Hi,
On Thu, Apr 16, 2009 at 12:45:31AM +0200, Helge Deller wrote:
> With 2.6.30-rc2 I face a kernel crash on the 32bit hppa architecture
> due to ide-cd when udev creates the device nodes at startup:
>
> Kernel Fault: Code=26 regs=8ed34c40 (Addr=00000024)
> IASQ: 00000000 00000000 IAOQ: 1034b5ac 1034b5b0
> IIR: 4ab30048 ISR: 00000000 IOR: 00000024
> CPU: 0 CR30: 8ed34000 CR31: ffff55ff
> ORIG_R28: 00000000
> IAOQ[0]: ide_complete_rq+0x2c/0x70
> IAOQ[1]: ide_complete_rq+0x30/0x70
> RP(r2): cdrom_newpc_intr+0x178/0x46c
> Backtrace:
> [<1035c608>] cdrom_newpc_intr+0x178/0x46c
> [<1034c494>] ide_intr+0x1b0/0x214
> [<1016d284>] handle_IRQ_event+0x70/0x150
> [<1016d4b0>] __do_IRQ+0x14c/0x1cc
> [<102f7864>] superio_interrupt+0x88/0xbc
> [<1016d284>] handle_IRQ_event+0x70/0x150
> [<1016d4b0>] __do_IRQ+0x14c/0x1cc
> [<10112efc>] do_cpu_irq_mask+0x9c/0xd0
> [<10116068>] intr_return+0x0/0x4
>
> This crash seems to happen due to an uninitialized variable "rc".
> The compiler even warns about that:
> CC drivers/ide/ide-cd.o
> /mnt/sda4/home/cvs/parisc/git-kernel/linus-linux-2.6/drivers/ide/ide-cd.c: In function `cdrom_newpc_intr':
> /mnt/sda4/home/cvs/parisc/git-kernel/linus-linux-2.6/drivers/ide/ide-cd.c:612: warning: `rc' might be used uninitialized in this function
can you do
gdb ./vmlinux
and then
(gdb) l *(cdrom_newpc_intr+0x178)
I think I have a suspect but I want to be sure. In order to do that
you'll need a debug kernel (set CONFIG_DEBUG_INFO to 'y' in your
.config). In case the oops above is not from a debug kernel, can you
catch it again and _then_ do the gdb thing since the offset of 0x178 is
most probably going to change. In that case, you have to do
(gdb) l *(cdrom_newpc_intr+NEW_OFFSET_FROM_THE_OOPS)
Thanks.
--
Regards/Gruss,
Boris.
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