Re: Help with issue with mpt(4) driver

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Mon, 21 Jan 2013, Patrick Welche wrote:

> I have just been experiencing filesystem lock-up with a process in
> uvn_fp2, so it may be unrelated to you mpt fiddling... That systems
> disks are on ahcisata.
> 
> It can withstand builds of the world, but not GraphicsMagick:
> 
> struct proc *  ffff fe81 4c8c 1d10
> uarea *        ffff fe81 3d6d 5d80
> vmspace/vm_map ffff fe81 0f23 2470
> 
> PID   LID S CPU     FLAGS       STRUCT LWP *   NAME WAIT
> 917     4 3   1  10000080   fffffe8147dac180     gm psem
> 917     3 3   2        80   fffffe8147dac5a0     gm psem
> 917     2 3   3  10000080   fffffe8147dac9c0     gm psem
> 917     1 3   4  10000000   fffffe813b57e160     gm uvn_fp2
> 
> wmesg psem wchan fffffe81106a1658
> 
> lwp 1 fffffe813b57e160 pcb fffffe813d6c9d80
>   stat 3 flags 10000000 cpu 1 pri 43
>   wmesg uvn_fp2 wchan ffff8000003e33f8
> 
> ? VNODE flags 0x30<MPSAFE,LOCKSWORK>
> v_lock ffff fe81 1427 0280
> 
> but I'm not sure what to look for...

Grab the wchan for the thread waiting in uvn_fp2 and dump it as a 
vm_page_t.  

Eduardo