panic: mutex vm object not owned

[Alan Cox]

On Fri, Mar 11, 2005 at 06:59:02PM +0000, Gavin Atkinson wrote:
> 
> Hi,
> 
> I'm tracking RELENG_5 and since my last update I can no longer start X
> without getting the following panic:
> 
> panic: mutex vm object not owned at /usr/src/sys/vm/vm_page.c:334
> cpuid = 0
> KDB: enter: panic
> [ thread pid 2762 tid 100116 ]
> stopped at         kdb_enter+0x2b:   nop
> 
> At which point the machine hangs solid (note this is over a serial console
> - it is after X has claimed the display).
> 
> I've done a binary chop to find where the bug was introduced, and it
> started at some point between 19:00 on 2005/02/25 and 00:00 on 2005/02/26.
> The MFC to vm_page.c which added the assertion I'm tripping up on happened
> between those two points:
> $FreeBSD: src/sys/vm/vm_page.c,v 1.290.2.4 2005/02/25 23:38:22 alc Exp $
> 
> vm_page.c:334 seems to correspond to the line
>     VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
> within vm_page_wakeup()
> 
> Any suggestions?  I'll try to coerce it into generating a backtrace but
> given the machine wedges before even giving the DDB prompt I'm not sure
> I'll be able to.
> 

Are you using an Nvidia driver?

Regards,
Alan