[Nouveau] [Bug 71620] New: nouveau_fence_wait_uevent NULL pointer dereference

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71620

          Priority: medium
            Bug ID: 71620
          Assignee: nouveau at lists.freedesktop.org
           Summary: nouveau_fence_wait_uevent NULL pointer dereference
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kdatanasov at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/nouveau
           Product: Mesa

Created attachment 89234
  --> https://bugs.freedesktop.org/attachment.cgi?id=89234&action=edit
patch_to_protect_fence_channel

Upon normal computer operation user session(GNOME-Shell) sometimes will just
terminate. Problem seems more common if two users are logged in(GNOME-Shell)
for a day.

GPU:
NVIDIA Corporation C77 [GeForce 8300] (rev a2)

kernel version:
3.12.0-upstream

Relevent dmesg output:
[29434.602169] Call Trace:
[29434.602188]  [<ffffffffa010b6db>] ?
nouveau_fence_wait_uevent.isra.1+0x1b/0x3f0 [nouveau]
[29434.602208]  [<ffffffffa010b676>] ? nouveau_fence_update+0x76/0x90 [nouveau]
[29434.602228]  [<ffffffffa010bb36>] nouveau_fence_wait+0x86/0x1a0 [nouveau]
[29434.602248]  [<ffffffffa010d7a5>] nouveau_bo_fence_wait+0x15/0x20 [nouveau]
[29434.602260]  [<ffffffffa00658a1>] ttm_bo_wait+0x91/0x190 [ttm]
[29434.602279]  [<ffffffffa0112e57>] nouveau_gem_ioctl_cpu_prep+0x57/0xe0
[nouveau]
[29434.602294]  [<ffffffffa0010c52>] drm_ioctl+0x502/0x630 [drm]
[29434.602313]  [<ffffffffa0108d11>] nouveau_drm_ioctl+0x51/0x90 [nouveau]
[29434.602324]  [<ffffffff811b3690>] do_vfs_ioctl+0x2e0/0x4c0
[29434.602332]  [<ffffffff811a2e2e>] ? ____fput+0xe/0x10
[29434.602340]  [<ffffffff81080544>] ? task_work_run+0xa4/0xe0
[29434.602347]  [<ffffffff811b38f1>] SyS_ioctl+0x81/0xa0
[29434.602356]  [<ffffffff814f81ad>] system_call_fastpath+0x1a/0x1f
[29434.602364] Code: c3 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 e5 41
57 49 89 f7 41 56 41 55 41 54 41 89 d4 53 48 89 fb 48 83 ec 58 48 8b 07 <48> 8b
48 08 48 8b 91 f8 00 00 00 4c 8b b1 b0 07 00 00 48 8b 42 

I'm trying some change(adding it as patch) - no problem so far, but since I
have zero experience in kernel/driver workflow definitely not sure if it's OK.

Regards, K

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