From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@enterprisedb.com>
cc: Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>,
        amul sul <sul_amul@yahoo.co.in>,
        PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Server crash due to SIGBUS(Bus Error) when trying to access the
 memory created using dsm_create().
In-reply-to: 
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 <26247.1506349378@sss.pgh.pa.us> <488.1506364109@sss.pgh.pa.us> !
 <2034.1506365794@sss.pgh.pa.us> <11339.1506370389@sss.pgh.pa.us>
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Comments: In-reply-to Thomas Munro <thomas.munro@enterprisedb.com>
	message dated "Tue, 26 Sep 2017 10:34:50 +1300"
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Date: Tue, 26 Sep 2017 13:49:52 -0400
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Thomas Munro <thomas.munro@enterprisedb.com> writes:
> See attached, which also removes the ENOSYS stuff which I believe to
> be now useless.  Does this make sense?  Survives make check-world and
> my simple test procedure on a 3.10.0-327.36.1.el7.x86_64 system.

Thanks.  Works on my RHEL6 box too, so pushed.

This certainly explains the "could not resize ...: Success" oddity
we see in the buildfarm.  It's not so clear why those critters are
failing in the first place.  I hope that what is happening is that
they are getting EINTR results and failing to retry.  (Although
my RHEL6 man page doesn't mention EINTR as a possible failure,
I see that's been corrected in later editions.)  If not, we should
at least get a better fix on the nature of the failure with this
patch.  Awaiting buildfarm results ...

			regards, tom lane


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