Problems with modules in 2.3.51

From: Roman V. Shaposhnick (roman@yellow.pdmi.ras.ru)
Date: Sat Mar 11 2000 - 05:52:59 EST

  • Next message: Manfred Spraul: "Re: ADFS -> undefined reference to __cmpdi2 (2.3.51)"

    Hi,

    I would like to mention that in 2.3.51 there is a huge problem with
    modules related to recent changes in fs-register-unregister interface.

    First let's see the bug itself:

    yellow:/usr/src/linux/fs/isofs # insmod ./isofs.o
    yellow:/usr/src/linux/fs/isofs # lsmod
    Module Size Used by
    isofs 19164 0 (unused)
    yellow:/usr/src/linux/fs/isofs # mount /dev/hdc /cdrom
    mount: block device /dev/hdc is write-protected, mounting read-only
    yellow:/usr/src/linux/fs/isofs # lsmod
    Module Size Used by
    isofs 19164 3
    yellow:/usr/src/linux/fs/isofs # ls /cdrom
    . .. dist from~1.nic store
    yellow:/usr/src/linux/fs/isofs # umount /cdrom
    yellow:/usr/src/linux/fs/isofs # lsmod
    Module Size Used by
    isofs 19164 2
    yellow:/usr/src/linux/fs/isofs # rmmod isofs
    isofs: Device or resource busy

    As you can see there are extra 2 "links" to the module left.

    I dig the problem and have found that it seems to be a bug in
    'try_inc_mod_count'. Or in how it is used. Nevertheless, I suggest
    something like splitting this function in two -- one that checks and
    one that sets usecount value.

    I suspect who is the author of these changes ( Al, is it you ? :) ). But
    since I do not know exactly who it is, I think you excuse me for the
    wide distribution.

    Thanks,
    Roman.

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