From: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
---|---|
To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: TRAP: FailedAssertion("prev_first_lsn < cur_txn->first_lsn", File: "reorderbuffer.c", Line: 927, PID: 568639) |
Date: | 2023-06-06 09:00:00 |
Message-ID: | f158d9ca-2057-2836-a522-0b1278be5a53@gmail.com |
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Thread: | |
Lists: | pgsql-hackers |
Hello,
21.10.2022 08:49, Amit Kapila wrote:
> On Fri, Oct 21, 2022 at 8:01 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>> Thank you for the comment! I agreed with all comments and I've updated
>> patches accordingly.
>>
> Pushed after removing the test case from v11-13 branches as it is not
> relevant to those branches and the test-1 in
> catalog_change_snapshot.spec already tests the same case for those
> branches.
I've managed to get that assertion failure again (on master) while playing
with the concurrent installcheck. This can be easily reproduced with the
following script:
numclients=5
for ((c=1;c<=numclients;c++)); do
cp -r contrib/test_decoding contrib/test_decoding_$c
sed "s/isolation_slot/isolation_slot_$c/" -i contrib/test_decoding_$c/specs/catalog_change_snapshot.spec # Use
independent slots
sed "$(printf '$p; %.0s' `seq 50`)" -i contrib/test_decoding_$c/specs/catalog_change_snapshot.spec # Repeat the last
permutation 50 times
done
for ((c=1;c<=numclients;c++)); do
EXTRA_REGRESS_OPTS="--dbname=regress_$c" make -s installcheck-force -C contrib/test_decoding_$c USE_MODULE_DB=1
>"installcheck-$c.log" 2>&1 &
done
wait
grep 'TRAP:' server.log
Produces for me:
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794105
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794104
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794099
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794105
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794104
TRAP: failed Assert("prev_first_lsn < cur_txn->first_lsn"), File: "reorderbuffer.c", Line: 942, PID: 3794099
With the debug logging added inside AssertTXNLsnOrder() I see:
ctx->snapshot_builder->start_decoding_at: 209807224, ctx->reader->EndRecPtr: 210043072,
SnapBuildXactNeedsSkip(ctx->snapshot_builder, ctx->reader->EndRecPtr): 0
and inside the loop:
cur_txn->first_lsn: 209792872
cur_txn->first_lsn: 209975744
cur_txn->first_lsn: 210043008
cur_txn->first_lsn: 210043008
and it triggers the Assert.
Best regards,
Alexander
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