The problem appears to be localized to: nouveau_device_del() So given that and the fact that this is the first time we've ever seen this double-free, it looks very likely to be a bug entirely in the nouveau driver.
** Information type changed from Private to Public ** Also affects: unity-system-compositor Importance: Undecided Status: New ** Also affects: mir Importance: Undecided Status: New ** Also affects: mesa (Ubuntu) Importance: Undecided Status: New ** Summary changed: - unity-system-compositor assert failure: *** Error in `/usr/sbin/unity-system-compositor': double free or corruption (fasttop): 0x00000000017c89a0 *** + unity-system-compositor crashed: double free or corruption in nouveau_device_del ** Changed in: mir Status: New => Incomplete ** Changed in: unity-system-compositor Status: New => Incomplete ** Changed in: unity-system-compositor (Ubuntu) Status: New => Incomplete ** Tags added: nouveau ** Summary changed: - unity-system-compositor crashed: double free or corruption in nouveau_device_del + unity-system-compositor crashed: double free or corruption (fasttop) in nouveau_device_del -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity-system-compositor in Ubuntu. https://bugs.launchpad.net/bugs/1374824 Title: unity-system-compositor crashed: double free or corruption (fasttop) in nouveau_device_del Status in Mir: Incomplete Status in Unity System Compositor: Incomplete Status in “mesa” package in Ubuntu: New Status in “unity-system-compositor” package in Ubuntu: Incomplete Bug description: Ubuntu 14.10 upgraded from 14.04 started ubuntu, saw no unity dash no launcher on left. saw this error reported. I can launch programs via TTY1 etc. ProblemType: Crash DistroRelease: Ubuntu 14.10 Package: unity-system-compositor 0.0.5+14.10.20140917-0ubuntu1 ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3 Uname: Linux 3.16.0-18-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.7-0ubuntu2 Architecture: amd64 AssertionMessage: *** Error in `/usr/sbin/unity-system-compositor': double free or corruption (fasttop): 0x00000000017c89a0 *** Date: Sat Sep 27 14:20:42 2014 ExecutablePath: /usr/sbin/unity-system-compositor GraphicsCard: NVIDIA Corporation GK107M [GeForce GT 750M] [10de:0fe4] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:3802] InstallationDate: Installed on 2014-02-08 (231 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140208) ProcCmdline: /usr/sbin/unity-system-compositor --disable-inactivity-policy=true --file /run/lightdm-mir-0 --from-dm-fd 12 --to-dm-fd 21 --vt 8 --enable-hardware-cursor=true ProcEnviron: Signal: 6 SourcePackage: unity-system-compositor StacktraceTop: __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fc26beb8a40 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175 malloc_printerr (ptr=<optimized out>, str=0x7fc26beb8c08 "double free or corruption (fasttop)", action=1) at malloc.c:4996 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840 ?? () from /usr/lib/x86_64-linux-gnu/gbm/gbm_gallium_drm.so ?? () Title: unity-system-compositor assert failure: *** Error in `/usr/sbin/unity-system-compositor': double free or corruption (fasttop): 0x00000000017c89a0 *** UnitySystemCompositorLog: Warning: ignoring unrecognised arguments: gbm: failed to open any driver (search paths /usr/lib/x86_64-linux-gnu/dri:${ORIGIN}/dri:/usr/lib/dri)failed to load driver: nouveau nvc0_screen_create:652 - Error allocating PGRAPH context for M2MF: -16 UnitySystemCompositorLogOld: Warning: ignoring unrecognised arguments: ERROR: /build/buildd/mir-0.7.3+14.10.20140918.1/src/platform/graphics/mesa/display_helpers.cpp(242): Throw in function int mir::graphics::mesa::helpers::DRMHelper::open_drm_device(const std::shared_ptr<mir::udev::Context>&) Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE std::exception::what: Error opening DRM device 123, "No medium found" UpgradeStatus: Upgraded to utopic on 2014-09-20 (7 days ago) UserGroups: version.libdrm: libdrm2 2.4.56+git20140920.77dce9a0-0ubuntu0ricotz version.lightdm: lightdm 1.11.9-0ubuntu2 version.mesa: libegl1-mesa-dev N/A To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1374824/+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