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From: Xuneng Zhou <xunengzhou@gmail.com>
Date: Tue, 2 Jun 2026 14:00:29 +0800
Message-ID: 
 <CABPTF7VyH1-W2xnDspECDEzFGQj=WTFpZBCqKfM11OAZa6gQHQ@mail.gmail.com>
Subject: Re: Fix race in ReplicationSlotRelease for ephemeral slots
To: "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>,
 Fujii Masao <masao.fujii@gmail.com>
Cc: Srinath Reddy Sadipiralla <srinath2133@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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Content-Type: text/plain; charset="UTF-8"
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Hi,

On Sat, May 30, 2026 at 4:14=E2=80=AFPM Zhijie Hou (Fujitsu)
<houzj.fnst@fujitsu.com> wrote:
>
> On Saturday, May 30, 2026 1:44 AM Srinath Reddy Sadipiralla <srinath2133@=
gmail.com>  wrote:
>
> > > On Wed, May 27, 2026 at 5:20=E2=80=AFPM Zhijie Hou (Fujitsu) <mailto:=
houzj.fnst@fujitsu.com> wrote:
> > > I haven't attached a test for this fix, as the change is straightforw=
ard and the
> > > Likelihood of encountering this bug is low, so it may not be worth ad=
ding test
> > > cycles for it. However, if others feel differently, I'm OK to add one=
.
> >
> > +1 for a test. The fix is just an else, so a future refactor could chan=
ge it and silently
> > reintroduce the corruption, since it scribbles on an unrelated reused s=
lot, nothing
> > would catch it. Injection points make it deterministic; I've attached a=
 diff patch that adds
> > a test that fails without the fix and passes with it.
>
> Thanks for the test.
>
> I'm not sure if adding an injection point for this rare case is worthwhil=
e. Even
> if we were to add one, future refactoring of that function could shift th=
e
> position of the injection point, so its long-term usefulness is uncertain=
. I
> don't have a strong opinion on this, so I'll leave it to Fujii-San to dec=
ide.

Thanks for reporting this issue. I can reproduce it with lldb on Mac.

postgres=3D# SELECT pg_create_logical_replication_slot(
postgres(#     'test_slot_dropped',
postgres(#     'pgoutput2',
postgres(#     false,
postgres(#     false,
postgres(#     true
postgres(# );
ERROR:  could not access file "pgoutput2": No such file or directory


   787 * decoding be disabled.
   788 */
   789 ReplicationSlotDropAcquired(is_logical);
-> 790 }
   791
   792 /*
   793 * If slot needed to temporarily restrain both data and catalog xmin =
to
Target 0: (postgres) stopped.
(lldb) expr -- slot->data.name.data
(char[64]) $0 =3D "test_slot_created"
(lldb) expr -- slot->data.persistency
(ReplicationSlotPersistency) $1 =3D RS_PERSISTENT
(lldb) expr -- slot->active_proc
(ProcNumber) $2 =3D 126

The fix looks good to me.

There's an adjacent bug around drop_local_obsolete_slots. The root
cause of them looks similar -- ReplicationSlot * is a pointer to a
reusable shared-memory array cell, not a durable identity for the same
slot. In drop_local_obsolete_slots, the issue is that the slot has
been freed after ReplicationSlotDropAcquired(false); however, another
backend may reuse the same cell before the unlock/log reads. This
seems less severe -- it does not normally corrupt slot state, because
the code only read after the drop. But it can still unlock/log
misusing the identity of a different slot. Attached a test using
injection point to reproduce it and a patch to fix it.

--
Regards,
Xuneng Zhou
HighGo Software Co., Ltd.

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