The crash is occurring in libdrm_nouveau.so.2 which comes from source package `libdrm'. So it seems to be just a nouveau driver crash and not a general Xorg issue.
** Information type changed from Private to Public ** Package changed: xorg-server (Ubuntu) => libdrm (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libdrm in Ubuntu. https://bugs.launchpad.net/bugs/1640457 Title: Xorg assert failure: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed. Status in libdrm package in Ubuntu: New Bug description: I have three options for my video adapter: nvidia-304 (+ nvidia- opencl-icd-304 and nvidia-settings) and xserver-xorg-video-nouveau. If I uninstall both of them (I was forced to do that because xserver- xorg-video-nouveau doesn't work at all and nvidia-304 doesn't work at latest version), system seems to work, but periodically (5 minutes to 1 hour) XOrg crashes. Crashes seem to occur at random points of time (unrelated to my actions), but persistently. 1) lsb_release -rd Description: Ubuntu 16.04.1 LTS Release: 16.04 2) apt-cache policy xorg xserver-xorg-core xorg: Installed: 1:7.7+13ubuntu3 Candidate: 1:7.7+13ubuntu3 Version table: *** 1:7.7+13ubuntu3 500 500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 100 /var/lib/dpkg/status xserver-xorg-core: Installed: 2:1.18.4-0ubuntu0.1 Candidate: 2:1.18.4-0ubuntu0.1 Version table: *** 2:1.18.4-0ubuntu0.1 500 500 http://ua.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 100 /var/lib/dpkg/status 2:1.18.3-1ubuntu2 500 500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 3) I expected XOrg to run stably (or not to run at all if some critical components are missing). 4) It crashes every 5min-1hour. ProblemType: Crash DistroRelease: Ubuntu 16.04 Package: xserver-xorg-core 2:1.18.4-0ubuntu0.1 ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21 Uname: Linux 4.4.0-45-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AssertionMessage: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed. Date: Wed Nov 9 13:20:43 2016 ExecutablePath: /usr/lib/xorg/Xorg ExecutableTimestamp: 1473867446 InstallationDate: Installed on 2015-11-10 (364 days ago) InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151110) ProcCmdline: /usr/lib/xorg/Xorg -nolisten tcp -auth /var/run/sddm/{0f1dcf2c-924d-493a-b72a-0d3865f108e8} -background none -noreset -displayfd 17 vt7 ProcCwd: / Signal: 6 SourcePackage: xorg-server StacktraceTop: __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7fd94a537728 "bkref", file=file@entry=0x7fd94a53770a "../../nouveau/pushbuf.c", line=line@entry=238, function=function@entry=0x7fd94a537768 "pushbuf_krel") at assert.c:92 __GI___assert_fail (assertion=0x7fd94a537728 "bkref", file=0x7fd94a53770a "../../nouveau/pushbuf.c", line=238, function=0x7fd94a537768 "pushbuf_krel") at assert.c:101 ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2 nouveau_pushbuf_reloc () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2 ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so Title: Xorg assert failure: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1640457/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
