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bcmills opened this issue Oct 28, 2020 · 4 comments
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database/sql: failures in TestTxStmtDeadlock starting Oct. 28 #42259

bcmills opened this issue Oct 28, 2020 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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Go1.16

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@bcmills
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bcmills commented Oct 28, 2020 •
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--- FAIL: TestTxStmtDeadlock (0.01s)
    sql_test.go:2835: unexpected error while executing stmt, err: sql: statement is closed
FAIL
FAIL	database/sql	0.624s

Possibly due to CL 250178 (@tz70s, @odeke-em @kardianos).
(Possibly another deadlock similar to the one fixed in that CL.)

Marking as release-blocker because deadlock and test-regression.

2020-10-28T19:19:04-bc0d7fd/freebsd-amd64-12_0
2020-10-28T16:55:17-d4c1ad8/openbsd-386-64
@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker labels Oct 28, 2020
@bcmills bcmills added this to the Go1.16 milestone Oct 28, 2020
@kardianos
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@bcmills Sorry. My fault. I'll look into ASAP.

@gopherbot
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Change https://golang.org/cl/266097 mentions this issue: database/sql: fix TestTxStmtDeadlock test

@tz70s
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tz70s commented Oct 28, 2020 •
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Yes sorry was due to one error check I wasn't aware of, the test was introduced by that CL as well instead of existing regression.

@gopherbot
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Change https://golang.org/cl/284513 mentions this issue: [release-branch.go1.15] database/sql: fix tx stmt deadlock when rollback

gopherbot pushed a commit that referenced this issue Mar 30, 2021
@odeke-em @dmitshur
[release-branch.go1.15] database/sql: fix tx stmt deadlock when rollback
c77418f 
Tx acquires tx.closemu W-lock and then acquires stmt.closemu.W-lock
to fully close the transaction and associated prepared statement.
Stmt query and execution run in reverse ways - acquires
stmt.closemu.R-lock and then acquires tx.closemu.R-lock to grab tx
connection, which may cause deadlock.

Prevent the lock is held around tx.closePrepared to ensure no
deadlock happens.

Includes a test fix from CL 266097.
Fixes #42884
Updates #40985
Updates #42259

Change-Id: Id52737660ada3cebdfff6efc23366cdc3224b8e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/250178
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
(cherry picked from commit d4c1ad8)
Reviewed-on: https://go-review.googlesource.com/c/go/+/284513
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This was referenced Jun 16, 2021
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