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    SubjectRe: Oops when accessing /dev/fd0 (kernel 2.4.7 and devfsd 1.3.11)
    Taylor Carpenter writes:
    > On Tue, Aug 21, 2001 at 11:07:06PM -0600, Richard Gooch wrote:
    > > Taylor Carpenter writes:
    > > Trace; c015469b <devfs_unregister_blkdev+12eb/1960>
    > > Are you unloading the floppy driver at some point? Or using module
    > > autoloading?
    >
    > I am using module autoloading. It seems that right after the
    > mountall script is called this happens.

    You mean the floppy module gets loaded as a result of the mountall
    script being run?

    > > Interesting. What happens if you use /dev/floppy/0 instead of /dev/fd0
    > > in the /etc/fstab? Still an Oops?
    >
    > I will try that...
    >
    > I did not get the oops, but I could not access the device until I manually
    > loaded the floppy module (the /dev/fd0 was created as usual).

    Is the /etc/modules.devfs the one that ships with devfsd?
    Specifically, you need the following line:
    alias /dev/floppy floppy

    and of course the MODLOAD action in /etc/devfsd.conf.

    > After booting w/the floppy module not loaded I can start and stop
    > devfsd and load and unload the floppy module in any order w/o an
    > oops. I only get the oops if the module is loaded during boot.
    >
    > Also when I get the oops during boot, the floppy module is not
    > loaded once the system is through booting and I login, but /dev/fd*
    > are all there! With out the oops /dev/fd* is only there when I load
    > the floppy module (and disappears as usual when I rmmod the module).

    Do you mean to say that the Oops happens during the boot sequence,
    before you can log in?

    > > Strange. I tried the following sequence, without problems:
    > > # devfsd /dev
    > > # mount /floppy
    > > # ls -lF /dev/floppy
    >
    > I could not mount the floppy until I manually loaded the floppy
    > module! This is after editing /etc/fstab as you said below.

    You must have a bogus /etc/devfsd.conf or /etc/modules.devfs file for
    module autoloading not to work.

    > > where /etc/fstab has:
    > > /dev/floppy/0 /floppy ext2 defaults,noauto,user 0 0
    > >
    > > I have nothing in my /etc/devfsd.conf which refers to the floppy.
    >
    > I only reference floppy in my perms file.

    I don't know what a "perms" file is. I know Debian uses some
    convoluted directory tree for devfsd configuration, but frankly, I
    don't want to know about that. If you have one of these monstrosities,
    please collapse them all into a single /etc/devfsd.conf file a report
    based on that.

    > > In addition, I don't have any LOOKUP entries. I did this with 2.4.9 with
    > > devfs-patch-v188.
    >
    > I have many LOOKUP entries. I did not have any specific to
    > /dev/fd*, but that was caught by the .* LOOKUP entry. I commented
    > that out, which is probably why mdir and other commands do not work
    > w/o manually loading floppy.o.

    Oh! Well, duh!

    > > Could you please try reproducing the problem with the setup and sequence I
    > > used?
    >
    > I believe I followed your steps, and had no oops during boot w/the
    > /etc/fstab change. I do not think that made the difference though.
    > I think telling devfsd to not autoload floppy is what let me boot
    > w/o oops. So I think there still is a problem w/loading the floppy
    > module during boot.

    Hm. Please try a virgin 2.4.9 kernel with CONFIG_DEVFS_FS=n and try
    again. I have this feeling that I'm chasing someone else's bug...

    Regards,

    Richard....
    Permanent: rgooch@atnf.csiro.au
    Current: rgooch@ras.ucalgary.ca
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