LOR: ffs_snapshot.c from 5.2-BETA

[Jesse Guardiani]

Don Lewis wrote:

> On 11 Dec, Jesse Guardiani wrote:
>> Don Lewis wrote:
>> 
>>> On  9 Dec, Jesse Guardiani wrote:
>>>> Howdy list,
>>>> 
>>>> Has anyone seen this yet? Happened while I was fsck'ing my
>>>> external USB hard drive a few days ago. Didn't see anything
>>>> recent like this in the archive (Nov was the closest, but it
>>>> looked like a separate issue).
>>>> 
>>>> 
>>>> acquiring duplicate lock of same type: "vnode interlock"
>>>>  1st vnode interlock @ ufs/ffs/ffs_snapshot.c:488
>>>>  2nd vnode interlock @ ufs/ffs/ffs_snapshot.c:491
>>>> Stack backtrace:
>>>> backtrace(c06df4ef,c06e3b95,c06eca1f,1eb,246) at backtrace+0x17
>>>> witness_lock(c42b9a28,8,c06eca1f,1eb,c3b48678) at witness_lock+0x672
>>>> _mtx_lock_flags(c42b9a28,0,c06eca16,1eb,c19dbf00) at
>>>> _mtx_lock_flags+0xba
>>>> ffs_snapshot(c3abbc00,bfbfed88,70,c05482f3,c073f800) at
>>>> ffs_snapshot+0x1759
>>> 
>>> A related LOR was reported a few days ago.  I think it is harmless, but
>>> I also think I know how to fix it.
>> 
>> Going once... Going twice...
> 
> It's more complicated that I thought at first.  I hoping to have some
> time to work on it over the holidays.

Well at least you understand the problem and are willing to work on it. :)
I'm thread ignorant. Hopefully one of my relatives will buy me "Programming
with POSIX Threads" by David R. Butenhof, for Christmas so I can stop
feeling so useless. :)

-- 
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v)  423-559-5145 (f)
http://www.wingnet.net