Re: Race condition in module load causing undefined symbols
From: Stephen Lord (lord_at_xfs.org)
Date: 06/11/05
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Date: Fri, 10 Jun 2005 22:30:46 -0500 To: Andrew Morton <akpm@osdl.org>
Andrew Morton wrote:
> Stephen Lord <lord@xfs.org> wrote:
>
>>I am having troubles getting any recent kernel to boot successfully
>> on one of my machines, a generic 2.6GHz P4 box with HT enabled
>> running an updated Fedora Core 3 distro. This is present in
>> 2.6.12-rc6. It does not manifest itself with the Fedora Core
>> kernels which have identical initrd contents as far as the
>> init script and the set of modules included goes.
>>
>> The problem manifests itself as various undefined symbols from
>> module loads.
>
>
> Peculiar. Module loading is all synchronous, isn't it?
>
Well, things are getting more bizarre, adding sleeps between
module loads cures the problem with missing symbols. I then
run into a problem with device mapper/lvm which seems to be
having problems setting up devices. In this section of
the init script:
umount /sys
echo Mounting root filesystem
mount -o defaults --ro -t ext3 /dev/root /sysroot
mount -t tmpfs --bind /dev /sysroot/dev
echo Switching to new root
switchroot /sysroot
umount /initrd/dev
The correct number of volumes are found, but adding a showlabels
command to the init script fails to display them, it spits out
errors about readdir failures in /dev/Volume00
The umount of /sys fails, the root mount fails and obviously, the
switchroot then fails.
I tried using the same config options as the redhat supplied
kernel without any success, this still has module symbol
problems.
I am baffled, but it looks like it is not a symbol table problem.
Steve
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- Previous message: randy_dunlap: "Re: 2.6: problem with module tainting the kernel"
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