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    SubjectRe: BUG: atomic counter underflow [Was: 2.6.16-rc6-mm1]
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    Jiri Slaby napsal(a):
    > 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 :(.
    Yup, I've got it:
    while /bin/true; do cd /home/ftp/misc/.ftpaccess; done
    [nonexistent dir]
    kill it
    and

    Mar 19 02:03:08 localhost automount[25680]: failed to mount
    /home/ftp/misc/.ftpaccess
    Mar 19 02:03:08 localhost automount[25682]: failed to mount
    /home/ftp/misc/.ftpaccess
    Mar 19 02:03:08 localhost kernel: BUG: atomic counter underflow at:
    Mar 19 02:03:08 localhost kernel: [<c0104736>] show_trace+0x13/0x15
    Mar 19 02:03:08 localhost kernel: [<c0104873>] dump_stack+0x1e/0x20
    Mar 19 02:03:08 localhost kernel: [<c01d6c97>] autofs4_wait+0x751/0x93a
    Mar 19 02:03:08 localhost kernel: [<c01d543b>] try_to_fill_dentry+0xca/0x11c
    Mar 19 02:03:08 localhost kernel: [<c01d59b3>] autofs4_revalidate+0xe1/0x148
    Mar 19 02:03:08 localhost kernel: [<c0171338>] do_lookup+0x40/0x157
    Mar 19 02:03:08 localhost kernel: [<c0172ec4>] __link_path_walk+0x804/0xe8c
    Mar 19 02:03:08 localhost kernel: [<c017359c>] link_path_walk+0x50/0xe8
    Mar 19 02:03:08 localhost kernel: [<c01738b7>] do_path_lookup+0x10f/0x26d
    Mar 19 02:03:08 localhost kernel: [<c017429c>] __user_walk_fd+0x33/0x50
    Mar 19 02:03:08 localhost kernel: [<c0174412>] __user_walk+0x17/0x19
    Mar 19 02:03:08 localhost automount[25683]: failed to mount
    /home/ftp/misc/.ftpaccess
    Mar 19 02:03:08 localhost kernel: [<c0162fb3>] sys_chdir+0x1a/0x77
    Mar 19 02:03:08 localhost kernel: [<c0103127>] syscall_call+0x7/0xb
    Mar 19 02:03:08 localhost automount[25684]: failed to mount
    /home/ftp/misc/.ftpaccess

    Now, I am going to test, if this dissapeared after your patch.

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