Deadlock in 5.3p5

[Kris Kennaway]

CC'ing to jeffr

On Sat, Apr 16, 2005 at 07:21:29AM +1000, Peter Jeremy wrote:
> My son's computer deadlocked last night.  "show lockedvnods" in DDB showed:
> 
> Locked vnodes
> 0xc1669840: tag ufs, type VDIR, usecount 8, writecount 0, refcount 2, flags (VV_ROOT|VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc18ed000 (pid 9666) with 7 pending
>       ino 2, on dev ad0s1g (4, 25)
> 0xc1682000: tag ufs, type VDIR, usecount 5, writecount 0, refcount 2, flags (VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc16fd000 (pid 15686) with 1 pending
>       ino 23552, on dev ad0s1g (4, 25)
> 0xc1b30d68: tag ufs, type VDIR, usecount 2, writecount 0, refcount 1, flags    (VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc268f000 (pid 9075) with 1 pending
>       ino 122986, on dev ad0s1g (4, 25)
> 0xc1c3c210: tag ufs, type VDIR, usecount 3, writecount 0, refcount 1, flags    (VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc16fe4b0 (pid 9067) with 1 pending
>       ino 142022, on dev ad0s1g (4, 25)
> 0xc1e2ce70: tag ufs, type VREG, usecount 6, writecount 0, refcount 0, flags (VV_OBJBUF), lock type ufs: SHARED (count 1) with 1 pending
>       ino 142169, on dev ad0s1g (4, 25)
> 
> After poking around in the crashdump for a while, I've worked out that
> the process holding each of the above exclusive locks is waiting on
> the next lock in the list.  Unfortunately, there doesn't appear to be
> any way to work out which process is holding the shared lock unless
> DEBUG_LOCKS is set (and even this doesn't work if the lock was implicitly
> downgraded by a process calling lockmgr(LK_SHARED) when it holds an
> exclusive lock).
> 
> FWIW, the affected inodes are:
>      2  /usr
>  23552  /usr/local
> 122986  /usr/local/OpenOffice.org1.1.4
> 142022  /usr/local/OpenOffice.org1.1.4/program
> 142169  /usr/local/OpenOffice.org1.1.4/program/libpsp645fi.so
> 
> Does anyone have any ideas on how to track this further (or so I just
> write it off as a glitch).
> 
> -- 
> Peter Jeremy
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