Aug 19, 2022 · 10 comments
Closed

app.py crashed with SIGSEGV in PyCFunction_Type() #1271

SkyGolem opened this issue Aug 19, 2022 · 10 comments

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@SkyGolem
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Title: app.py crashed with SIGSEGV in PyCFunction_Type()

DistroRelease: Ubuntu 22.04

StacktraceAddressSignature: /usr/share/backintime/qt/app.py:11:/usr/bin/python3.10+98a0:/usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so+16c3db:/usr/lib/python3/dist-packages/PyQt5/sip.cpython-310-x86_64-linux-gnu.so+10d40:/usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so+16c33d:/usr/bin/python3.10+ec13e:/usr/bin/python3.10+1f7868:/usr/bin/python3.10+1f65ee:/usr/bin/python3.10+1e5a23:/usr/bin/python3.10+1bbe6d:/us
r/lib/x86_64-linux-gnu/libc.so.6+1d90:/usr/lib/x86_64-linux-gnu/libc.so.6+1e40:/usr/bin/python3.10+1bbd65

SegvAnalysis:
Segfault happened at: 0x557b65db38a0 <PyCFunction_Type>: sbb (%rax),%al
PC (0x557b65db38a0) in non-executable VMA region: 0x557b65daa000-0x557b65de9000 rw-p /usr/bin/python3.10
source "(%rax)" (0x557b65db38a0) ok
destination "%al" ok
SegvReason: executing writable VMA /usr/bin/python3.10
SourcePackage: backintime
Stacktrace:
#0 0x0000557b65db38a0 in PyCFunction_Type ()
No symbol table info available.
#1 0x00007f637c0613db in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
No symbol table info available.
#2 0x00007f637c16ed40 in ?? () from /usr/lib/python3/dist-packages/PyQt5/sip.cpython-310-x86_64-linux-gnu.so
No symbol table info available.
#3 0x00007f637c06133d in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
No symbol table info available.
#4 0x0000557b659a013e in ?? ()
No symbol table info available.
#5 0x0000557b65aab868 in ?? ()
No symbol table info available.
#6 0x0000557b65aaa5ee in Py_FinalizeEx ()
No symbol table info available.
#7 0x0000557b65a99a23 in Py_RunMain ()
No symbol table info available.
#8 0x0000557b65a6fe6d in Py_BytesMain ()
No symbol table info available.
#9 0x00007f63807ddd90 in __libc_start_call_main (main=main@entry=0x557b65a6fe30, argc=argc@entry=3, argv=argv@entry=0x7ffe36d92b28) at ../sysdeps/nptl/libc_start_call_main.h:58
self =
result =
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -8827312333837685579, 140729818622760, 93988474781232, 93988478138488, 140065337909312, 8828035491785354421, 8914900511411416245}, mask_was_saved = 0}}, pr
iv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call =
#10 0x00007f63807dde40 in __libc_start_main_impl (main=0x557b65a6fe30, argc=3, argv=0x7ffe36d92b28, init=, fini=, rtld_fini=, stack_end=0x7ffe36d92b18) at ../csu/lib
c-start.c:392
No locals.
#11 0x0000557b65a6fd65 in _start ()
No symbol table info available.
StacktraceAddressSignature: /usr/share/backintime/qt/app.py:11:/usr/bin/python3.10+98a0:/usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so+16c3db:/usr/lib/python3/dist-packages/PyQt5/sip.cpython-310-x86_64-linu
x-gnu.so+10d40:/usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so+16c33d:/usr/bin/python3.10+ec13e:/usr/bin/python3.10+1f7868:/usr/bin/python3.10+1f65ee:/usr/bin/python3.10+1e5a23:/usr/bin/python3.10+1bbe6d:/us
r/lib/x86_64-linux-gnu/libc.so.6+1d90:/usr/lib/x86_64-linux-gnu/libc.so.6+1e40:/usr/bin/python3.10+1bbd65
StacktraceTop:
PyCFunction_Type ()
?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
?? () from /usr/lib/python3/dist-packages/PyQt5/sip.cpython-310-x86_64-linux-gnu.so
?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
?? ()
Tags: third-party-packages jammy
ThreadStacktrace:
.
Thread 3 (Thread 0x7f637a313640 (LWP 20099)):
#0 0x00007f63808ccd7f in __GI___poll (fds=0x7f637a312cc8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
sc_ret = -516
sc_cancel_oldtype = 0
sc_ret =
#1 0x00007f637c1db7e2 in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
No symbol table info available.
#2 0x00007f637c1dd22c in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
No symbol table info available.
#3 0x00007f637a562d08 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
No symbol table info available.
#4 0x00007f637ee1bca1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#5 0x00007f6380848b43 in start_thread (arg=) at ./nptl/pthread_create.c:442
ret =
pd =
out =
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140729818618560, -8827312333838078795, 140065228535360, 2, 140065334659152, 140729818618912, 8915405778247494837, 8914901002514738357}, mask_was_saved = 0}},
priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call =
#6 0x00007f63808daa00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
No locals.
.
Thread 2 (Thread 0x7f6379980640 (LWP 20100)):
#0 0x00007f63808ccd7f in __GI___poll (fds=0x7f636c004ed0, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
sc_ret = -516
sc_cancel_oldtype = 0
sc_ret =
#1 0x00007f637e260696 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2 0x00007f637e2093c3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3 0x00007f637f0620a8 in QEventDispatcherGlib::processEvents(QFlagsQEventLoop::ProcessEventsFlag) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#4 0x00007f637f00774b in QEventLoop::exec(QFlagsQEventLoop::ProcessEventsFlag) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#5 0x00007f637ee1aaf2 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#6 0x00007f637a42af0b in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
No symbol table info available.
#7 0x00007f637ee1bca1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#8 0x00007f6380848b43 in start_thread (arg=) at ./nptl/pthread_create.c:442
ret =
pd =
out =
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140729818618256, -8827312333838078795, 140065218496064, 2, 140065334659152, 140729818618608, 8915408847538498741, 8914901002514738357}, mask_was_saved = 0}},
priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call =
#9 0x00007f63808daa00 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
No locals.
.
Thread 1 (Thread 0x7f63807b3000 (LWP 20097)):
#0 0x0000557b65db38a0 in PyCFunction_Type ()
No symbol table info available.
#1 0x00007f637c0613db in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
No symbol table info available.
#2 0x00007f637c16ed40 in ?? () from /usr/lib/python3/dist-packages/PyQt5/sip.cpython-310-x86_64-linux-gnu.so
No symbol table info available.
#3 0x00007f637c06133d in ?? () from /usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so
No symbol table info available.
#4 0x0000557b659a013e in ?? ()
No symbol table info available.
#5 0x0000557b65aab868 in ?? ()
No symbol table info available.
#6 0x0000557b65aaa5ee in Py_FinalizeEx ()
No symbol table info available.
#7 0x0000557b65a99a23 in Py_RunMain ()
No symbol table info available.
#8 0x0000557b65a6fe6d in Py_BytesMain ()
No symbol table info available.
#9 0x00007f63807ddd90 in __libc_start_call_main (main=main@entry=0x557b65a6fe30, argc=argc@entry=3, argv=argv@entry=0x7ffe36d92b28) at ../sysdeps/nptl/libc_start_call_main.h:58
self =
result =
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -8827312333837685579, 140729818622760, 93988474781232, 93988478138488, 140065337909312, 8828035491785354421, 8914900511411416245}, mask_was_saved = 0}}, pr
iv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call =
#10 0x00007f63807dde40 in __libc_start_main_impl (main=0x557b65a6fe30, argc=3, argv=0x7ffe36d92b28, init=, fini=, rtld_fini=, stack_end=0x7ffe36d92b18) at ../csu/lib
c-start.c:392
No locals.
#11 0x0000557b65a6fd65 in _start ()
No symbol table info available.
@aryoda
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aryoda commented Aug 22, 2022

Is this a reproducible crash? What are the steps to reproduce it?

@SkyGolem
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It happens randomly. Just happened again now, on closing backintime.

@buhtz
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buhtz commented Aug 30, 2022

I am willing to learn how to read such stacktraces. ;)

@aryoda
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aryoda commented Aug 30, 2022

@SkyGolem Which BiT version is installed on Ubuntu 22.04? 1.2.1?

I have no Ubuntu 22.04 up and running and a non-reproducible error is difficult to debug - but in the stacktrace I can see at least:

#0 0x0000557b65db38a0 in PyCFunction_Type ()
No symbol table info available.

  1. Install the [lib]python3*-dbg packages to get symbol information in the traceback (symbol = variable or function name)
  2. If the crash happens again please re-post the traceback here (hopefully it contains more debug information then)

Since the error is a SEGFAULT I'd suspect an error in the Python runtime (see below -> search Cython bug tracker)

/usr/bin/python3.10+1f65ee

Python 3.10 is used (maybe there is a known bug in their tracker for this).

/usr/lib/python3/dist-packages/PyQt5/QtCore.abi3.so

Qt5 is used, there was another ticket with issues using Qt5 AFAIR (not sure if it was already solved).

@aryoda
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aryoda commented Aug 31, 2022

I propose to open a new (additional) issue to improve the documentation:

  • How to collect required diagnostic information about crashes (tracebacks with symbols) for an issue
  • How to diagnose sporadic (non-reproducible) crashes (eg. by enabling logging and tracing)

Perhaps someone should also sketch an issue template with the minimal required environment information and
links to docs for collecting further diagnostics..

@buhtz
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buhtz commented Sep 1, 2022 •
edited
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Good idea. I vote for yes.

It was still back in my head to add some more information's about how to deal/interact/communicate with the project. This could go in an extra md-file (linked from README and CONTRIBUTE file of course) or into the wiki. I don't assume that users will read this by them self. But we can link to it in issues and save us from repeat writing things.

I also have in mind to add some more information's about the used environment and dependencies in the debug output. Have seen that in other projects. ;)

@aryoda
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aryoda commented Sep 1, 2022

I have opened #1278 to request issue templates for the repo as starting point...
Required documentation for the templates could be created when implementing this issue (or as a separate issue if it is to much work).

@aryoda
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aryoda commented Sep 1, 2022

@SkyGolem Which BiT version is installed on Ubuntu 22.04? 1.2.1?

@SkyGolem How did you install BiT? From the standard package "backintime-qt" in Synaptics/"Ubuntu Software"?

If yes: Looking at the dependencies the (IMHO) required debugging symbols can be installed via the packages

  • python3-pyqt5-dbg
  • python3-dbg
  • libpython3.10-dbg

eg. via sudo apt install python3-dbg python3-pyqt5-dbg libpython3.10-dbg

where "-dbg" indicates that it contains the debugging symbols ("function and variable names") to translate memory addresses in tracebacks into source code references.

Please note I have no Ubuntu 22.04 available so my proposed packages are an "educated guess" only and may fail.

If the crash happens again then post the traceback here again. Thanks :-)

@emtiu emtiu mentioned this issue Sep 7, 2022
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@emtiu
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emtiu commented Sep 7, 2022

Thank you for your report, @SkyGolem! I'm closing this as a duplicate of #1095, but we will hopefully be able to use your stacktrace :)

@emtiu emtiu closed this as completed Sep 7, 2022
@SkyGolem
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SkyGolem commented Oct 27, 2022 via email

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@emtiu @aryoda @buhtz @SkyGolem