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From: "Ivan Voras" <ivoras@freebsd.org>
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Subject: Re: Kernel panic on PowerEdge 1950 under certain stress load
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On 25/09/2007, Kris Kennaway <kris@freebsd.org> wrote:

> Not in the sense of transmuting a sleep mutex into a spin mutex, no.
> sleep mutexes will spin when the lock holder is currently running, but
> this happens within the context of the mtx_lock_sleep function itself.

Ok, thanks, this clears things a bit for me.