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Subject [Bug 53999] Deadlock between procmgr_send_spawn_cmd()/proctable_lock() in mod_fcgid and listener_thread() in worker_mpm
Date Tue, 06 Dec 2016 16:57:16 GMT

--- Comment #10 from Bartosz Kwitniewski <> ---
Just a note: if You have strange crashes/deadlocks while using "Mutex sem",
then it might be related to semaphore arrays limit in the kernel, which is 128
by default. You can check semaphores currently used by Apache with "ipcs -s".
Limit can be changed from 128 to e.g. 1024 using sysctl (last number is the

sysctl -w kernel.sem="250 32000 32 1024"

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