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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [MCP79][Regression] Unhandled NULL pointer dereference in nvkm_object_unmap since kernel 4.15"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105173#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [MCP79][Regression] Unhandled NULL pointer dereference in nvkm_object_unmap since kernel 4.15"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105173">bug 105173</a>
from <span class="vcard"><a class="email" href="mailto:nvlbox@gmail.com" title="Nick Lee <nvlbox@gmail.com>"> <span class="fn">Nick Lee</span></a>
</span></b>
<pre>(In reply to Pierre Moreau from <a href="show_bug.cgi?id=105173#c10">comment #10</a>)
<span class="quote">> What exactly is reproducible? The artefacts I would assume, but which error
> exactly? The NULL pointer dereference, or the “trapped read at 0080000000 on
> channel 1 [0fbb0000 DRM] engine 00 [PGRAPH] client 03 [DISPATCH] subclient
> 04 [M2M_IN] reason 00000006 [NULL_DMAOBJ]” one?
> I did manage to reproduce the second one with Wayland, but still no luck
> with the first one.</span >
This error:
[ 372.954548] nouveau 0000:03:00.0: imem: OOM: 00100000 00001000 -28
[ 372.954702] nouveau 0000:03:00.0: gr: TRAP_M2MF 00000002 [IN]
[ 372.954712] nouveau 0000:03:00.0: gr: TRAP_M2MF 00320951 c0001fc0 00000000
04000430
[ 372.954722] nouveau 0000:03:00.0: gr: 00200000 [] ch 1 [000fbb0000 DRM] subc
4 class 5039 mthd 0100 data 00000000
[ 372.954752] nouveau 0000:03:00.0: fb: trapped read at 00c0000000 on channel
1 [0fbb0000 DRM] engine 00 [PGRAPH] client 03 [DISPATCH] subclient 04 [M2M_IN]
reason 00000000 [PT_NOT_PRESENT]
kernel-4.15.6-300.vanilla.knurd.1.fc27.x86_64
mesa-17.3.6
Screenshot:
<a href="https://s9.postimg.org/hajle1skf/Screenshot_from_2018-03-01_10-12-28.png">https://s9.postimg.org/hajle1skf/Screenshot_from_2018-03-01_10-12-28.png</a>
<span class="quote">> (In reply to Nick Lee from <a href="show_bug.cgi?id=105173#c8">comment #8</a>)
> > Fedora-Workstation-Live-x86_64-Rawhide-20180220.n.0.iso
> > wayland session
> >
> > [ 1035.437016] nouveau 0000:03:00.0: swiotlb buffer is full (sz: 2097152
>
> I’ll try the iso. Did you get this error with supertuxkart as well, or
> simply by launching the session?
> </span >
by launching the session</pre>
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