PREEMPTION vs ndisulator
Andrew Gallatin
gallatin at cs.duke.edu
Fri Dec 16 14:12:28 PST 2005
John Baldwin writes:
> On Friday 16 December 2005 03:52 pm, Andrew Gallatin wrote:
> > John Baldwin writes:
> > > On Friday 16 December 2005 11:34 am, Andrew Gallatin wrote:
> > > Looks like an ithread has preempted your driver's start routine. If you
> > > let it run some more and then break into ddb is the same thread (pid 11)
> > > still running? Also, which process is pid 11?
It looks like the ithread is looping:
db> show intrcnt
irq4: sio0 1007
irq14: ata0 33
irq17: fwohci0 1
irq18: ndis0 757379
irq21: ohci0+ 382
cpu0: timer 1254872
db> c
[halt - sent]
KDB: enter: Line break on console
[thread pid 76 tid 100049 ]
Stopped at kdb_enter+0x2f: nop
db> show intrcnt
irq4: sio0 1009
irq14: ata0 33
irq17: fwohci0 1
irq18: ndis0 992263
irq21: ohci0+ 382
cpu0: timer 1259314
I know the interrupt is actually disabled in the DPC, and
not in the interrupt handler. That's probably the problem.
The DPC is just never getting scheduled, so the interrupt
line is never lowered.
Thanks!
Drew
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