LOR: ffs_snapshot.c from 5.2-BETA
Don Lewis
truckman at FreeBSD.org
Thu Dec 11 14:39:27 PST 2003
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.
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