Date: Fri, 28 Jan 2005 15:51:06 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Brian Fundakowski Feldman <green@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: dump is stuck Message-ID: <40314.1106923866@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 28 Jan 2005 09:47:33 EST." <20050128144733.GA91982@green.homeunix.org>
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In message <20050128144733.GA91982@green.homeunix.org>, Brian Fundakowski Feldman writes: >On Fri, Jan 28, 2005 at 09:08:54AM +0200, Danny Braniss wrote: >> hi, >> while running 'dump 0f - /dist | restore rf -' >> the dump proc. got stuck, it seems it's waiting on some lock: >> >> UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND >> >> 0 30924 30922 0 4 0 3396 2852 sbwait T p1 1:00.88 dump: >> /dev/amrd0s3h: ... >> 0 30925 30924 1 -8 0 3268 2784 physrd TL p1 0:53.84 dump 0f - >> /dist (dump) >> 0 30926 30924 1 20 0 3268 2784 pause T p1 0:53.69 dump 0f - >> /dist (dump) >> 0 30927 30924 1 20 0 3268 2784 pause T p1 0:54.12 dump 0f - >> /dist (dump) >> >> (this is 5.3-STABLE, cvs'ed about a week ago, and it's a SMP system). >> how can i find which lock? or who is holding it? > >Is the one in physrd not actually reading anything from the disk right >now? I would suspect that should be how you really determine if it's >hung or not. You should be able to see how long it's been waiting >and how long it's due to wait still, using kgdb. Check also with gstat(8) if there is I/O activity going on and/or if any I/O requests are stuck. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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