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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Daniel WM <dwilches@gmail.com>
cc: pgsql-bugs@lists.postgresql.org, Andres Freund <andres@anarazel.de>
Subject: Re: BUG #16293: postgres segfaults and returns SQLSTATE 08006
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Comments: In-reply-to Daniel WM <dwilches@gmail.com>
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Daniel WM <dwilches@gmail.com> writes:
> I have finally isolated the issue and I have a set of steps that reliabl=
y
> cause the segfault:

Interesting.  I do *not* see a crash in v12 or HEAD, but v11 gives
me an assertion failure:

TRAP: FailedAssertion("!(!slot->tts_fixedTupleDescriptor)", File: "execTup=
les.c", Line: 284)
2020-03-14 17:16:06.626 EDT [1101] LOG:  server process (PID 20822) was te=
rminated by signal 6: Aborted
2020-03-14 17:16:06.626 EDT [1101] DETAIL:  Failed process was running: IN=
SERT INTO parent_table VALUES ('2020-02-02 01:00:00+00:00', 'f');

here:

#3  0x000000000063ef45 in ExecSetSlotDescriptor (slot=3D0x1cf4060, =

    tupdesc=3D0x7f903a2dd0f8) at execTuples.c:284
#4  0x00000000006360eb in ExecConstraints (resultRelInfo=3D0x1cf47b8, =

    slot=3D0x1cf4060, estate=3D0x1cf3778) at execMain.c:2062
#5  0x000000000065a44d in ExecInsert (mtstate=3D0x1cf3ae0, slot=3D0x1cf406=
0, =

    planSlot=3D0x1cf4060, estate=3D0x1cf3778, canSetTag=3Dtrue)
    at nodeModifyTable.c:398
#6  0x000000000065b80b in ExecModifyTable (pstate=3D<value optimized out>)
    at nodeModifyTable.c:2159
#7  0x0000000000636c27 in ExecProcNode (queryDesc=3D0x1ce51e8, =

    direction=3D<value optimized out>, count=3D0, execute_once=3D224)
    at ../../../src/include/executor/executor.h:247
#8  ExecutePlan (queryDesc=3D0x1ce51e8, direction=3D<value optimized out>,=
 =

    count=3D0, execute_once=3D224) at execMain.c:1723
#9  standard_ExecutorRun (queryDesc=3D0x1ce51e8, =

    direction=3D<value optimized out>, count=3D0, execute_once=3D224)

So this looks like something to do with Andres' tupletableslot work.

			regards, tom lane