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

From: Brian Fundakowski Feldman (green_at_FreeBSD.org)
Date: 06/29/04

  • Next message: John Baldwin: "Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain"" 
    Date: Tue, 29 Jun 2004 14:49:46 -0400
To: Daniel Lang <dl@leo.org>

    On Tue, Jun 29, 2004 at 08:35:57PM +0200, Daniel Lang wrote:
    > Hi Brian,
    >
    > Brian Fundakowski Feldman wrote on Tue, Jun 29, 2004 at 01:00:14PM -0400:
    > [..]
    > > You can find it out without using gdb, too. This will work for
    > > only main kernel symbols, but you can do something similar for
    > > KLDs. Say I want to find a symbol that's in the main kernel object:
    > >
    > > $ objdump -t /boot/kernel/kernel | ruby -ne 'fields = $_.split; if fields[3] == ".text" and fields[2] == "F" and 0xc048a800.between?(fields[0].hex, fields[0].hex + fields[4].hex) then puts $_ end'
    > > c048a7ac l F .text 0000006b cbb_removal
    > [..]
    >
    > Thanks for that hint, but Colin suggested to use "addr2line", which
    > produced some result. Maybe addr2line does a similar thing
    > as your objdump/ruby script:

    Yeah, as long as it's in the main kernel object and you have debug
    symbols.

    > So I have a line of code for the failing address:
    >
    > # addr2line -e kernel.debug 0xc053932b
    > /usr/src/sys/kern/subr_witness.c:898
    >
    > which is (in my kernel):
    >
    > [..]
    > lock1 = &(*lock_list)->ll_children[(*lock_list)->ll_count - 1];
    > [..]
    >
    > Well, I'm not sure if this is a big help. I doubt there is a bug
    > in witness code.

    Looks like a lock was cleared out/freed/whatever but not actually
    deinitialized first?

    > I'll cross-check with gdb to see if there is the same
    > result. Too bad I couldn't get a crashdump.
    >
    > (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. 

    -- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\
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  • Next message: John Baldwin: "Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain""

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