Nouveau - May 2010 - [Bug 28320] New: Xserver hangs in an infinite loop

https://bugs.freedesktop.org/show_bug.cgi?id=28320

           Summary: Xserver hangs in an infinite loop
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: high
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: pav_s at freenet.de
         QAContact: xorg-team at lists.x.org


"[mi] EQ overflowing. The server is probably stuck in an infinite
loop."

This is the only meaningful explanation I get in Xorg.0.log.old after
restarting the computer (Lenovo Thinkpad T410 @ nVidia NVS 3100M). After
searching on the Internet , I know, that this message is generated by a variety
of bugs, so tell me please, which information you need to locate the bug...

I am running X.Org X Server 1.8.1 on x86_64 Gentoo with kernel 2.6.34 but I
experienced this bug since 2.6.33 (maybe earlier, too). 

[description]
I first thought, that this bug was caused by my composition manager (xcompmgr)
but after disabling it the problem persisted.This bug happens spontaneous  and
completely at random. The Xserver stops redrawing anything but the mouse is
still moving (hwcursor). I could login through ssh  from another computer and
attach  gdb to the server, to find me inside a tight loop in
drmIoctl()@xf86drm.c making ioctl() and getting -1 and  errno==EINTR every
time. After killing and restarting the server I reliably get a hard lock (ssh
server stops answering my requests, kernel hangs).

[This bug happens in standalone and dualhead mode...]

Till now I have not found any way to reliably reproduce this bug.
(I will post some Xserver logs + dmesg soon)

thanks in advance

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https://bugs.freedesktop.org/show_bug.cgi?id=28320

--- Comment #1 from Pavel S. <pav_s at freenet.de> 2010-05-30 04:07:48 PDT
---
Created an attachment (id=35950)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35950)
dmesg - nothing special here

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--- Comment #2 from Pavel S. <pav_s at freenet.de> 2010-05-30 04:08:30 PDT
---
Created an attachment (id=35951)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35951)
 [mi] overflowing...

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--- Comment #3 from Pavel S. <pav_s at freenet.de> 2010-05-30 04:18:53 PDT
---
Created an attachment (id=35953)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35953)
dmesg - this looks pomising...

After killing the server I get some messages in the dmesg, maybe this helps...

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Pavel S. <pav_s at freenet.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35953|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #4 from Pico <picogeyer at gmail.com> 2010-06-08 07:15:11 PDT
---
Created an attachment (id=36145)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=36145)
Gdb backtrace of Xorg

I think I'm having exactly the same issue.
Would this backtrace of Xorg help?

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--- Comment #5 from Matej Cepl <mcepl at redhat.com> 2010-06-15 07:09:29
PDT ---
That " [mi] EQ overflowing" message is completely meaningless. Please,
read
http://marc.info/?l=fedora-devel-list&m=124101535025331&w=2 and then
take a
look at the disaster which happens when people start to file this message as a
bug at https://bugzilla.redhat.com/show_bug.cgi?id=465884. 

Much more interesting is this backtrace:

Backtrace:
[  5443.624] 0: /usr/bin/X (xorg_backtrace+0x28) [0x46c3c8]
[  5443.624] 1: /usr/bin/X (mieqEnqueue+0x1eb) [0x45b21b]
[  5443.624] 2: /usr/bin/X (xf86PostMotionEventP+0xc8) [0x472828]
[  5443.624] 3: /usr/lib64/xorg/modules/input/evdev_drv.so
(0x7f29c6ccc000+0x407f) [0x7f29c6cd007f]
[  5443.625] 4: /usr/bin/X (0x400000+0x6f6d7) [0x46f6d7]
[  5443.625] 5: /usr/bin/X (0x400000+0xf647a) [0x4f647a]
[  5443.625] 6: /lib/libpthread.so.0 (0x7f29ca790000+0xedf0) [0x7f29ca79edf0]
[  5443.625] 7: /lib/libc.so.6 (ioctl+0x7) [0x7f29c8f0bf17]
[  5443.625] 8: /usr/lib/libdrm.so.2 (drmIoctl+0x23) [0x7f29c881eeb3]
[  5443.625] 9: /usr/lib/libdrm.so.2 (drmCommandWrite+0x1b) [0x7f29c881f13b]
[  5443.625] 10: /usr/lib/libdrm_nouveau.so.1 (0x7f29c7741000+0x31ed)
[0x7f29c77441ed]
[  5443.625] 11: /usr/lib/libdrm_nouveau.so.1 (nouveau_bo_map_range+0xff)
[0x7f29c774439f]
[  5443.625] 12: /usr/lib64/xorg/modules/drivers/nouveau_drv.so
(0x7f29c7947000+0x5f5d) [0x7f29c794cf5d]
[  5443.625] 13: /usr/lib64/xorg/modules/libexa.so (0x7f29c70de000+0x4637)
[0x7f29c70e2637]
[  5443.625] 14: /usr/lib64/xorg/modules/libexa.so (0x7f29c70de000+0x74d2)
[0x7f29c70e54d2]
[  5443.625] 15: /usr/lib64/xorg/modules/libexa.so (0x7f29c70de000+0x4817)
[0x7f29c70e2817]
[  5443.625] 16: /usr/bin/X (0x400000+0xb6a3a) [0x4b6a3a]
[  5443.625] 17: /usr/bin/X (ValidateGC+0x24) [0x447b54]
[  5443.625] 18: /usr/bin/X (0x400000+0x14758b) [0x54758b]
[  5443.625] 19: /usr/bin/X (0x400000+0x1476b0) [0x5476b0]
[  5443.625] 20: /usr/bin/X (0x400000+0x149d33) [0x549d33]
[  5443.625] 21: /usr/bin/X (ConfigureWindow+0xb22) [0x42a302]
[  5443.625] 22: /usr/bin/X (0x400000+0x378d7) [0x4378d7]
[  5443.625] 23: /usr/bin/X (0x400000+0x3830c) [0x43830c]
[  5443.625] 24: /usr/bin/X (0x400000+0x24de5) [0x424de5]
[  5443.625] 25: /lib/libc.so.6 (__libc_start_main+0xe6) [0x7f29c8e61a26]
[  5443.625] 26: /usr/bin/X (0x400000+0x24999) [0x424999]

Looks like a crash in libdrm (or maybe nouveau driver) to me.

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--- Comment #6 from Pavel S. <pav_s at freenet.de> 2010-06-15 07:22:34 PDT
---
(In reply to comment #5)
> That " [mi] EQ overflowing" message is completely meaningless.
Please, read
> http://marc.info/?l=fedora-devel-list&m=124101535025331&w=2 and
then take a
> look at the disaster which happens when people start to file this message
as a
> bug at https://bugzilla.redhat.com/show_bug.cgi?id=465884. 
Yes, I knew this, that ist why I looked into the GDB where the server was
hanging. I am not experienced with X debugging to understand this bug though,
so I decided to ask here.
> Much more interesting is this backtrace:
It looks to me that the server causes an deadlock in the kernel, and after that
it hopelessly hangs in that tight loop trying to get a response from the
kernel....

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Marcin Ko?cielnicki <koriakin at 0x04.net> changed:

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

--- Comment #7 from Marcin Ko?cielnicki <koriakin at 0x04.net> 2010-06-16
12:59:17 PDT ---
The famous Mysterious NVA3-NVA8 Hang.

*** This bug has been marked as a duplicate of bug 26980 ***

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