Re: booting from CD on Alphastation 255

[Uwe Schindler <uwe@thetaphi.de>]

Here is the patch attached. I do not see any correlation to hotplug there. 
The patched code fragment is in all architectures similar, only alpha was 
different. So I took the x86 code for handle_IRQ_event() - and it worked 
until now :)

The crash I seen without this patch was always something like this:
Trace:
[<fffffc000031a164>] handle_IRQ_event+0x74/0xf0
[<fffffc000031ab50>] handle_irq+0xe0/0x1c0
[<fffffc0000329b04>] srm_device_interrupt+0x24/0x40
[<fffffc000031b1f4>] do_entInt+0xf4/0x140
[<fffffc0000315260>] ret_from_sys_call+0x0/0x10
[<fffffc0000316e30>] default_idle+0x0/0x10
[<fffffc0000316e98>] cpu_idle+0x58/0x80
[<fffffc0000316e30>] default_idle+0x0/0x10
[<fffffc0000316e30>] default_idle+0x0/0x10
[<fffffc0000310234>] rest_init+0x34/0x50
[<fffffc000031001c>] __start+0x1c/0x20

Code: 243f0010  245f0020  21c10100  21a20200  a4490008  a4290000 <b4410008> 
b4220000
Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing

Only the trace was sometiomes a little bit different, but handle_IRQ_event 
was alwas the failing function.

At 15:42 02.04.2005, Steve Langasek wrote:
> > The only problem with 2.6.8 and 2.6.10 here was a problem with irq
> > handling. In idle mode the kernel crashes sometimes in function
> > handle_IRQ_event (not in a driver!). Looking into the code I find out that
> > alpha was the only platform where this function diffs from all other
> > architectures (relict from 2.4.x?). After replacing the C code in this
> > function with the x86 code the kernel runs fine (file:
> > arch/alpha/kernel/irq.c).
>
> Ah, that sounds like the crash I was seeing, though it triggered only when
> running hotplug.  Do you have a patch for this that could be sent to the
> Debian kernel maintainers?
>
> Cheers,
> --
> Steve Langasek
> postmodern programmer

-----
Uwe Schindler
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Attachment: kernel-irq.patch
Description: Binary data