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re: kern/54817: kernel stall in radeon_gem_object_create
The following reply was made to PR kern/54817; it has been noted by GNATS.
From: matthew green <mrg%eterna.com.au@localhost>
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: re: kern/54817: kernel stall in radeon_gem_object_create
Date: Thu, 02 Jan 2020 20:02:49 +1100
Izumi Tsutsui writes:
> Dec 25 02:26:49 mirage /netbsd: [ 4974.8588428] kern error: [drm:(../../=
> ROR* Failed to allocate GEM object (4792320, 2, 4096, -12)
[ ... ] =
> The machine has Radeon HD5450 and it fails to start Xorg,
> so I put the following line in /etc/X11/xorg.conf (see PR/54782):
> >> Option "AccelMethod" "uxa"
hmm. i am using a 5450 without any xorg.conf and it works
mostly fine for me. i wonder what is up with this part.
oh perhaps it is an i386 vs amd64 specific issue. can you
file a differenet PR for this part?
> No idea. Something uses malloc(9) with M_NOWAIT as PR/54796 in audio(9)=
i've been tracking a problem like this down for a few months.
it comes and goes for me, and usually i have to restart X to
recover (there is another one that usually requires a reboot
to get accel back, i haven't managed to get much info about
at all yet.)
for most cases i've seen with my instrumentation, the
ultimate cause is bus_dma eg, my diag patch shows this:
kern error: ttm_bus_dma_populate:82 bus_dmamap_load_pglist failed: -12
is matched with this:
ret =3D -bus_dmamap_load_pglist(ttm_dma->ttm.bdev->dmat,
(ttm_dma->ttm.num_pages << PAGE_SHIFT), BUS_DMA_WAITOK);
if (ret) printk(KERN_ERR "%s:%d bus_dmamap_load_pglist failed: %d\n", __f=
unc__, __LINE__, ret);
as you can see, BUS_DMA_WAITOK is used already.
this isn't the only case i've seen, though. i'm not sure
what is going on, and the other reboot-requiring problem
has been happening more frequently since i got as far as
locating the above.
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