From: =?utf-8?B?0JDQvdGC0L7QvSDQktC70LDRgdC+0LI=?= <druidvav@gmail.com>
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Subject: Re: BUG #16036: Segmentation fault while doing an update
Date: Fri, 4 Oct 2019 03:55:49 +0300
References: <16036-28184c90d952fb7f@postgresql.org>
To: =?utf-8?B?0JDQvdGC0L7QvSDQktC70LDRgdC+0LI=?= <druidvav@gmail.com>,
 pgsql-bugs@lists.postgresql.org
In-Reply-To: <16036-28184c90d952fb7f@postgresql.org>
Message-Id: <CAD2C97B-FDF9-495E-AC8D-17A882CE3C10@gmail.com>
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Got normal backtrace:

#0  GetMemoryChunkContext (pointer=3D0x0) at =
./build/../src/include/utils/memutils.h:127
#1  pfree (pointer=3D0x0) at =
./build/../src/backend/utils/mmgr/mcxt.c:1033
#2  0x0000564c3f007aca in heap_freetuple (htup=3D<optimized out>) at =
./build/../src/backend/access/common/heaptuple.c:1340
#3  0x0000564c3f1b5889 in tts_buffer_heap_clear (slot=3D0x564c40650298) =
at ./build/../src/backend/executor/execTuples.c:652
#4  0x0000564c3f1b5cbe in ExecClearTuple (slot=3D0x564c40650298) at =
./build/../src/include/executor/tuptable.h:428
#5  ExecResetTupleTable (tupleTable=3D0x564c4068a6b0, shouldFree=3Dfalse) =
at ./build/../src/backend/executor/execTuples.c:1165
#6  0x0000564c3f1abc40 in ExecEndPlan (estate=3D0x564c40689740, =
planstate=3D<optimized out>) at =
./build/../src/backend/executor/execMain.c:1560
#7  standard_ExecutorEnd (queryDesc=3D0x564c40663d80) at =
./build/../src/backend/executor/execMain.c:496
#8  0x0000564c3f30a6e8 in ProcessQuery (plan=3D<optimized out>, =
sourceText=3D0x564c40663c60 "update tracking.test_session set =
list_position =3D list_position + 1 where id =3D $1", =
params=3D0x564c40663cf0, queryEnv=3D0x0, dest=3D0x564c3f8b1c00 =
<donothingDR>,
    completionTag=3D0x7ffd3557c720 "UPDATE 0") at =
./build/../src/backend/tcop/pquery.c:204
#9  0x0000564c3f30a8c3 in PortalRunMulti =
(portal=3Dportal@entry=3D0x564c405cb3b0, =
isTopLevel=3DisTopLevel@entry=3Dtrue, =
setHoldSnapshot=3DsetHoldSnapshot@entry=3Dfalse, dest=3D0x564c3f8b1c00 =
<donothingDR>, dest@entry=3D0x564c4052dc90, altdest=3D0x564c3f8b1c00 =
<donothingDR>,
    altdest@entry=3D0x564c4052dc90, =
completionTag=3DcompletionTag@entry=3D0x7ffd3557c720 "UPDATE 0") at =
./build/../src/backend/tcop/pquery.c:1283
#10 0x0000564c3f30b4db in PortalRun (portal=3Dportal@entry=3D0x564c405cb3b=
0, count=3Dcount@entry=3D9223372036854775807, =
isTopLevel=3DisTopLevel@entry=3Dtrue, run_once=3D<optimized out>, =
dest=3Ddest@entry=3D0x564c4052dc90, =
altdest=3Daltdest@entry=3D0x564c4052dc90,
    completionTag=3D0x7ffd3557c720 "UPDATE 0") at =
./build/../src/backend/tcop/pquery.c:796
#11 0x0000564c3f308d05 in exec_execute_message =
(max_rows=3D9223372036854775807, portal_name=3D0x564c4052d880 "") at =
./build/../src/backend/tcop/postgres.c:2090
#12 PostgresMain (argc=3D<optimized out>, =
argv=3Dargv@entry=3D0x564c40578e80, dbname=3D<optimized out>, =
username=3D<optimized out>) at =
./build/../src/backend/tcop/postgres.c:4297
#13 0x0000564c3effcbe1 in BackendRun (port=3D0x564c40574ba0, =
port=3D0x564c40574ba0) at =
./build/../src/backend/postmaster/postmaster.c:4431
#14 BackendStartup (port=3D0x564c40574ba0) at =
./build/../src/backend/postmaster/postmaster.c:4122
#15 ServerLoop () at ./build/../src/backend/postmaster/postmaster.c:1704
#16 0x0000564c3f28fe81 in PostmasterMain (argc=3D5, argv=3D0x564c40524b70)=
 at ./build/../src/backend/postmaster/postmaster.c:1377
#17 0x0000564c3effdea8 in main (argc=3D5, argv=3D0x564c40524b70) at =
./build/../src/backend/main/main.c:228

> 4 =D0=BE=D0=BA=D1=82. 2019 =D0=B3., =D0=B2 3:29, PG Bug reporting form =
<noreply@postgresql.org> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0=
):
>=20
> The following bug has been logged on the website:
>=20
> Bug reference:      16036
> Logged by:          =D0=90=D0=BD=D1=82=D0=BE=D0=BD =D0=92=D0=BB=D0=B0=D1=
=81=D0=BE=D0=B2
> Email address:      druidvav@gmail.com
> PostgreSQL version: 12.0
> Operating system:   PostgreSQL 12.0 (Debian 12.0-1.pgdg90+1) on x86_64
> Description:       =20
>=20
> I am having segmentation fault like this:
>=20
> 2019-10-04 02:30:02 MSK [16919-6] LOG:  server process (PID 18415) was
> terminated by signal 11: Segmentation fault
> 2019-10-04 02:30:02 MSK [16919-7] DETAIL:  Failed process was running:
> update tracking.test_session set list_position =3D list_position + 1 =
where id
> =3D $1
> 2019-10-04 02:30:02 MSK [16919-8] LOG:  terminating any other active =
server
> processes
>=20
> When there are several queries running simultaneously. Tried to get =
some
> info from coredump, but that's all i have:
>=20
> (gdb) bt
> #0  GetMemoryChunkContext (pointer=3D0x0) at
> ./build/../src/include/utils/memutils.h:127
> #1  pfree (pointer=3D0x0) at =
./build/../src/backend/utils/mmgr/mcxt.c:1033
> Backtrace stopped: Cannot access memory at address 0x7ffc990e7218
>=20