Public bug reported:
The X server used by FreeNX and X2Go does not support the IDLETIME
counter. This eventually leads to a NULL pointer dereference by gnome-
session due to a missing parameter check in
gnome_idle_monitor_get_idletime. This renders GNOME Flashback unusable
via FreeNX/X2Go in Trusty.
Utopic and newer are not affected and the patch is not applicable as the
GnomeIdleMonitor implementation was rewritten. Saucy is also affected
but is EOL, however I would like to fix this in Trusty as the patch is
tiny and IMO obviously correct.
This and bug #1251281 are the only bugs preventing GNOME Flashback being
used via FreeNX/X2Go in Trusty; and the latter has an easy workaround
(divert the acceleration-check helper and replace it with /bin/true) and
may be fixed properly soon.
I would be happy to prepare a debdiff and fill out the SRU template if a
sponsor agrees that the patch is SRUable.
ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: gnome-session-bin 3.9.90-0ubuntu12 [modified:
usr/lib/gnome-session/gnome-session-check-accelerated
usr/lib/gnome-session/gnome-session-check-accelerated-helper]
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CasperVersion: 1.340
Date: Thu Jan 29 19:28:42 2015
ExecutablePath: /usr/bin/gnome-session
ExecutableTimestamp: 1394758239
LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcCmdline: /usr/bin/gnome-session --session=gnome-flashback
ProcCwd: /home/ubuntu
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
LD_LIBRARY_PATH=<set>
SegvAnalysis:
Segfault happened at: 0x7fb690b29196 <gnome_idle_monitor_get_idletime+6>:
mov 0x18(%rdi),%rax
PC (0x7fb690b29196) ok
source "0x18(%rdi)" (0x00000018) not located in a known VMA region (needed
readable region)!
destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-session
StacktraceTop:
gnome_idle_monitor_get_idletime (monitor=0x0) at gnome-idle-monitor.c:613
reset_idle_watch (presence=0x7fb6780036f0) at gsm-presence.c:196
gsm_presence_set_idle_enabled (presence=0x7fb6780036f0, enabled=1) at
gsm-presence.c:354
start_phase (manager=manager@entry=0x1658100) at gsm-manager.c:1568
end_phase (manager=manager@entry=0x1658100) at gsm-manager.c:580
Title: gnome-session crashed with SIGSEGV in gnome_idle_monitor_get_idletime()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
** Affects: gnome-desktop3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-crash need-amd64-retrace patch trusty
** Attachment added: "validate the argument to gnome_idle_monitor_get_idletime"
https://bugs.launchpad.net/bugs/1416081/+attachment/4308235/+files/get_idletime_check_argument.patch
** Information type changed from Private to Public
** Package changed: gnome-session (Ubuntu) => gnome-desktop3 (Ubuntu)
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https://bugs.launchpad.net/bugs/1416081
Title:
(FreeNX/X2Go) gnome-session crashed with SIGSEGV in
gnome_idle_monitor_get_idletime()
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