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SubjectRe: Kernel Panic: too few segs for DMA mapping increase AHC_NSEG
...not good news.
Same behaviour: without hi mem support all right. With hi mem support
(4GB) I get this error on console, after a kernel dump:

SCSI1:0:0:0 attempt to queue an abort message
SCSI1:0:0:0 command not found
aic7xxx_abort returns 0x2002

Then the system freeze completely, so I press the reset button.
At the startup INIT calls fsck and when the checking is at about 55% it
displays this message:

SCSI1:A:0:0 locking max tag count at 128

then the following startup procedure goes well.
I want to tell you that with this kernel (hi mem support enabled), all
is working perfectly (I can compile a new working kernel, for example).
X Window (4.1) plus kde is working well.
Only when I mount a vfat filesystem type and then I try to copy a file
to the root partition I get this error.
Another point: I usually build only mass storage driver in the kernel
(Adaptec AHA 39160 bios rev 3.10). I build as modules all other HW (nic,
sound, USB), however only the SB PCI512 is loaded in this situation. I
haven't any IDE device just one SCSI HD (IBM DDYS-T18350N firmware rev
S93E) and one Plextor SCSI cdrom (UltraPlex 40max PX-40TS firmware
revision 1.04).

----- Original Message -----
From: "Jens Axboe" <>
To: "Marco Berizzi" <>
Cc: <>
Sent: Monday, November 19, 2001 10:44 AM
Subject: Re: Kernel Panic: too few segs for DMA mapping increase

> On Mon, Nov 19 2001, Marco Berizzi wrote:
> > Hi everybody.
> >
> > I have just upgraded my PC from 768MB RAM to 1GB.
> > I have recompiled the kernel (2.4.14) for hi mem support (4GB).
> >
> > Now it's appening a very strange behaviour.
> > I have several file system on the same disk (vfat file system). I
> > compiled vfat driver as a module. So before try to mount I must
issue a
> > 'modprobe vfat'. I'm using Slackware 8.0. modutils version is 2.4.6
> >
> > Then if I try to copy a file from that filesystem to the root
> > I get this error:
> >
> > Kernel panic: too few segs for DMA mappings increase AHC_NSEG
> Aha! Finally someone that can provoke this easily. Could you please
> apply attached patch and reproduce? Thanks.
> --
> Jens Axboe
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