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

syncing disks...


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