Date: Wed, 25 Oct 2006 15:45:52 -0400 From: John Baldwin <jhb@freebsd.org> To: Peter Holm <peter@holm.cc> Cc: freebsd-current@freebsd.org Subject: Re: Deadlock while testing on a 64 MB filesystem Message-ID: <200610251545.53454.jhb@freebsd.org> In-Reply-To: <20061025192238.GA25846@peter.osted.lan> References: <20061023084839.GA4523@peter.osted.lan> <200610251333.42114.jhb@freebsd.org> <20061025192238.GA25846@peter.osted.lan>
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On Wednesday 25 October 2006 15:22, Peter Holm wrote: > 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@ 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. Ah, it's got one of those "bogus" owners: lk_lockholder = 0xfffffffe aka LK_KERNPROC. I don't grok enough buf/bio stuff to dive into this further. Maybe phk (cc'd) can help. -- John Baldwin
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