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

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 06/29/04

  • Next message: John Baldwin: "Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain"" 
    To: freebsd-current@FreeBSD.org
Date: Tue, 29 Jun 2004 14:51:56 -0400

    On Tuesday 29 June 2004 12:30 pm, Daniel Lang wrote:
    > Hi,
    >
    > [ I removed PR-audit address and Bjoern, continue on -current ]
    >
    > John Baldwin wrote on Tue, Jun 29, 2004 at 12:00:12PM -0400:
    > > > LOR2:
    > > > [..]
    > > > acquiring duplicate lock of same type: "sleepq chain"
    > > > 1st Giant @ /usr/src/sys/kern/uipc_syscalls.c:1735
    > > > 2nd sleepq chain @ /usr/src/sys/kern/subr_sleepqueue.c:223
    > >
    > > This message makes no sense at all as they aren't the same type.
    >
    > Well, I did not invent it :-/ I copy/pasted from the serial
    > console of the machine.
    >
    > > > And here the panic message:
    > > > [..]
    > > > Fatal trap 12: page fault while in kernel mode
    > > > cpuid = 1; apic id = 06
    > > > fault virtual address = 0x34
    > > > fault code = supervisor read, page not present
    > > > instruction pointer = 0x8:0xc053932b
    > > > stack pointer = 0x10:0xe53d8ab0
    > > > frame pointer = 0x10:0xe53d8ad4
    > > > code segment = base 0x0, limit 0xfffff, type 0x1b
    > > > = DPL 0, pres 1, def32 1, gran 1
    > > > processor eflags = resume, IOPL = 0
    > > > current process = 2550 (cvsupd)
    > > > [..]
    > > >
    > > > No ddb prompt, no crash-dump, no reboot. I need to go and
    > > > reset the thing (now for the dozenth time :-/).
    > >
    > > Can you pop up gdb -k on the kernel.debug and do 'l *0xc053932b'
    >
    > Ahh, so stupid, I was close.
    >
    > Colin: I missed '-k', so forget my private reply.
    >
    > But however it is futile, since the -current gdb (6.1.1) does
    > not allow -k. I've read on the list, that there is work in
    > progress right now.

    Ah, yes. You can use addr2line to get the address. Something like:

    % addr2line -e kernel.debug -f 0xc053932b 

    -- 
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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