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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - nouveau_fence_wait_uevent NULL pointer dereference"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71620">71620</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>nouveau_fence_wait_uevent NULL pointer dereference
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kdatanasov@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/nouveau
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=89234" name="attach_89234" title="patch_to_protect_fence_channel">attachment 89234</a> <a href="attachment.cgi?id=89234&action=edit" title="patch_to_protect_fence_channel">[details]</a></span>
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</pre>
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