Re: Problems module autoload in 2.6.x

[Thomas Steudten <alpha@steudten.com>]

Hi

2.6.4 on alpha:

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

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

=> 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
=> FAILED
modprobe -v floppy
insmod /lib/modules/2.6.4/kernel/drivers/block/floppy.ko
=> OK
mdir a:
=> OK

My questions are:
1. What process name has the "new" kmod? There´s no such process in the
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´t be autoloaded any more since
>>2.4.21. There´s no block-major aso. request in the kernel-ring buffer.
>>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?
> 
> 
> Check you have CONFIG_KMOD=y.  If so, the correct way of debugging
> module problems is something like this:
> 
> 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
> 
> Then do something that should cause the module to load: you'll see the
> command which gets called in /tmp/modprobe.log.  Then you can add "-v"
> and run it manually, hopefully providing enlightenment.


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