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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 2015857
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2015857
Title:
Repeatedly unusable truncated crash files (on log-out)
Status in apport package in Ubuntu:
Triaged
Status in linux package in Ubuntu:
Incomplete
Bug description:
Repeatedly unusable truncated crash files:
Bug 2012974, bug 2015842, bug 2015140, bug 2012075
Based on my own testing, the problems seems to happen if multiple
binaries crash simultaneously (like at logout). One crash file gets
fully written and the other is incomplete.
If I remove apport from the equation and just get the kernel to dump
core files then the core files are always written reliably (should be
several hundred MB in the case of gnome-shell).
Running `apport-retrace -g $crash` on the .crash files will fail with
"/tmp/apport_core_[...] is not a core dump: file format not
recognized"
Steps to reproduce
==================
1. Use Ubuntu 23.04 (lunar) desktop with GNOME shell
2. Downgrade gjs and libgjs0g to 1.76.0-1 (for triggering bug 1974293)
3. Remove all crashes: `sudo rm -f /var/crash/*`
4. Interact with the desktop, icon grid and calendar for 30 seconds.
5. Log out.
6. Crash files written.
To test the core file, either use `apport-unpack` on the
/var/crash/*.crash file to extract the CoreDump file or use `apport-
retrace -g` on the .crash file. It will fail to print the backtrace:
```
$ apport-retrace -g /var/crash/_usr_bin_gnome-shell.1000.crash
[...]
Warnung: Error reading shared library list entry at 0x646c747200000000
Failed to read a valid object file image from memory.
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal SIGSEGV, Segmentation fault.
Warnung: Section `.reg-xstate/10527' in core file too small.
(gdb) bt
#0 0x00007fe1c8090ffb in ?? ()
Backtrace stopped: Cannot access memory at address 0x7ffd59a40fe0
```
You can use the 0001-apport-Write-coredump-at-beginning-and-quit.patch
on apport to only write the coredump and adjust the slowdown to 100%
reproduce the behavior on log-out.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/2015857/+subscriptions
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