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    SubjectRe: [RFC PATCH] shrink_dcache_parent() deadlock
    Linus Torvalds <> writes:

    > On Mon, Jan 9, 2012 at 2:58 AM, Miklos Szeredi <> wrote:
    >> This patch adds a new dentry flag that is set when the dentry is removed
    >> from the lru and put on the list being processed by
    >> shrink_dentry_list().  The flag is cleared in dentry_lru_del() which is
    >> called if the dentry gets a new reference just before it's pruned.
    >> Thoughts?
    > Looks reasonable. Were you actually able to reproduce the hang, or how
    > did you notice?

    We got a bug report from a partner about hang during reboot. It's
    actually quite easily reproducible with:

    while true; do
    echo -bond0 > /sys/class/net/bonding_masters
    echo +bond0 > /sys/class/net/bonding_masters
    echo -bond1 > /sys/class/net/bonding_masters
    echo +bond1 > /sys/class/net/bonding_masters

    That reliably triggers the soft lookup detector for several machines
    that we tested. It's rather timing sensitive though, because turning on
    DEBUG_SPINLOCK makes it go away.

    I had to add printks to see what's going on, because it wasn't obvious
    from the stack traces and crash dumps.

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      Last update: 2012-01-09 18:09    [W:0.030 / U:68.020 seconds]
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