Sleeping on "itrmh" with the following non-sleepable locks held:

Hello,

I managed to get the following printed on a serial console while shutting 
down XFree86 today:

Sleeping on "itrmh" with the following non-sleepable locks held:
exclusive sleep mutex drm device r = 0 (0x6505f464) locked _at_ 
dev/drm/drm_irq.h:192
Stack backtrace:
backtrace(607dd224,b00c894c,1,6599e6e0,65945d20) at 0x60564407
witness_warn(5,64faf380,60735d8f,60732f57,15a) at 0x605893f3
msleep(65777b40,64faf380,a0,60732f57,0) at 0x6056b98a
ithread_remove_handler(65777b40,b00c89bc,606e4ad1,65777b40,b00c89e4) at 
0x6054d695

I had DRM_DEBUG turned on and a console actively logging at the time, so I 
was able to produce a full trace with the DRM_DEBUG messages before and 
after. I have attached the file to this email.

My kernel is fairly stock, with amr, nge, smp and DRM_DEBUG enabled. I can 
make my config file available as well as the full hardware specifications 
for the machine that this was found on. Google turned up something similar 
from last December, involving the same line of code, but it was a LOR. 
That report can be found here: 
http://lists.freebsd.org/pipermail/freebsd-current/2003-December/015540.html

Any ideas?
Andy

> Andre Guibert de Bruet | Enterprise Software Consultant >
> Silicon Landmark, LLC. | http://siliconlandmark.com/    >