Python crash when exiting Back In Time

Support Software & Applications
1

Sometimes there is a python crash when exiting backintime (Ctrl+W or Alt+F4).

Has anyone else noticed this?

Snapshots always work fine. In fact, it is not necessary to take a snapshot - just opening and closing the app is sufficient. Sometimes there is no crash (maybe 50/50 chance).

I ask here because backintime is packaged by Manjaro, not Arch.

Feb 16 15:59:16 ********* systemd-coredump[16506]: [🡕] Process 16415 (python) of user 1001 dumped core.
                                                   
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                                                   Module libxcb-randr.so.0 with build-id b6c1c7d4b28863b55ade251813db7f246b7ffe8b
                                                   Module libxcb-keysyms.so.1 with build-id 333e5eb4075795f947c924a2085f17e2e2ae7147
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                                                   Module libxcb-icccm.so.4 with build-id 73f1e12d76af383aa969a60279ed5ed922045f47
                                                   Module libX11-xcb.so.1 with build-id 0db4f94d8ae31b8dc9a83f825a9171656f1e532c
                                                   Module libQt5DBus.so.5 with build-id 91faf7a9b6b7cbcfd37c1e6abb0dad44f7cba2b8
                                                   Module libfontconfig.so.1 with build-id 9fdeb38479c4090d673efc2e8cb60176efe65da1
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                                                   Module libqxcb.so with build-id 4ed3a574ecda7b7f9d019aed428e518d7079ad8f
                                                   Module libnss_files.so.2 with build-id 1a36dfc01d3a1010b2ee79766a24a8090a3266d5
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                                                   Module libexpat.so.1 with build-id c3b8b6921f5b323540b84acd301ccc7bc5bc0428
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                                                   Module libdbus-1.so.3 with build-id 74f2ab9c60512f3a93c932c3f627564d42e0b11e
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                                                   Module binascii.cpython-310-x86_64-linux-gnu.so with build-id d67ab15607e3d51bf69dda2352e196a037413761
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                                                   Module _blake2.cpython-310-x86_64-linux-gnu.so with build-id 77d6785defc3e87b27af6d89a49db90b5d1b3c8b
                                                   Module libcrypto.so.1.1 with build-id 4c926b672d97886b123e03a008387aecf0786de4
                                                   Module _hashlib.cpython-310-x86_64-linux-gnu.so with build-id 7780bf56d2cc121e2743d97fab93487626c9383e
                                                   Module _struct.cpython-310-x86_64-linux-gnu.so with build-id 8356869bb9ba7f9d68dc620211cb9bcdb4866a58
                                                   Module array.cpython-310-x86_64-linux-gnu.so with build-id e9860175d353015d568e4809d04fd2fa253db133
                                                   Module _socket.cpython-310-x86_64-linux-gnu.so with build-id 024777da64193da29bc5a23747203745a895e792
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                                                   Module _json.cpython-310-x86_64-linux-gnu.so with build-id a62769dcf117f89faa63d895cdebe73b622fd6e2
                                                   Module libQt5Widgets.so.5 with build-id 4767af8c8c21020ef7d60235894aefb9504e2f4e
                                                   Module QtWidgets.abi3.so with build-id 0a53efeac674e3412c26bd0477e99f2e8109708a
                                                   Module QtCore.abi3.so with build-id 81ec458d1869ddc5425138c532a282bd4a5705fa
                                                   Module sip.cpython-310-x86_64-linux-gnu.so with build-id 7c77893ba9b264b9823523ae8782ee88e6f37201
                                                   Module libXdmcp.so.6 with build-id 8ca0792d23c8b8b4c0864297512349292bea5955
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                                                   Module libbrotlicommon.so.1 with build-id a4ba3f4b4571c8272343b621da812a6e24a202a7
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                                                   Module libgpg-error.so.0 with build-id 82524ee3d1c4c2244d7cfdcc1e6eea5f9855f6c6
                                                   Module libbrotlidec.so.1 with build-id 45defc036e918e0140a72f1fbce6e7692d38241d
                                                   Module libX11.so.6 with build-id 5ba5798d193c0065014b8c6252a0678671c8d478
                                                   Module libpcre.so.1 with build-id 845483dd0acba86de9f0313102bebbaf3ce52767
                                                   Module libicudata.so.70 with build-id e1dcc2a88cfaafed882d09c90c668af0eed4efed
                                                   Module libgcrypt.so.20 with build-id db45f5d5e0f7af1e77324fea1885f974619ad268
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                                                   Module liblzma.so.5 with build-id 8b615460aa230708c5183f16bede67aa0437d95e
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                                                   Module libz.so.1 with build-id 0c1459c56513efd5d53eb3868290e9afee6a6a26
                                                   Module zlib.cpython-310-x86_64-linux-gnu.so with build-id 7fb461d21989197657cb97b53681b7faa22866ae
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                                                   Module fcntl.cpython-310-x86_64-linux-gnu.so with build-id 1f3dce554d8702ac55d9c9c3423a82b9d2c158e3
                                                   Module _datetime.cpython-310-x86_64-linux-gnu.so with build-id c4c74f043c7fd50799978d7dd3d140e723c1a4b5
                                                   Module math.cpython-310-x86_64-linux-gnu.so with build-id ae0904868d71446628143ff116141e434f48bdaa
                                                   Module ld-linux-x86-64.so.2 with build-id 040cc3dd10461562f177df39e3be2f3704258c3c
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                                                   Module libc.so.6 with build-id 4b406737057708c0e4c642345a703c47a61c73dc
                                                   Module libpython3.10.so.1.0 with build-id 326d16f7cd7d30fc803af16ad00d341dea8dd694
                                                   Module python3.10 with build-id 12c63a5e2c0b1214b6384a2631e9515614ef42a3
                                                   Stack trace of thread 16415:
                                                   #0  0x00007fee5eeb74e0 PyCFunction_Type (libpython3.10.so.1.0 + 0x3ad4e0)
                                                   ELF object binary architecture: AMD x86-64
░░ Subject: Process 16415 (python) dumped core
░░ Defined-By: systemd
░░ Support: https://forum.manjaro.org/c/support
░░ Documentation: man:core(5)
░░ 
░░ Process 16415 (python) crashed and dumped core.
░░ 
░░ This usually indicates a programming error in the crashing program and
░░ should be reported to its vendor as a bug.
1 Like
2

When it crashes:

Feb 16 15:59:16 ********* systemd[1]: home-xxxxx-.local-share-backintime-mnt-18421F5B-mountpoint.mount: Deactivated successfully.
Feb 16 15:59:16 ********* python[16415]: backintime-qt (xxxxx/1): INFO: unmount ssh: xxxxx2@192.168.10.22:./ from /home/xxxxx/.local/share/backintime/mnt/18421F5B/mountpoint
Feb 16 15:59:16 ********* audit[16415]: ANOM_ABEND auid=1001 uid=1001 gid=1002 ses=2 subj==unconfined pid=16415 comm="python" exe="/usr/bin/python3.10" sig=11 res=1
Feb 16 15:59:16 ********* kernel: python[16415]: segfault at 7fee5eeb74e0 ip 00007fee5eeb74e0 sp 00007ffc2f634228 error 15 in libpython3.10.so.1.0[7fee5ee8d000+32000]
Feb 16 15:59:16 ********* kernel: Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <1d> 00 00 00 00 00 00 00 c0 50 eb 5e ee 7f 00 00 00 00 00 00 00 00

When it doesn’t:

Feb 16 17:29:17 ********* systemd[1]: home-xxxxx-.local-share-backintime-mnt-18421F5B-mountpoint.mount: Deactivated successfully.
Feb 16 17:29:17 ********* python[19929]: backintime-qt (xxxxx/1): INFO: unmount ssh: xxxxx2@192.168.10.22:./ from /home/xxxxx/.local/share/backintime/mnt/18421F5B/mountpoint
3

This is the upstream bug report:

And downstream at Fedora, it has been confirmed for python 3.10:
https://bugzilla.redhat.com/show_bug.cgi?id=1844781#c10

1 Like
4

Is this the fix?
https://www.riverbankcomputing.com/pipermail/pyqt/2022-January/044458.html

5

You are the one with the problem - you tell me?

Packaged does not constitute develop - so you will have to direct your query upstream

Perhaps the packager knows more? Do you @Yochanan?

6

Downgrade python-pyqt5 to 5.15.6-7.

7

Please can that version be pushed to Stable branch?

8

I can remove the 5.15.6-7.1 overlay like we did in the unstable branch, but you’ll still have to downgrade to 5.15.6-7 regardless.

9

Of course. Removing overlay would be great, thanks.

10

Done. :white_check_mark:

11

Hi @flux. I have this issue too. I don’t know whether this affects the snapshot quality. I’ve reported the bug on github.

Did you resolve the issue with downgrading?

In my case, the backintime core dump is also accompanied by many lines of an error related to bijiben (gnome-notes application) and bijiben-shell-search provider. Would that be related to Manjaro development?

12

No, the crash is still happening.

I don’t see any problems with the snapshots.

I suspect we are seeing this random behaviour:
https://www.riverbankcomputing.com/static/Docs/PyQt5/gotchas.html#crashes-on-exit

…and I guess that would need to be fixed by Back In Time developers.

1 Like
13

Thanks for replying!

I might open another topic for the bijiben errors, which also appear when I am running usr/bin/bijiben (gnome-notes), because they are endlessly spamming my journal logs.

14

Yeah, I think that’s something else - I don’t have bijiben.

1 Like