| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: intermittent failures in Cygwin from select_parallel tests |
| Date: | 2017-08-03 14:45:50 |
| Message-ID: | CA+TgmoZV3pDkhLEUmo+1ubTWVKv=61maHTtWf0u4J+PGcQGMjw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Aug 2, 2017 at 11:47 PM, Noah Misch <noah(at)leadboat(dot)com> wrote:
> postmaster algorithms rely on the PG_SETMASK() calls preventing that. Without
> such protection, duplicate bgworkers are an understandable result. I caught
> several other assertions; the PMChildFlags failure is another case of
> duplicate postmaster children:
>
> 6 TRAP: FailedAssertion("!(entry->trans == ((void *)0))", File: "pgstat.c", Line: 871)
> 3 TRAP: FailedAssertion("!(PMSignalState->PMChildFlags[slot] == 1)", File: "pmsignal.c", Line: 229)
> 20 TRAP: FailedAssertion("!(RefCountErrors == 0)", File: "bufmgr.c", Line: 2523)
> 21 TRAP: FailedAssertion("!(vmq->mq_sender == ((void *)0))", File: "shm_mq.c", Line: 221)
> Also, got a few "select() failed in postmaster: Bad address"
>
> I suspect a Cygwin signals bug. I'll try to distill a self-contained test
> case for the Cygwin hackers. The lack of failures on buildfarm member brolga
> argues that older Cygwin is not affected.
Nice detective work.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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