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Re: LOG: munmap(0x7fff80000000) failed: Invalid argument

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One extra bit, if this helps:

chrisr@ff1:~$ cat /proc/meminfo
MemTotal:        8163104 kB
MemFree:         2183692 kB
MemAvailable:    3648680 kB
Buffers:          170080 kB
Cached:          1231708 kB
SwapCached:            0 kB
Active:          1083596 kB
Inactive:         442312 kB
Active(anon):     125128 kB
Inactive(anon):     3584 kB
Active(file):     958468 kB
Inactive(file):   438728 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        499708 kB
SwapFree:         499708 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:        124124 kB
Mapped:            42472 kB
Shmem:              4596 kB
Slab:             144788 kB
SReclaimable:      97612 kB
SUnreclaim:        47176 kB
KernelStack:       10672 kB
PageTables:         6332 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2484108 kB
Committed_AS:     900632 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      202276 kB
VmallocChunk:   34359464540 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       4
HugePages_Free:        3
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB
DirectMap4k:       83776 kB
DirectMap2M:     4110336 kB
DirectMap1G:     6291456 kB

On Mon, Oct 10, 2016 at 5:21 PM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
Chris Richards <chris@xxxxxxxxxxx> writes:
> Setting up postgresql-9.5 (9.5.4-1.pgdg14.04+2) ...
> Creating new cluster 9.5/main ...
>   config /etc/postgresql/9.5/main
>   data   /var/lib/postgresql/9.5/main
>   locale en_US.UTF-8
> LOG:  munmap(0x7fff80000000) failed: Invalid argument
> [... snip 14 or so repeats ...]
> LOG:  munmap(0x7fff80000000) failed: Invalid argument
>   socket /var/run/postgresql
>   port   5433
> update-alternatives: using
> /usr/share/postgresql/9.5/man/man1/postmaster.1.gz to provide
> /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode
>  * Starting PostgreSQL 9.5 database server
>       [ OK ]
> Processing triggers for libc-bin (2.19-0ubuntu6.6) ...

> I'm able to connect and I dumped a few default relations.

> Is the munmap error of concern? It remains upon rebooting / restarting the
> server.

Seems pretty fishy to me; I don't know what would be causing it.

[ digs in code... ]  One theory is that PGSharedMemoryDetach is getting
called more than once, but I'm not sure how that would happen.  Can you
characterize where this happens more precisely?  What nondefault settings
have you got in postgresql.conf?

                        regards, tom lane


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