On 22-Feb-01 Dag-Erling Smorgrav wrote:
> John Baldwin <[EMAIL PROTECTED]> writes:
>> On 22-Feb-01 Maxim Sobolev wrote:
>> > Dag-Erling Smorgrav wrote:
>> > 
>> >> Maxim Sobolev <[EMAIL PROTECTED]> writes:
>> >> > It's not an ata specific problem, but rather a problem of all ISA
>> >> > devices (I have an ISA based ata controller).
>> >>
>> >> I don't think it has anything to do with ISA. I've had similar
>> >> problems on a PCI-only system (actually, PCI+EISA motherboard with no
>> >> EISA cards) with no ATA devices (disks, CD-ROM and streamer are all
>> >> SCSI).
>> >>
>> >> Considering that backing out rev 1.14 of ithread.c eliminates the
>> >> panics, and that that revision is supposed to enable interrupt thread
>> >> preemption, and that the crashed kernels show signs of stack smashing,
>> >> I'd say the cause is probably a bug in the preemption code.
>> > 
>> > Update: the bug is still here, as of -current from 22 Feb. Hovewer, this
>> > time
>> > it even doesn't let to boot into single-user with following panic message:
>> > kernel trap 12 with interrupts disabled
>> > panic: mutex sched lock recursed at ../../kern/kern_synch.c:872
>> Errrr.  That would be something that is leaking sched_lock.  Hmm...
> I have another sched_lock-related problem which showed up over the
> weekend. Starting StarOffice 5.2 invariably triggers the following
> panic:
> root@aes /var/crash# gdb -k
> sGNU gdb 4.18
> Copyright 1998 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-unknown-freebsd".
> (kgdb) source ~des/kgdb
> (kgdb) kernel 0
> IdlePTD 3526656
> initial pcb at 2cb980
> panicstr: from debugger
> panic messages:
> ---
> panic: mutex sched lock not owned at ../../posix4/ksched.c:215

Easy enough.  It seems I missed adding sched_lock around a need_resched().
I'll fix in a second..

John Baldwin <[EMAIL PROTECTED]> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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