Re: Deadlock while testing on a 64 MB filesystem

On Monday 23 October 2006 04:48, Peter Holm wrote:
> After some prodding by phk_at_ I made a test for problems seen with
> "newfs -b 32768 -f 4096".
> 
> http://people.freebsd.org/~pho/stress/log/cons218.html
> 
> I was using these watchdog options:  -t 900 -e 'ls /tmp /dev
> /mnt > /dev/null; true' -s 60 and /mnt was the mount point for the test
> filesystem.

Looks like the root is held by 97785:

0xc61292a0: tag ufs, type VDIR
    usecount 35, writecount 0, refcount 39 mountedhere 0
    flags (VV_ROOT)
    v_object 0xc5c2f9d8 ref 0 pages 1
     lock type ufs: EXCL (count 1) by thread 0xc47ea6c0 (pid 97785) with 12 
pending

And it is blocked on another lockmgr lock:

97785   997 97785  1001  S+      getblk   0xd7f43588 ls

lockmgr(d7f43588,202122,c6129368,c47ea6c0) at lockmgr+0x46e
getblk(c61292a0,0,0,1000,0,...) at getblk+0x12f
breadn(c61292a0,0,0,1000,0,...) at breadn+0x2f
bread(c61292a0,0,0,1000,0,...) at bread+0x20
ffs_read(e69f7bac) at ffs_read+0x23f

Can you find the bp in getblk and print out the associated lock?  I'm guessing 
it's share locked by someone else?

-- 
John Baldwin