Re: Deadlock while testing on a 64 MB filesystem

On Wed, Oct 25, 2006 at 01:33:41PM -0400, John Baldwin wrote:
> 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?
> 

I have updated cons218 with what I hope is the requested info.

- Peter

> -- 
> John Baldwin