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    SubjectRe: netfilter: Hung task
    On Mon, 19 Mar 2012, Sasha Levin wrote:

    > lockdep listed all the held locks there.

    None of the locks listed are slub locks.

    > I've mentioned that it looks very similar to
    > https://lkml.org/lkml/2012/1/14/45 where the userspace helper tried to
    > read from the sysfs files, but got into a deadlock since the kernel
    > side held them before it called the usermode helper.

    Ah yes. In that case slub held a semaphore. Code was changed since then to
    no longer hold a semaphore when calling into sysfs.

    The uevent handler can execute arbitrary user space code. Do you have to
    hold locks while calling kmem_cache_destroy?




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