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    SubjectRe: kernel BUG at include/linux/dcache.h:271!
    Maneesh Soni <maneesh@in.ibm.com> wrote:
    >
    > The problem is that we have multiple ramdisks but all have
    > common request queue and common elevator. In terms of sysfs we
    > have multiple kobjects for multiple ramdisks, but one single kobject for the
    > ramdisks' common elevator.
    >
    > While initializing, different kobjects are allocated for the ramdisks but,
    > the common elevator uses the same kobject. In other words, every init
    > of a ramdisk, the common elevator.kobj->parent will be different and it will
    > allocate a new dentry, overwrite the elevator.kobj->dentry
    > and loose the earlier allocated dentries. (see: elv_register_queue())
    >
    > While exiting, it ends up in removing the same dentry (allocated at the last)
    > again and BUGs in dget on dentry with zero ref count.
    >
    > Not sure where it should be fixed
    > ramdisk
    > - should have separate queues on for each ramdisk
    >
    > elevator
    > - should not re-register already registered queue in elv_register_queue
    >
    > sysfs
    > - should handle kobject with multiple parent kobjects

    I can't think of anywhere else where we are likely to want to support
    multiple devices from a single queue in this manner, so perhaps the best
    solution is to remove the exceptional case: allocate a separate queue for
    each ramdisk instance.

    Jens, do you agree?


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