Re: slotmem error still occuring after updating to Apache 2.4.43 APR 1.7.0

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Yes, it is literal we are still seeing the issue. I saw a work around of minimizing the proxy.conf file and adding vhosts to split up the calls. 

The https://bz.apache.org/bugzilla/show_bug.cgi?id=62044 bug fix which was recently updated with a work around on  09/2020.

 

Dasharath Masirkar 2020-09-02 09:11:57 UTC

- This issue can be workaround by configuring multiple instances of httpd to handle such high vhost and proxy balancer configuration instead of putting all in single instance. I have tested it and works for me. We may have an issue with having so many items in our proxy balancer config file and splitting it up with separate vhosts could solve the problem.

 

This has nothing to do with underlying SHM stuff and everything to do with how multiple balancers, global and outside of virtual hosts, are initialized and sometimes persisted. This was changed greatly in 2.4.29.You should find the minimal set of balancers that reproduces the error and It is likely related to duplicate virtual hosts or duplicate proxy "workers".

https://bz.apache.org/bugzilla/show_bug.cgi?id=62044


On Wed, Aug 26, 2020 at 6:18 PM Wendell Hatcher <wendellhatcher1074@xxxxxxxxx> wrote:
>
> Still seeing, as in a problem that you had both before and after
> the update? Yes both before the update and after. This was during a shutdown. Why is it occurring during a bad shutdown? Yes, we have multiple instances running?

Wendell

> On Aug 26, 2020, at 6:14 PM, Nick Kew <niq@xxxxxxxxxx> wrote:
>
> On Wed, 26 Aug 2020 16:34:00 -0400
> Wendell Hatcher <wendellhatcher1074@xxxxxxxxx> wrote:
>
>> Hello, I updated to the latest version of the APR and Apache but I am
>> still seeing the following slotmem error.
>
> Still seeing, as in a problem that you had both before and after
> the update? Yes both before the update and after. This was during a shutdown. Why is it occurring during a bad shutdown? Yes, we have multiple instances running?
>
>>  We run multiple apache
>> services on a single box as well.
>
> Multiple instances of the server, all in the same filesystem?
>
>> error.2020.08.26:[Wed Aug 26 09:37:42.188705 2020]
>> [slotmem_shm:error] [pid 125624:tid 140664905795392] (17)File exists:
>> AH02611: create:
>
> That would most usually happen if a process doesn't shut down cleanly,
> and so fails to clean up filesystem entries (e.g. a crash or kill).
> But your "multiple services" comment leads me to wonder if you have
> two or more instances in conflict.
>
>> apr_shm_create(lotmem-shm-p7bed9088_s4taskcxml_c3_0.shm) failed
>
> Is that a literal transcription?  I'm looking at the apparent
> argument there!
>
> --
> Nick Kew
>
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