2.6: races between modprobe and depmod in rc.sysinit
From: Andrey Borzenkov (arvidjaar_at_mail.ru)
Date: 07/31/03
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To: linux-kernel@vger.kernel.org Date: Thu, 31 Jul 2003 21:45:01 +0400
This started when I noticed that coldplugging of my USB flash did not work. I
added call to /etc/hotplug/usb.rc in rc.sysinit but it still did not work
because scsi.agent was not ready for 2.6. I fixed scsi.agent to work for 2.6
- and it still did not work with nice message "sd_mod not found". I added
strace to scsi.agent - and wow! it opens /lib/modules/`uname -r`/modules.dep
and reads 0 bytes ... it adds /lib/modules/`uname -r`/modules.alias -and read
0 bytes ...
the only reason I can imagine is that it hits depmod -A that runs in
rc.sysinit and does
truncate /lib/modules/`uname -r`/modules.*
scan modules
write files
So, quesitons
- would anybody (Rusty?) object if I change depmod to do
build temp name
move temp name into original
to avoid such races?
- Chmouel, Fred - is depmod on every boot really neccessary? When people
install modules they are expected to run it actually ...
-andrey
-
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