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

[Daniel Lang]

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.

I can copy the kernel image to a machine with a older -current
which has working gdb -k. However I do not have the exact
source tree there. I will see if I can check it out though.

I'll get back to you, if I can come up with a line number
that could make sense. Not sure how sensitive it is to
have the "exact" source-tree.

Thanks so far,
 Daniel
-- 
IRCnet: Mr-Spock                      - May His Shadow fall upon thee - 
 Daniel Lang * dl at leo.org * +49 89 289 18532 * http://www.leo.org/~dl/