[Bug 2015857] Re: Repeatedly unusable truncated crash files (on log-out)

Wed Apr 19 12:37:06 UTC 2023

Added package version to the description (apport-collect does not allow
me to collect the data since I am not the original reporter).

** Description changed:

  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.
+ 
+ ApportVersion: 2.26.1-0ubuntu2
+ Architecture: amd64
+ DistroRelease: Ubuntu 23.04
+ Package: linux-image-6.2.0-20-generic 6.2.0-20.20
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.2.0-20-generic root=UUID=6278216c-6f7c-4a94-8eab-e9c43da65227 ro quiet splash vt.handoff=7
+ ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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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:
  Confirmed

Bug description:
  Repeatedly unusable truncated crash files:

  Bug 2012974, bug 2015842, bug 2015140, bug 2012075