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    SubjectRe: BUG: atomic counter underflow [Was: 2.6.16-rc6-mm1]
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    Ian Kent napsal(a):
    > On Sun, 12 Mar 2006, Jiri Slaby wrote:
    >
    >> Andrew Morton wrote:
    >>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.16-rc6/2.6.16-rc6-mm1/
    >> [snip]
    >>> +remove-redundant-check-from-autofs4_put_super.patch
    >>> +autofs4-follow_link-missing-funtionality.patch
    >>>
    >>> Update autofs4 patches in -mm.
    >> Hello,
    >>
    >> I caught this during ftp browsing autofs-bind-mounted directories. I don't know
    >> circumstancies and if the patches above are source of problem. I also don't know
    >> if -rc6-mm1 is the first one.
    >
    > btw what do you mean autofs-bind-mounted ?
    Hmm, I am unable to reproduce it :(.
    I have ftp dir, there is misc directory which is autofs maintained and --bind
    mounted directories from some corners of / (i. e. ntfs and ext3 dirs mounted
    through --bind).
    in /etc/auto.master:
    ...
    /home/ftp/misc /etc/auto.ftpmisc
    ...

    in /etc/auto.ftpmisc:
    ...
    l -fstype=bind :/l/latest
    ...

    Somebody was browsing through the ftp binded tree and these bugs appeared (only
    twice).
    >
    >> BUG: atomic counter underflow at:
    >> [<c0104736>] show_trace+0x13/0x15
    >> [<c0104873>] dump_stack+0x1e/0x20
    >> [<c01d6c97>] autofs4_wait+0x751/0x93a
    >> [<c01d543b>] try_to_fill_dentry+0xca/0x11c
    >> [<c01d59b3>] autofs4_revalidate+0xe1/0x148
    >> [<c0171338>] do_lookup+0x40/0x157
    >> [<c0172ec4>] __link_path_walk+0x804/0xe8c
    >> [<c017359c>] link_path_walk+0x50/0xe8
    >> [<c01738b7>] do_path_lookup+0x10f/0x26d
    >> [<c017429c>] __user_walk_fd+0x33/0x50
    >> [<c016d226>] vfs_stat_fd+0x1e/0x50
    >> [<c016d30d>] vfs_stat+0x20/0x22
    >> [<c016d328>] sys_stat64+0x19/0x2d
    >> [<c0103127>] syscall_call+0x7/0xb
    >>
    >
    > There's some suspicious code in waitq.c.
    > Could you try the following patch for me please?

    I can't confirm... I don't know.

    regards,
    - --
    Jiri Slaby www.fi.muni.cz/~xslaby
    \_.-^-._ jirislaby@gmail.com _.-^-._/
    B67499670407CE62ACC8 22A032CC55C339D47A7E
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