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SubjectRe: Kernel Panic: too few segs for DMA mapping increase AHC_NSEG
Date
I have applied your patch against kernel 2.4.16
This was the message:

(Stripping trailing CRs from patch.)
patching file drivers/scsi/aic7xxx/aic7xxx_linux.c
Hunk #1 succeeded at 625 (offset 1 line).
Hunk #3 succeeded at 1714 (offset 1 line).

Then I built a kernel with hi mem support, and vfat driver built as a module.
reboot machine with new kernel.

Root login, modprobe vfat (modutils 2.4.12) and I always get this message:

Warning: loading /lib/modules/2.4.16/kernel/fs/vfat/vfat.o will taint the kernel: no license

Then I try I mount the vfat filesystem:

mount /dev/sda2 /mnt

and when I try to copy a file from the vfat FS to the linux root FS I get this kernel panic message

code: 0f 0b 80 4f 07 80 8b 03 8b 53 2c 83 ca 82 89 50 14 8b 13 8b
too few segs for dma mapping increase ahc-nseg
invalid operand: 0000
cpu: 0
eip: 0010 : [<c017f8b5>] tainted: P
eflags: 000010046
eax: ffffffff ebx: f7ea58f0 ecx: c0214000 edx: 00000000
esi: 00001000 edi: e3062800 ebp: f7ea1b40 esp: c0215e08
ds: 0018 es: 0018 ss: 0018
process swapper (pid:0, stackpage=c0215000)

<0>Kernel panic: Aiee, killing interrupt handler!
in interrupt handler_not syncing.


ebx, edi, ebp values change at every panic.

Hope this help you.

----- Original Message -----
From: "Jens Axboe" <axboe@suse.de>
To: "Marco Berizzi" <pupilla@hotmail.com>
Cc: <chaffee@cs.berkeley.edu>; <linux-kernel@vger.kernel.org>
Sent: Tuesday, November 27, 2001 9:11 AM
Subject: Re: Kernel Panic: too few segs for DMA mapping increase AHC_NSEG


> On Tue, Nov 27 2001, Marco Berizzi wrote:
> > I have upgraded my PC from 768MB RAM to 1GB.
> > I have recompiled the kernel (2.4.16) for hi mem support (4GB).
> >
> > I have several file system on the same disk (vfat file system). I have
> > compiled vfat driver both in the main kernel and as a module. When I
> > load the module I issue a
> > 'modprobe vfat' and I get this message (only with hi mem kernel
> > support):
> >
> > Warning: loading /lib/modules/2.4.16/kernel/fs/vfat/vfat.o will taint
> > the kernel: no license
> > I'm using Slackware 8.0. + modutils 2.4.12
> >
> > Then if I try to copy a file from that filesystem to the root filesystem
> > I get this error:
> >
> > Kernel panic: too few segs for DMA mappings increase AHC_NSEG
> >
> > Kernel panic: too few segs for DMA mappings increase AHC_NSEG
>
> You still haven't applied the patch I sent? Sending the same report
> without this extra added infor 2 or 3 times isn't doing any good, sorry.
>
> --
> Jens Axboe
>
>
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