Date: Fri, 20 May 2005 08:25:58 -0600 From: "Elliot Finley" <efinleywork@efinley.com> To: "Peter Jeremy" <PeterJeremy@optushome.com.au> Cc: sos@freebsd.org Subject: Re: 5.4-RC2 freezing - ATA related? Message-ID: <08dc01c55d47$d7697100$37cba1cd@emerytelcom.com> References: <001801c55a14$609720d0$37cba1cd@emerytelcom.com> <20050516195859.GA59189@server.vk2pj.dyndns.org> <042501c55ba7$360fac30$37cba1cd@emerytelcom.com> <20050518194356.GA2129@cirb503493.alcatel.com.au>
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From: "Peter Jeremy" <PeterJeremy@optushome.com.au> > On Wed, 2005-May-18 06:43:37 -0600, Elliot Finley wrote: > >Had the system lock up again. This is with the new ATA mkIII patches on > >http://people.freebsd.org/~sos/ATA. > > > >I didn't get the crashdump (forgot to set dumpdev), but I did get 'ps' and > >'show lockedvnods' output from DDB. The output is in the form of > >screenshots combined into a single .pdf which can be accessed here > >http://www.efinley.com/Binder1.pdf > > That shows a deadlock-to-root in your /dev/ar0s1a (presumably root) > filesystem. The perl process (pid 487) has an exclusive lock on > the FS mountpoint - this is blocking 130 other processes. Pid 487 > is itself waiting on another filesystem lock (you can't determine > the actual lock tree without more poking around kernel memory). > > The vnode locks are held by processes: > PID name waiting on > 487 perl [ufs c3c1c1b4] > 57 syncer [snaplk c535f500] (holds 2 locks) > 476 perl [ufs c87e4f1c] > 489 perl [snaplk c535f500] (holds 2 locks) > 3337 mksnap_ffs [getblk d77656f4] > > Looking through the process list, cron has started a "dump -L" which > is trying to create a filesystem snapshot. That has wedged on > "getblk" (trying to perform physical disk I/O) and is probably the > root of your problem. Nothing else is waiting on physical I/O. > > I'd say that your first guess was right: This is a bug in the ATA > code and is probably a job for sos. I took the -L option off of my dump command in my daily dump script. I've gone two days without locking up which is unusual. I think that may be what was tickling the bug that was locking me up. Thanks for the analysis Peter. Elliot
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