Date: Tue, 14 Nov 2017 15:05:19 -0500 (PET)
From: Alvaro Aguayo Garcia-Rada <aaguayo@opensysperu.com>
To: Arjun Ranade <ranade@nodalexchange.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Message-ID: <1284888832.404212.1510689919110.JavaMail.zimbra@opensysperu.com>
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Subject: Re: PG10 - Out of shared memory / invalid memory alloc
 request size
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Thread-Topic: PG10 - Out of shared memory / invalid memory alloc request size
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Try with:

echo "18446744073709551615" > /proc/sys/kernel/shmax

Then restart postgres

Regards,

Alvaro Aguayo
Operations Manager
Open Comb Systems E.I.R.L.

Office: (+51-1) 3377813 | Mobile: (+51) 995540103 | (+51) 954183248
Web: www.ocs.pe

----- Original Message -----
From: "Arjun Ranade" <ranade@nodalexchange.com>
To: "Alvaro Aguayo Garcia-Rada" <aaguayo@opensysperu.com>
Cc: "pgsql-admin" <pgsql-admin@postgresql.org>
Sent: Tuesday, 14 November, 2017 15:00:03
Subject: Re: [ADMIN] PG10 - Out of shared memory / invalid memory alloc request size

/proc/sys/kernel/shmax = 68719476736


On Tue, Nov 14, 2017 at 2:53 PM, Alvaro Aguayo Garcia-Rada <
aaguayo@opensysperu.com> wrote:

> I remember an old issue I had with postgres and shared memory being set
> too low by the distro I was using.
>
> What's the value of "/proc/sys/kernel/shmmax"? Try setting to
> 18446744073709551615
>
> Regards,
>
> Alvaro Aguayo
> Operations Manager
> Open Comb Systems E.I.R.L.
>
> Office: (+51-1) 3377813 | Mobile: (+51) 995540103 | (+51) 954183248
> Web: www.ocs.pe
>
> ----- Original Message -----
> From: "Arjun Ranade" <ranade@nodalexchange.com>
> To: "pgsql-admin" <pgsql-admin@postgresql.org>
> Sent: Tuesday, 14 November, 2017 14:44:08
> Subject: [ADMIN] PG10 - Out of shared memory / invalid memory alloc
> request size
>
> We recently upgraded a database that a number of developers use from
> Postgres 9.4 to 10.  Our memory parameters are unchanged.
>
> We are seeing a lot of errors that look like this in the postgres log:
>
> < 2017-11-14 13:13:59 EST [144172] : [1-1]
> user=[unknown],db=qa16,remote=192.168.104.22(35238) > FATAL:  no
> PostgreSQL
> user name specified in startup packet
> < 2017-11-14 13:52:22 EST [6273] : [1-1]
> user=deployment_app,db=qa5,remote=192.168.104.83(45384) > ERROR:  out of
> shared memory
> < 2017-11-14 14:17:53 EST [6200] : [3-1]
> user=service_tracker_app,db=qa16,remote=192.168.104.22(46996) > ERROR:
> invalid memory alloc request size 34359738368
>
> Anecdotally it seems that these errors are happening when
> powa_take_snapshot() (Postgres workload analyzer) is running as well but I
> can't confirm that.
>
> Does anyone know how to debug these types of errors?  And once the db is in
> this state, how do we resolve sessions reporting "Error: invalid memory
> alloc request size" - killing the sessions and having them reconnect does
> not fix the issue.
>
> Thanks,
> Arjun
>


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