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From bugzi...@apache.org
Subject [Bug 62044] shared memory segments are not found in global list, but appear to exist in kernel.
Date Fri, 26 Jan 2018 09:08:35 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=62044

--- Comment #5 from Ruediger Pluem <rpluem@apache.org> ---
(In reply to mark from comment #0)
> With a large number of vhosts ( > 1000 ) and proxy balancer configurations (
> > 1000), we are seeing Apache exit at start up time with a configuration
> error (very frequently) with an error like. 
> 
> [Wed Jan 10 16:28:45.853599 2018] [slotmem_shm:error] [pid 29764:tid
> 140038537377536] (17)File exists: AH02611: create:
> apr_shm_create(/apache24/logs/slotmem-shm-p71143bd8_balancer1.shm) failed
> 
> [Wed Jan 10 16:28:45.853641 2018] [:emerg] [pid 29764:tid 140038537377536]
> AH00020: Configuration Failed, exiting 
> 
> turning on trace5 level logs we see things like the following for a single
> balancer worker (I filtered on the balance SHM name)
> 
> [Thu Jan 25 03:48:08.397926 2018] [slotmem_shm:debug] [pid 13310:tid
> 140455729428224] mod_slotmem_shm.c(364): AH02602: create didn't find
> /apache24/logs/slotmem-shm-pe1b232bb_balancer1.shm in global list


> [Thu Jan 25 03:48:58.529349 2018] [slotmem_shm:debug] [pid 45813:tid
> 139795075143424] mod_slotmem_shm.c(364): AH02602: create didn't find
> /apache24/logs/slotmem-shm-pe1b232bb_balancer1.shm in global list

Hm. The above two lines are weird. mod_proxy_balancer only creates the shm
segments in the post_config phase where there is still only one httpd process.
But I see two different pid's in the above log messages. Did you do a graceful
restart between 03:48:08 and 03:48:58?

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