[xrandr]: gnome-settings-daemon crashed with SIGSEGV

[Francois Thirioux]

(Using Gnome shell)

When I hot-plug my hdmi external monitor through mini-DP dongle, my screens are messed up. I can obtain the following config : 2nd monitor and laptop screen cloned. But the other setups fail : 2nd monitor only, extended desktop. When reaching these modes, the laptop screen begins to flicker and if I don't quickly press the screens mode-changing key, the X server (?) ends up to a crash (return to GDM).

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-settings-daemon 3.18.2-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-5.20-generic 4.4.1
Uname: Linux 4.4.0-5-generic x86_64
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Feb 13 09:45:01 2016
ExecutablePath: /usr/lib/gnome-settings-daemon/gnome-settings-daemon
InstallationDate: Installed on 2014-03-05 (709 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
ProcCmdline: /usr/lib/gnome-settings-daemon/gnome-settings-daemon
SegvAnalysis:
 Segfault happened at: 0x7fc4fbba248d: mov (%rax),%r12
 PC (0x7fc4fbba248d) ok
 source "(%rax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%r12" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-settings-daemon
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libgnome-desktop-3.so.12
 ?? () from /usr/lib/x86_64-linux-gnu/libgnome-desktop-3.so.12
 ?? () from /usr/lib/x86_64-linux-gnu/libgnome-desktop-3.so.12
 ?? () from /usr/lib/gnome-settings-daemon-3.0/libxrandr.so
 ?? () from /usr/lib/gnome-settings-daemon-3.0/libxrandr.so
Title: [xrandr]: gnome-settings-daemon crashed with SIGSEGV
UpgradeStatus: Upgraded to xenial on 2015-11-02 (102 days ago)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 real_assign_crtcs (screen=screen@entry=0x885430, outputs=outputs@entry=0x107d190, assignment=assignment@entry=0x9252d0, error=error@entry=0x7ffe61e5b450) at gnome-rr-config.c:941
 crtc_assignment_new (screen=0x885430, outputs=outputs@entry=0x107d190, error=error@entry=0x7ffe61e5b450) at gnome-rr-config.c:1068
 gnome_rr_config_apply_helper (config=config@entry=0x7fc4e801d3b0, screen=<optimized out>, persistent=persistent@entry=0, error=error@entry=0x7ffe61e5b450) at gnome-rr-config.c:628
 gnome_rr_config_apply (config=config@entry=0x7fc4e801d3b0, screen=<optimized out>, error=error@entry=0x7ffe61e5b450) at gnome-rr-config.c:650
 apply_configuration (manager=manager@entry=0x7fc4e4003f00, config=0x7fc4e801d3b0, timestamp=timestamp@entry=3169159) at gsd-xrandr-manager.c:347