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    SubjectNULL pointer dereference at fat_detach
    Hi

    From time to time Fedora users reports crash at fat_detach.
    It happens randomly and seldom. Seems to be related with
    unmount operation.

    Early reports are from 3.0 and problem still randomly occurs
    on recent kernels.

    Calltraces looks like below:

    BUG: unable to handle kernel NULL pointer dereference at 0000009c
    IP: [<c046d983>] do_raw_spin_lock+0xd/0x1e

    [<c07fcc94>] _raw_spin_lock+0xd/0xf
    [<f8fe03de>] fat_detach+0x20/0x59 [fat]
    [<f8fe0874>] fat_evict_inode+0x5b/0x5e [fat]
    [<c05058ad>] evict+0x57/0xe9
    [<c0505a67>] iput+0xf8/0xfd
    [<c051ce0f>] fsnotify_destroy_mark+0xdf/0xf8
    [<c051e488>] sys_inotify_rm_watch+0x59/0x79
    [<c07fcfbc>] syscall_call+0x7/0xb

    what most likely indicate that fat_evict is called with
    inode with i_sb->s_fs_info == NULL.

    Some more info about this problem can be found here:
    https://bugzilla.redhat.com/show_bug.cgi?id=768534

    Any insight on this isssue is welcome.

    Thanks
    Stanislaw


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