Re: 3.15-rc5 soft-lockup in dentry_kill

[Al Viro]

On Mon, May 12, 2014 at 09:21:53AM -0400, Josh Boyer wrote:
> Hi All,
> 
> We got a report[1] of udevd hanging up in a soft lockup with 3.15-rc5
> over the weekend.  The backtrace is below.  I know there were a number
> of recent changes here, so hopefully this triggers someone's memory.

Reproducer would be nice...  Incidentally, kernfs ->d_revalidate() looks
like a massive source of contention - it grabs a system-wide mutex all
the time, and I'd like to see profiles on the loads that go anywhere near
that sucker.
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