linux-kernel - PROBLEM: Postgres fails to start due to kernel issue?

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Message-ID: <4F18B911.2060601@oak.selfip.net>
Date:	Fri, 20 Jan 2012 00:45:05 +0000
From:	Dave Haywood <tla@....selfip.net>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: PROBLEM: Postgres fails to start due to kernel issue?

Hi,

   I noticed after upgrading to 3.2.0-08812-gc2bc3a3 that Postgres-9.1 server fails to start with error:

FATAL:  could not create shared memory segment: Function not implemented
DETAIL:  Failed system call was shmget(key=5432001, size=30523392, 03600).

   After some googling, I thought it was a SYSV shared memory sizing issue but manually changing kernel.shmmax and kernel.shmall had no effect.

   The problem has been introduced between 3.2.0-08694-g53999bf and 3.2.0-08812-gc2bc3a3.

   Let me know if you need any more information.  Bisecting is *very* slow on this machine!

Broken version (latest):

$ sudo sh scripts/ver_linux

Linux s1 3.2.0-09429-g90a4c0f #133 SMP Thu Jan 19 15:17:03 GMT 2012 i686 Pentium III (Coppermine) GenuineIntel GNU/Linux

Gnu C                  4.6.2
Gnu make               3.82
binutils               2.21.1
util-linux             2.19.1
mount                  support
module-init-tools      3.16
e2fsprogs              1.41.14
Linux C Library        2.14.1
Dynamic linker (ldd)   2.14.1
Procps                 3.2.8
Net-tools              1.60_p20110409135728
Kbd                    1.15.3wip
Sh-utils               8.7

$ sudo sysctl -a | grep shm
kernel.shmmax = 33554432
kernel.shmall = 2097152
kernel.shmmni = 4096
kernel.shm_rmid_forced = 0
vm.hugetlb_shm_group = 0

Working version (last good backup):

$ sudo sh scripts/ver_linux

Linux s1 3.2.0 #124 SMP Thu Jan 5 08:06:00 GMT 2012 i686 Pentium III (Coppermine) GenuineIntel GNU/Linux

Gnu C                  4.6.2
Gnu make               3.82
binutils               2.21.1
util-linux             2.19.1
mount                  support
module-init-tools      3.16
e2fsprogs              1.41.14
Linux C Library        2.14.1
Dynamic linker (ldd)   2.14.1
Procps                 3.2.8
Net-tools              1.60_p20110409135728
Kbd                    1.15.3wip
Sh-utils               8.7

$ sudo sysctl -a | grep shm
kernel.shmmax = 33554432
kernel.shmall = 2097152
kernel.shmmni = 4096
kernel.shm_rmid_forced = 0
vm.hugetlb_shm_group = 0

Dave.

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