[lkml]   [2005]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Fastboot] kdump's dump capture kernel fails (APICs & linux-2.6.15-rc1)
On Mon, 2005-11-21 at 00:46 +0900, Fernando Luis Vazquez Cao wrote:
> Hi Eric,
> It seems there are still some problems with the initialization of the
> APICs in the second kernel. As you can see from the serial line captures
> below, early during the boot process the kernel is flooded with
> "unexpected IRQ trap at vector ##" errors and fails to boot.
> Some basic details about the machine:
> - Dual Xeon Hyper-Threading 2.4GHz
> - 1GB RAM
> In this particular machine the problem could be solved by reintroducing
> the APICs shutdown patch. The drawback with this approach is that
> LAPIC/IOAPIC registers setup for the legacy PIC mode differs a lot
> between mother boards and the somewhat hackish shutdown code fails to
> set the APICs properly under certain configurations.

I have just realized that the "move apic init in init_IRQs" patches by
Eric were reverted back. Besides, APICs shutdown code made it back into
This is a desirable stopgap solution that will solve the problem for
some machines and configurations.

Anyway, up to now, the "LAPIC/IO-APIC save/restore" solution is the only
one that has worked reliably for us (even with badly broken BIOSes).

I will test Eric's patches and report the results.



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-11-21 08:30    [W:0.039 / U:1.596 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site