Nouveau - Aug 2007 - [Bug 11820] New: two mplayers using Xv make DMA queue hang

http://bugs.freedesktop.org/show_bug.cgi?id=11820

           Summary: two mplayers using Xv make DMA queue hang
           Product: DRI
           Version: DRI CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM modules
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: pq at iki.fi
         QAContact: xorg-team at lists.x.org


Starting two mplayers showing video at the same time, both using Xv output,
makes eventually (withing about 15 minutes) the DMA queue hang.

First I bisected DDX and found the commit
e0e90f427581929fd01c96f1958a1292982dee83 "nouveau: rip out card init,
everything except modesetting." to be the first bad commit. Before this the
hang does not seem to happen. However, this and the previous commit both bumped
the patchlevel, so I started to bisect DRM.

Bisecting DRM found good and bad commits, all when using the forementioned DDX
commit. The first bad DRM commit is 5f05cd7086c54bccf1c2f0b003b78a08dc55472a
"nouveau: NV04/NV10/NV20 PGRAPH engtab functions". Commits before that
work
fine.

The following is an excerpt from Xorg log:
(II) NOUVEAU(0): Fifo dump (lockup 0x004b,0x004b):
(II) NOUVEAU(0): [0x0037] 0x00230001
(II) NOUVEAU(0): [0x0038] 0x022002d0
(II) NOUVEAU(0): [0x0039] 0x00100000
(II) NOUVEAU(0): [0x003a] 0x00100000
(II) NOUVEAU(0): [0x003b] 0x00104400
(II) NOUVEAU(0): [0x003c] 0x022002d0
(II) NOUVEAU(0): [0x003d] 0x010105c0
(II) NOUVEAU(0): [0x003e] 0x0419b000
(II) NOUVEAU(0): [0x003f] 0x00000000
(II) NOUVEAU(0): [0x0040] 0x0004a2fc
(II) NOUVEAU(0): [0x0041] 0x00000003
(II) NOUVEAU(0): [0x0042] 0x00100300
(II) NOUVEAU(0): [0x0043] 0x0000000a
(II) NOUVEAU(0): [0x0044] 0x140007c0
(II) NOUVEAU(0): [0x0045] 0x00520700
(II) NOUVEAU(0): [0x0046] 0x00000000
(II) NOUVEAU(0): [0x0047] 0x000ca300
(II) NOUVEAU(0): [0x0048] 0x012d0104
(II) NOUVEAU(0): [0x0049] 0x03d20105
(II) NOUVEAU(0): [0x004a] 0x000f0006
(II) NOUVEAU(0): [0x004b] 0x00000005
(II) NOUVEAU(0): [0x004c] 0x00000003
(II) NOUVEAU(0): [0x004d] 0x000423fc
(II) NOUVEAU(0): [0x004e] 0x00000000
(II) NOUVEAU(0): [0x004f] 0x00184308
(II) NOUVEAU(0): [0x0050] 0x00230001
(II) NOUVEAU(0): [0x0051] 0x022002d0
(II) NOUVEAU(0): [0x0052] 0x00230001
(II) NOUVEAU(0): [0x0053] 0x022002d0
(II) NOUVEAU(0): [0x0054] 0x00100000
(II) NOUVEAU(0): End of fifo dump

Fatal server error:
DMA queue hang: dmaPut=4b, current=4b, status=1


This is NV28, running on a fully 64-bit Gentoo Linux.


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http://bugs.freedesktop.org/show_bug.cgi?id=11820





------- Comment #1 from pq at iki.fi  2007-08-03 10:05 PST -------
Today I confirmed. DDX using commit e0e90f427581929fd01c96f1958a1292982dee83.

I ran DRM commit 5f05cd7086c54bccf1c2f0b003b78a08dc55472a and two mplayers
triggered DMA queue hang almost immediately after starting.

I ran DRM commit 5d55b0655cb480b7d6ab4cf2467dac6dc6d8df25 which is the one just
before, and the full one hour video played through without crashes.


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http://bugs.freedesktop.org/show_bug.cgi?id=11820


pq at iki.fi changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




------- Comment #2 from pq at iki.fi  2007-08-11 02:37 PST -------
Yesterday I ran tvtime and mplayer together for an hour and no crash. Therefore
I'm closing this bug as fixed, for now. I don't know which commit fixed
things.

btw. I did notice that running two mplayers and tvtime (i.e. three Xv apps) at
the same time does trigger a similar crash, but at this point I do not think it
matters.


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