Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain"

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 06/30/04

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    To: freebsd-current@FreeBSD.org
Date: Tue, 29 Jun 2004 21:28:44 -0400

    On Tuesday 29 June 2004 03:31 pm, Daniel Lang wrote:
    > Hi again,
    >
    > I installed gdb6 from ports, which works.
    > It just confirms the addr2line result:
    >
    > (kgdb) l *0xc053932b
    > 0xc053932b is in witness_checkorder (/usr/src/sys/kern/subr_witness.c:898).
    >
    >
    > Brian Fundakowski Feldman wrote on Tue, Jun 29, 2004 at 02:49:46PM -0400:
    > [..]
    >
    > > > (What hurts most, is, that in one occasion I had a ddb prompt
    > > > and could call doadump() successfully. But after reboot, damn
    > > > /var was full, so savecore could not write it to disk, argl!).
    > >
    > > You can make /var/crash a symlink to a directory with more space.
    >
    > Yes, I usually have enough space there. It was an ill coincidence. :-/
    >
    > Don:
    > Thanks for the hint to run savecore later on. I should have guessed
    > as long as there is not much going on and swap did not need to used
    > yet, I would have gotten a good core. Unfortunately it is to late
    > for now. I'll keep it in mind, though.
    >
    > John:
    > Ok, mutex/witness confusion is maybe going on. How would you suggest
    > to proceed. I am a little reluctant to boot the machine to multi-user
    > and wait for the next crash (which most of the time does not
    > produce a dump or ddb prompt), since I would have to hit the
    > reset button and right now, I'm at home now and have only remote
    > access.

    Unfortunately, I don't have any good ideas off the top of my head. If you
    have a crashdump and a working gdb binary of some sort then you can try
    looking at the sleepq_chains[] hash table in the core file to look for a
    mutex that is corrupted. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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