From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Steudten <alpha@steudten.com>
Subject: Re: Problems module autoload in 2.6.x
Date: Wed, 17 Mar 2004 20:18:50 +0100
Sender: linux-admin-owner@vger.kernel.org
Message-ID: <4058A49A.5070608@steudten.com>
References: <4051DA6E.6070809@steudten.com> <1079490472.3400.114.camel@bach>
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To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-admin@vger.kernel.org, Kernel Mailing List <linux-kernel@vger.kernel.org>

Hi

2.6.4 on alpha:

  zgrep -i mod /proc/config.gz
# Loadable module support
CONFIG_MODULES=3Dy
CONFIG_MODULE_UNLOAD=3Dy
# CONFIG_MODULE_FORCE_UNLOAD is not set
CONFIG_OBSOLETE_MODPARM=3Dy
CONFIG_MODVERSIONS=3Dy
CONFIG_KMOD=3Dy
CONFIG_IDEDISK_MULTI_MODE=3Dy

grep -i floppy /etc/modprobe.conf
alias block-major-2-* floppy

strace -estat,open /sbin/modprobe -v floppy
open("/etc/ld.so.preload", O_RDONLY)    =3D -1 ENOENT (No such file or =
directory)
open("/etc/ld.so.cache", O_RDONLY)      =3D 3
open("/lib/libc.so.6.1", O_RDONLY)      =3D 3
open("/etc/modprobe.conf", O_RDONLY)    =3D 3
open("/lib/modules/2.6.4/modules.dep", O_RDONLY) =3D 3
open("/proc/modules", O_RDONLY)         =3D 3
open("/lib/modules/2.6.4/kernel/drivers/block/floppy.ko", O_RDONLY) =3D=
 3
insmod /lib/modules/2.6.4/kernel/drivers/block/floppy.ko

=3D> OK
without module floppy loaded:
mdir a:
Can't open /dev/fd0: No such device or address
No msg in KRB (dmesg) and log from  /tmp/modprobe.log
=3D> FAILED
modprobe -v floppy
insmod /lib/modules/2.6.4/kernel/drivers/block/floppy.ko
=3D> OK
mdir a:
=3D> OK

My questions are:
1. What process name has the "new" kmod? There=B4s no such process in t=
he
table.
2. What triggers to run the prog given in /proc/sys/kernel/modprobe (
for a missing device)?

Strange: Looks like there is no kmod build or loaded or ..
I should look in detail about this..


>>Kernel 2.6.4:
>>Some modules (floppy, lp, loop..) won=B4t be autoloaded any more sinc=
e
>>2.4.21. There=B4s no block-major aso. request in the kernel-ring buff=
er.
>>I have /etc/modules.conf and /etc/modprobe.conf with modutils-2.4.21-=
23.1
>>and depmod -V: module-init-tools 3.0-pre5. How can I track this down?
>>Shouldn't be there a kmod process/ thread in the process list?
>=20
>=20
> Check you have CONFIG_KMOD=3Dy.  If so, the correct way of debugging
> module problems is something like this:
>=20
> echo '#! /bin/sh' > /tmp/modprobe
> echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
> echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
> chmod a+x /tmp/modprobe
> echo /tmp/modprobe > /proc/sys/kernel/modprobe
>=20
> Then do something that should cause the module to load: you'll see th=
e
> command which gets called in /tmp/modprobe.log.  Then you can add "-v=
"
> and run it manually, hopefully providing enlightenment.


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