From: Jerry Sievers <gsievers19@comcast.net>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Jerry Sievers <gsievers19@comcast.net>,
  Tomas Vondra <tomas.vondra@2ndquadrant.com>,
  pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: SegFault on 9.6.14
References: <87ims2amh6.fsf@jsievers.enova.com>
	<20190716001529.uvpfngvxtlu5h2fr@development>
	<87blxuakv4.fsf@jsievers.enova.com>
	<20190716003449.fjegtxinhrqubysu@development>
	<87ftn6ojwf.fsf@jsievers.enova.com>
	<20190716082204.iecyfh6mhu6khdhz@development>
	<87blxta8c7.fsf@jsievers.enova.com>
	<CA+hUKGJA8pSGbAsSTLqbvQoLQ63JS4P9ZjdNQ-y+qVbEyjzAdw@mail.gmail.com>
Date: Tue, 16 Jul 2019 18:42:03 -0500
In-Reply-To: 
 <CA+hUKGJA8pSGbAsSTLqbvQoLQ63JS4P9ZjdNQ-y+qVbEyjzAdw@mail.gmail.com>
	(Thomas Munro's message of "Wed, 17 Jul 2019 11:11:41 +1200")
Message-ID: <8736j5a6no.fsf@jsievers.enova.com>
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Thomas Munro <thomas.munro@gmail.com> writes:

> On Wed, Jul 17, 2019 at 11:06 AM Jerry Sievers <gsievers19@comcast.net> wrote:
>
>> (gdb) p *scan->rs_parallel
>> Cannot access memory at address 0x7fa673a54108
>
> So I guess one question is: was it a valid address that's been
> unexpectedly unmapped, or is the pointer corrupted?  Any chance you
> can strace the backend and pull out the map, unmap calls?

There were about 60k lines from strace including these few...


mmap(NULL, 528384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3d0127a000
mmap(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3d01239000
mmap(NULL, 287624, PROT_READ|PROT_WRITE, MAP_SHARED, 124, 0) = 0x7f3d011f2000
mmap(NULL, 262504, PROT_READ|PROT_WRITE, MAP_SHARED, 124, 0) = 0x7f3d011b1000
munmap(0x7f3d011b1000, 262504)          = 0

Thx


-- 
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net