Alan,

> 
> Are you sure that the patch is causing the crashes? 

I recompiled the kernel again with your patch. The first time I booted it 
crashed immediately with
a kernel panic and rebooted. However, the second time it managed to work for 
about 30 minutes and
then again kernel panic. 
There were approximately the following messages:
=============
IRQ 225: nobody cared (try booting with irqpoll option)
Call trace: <IRQ>...{_report_bad_irq+53}...{ata_interrupt+0x0/0x190 [libata] 
ohci_irq_handler ...
Disabling IRQ #225
ata2: command 0x25 timeout, stat 0x50 host_stat 0x24
=============
Looks like some kind interaction between disk and USB drivers?

The third time (I did enabled the following kernel options: irqpoll apm=off 
apic=off) it got into
kernel panic about 3 minutes after booting with the following messages:
==============
Call trace IRQ {_do_IRQ+91}{do_IRQ+91}{do_IRQ+47}{handle_IRQ_event+26}
{acpi_ev_sci_xrupt_handler+22}{note_interrupt+378}{do_IRQ+215}{do_IRQ+47}
{ret_from_intr+0}<EOI>{default_idle+56}{cpu_idle+97}{start_secondary+1245}

Code 85 c0 7b 48 8b 0d 8c c0 22 00 48 ff c6 48 8d 14 8d 00 00
Kernel panic - not syncing: nmi watchdog
============== 

Igor


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