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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SIGBUS in EVERGREENUploadToScreen after hibernation (Linux 3.12.4-tuxonice)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72716#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SIGBUS in EVERGREENUploadToScreen after hibernation (Linux 3.12.4-tuxonice)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72716">bug 72716</a>
from <span class="vcard"><a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=72716#c8">comment #8</a>)
<span class="quote">> During the many cycles of “printk, compile, reboot, suspend, resume, crash
> X” I’ve found that the problem may have to do with the fact that I load
> radeon.ko during my initramfs before attempting resume by echoing into
> /sys/power/resume or /sys/power/tuxonice/do_resume.
>
> If I do *not* load radeon.ko into the “booting” kernel (i.e., the one which
> is then replaced by the “resuming” kernel), I couldn’t reproduce the crash.
> Furthermore, I do *not* get these four messages from the “resuming” kernel
> about a lockup:
>
> [ 864.574325] radeon 0000:01:00.0: GPU lockup CP stall for more than
> 10000msec
> [ 864.574328] radeon 0000:01:00.0: GPU lockup (waiting for
> 0x0000000000000004 last fence id 0x0000000000000002)
> [ 864.574331] [drm:uvd_v1_0_ib_test] *ERROR* radeon: fence wait failed
> (-35).
> [ 864.574334] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB
> on ring 5 (-35).</span >
I think what's happening is that when you get the GPU lockup, the driver can't
reset the GPU properly so it has no way to migrate data from non-CPU accessible
vram to CPU accessible vram and you end up with the SIGBUS when the CPU tries
to access the non-CPU accessible vram.
I'm not quite following what you mean by booting vs. resuming kernel.</pre>
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