gnome-shell crashed with SIGSEGV in magazine_chain_pop_head()

[Joe Barnett]

got this crash around the same time as an automount notification -- using fglrx 11.9 drivers

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gnome-shell 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Tue Oct 4 13:13:39 2011
ExecutablePath: /usr/bin/gnome-shell
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f1b8ec380a8 <g_slice_alloc+280>: mov 0x8(%rax),%rbx
 PC (0x7f1b8ec380a8) ok
 source "0x8(%rax)" (0x407855008) not located in a known VMA region (needed readable region)!
 destination "%rbx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 magazine_chain_pop_head (magazine_chunks=0x19bfb70) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:488
 thread_memory_magazine1_alloc (ix=<optimized out>, tmem=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:795
 g_slice_alloc (mem_size=104) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:833
 pango_layout_get_iter () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
 cogl_pango_ensure_glyph_cache_for_layout () from /usr/lib/x86_64-linux-gnu/libcogl-pango.so.0
Title: gnome-shell crashed with SIGSEGV in magazine_chain_pop_head()
UpgradeStatus: Upgraded to oneiric on 2011-07-13 (83 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare sudo vboxusers

[Apport retracing service (apport)]

StacktraceTop:
 magazine_chain_pop_head (magazine_chunks=0x19bfb70) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:488
 thread_memory_magazine1_alloc (ix=<optimized out>, tmem=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:795
 g_slice_alloc (mem_size=104) at /build/buildd/glib2.0-2.30.0/./glib/gslice.c:833
 pango_layout_get_iter (layout=0x3443b80) at /build/buildd/pango1.0-1.29.3+git20110916/./pango/pango-layout.c:5534
 cogl_pango_ensure_glyph_cache_for_layout (layout=0x3443b80) at cogl-pango-render.c:619

[Joe Barnett (thejoe)]

got this again today, using open source ati drivers. resumed from suspend, then tried to switch virtual desktops via ctrl+alt+down and got the crash

[Derek (bugs-m8y)]

So. I'm getting gnome-shell crashing quite a lot, like, once every 5 minutes or so.
I haven't added any debug symbols yet, but I ran into your bug while looking for pango_layout_get_iter which is apparently where I'm crashing.
http://m8y.org/tmp/gnome-shell-fail.txt

#0 0x00007f9e384430a8 in g_slice_alloc () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1 0x00007f9e339b8d2a in pango_layout_get_iter () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
#2 0x00007f9e31252a11 in cogl_pango_ensure_glyph_cache_for_layout () from /usr/lib/x86_64-linux-gnu/libcogl-pango.so.0

Since those 3 match, I'm hoping problem is same.
Also on ATI - using fglrx 8.90.5

[Derek (bugs-m8y)]

FWIW, I added a few more debug symbols and now have:
http://m8y.org/tmp/gnome-shell-crashes/

#0 0x00007fd53d2560a8 in g_slice_alloc () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1 0x00007fd5387cbd2a in pango_layout_get_iter () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
#2 0x00007fd536065a11 in cogl_pango_ensure_glyph_cache_for_layout (layout=0x2b0ba10) at cogl-pango-render.c:619
#3 0x00007fd53e3694e8 in clutter_text_create_layout (text=0x0, allocation_width=-1, allocation_height=1.86805797e-35) at ./clutter-text.c:785
#4 0x00007fd53e3699ce in clutter_text_get_preferred_width (self=<optimized out>, for_height=<optimized out>, min_width_p=0x7fffd14a7bc8, natural_width_p=0x7fffd14a7bcc) at ./clutter-text.c:2279
#5 0x00007fd53e2fe459 in clutter_actor_get_preferred_width (self=0x3e53000, for_height=-1, min_width_p=0x7fffd14a7c58, natural_width_p=0x7fffd14a7c5c) at ./clutter-actor.c:5948
#6 0x00007fd53f0e5da8 in ?? () from /usr/lib/gnome-shell/libgnome-shell.so
#7 0x00007fd53e2fe459 in clutter_actor_get_preferred_width (self=0x3e73140, for_height=-1, min_width_p=0x7fffd14a7e00, natural_width_p=0x7fffd14a7e08) at ./clutter-actor.c:5948

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jeremy Bícha (jbicha)]

Thank you for reporting this bug to Ubuntu. Ubuntu 12.04 LTS reached EOL in April.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Please upgrade to Ubuntu 16.04 LTS and re-test. If the bug is still reproducible, increase the verbosity of the steps to recreate it so we can try again.

I apologize that we are not always to respond to bug reports promptly. Do feel free to report any other bugs you may find.