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Re: LOG: munmap(0x7fff80000000) failed: Invalid argument - Mailing list pgsql-general

From Chris Richards
Subject Re: LOG: munmap(0x7fff80000000) failed: Invalid argument
Date
Msg-id CAOan6T=fsE+Y0nZyKWchMjw86Gr2pZb5L3EKf7uF71ASiUnyHA@mail.gmail.com
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In response to Re: LOG: munmap(0x7fff80000000) failed: Invalid argument  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: LOG: munmap(0x7fff80000000) failed: Invalid argument  (Tom Lane <tgl@sss.pgh.pa.us>)
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Oh the email spam :P

I did another reboot test to validate the error. It does exist; it does not spam munmap error like it did with the aptitude install.

I then marked the log file, shutdown (1 munmap during), marked it again and then started it (1 munmap during).

MARK PRE-SHUTDOWN
2016-10-11 20:02:45 UTC [1656-2] LOG:  received fast shutdown request
2016-10-11 20:02:45 UTC [1656-3] LOG:  aborting any active transactions
2016-10-11 20:02:45 UTC [1707-2] LOG:  autovacuum launcher shutting down
2016-10-11 20:02:45 UTC [1704-1] LOG:  shutting down
2016-10-11 20:02:45 UTC [1704-2] LOG:  database system is shut down
2016-10-11 20:02:45 UTC [1656-4] LOG:  munmap(0x7fff80000000) failed: Invalid argument
MARK PRE-START
2016-10-11 20:03:02 UTC [9894-1] LOG:  database system was shut down at 2016-10-11 20:02:45 UTC
2016-10-11 20:03:02 UTC [9894-2] LOG:  MultiXact member wraparound protections are now enabled
2016-10-11 20:03:02 UTC [9893-1] LOG:  database system is ready to accept connections
2016-10-11 20:03:02 UTC [9898-1] LOG:  autovacuum launcher started
2016-10-11 20:03:02 UTC [9899-1] LOG:  munmap(0x7fff80000000) failed: Invalid argument
2016-10-11 20:03:02 UTC [9900-1] [unknown]@[unknown] LOG:  incomplete startup packet


On Mon, Oct 10, 2016 at 5:21 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Chris Richards <chris@infinite.io> 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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