Re: [sqlsmith] Parallel worker crash on seqscan

From: Andreas Seltenreich <seltenreich(at)gmx(dot)de>
To: Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: [sqlsmith] Parallel worker crash on seqscan
Date: 2016-11-21 22:14:20
Message-ID: 87r3645vlv.fsf@ex.ansel.ydns.eu
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Hi,

Ashutosh Sharma writes:

>> the following query appears to reliably crash parallel workers on master
>> as of 0832f2d.

> As suggested, I have tried to reproduce this issue on *0832f2d* commit but
> could not reproduce it.

as Tom pointed out earlier, I had secretly set parallel_setup_cost and
parallel_tuple_cost to 0. I assumed these were irrelevant when
force_parallel_mode is on. I'll do less assuming and more testing on a
vanilla install on future reports.

Sorry for the inconvenience,
Andreas

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