Re: Fw: PROBLEM: Linux V. 2.6.3 panics with "Buffers at physical address >16Mb used for aha1542" at boot time

Dr. Ernst Molitor
2004-02-20T08:30:53Z

Dear James Bottomley,

thank you very much for looking into the problem I have seen.

Following to your kind suggestion, I have commented out the two "panic
(... Buffers and physical address > 16Mb ...)" lines in the aha1542.c
source and added "BUG();"-lines in their places. Booting the kernel
built afterwards resulted in a bunch of messages; I haven't been able to
read the first lines; this is what I could copy:

[<c02ee972>] scsi_request_fn+0x1c2/0x310
[<c02aa35d>] __elv_add_request+0x2d/0x50
[<c02aca14>] blk_insert_request+0x84/0xc0
[<c02ed679>] scsi_insert_special_req+0x39/0x40
[<c02ed8a9>] scsi_wait_req+0x69/0xb0
[<c02ed7c0>] scsi_wait_done+0x0/0x80
[<c0319980>] sr_do_ioctl+0x90/0x290
[<c0319735>] sr_packet+0x25/0x40
[<c0320262>] cdrom_is_mrw+0x52/0x80
[<c03194b0>] get_capabilities+0x1d0/0x430
[<c023d87f>] sprintf+0x1f/0x30
[<c0318fd1>] sr_probe+0x1f/0x30
[<c02a736d>] bus_match+0x3d/0x70
[<c02a74ac>] driver_attach+0x5c/0xa0
[<c02a77c6>] bus_add_driver+0xa6/0xc0
[<c05422ff>] init_sr+0x2f/0x40
[<c05289db>] do_initcalls+0x2b/0xa0
[<c01317d2>] init_workqueues+0x12/0x29
[<c01050ec>] init+0x4c/0x150
[<c01050a0>] init+0x0/0x150
[<c010719d>] kernel_thread_helper+0x5/0x18

Code: 0f 0b 3e 00 c2 5a 43 c0 89 ec 5d c3 8d 76 00 8d bc 28 00 00
<0>Kernel panic: Attempted to kill init!

Please don't hesitate to contact me if I can be of any further help in
this matter.

Best wishes and regards,

Ernst

On Thu, 2004-02-19 at 21:18 -0500, James Bottomley wrote:

> On Wed, 2004-02-18 at 20:12, Andrew Morton wrote:
> > thank you very much for your work on Linux. Today, I came across a
> > problem; sorry, I have failed in trying to spot the cause...
> >
> > [1.] Linux V. 2.6.3 panics with "Buffers at physical address >16Mb used
> > for aha1542" at boot time on my box.
>
> Could you replace the panic with a BUG() statement and make sure you
> have CONFIG_KALLSYMS set, that should give us a backtrace showing where
> the bad kernel allocation is.
>
> Thanks,
>
> James
>
>
>
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