Re: [HACKERS] Server crash due to SIGBUS(Bus Error) when trying toaccess the memory created using dsm_create().

On Tue, Sep 26, 2017 at 9:57 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
>> On Tue, Sep 26, 2017 at 9:13 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> Pushed with that change; we'll soon see what the buildfarm thinks.
>
> Hmm.  One failure in the test modules:
>
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=rhinoceros&dt=2017-09-25%2020%3A45%3A02
>
> 2017-09-25 13:51:00.753 PDT [9107:6] LOG:  worker process: test_shm_mq
> (PID 9362) exited with exit code 1
> 2017-09-25 13:51:00.753 PDT [9360:7] ERROR:  could not resize shared
> memory segment "/PostgreSQL.1896677221" to 65824 bytes: Success
>
> hostname = centos7x.joeconway.com
> uname -r = 3.10.0-229.11.1.el7.x86_64

I think the problem here is that posix_fallocate() doesn't set errno.
It returns an errno-like value.  This is a difference from
fallocate().  Will write a patch.

-- 
Thomas Munro
http://www.enterprisedb.com


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