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From Eric Covener <>
Subject Re: [users@httpd] Lots of messages "[ssl:warn] Resource deadlock avoided: AH02026: Failed to acquire SSL session cache lock"
Date Thu, 10 Mar 2016 13:32:26 GMT
On Thu, Mar 10, 2016 at 8:08 AM, Yann Ylavic <> wrote:
> Honestly I don't know how "fnctl" works on Linux, but I'd recommend
> using no Mutex directive at all (same as "Mutex default") which falls
> back to "Mutex sysvsem default" given your output of apachectl (i.e.
> "-D APR_USE_SYSVSEM_SERIALIZE"), or possibly "Mutex pthread default"
> which is the most efficient on Linux IMHO (also robust, leaks free on
> crashes).

There is an old dev@ thread that talks about the same deadlock
avoidance issues from fcntl
on other platforms (at least Solaris). I think it's not really usable
in httpd as soon as you have two mutexes.

Eric Covener

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