[Bug 2015857] Re: Repeatedly unusable truncated crash files

[Benjamin Drung]

If I kill gnome-shell the crash file is written correctly:

```
$ killall -11 gnome-shell
$ apport-retrace -g /var/crash/_usr_bin_gnome-shell.1000.crash
[...]
[New LWP 7620]
Warnung: Section `.reg-xstate/7229' in core file too small.
Downloading separate debug info for /usr/lib/x86_64-linux-gnu/mutter-12/libmutter-clutter-12.so.0
[...]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal SIGSEGV, Segmentation fault.
Warnung: Section `.reg-xstate/7229' in core file too small.
#0  __pthread_kill_implementation (no_tid=0, signo=11, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
Download failed: Das Argument ist ungültig.  Continuing without source file ./nptl/./nptl/pthread_kill.c.                                                                              
44	./nptl/pthread_kill.c: Datei oder Verzeichnis nicht gefunden.
[Current thread is 1 (Thread 0x7f250baaf600 (LWP 7229))]
(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=11, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=11, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
[...]
```

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https://bugs.launchpad.net/bugs/2015857

Title:
  Repeatedly unusable truncated crash files

Status in apport package in Ubuntu:
  Triaged

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"

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