Re: panic in propagate_priority w/ postgresql under heavy load

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 09/02/05

  • Next message: Vladimir Kushnir: "libmap.conf: mapping directories?" 
    To: freebsd-hackers@freebsd.org
Date: Fri, 2 Sep 2005 14:09:24 -0400

    On Thursday 01 September 2005 06:04 pm, Koen Martens wrote:
    > John Baldwin wrote:
    > > On Thursday 01 September 2005 01:02 pm, Koen Martens wrote:
    > >>I've had a little chat with neologism on ircnet/#freebsd about this
    > >>already, and done as he suggested: compile a debug kernel to obtain
    > >>a stack trace.
    > >
    > > Can you reproduce it with a kernel that has INVARIANTS and
    > > INVARIANT_SUPPORT on? I see that you had WITNESS on, can you check to
    > > see if there were any witness messages about sleepign with non-sleepable
    > > locks held before the crash?
    >
    > I will do this when I get back. I did a grep -i on witness in the
    > console log but this did not turn up anything suspicious (exact
    > output pasted below). Also, i checked again the logs right before
    > the crashes, nothing special output to console before the Kernel
    > trap 12..
    >
    >
    > voltaire# grep -i witness yin.log
    > WARNING: WITNESS option enabled, expect reduced performance.
    > witness_get: witness exhausted
    > WARNING: WITNESS option enabled, expect reduced performance.
    > witness_get: witness exhausted

    This last means that witness had turned itself off because it had run out of
    resources. Try bumping up the WITNESS_COUNT constant in
    sys/kern/subr_witness.c. 

    -- 
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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