John Baldwin wrote:
> 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...
>
> Got a backtrace? What is really annoying is that preemption has been in the
> kernel since Feb 1. I just accidentally turned it off in the ithread code
> reorganization and then turned it back on. It was off for a few hours after
> only being on for 2 weeks, and now everyone magically has problems.
Here it is (from DDB):
panic(c027de93,c0297409,c027f878,368,80286)
_mtx_assert(c02ea000,9,c027f878,368,80286)
mi_switch(c32c5da0,3,c02cea44,c357be98)
ithread_schedule(c0747c00,1)
sched_ithd(e)
Xresume14()
--- interrupt, eip = 0xc025b60f, esp = 0x80296, ebp = 0xc357bf08 ---
trap(18, 10, 10,c01597b6,20)
calltrap()
--- trap 0x9, eip = 0xc025a5de, esp = 0xc357bf50, ebp = 0xc357bf64 ---
sw1b(c0146cbc,c0146cbc,c32c5da0,c357bf94)
ithread_loop(c0747c00,c357bfa8)
fork_exit(c0146cbc,c0747c00,c357bfa8)
fork_trampoline()
-Maxim
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