Re: [BUGS] BUG #14835: Postgres crashed

On 09/28/2017 05:46 PM, nicola.contu@gmail.com wrote:
> The following bug has been logged on the website:
> 
> Bug reference:      14835
> Logged by:          Nicola Contu
> Email address:      nicola.contu@gmail.com
> PostgreSQL version: 9.6.5
> Operating system:   Centos 6.9
> Description:        
> 
> Hello,
> after upgrading to postgres 9.6.5 in the last 3weeks we had the db crashing
> three times for the same reason :
> 
> SELECT: double free or corruption (!prev): 0x0000000001f4b440 ***
> ======= Backtrace: =========
> /lib64/libc.so.6[0x3eee675dee]
> /lib64/libc.so.6[0x3eee678c80]
> 
> 
> ======= Memory map: ========
> 00400000-009ff000 r-xp 00000000 fd:00 6431324
> /usr/local/pgsql9.6.5/bin/postgres

Yes, this seems like a bug, but it's quite unclear if it's in PostgreSQL
or due to a bug in some other library.

Please, make sure next time a core dump is generated, so that you can
inspect it,  and generate backtrace for example. You'll probably have to
do this:

1) install debuginfo packages (likely using debuginfo-install)

2) enable core files (you'll probably have to set limits in limits.conf
and set core_pattern), see [1] for details

It might also be useful to know what query was being executed at the
time of the crash - that should be logged into the PostgreSQL log.

[1] http://man7.org/linux/man-pages/man5/core.5.html

regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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