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From: surya poondla <suryapoondla4@gmail.com>
Date: Wed, 7 Jan 2026 22:52:10 -0800
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Message-ID: <CAOVWO5qufByqYyUS87X80-T=XDdMTaBNjqc9LNrXcCqYc8A5rQ@mail.gmail.com>
Subject: Re: BUG #19369: Not documented that io_uring on kernel versions
 between 5.1 and below 5.6 does not work
To: evsi@amazon.com, pgsql-bugs@lists.postgresql.org
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Hi Evan,

In my previous email/findings, I didn't compile postgres with the liburing
 option.

I did it this time and see the same symptoms as you saw.

surya@surya:~/pgdata18$ uname -r
5.4.0-216-generic
surya@surya:~/pgdata18$ uname -a
Linux surya 5.4.0-216-generic #236-Ubuntu SMP Fri Apr 11 19:55:34 UTC 2025
aarch64 aarch64 aarch64 GNU/Linux
surya@surya:~/pgdata18$
surya@surya:~/pgdata18$ ~/pg18/bin/pg_ctl -D ~/pgdata18 restart
waiting for server to shut down.... done
server stopped
waiting for server to start....2026-01-08 06:20:36.301 UTC [17042] LOG:
 redirecting log output to logging collector process
2026-01-08 06:20:36.301 UTC [17042] HINT:  Future log output will appear in
directory "log".
 done
server started
surya@surya:~/pgdata18$ ls log/
postgresql-2026-01-08_061910.log  postgresql-2026-01-08_062036.log
postgresql-2026-01-08_061955.log
surya@surya:~/pgdata18$ ~/pg18/bin/psql -d postgres
psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed:
FATAL:  could not read blocks 0..0 in file "global/1260": Invalid argument

In the logs, I see
026-01-08 06:24:29.858 UTC [17126] DEBUG:  InitPostgres
2026-01-08 06:24:29.858 UTC [17127] DEBUG:  logical replication launcher
started
2026-01-08 06:24:29.858 UTC [17127] DEBUG:  InitPostgres
2026-01-08 06:24:29.858 UTC [17126] DEBUG:  io 6400      |op invalid|target
invalid|state HANDED_OUT      : adding cb #1, id
2/aio_shared_buffer_readv_cb
2026-01-08 06:24:29.858 UTC [17126] DEBUG:  io 6400      |op invalid|target
smgr|state HANDED_OUT      : adding cb #2, id 1/aio_md_readv_cb
2026-01-08 06:24:29.858 UTC [17126] DEBUG:  io 6400      |op readv|target
smgr|state DEFINED         : calling cb #1
2/aio_shared_buffer_readv_cb->stage(0)
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  io 6400      |op readv|target
smgr|state STAGED          : staged (synchronous: 0, in_batch: 1)
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  io 6400      |op readv|target
smgr|state SUBMITTED       : wait_one io_gen: 1, ref_gen: 1, cycle 0
2026-01-08 06:24:29.859 UTC [17126] LOG:  could not read blocks 0..0 in
file "global/1262": Invalid argument
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  io 6400      |op readv|target
smgr|state COMPLETED_IO    : after shared completion: distilled result:
(status ERROR, id 1, error_data: 22, result 0), raw_result: -22
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  io 6400      |op readv|target
smgr|state COMPLETED_SHARED: after local completion: result: (status ERROR,
id 1, error_data 22, result 0), raw_result: -22
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  drained 1/1, now expecting 0
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  io 6400      |op invalid|target
invalid|state IDLE            : wait_one io_gen: 2, ref_gen: 1, cycle 0
2026-01-08 06:24:29.859 UTC [17126] DEBUG:  wait_one with 0 sleeps
2026-01-08 06:24:29.859 UTC [17126] ERROR:  could not read blocks 0..0 in
file "global/1262": Invalid argument
2026-01-08 06:24:30.859 UTC [17126] DEBUG:  io 6400      |op invalid|target
invalid|state HANDED_OUT      : adding cb #1, id
2/aio_shared_buffer_readv_cbhe logs

I will do some more testing on this and update my findings.

-Surya Poondla

On Wed, Jan 7, 2026 at 8:15=E2=80=AFPM surya poondla <suryapoondla4@gmail.c=
om>
wrote:

> Hi Evsi,
>
> I created a new Ubuntu server and am able to reproduce the same behavior
> you reported for Postgres 18.1 on aarch64 architecture.
>
> surya@surya:~/pgdata18/log$ uname -r
> 5.4.0-216-generic
> surya@surya:~/pgdata18/log$ uname -a
> Linux surya 5.4.0-216-generic #236-Ubuntu SMP Fri Apr 11 19:55:34 UTC 202=
5
> aarch64 aarch64 aarch64 GNU/Linux
>
> I did some testing and see the below
> In the postgresql.conf if I put
> io_method =3D 'worker' or io_method =3D 'sync', postgres is able to resta=
rt
> with no errors.
> But if io_method =3D 'io_uring' then I see the below on my console
>
> surya@surya:~/postgresql-18.1$ vim ~/pgdata18/postgresql.conf
> surya@surya:~/postgresql-18.1$ ~/pg18/bin/pg_ctl -D ~/pgdata18 restart
> waiting for server to shut down....2026-01-08 04:06:07.081 UTC [44973]
> DEBUG:  logger shutting down
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  shmem_exit(0): 0
> before_shmem_exit callbacks to make
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  shmem_exit(0): 0 on_shmem_exi=
t
> callbacks to make
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  proc_exit(0): 0 callbacks to
> make
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  exit(0)
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  shmem_exit(-1): 0
> before_shmem_exit callbacks to make
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  shmem_exit(-1): 0
> on_shmem_exit callbacks to make
> 2026-01-08 04:06:07.081 UTC [44973] DEBUG:  proc_exit(-1): 0 callbacks to
> make
>  done
> server stopped
> waiting for server to start....2026-01-08 04:06:07.172 GMT [44988] LOG:
>  invalid value for parameter "io_method": "io_uring"
> 2026-01-08 04:06:07.172 GMT [44988] HINT:  Available values: sync, worker=
.
> 2026-01-08 04:06:07.172 UTC [44988] FATAL:  configuration file
> "/home/surya/pgdata18/postgresql.conf" contains errors
> 2026-01-08 04:06:07.172 UTC [44988] DEBUG:  shmem_exit(1): 0
> before_shmem_exit callbacks to make
> 2026-01-08 04:06:07.172 UTC [44988] DEBUG:  shmem_exit(1): 0 on_shmem_exi=
t
> callbacks to make
> 2026-01-08 04:06:07.172 UTC [44988] DEBUG:  proc_exit(1): 0 callbacks to
> make
> 2026-01-08 04:06:07.172 UTC [44988] DEBUG:  exit(1)
>  stopped waiting
> pg_ctl: could not start server
> Examine the log output.
>
>
> From the above we can see that the stderr says that "*invalid value for
> parameter "io_method": "io_uring"*"
>
> And in the logs I see similar thing like you reported
> 2026-01-08 04:05:31.438 UTC [44972] DEBUG:  starting background worker
> process "logical replication launcher"
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  autovacuum launcher started
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  InitPostgres
> 2026-01-08 04:05:31.438 UTC [44982] DEBUG:  logical replication launcher
> started
> 2026-01-08 04:05:31.438 UTC [44982] DEBUG:  InitPostgres
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  io 6400      |op
> invalid|target invalid|state HANDED_OUT      : adding cb #1, id
> 2/aio_shared_buffer_readv_cb
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  io 6400      |op
> invalid|target smgr|state HANDED_OUT      : adding cb #2, id
> 1/aio_md_readv_cb
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  io 6400      |op readv|target
> smgr|state DEFINED         : calling cb #1
> 2/aio_shared_buffer_readv_cb->stage(0)
> 2026-01-08 04:05:31.438 UTC [44981] DEBUG:  io 6400      |op readv|target
> smgr|state STAGED          : staged (synchronous: 0, in_batch: 1)
> 2026-01-08 04:05:31.439 UTC [44974] DEBUG:  io 6400      |op readv|target
> smgr|state COMPLETED_IO    : after shared completion: distilled result:
> (status OK, id 0, error_data: 0, result 1), raw_result: 8192
> 2026-01-08 04:05:31.439 UTC [44981] DEBUG:  io 6400      |op readv|target
> smgr|state COMPLETED_SHARED: after local completion: result: (status OK, =
id
> 0, error_data 0, result 1), raw_result: 8192
>
> I am working on a patch and will fix the inconsistencies in documentation
> about io_uring.
>
> Best,
> Surya Poondla
>
> On Wed, Jan 7, 2026 at 7:54=E2=80=AFPM PG Bug reporting form <
> noreply@postgresql.org> wrote:
>
>> The following bug has been logged on the website:
>>
>> Bug reference:      19369
>> Logged by:          Evan Si
>> Email address:      evsi@amazon.com
>> PostgreSQL version: 18.1
>> Operating system:   Amazon Linux 2
>> Description:
>>
>> Hello,
>>
>> The documentation doesn't explicitly state a minimum kernel version for
>> io_uring, but in src/backend/storage/aio/README.md, it claims that:
>>
>> > io_method=3Dio_uring is available on Linux 5.1+.
>>
>> Attempting to set io_method to io_uring on versions without io_uring at
>> all
>> (below 5.1) causes the server to graciously report that "[the k]ernel do=
es
>> not support io_uring".
>> But setting io_uring on kernel versions between 5.1 and 5.6 sees the
>> server
>> start but connections failing with EINVAL.
>>
>> ```
>> [ec2-user@ip-172-31-56-49 postgres]$ psql postgres
>> psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed:
>> FATAL:  could not read blocks 0..0 in file "global/1260": Invalid argume=
nt
>> ```
>>
>> It seems like the implementation in postgres leverages non-vectored I/O
>> (i.e. io_uring_prep_read and io_uring_prep_write) in
>> src/backend/storage/aio/method_io_uring.c.
>>
>> But, these opcodes aren't actually available until kernel 5.6
>> (https://github.com/axboe/liburing/issues/44),
>> (https://man7.org/linux/man-pages/man2/io_uring_enter.2.html - under
>> IORING_OP_READ, IORING_OP_WRITE).
>>
>> It seems kernel 5.4 LTS ended last month, but this seems worth
>> clarifying, I
>> think.
>>
>> --
>>
>> Precise reproduction example:
>>
>> OS details
>> ```
>> [ec2-user@ip-172-31-56-49 postgres]$ uname -a
>> Linux ip-172-31-56-49.us-west-2.compute.internal
>> 5.4.301-221.450.amzn2.x86_64 #1 SMP Tue Nov 18 16:40:04 UTC 2025 x86_64
>> x86_64 x86_64 GNU/Linux
>> ```
>>
>> Build postgres with liburing 2.8, set postgresql.conf with
>> io_method=3Dio_uring, log_min_messages =3D debug3.
>>
>> Postgres starts without complaint, but trying to connect will fail:
>>
>> ```
>> [ec2-user@ip-172-31-56-49 postgres]$ psql postgres
>> psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed:
>> FATAL:  could not read blocks 0..0 in file "global/1260": Invalid argume=
nt
>> ```
>> Inside logfile:
>> ```
>> 2026-01-02 22:35:43.862 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> invalid|state HANDED_OUT      : adding cb #1, id
>> 2/aio_shared_buffer_readv_cb
>> 2026-01-02 22:35:43.862 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> smgr|state HANDED_OUT      : adding cb #2, id 1/aio_md_readv_cb
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state DEFINED         : calling cb #1
>> 2/aio_shared_buffer_readv_cb->stage(0)
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state STAGED          : staged (synchronous: 0, in_batch: 1)
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state SUBMITTED       : wait_one io_gen: 3, ref_gen: 3, cycle 0
>> 2026-01-02 22:35:43.863 UTC [8517] LOG:  could not read blocks 0..0 in
>> file
>> "global/1262": Invalid argument
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state COMPLETED_IO    : after shared completion: distilled result:
>> (status ERROR, id 1, error_data: 22, result 0), raw_result: -22
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state COMPLETED_SHARED: after local completion: result: (status
>> ERROR,
>> id 1, error_data 22, result 0), raw_result: -22
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  drained 1/1, now expecting 0
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> invalid|state IDLE            : wait_one io_gen: 4, ref_gen: 3, cycle 0
>> 2026-01-02 22:35:43.863 UTC [8517] DEBUG:  wait_one with 0 sleeps
>> 2026-01-02 22:35:43.863 UTC [8517] ERROR:  could not read blocks 0..0 in
>> file "global/1262": Invalid argument
>> 2026-01-02 22:35:44.057 UTC [8512] DEBUG:  assigned pm child slot 1 for
>> backend
>> 2026-01-02 22:35:44.058 UTC [8512] DEBUG:  forked new client backend,
>> pid=3D8521 socket=3D151
>> 2026-01-02 22:35:44.058 UTC [8521] DEBUG:  InitPostgres
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op invalid|targ=
et
>> invalid|state HANDED_OUT      : adding cb #1, id
>> 2/aio_shared_buffer_readv_cb
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op invalid|targ=
et
>> smgr|state HANDED_OUT      : adding cb #2, id 1/aio_md_readv_cb
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op readv|target
>> smgr|state DEFINED         : calling cb #1
>> 2/aio_shared_buffer_readv_cb->stage(0)
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op readv|target
>> smgr|state STAGED          : staged (synchronous: 0, in_batch: 1)
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op readv|target
>> smgr|state SUBMITTED       : wait_one io_gen: 1, ref_gen: 1, cycle 0
>> 2026-01-02 22:35:44.059 UTC [8521] LOG:  could not read blocks 0..0 in
>> file
>> "global/1260": Invalid argument
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op readv|target
>> smgr|state COMPLETED_IO    : after shared completion: distilled result:
>> (status ERROR, id 1, error_data: 22, result 0), raw_result: -22
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op readv|target
>> smgr|state COMPLETED_SHARED: after local completion: result: (status
>> ERROR,
>> id 1, error_data 22, result 0), raw_result: -22
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  drained 1/1, now expecting 0
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  io 0         |op invalid|targ=
et
>> invalid|state IDLE            : wait_one io_gen: 2, ref_gen: 1, cycle 0
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  wait_one with 0 sleeps
>> 2026-01-02 22:35:44.059 UTC [8521] FATAL:  could not read blocks 0..0 in
>> file "global/1260": Invalid argument
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  shmem_exit(1): 5
>> before_shmem_exit callbacks to make
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  shmem_exit(1): 7 on_shmem_exi=
t
>> callbacks to make
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  proc_exit(1): 2 callbacks to
>> make
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  exit(1)
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  shmem_exit(-1): 0
>> before_shmem_exit callbacks to make
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  shmem_exit(-1): 0 on_shmem_ex=
it
>> callbacks to make
>> 2026-01-02 22:35:44.059 UTC [8521] DEBUG:  proc_exit(-1): 0 callbacks to
>> make
>> 2026-01-02 22:35:44.060 UTC [8512] DEBUG:  releasing pm child slot 1
>> 2026-01-02 22:35:44.060 UTC [8512] DEBUG:  client backend (PID 8521)
>> exited
>> with exit code 1
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> invalid|state HANDED_OUT      : adding cb #1, id
>> 2/aio_shared_buffer_readv_cb
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> smgr|state HANDED_OUT      : adding cb #2, id 1/aio_md_readv_cb
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state DEFINED         : calling cb #1
>> 2/aio_shared_buffer_readv_cb->stage(0)
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state STAGED          : staged (synchronous: 0, in_batch: 1)
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state SUBMITTED       : wait_one io_gen: 4, ref_gen: 4, cycle 0
>> 2026-01-02 22:35:44.863 UTC [8517] LOG:  could not read blocks 0..0 in
>> file
>> "global/1262": Invalid argument
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state COMPLETED_IO    : after shared completion: distilled result:
>> (status ERROR, id 1, error_data: 22, result 0), raw_result: -22
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op readv|target
>> smgr|state COMPLETED_SHARED: after local completion: result: (status
>> ERROR,
>> id 1, error_data 22, result 0), raw_result: -22
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  drained 1/1, now expecting 0
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  io 6400      |op invalid|targ=
et
>> invalid|state IDLE            : wait_one io_gen: 5, ref_gen: 4, cycle 0
>> 2026-01-02 22:35:44.863 UTC [8517] DEBUG:  wait_one with 0 sleeps
>> 2026-01-02 22:35:44.863 UTC [8517] ERROR:  could not read blocks 0..0 in
>> file "global/1262": Invalid argument
>> ```
>>
>>

--000000000000b6ea470647dad989
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Evan,<br><br>In my previous email/findings, I didn&#39;=
t compile postgres with the=C2=A0<span style=3D"font-family:&quot;Helvetica=
 Neue&quot;;font-size:13px">liburing</span>=C2=A0option.<br><br>I did it th=
is time and see the same symptoms as you saw.<br><br>surya@surya:~/pgdata18=
$ uname -r<br>5.4.0-216-generic<br>surya@surya:~/pgdata18$ uname -a<br>Linu=
x surya 5.4.0-216-generic #236-Ubuntu SMP Fri Apr 11 19:55:34 UTC 2025 aarc=
h64 aarch64 aarch64 GNU/Linux<br>surya@surya:~/pgdata18$ <br>surya@surya:~/=
pgdata18$ ~/pg18/bin/pg_ctl -D ~/pgdata18 restart<br>waiting for server to =
shut down.... done<br>server stopped<br>waiting for server to start....2026=
-01-08 06:20:36.301 UTC [17042] LOG: =C2=A0redirecting log output to loggin=
g collector process<br>2026-01-08 06:20:36.301 UTC [17042] HINT: =C2=A0Futu=
re log output will appear in directory &quot;log&quot;.<br>=C2=A0done<br>se=
rver started<br>surya@surya:~/pgdata18$ ls log/<br>postgresql-2026-01-08_06=
1910.log =C2=A0postgresql-2026-01-08_062036.log<br>postgresql-2026-01-08_06=
1955.log<br>surya@surya:~/pgdata18$ ~/pg18/bin/psql -d postgres<br>psql: er=
ror: connection to server on socket &quot;/tmp/.s.PGSQL.5432&quot; failed: =
FATAL: =C2=A0could not read blocks 0..0 in file &quot;global/1260&quot;: In=
valid argument<br><br>In the logs, I see<br>026-01-08 06:24:29.858 UTC [171=
26] DEBUG: =C2=A0InitPostgres<br>2026-01-08 06:24:29.858 UTC [17127] DEBUG:=
 =C2=A0logical replication launcher started<br>2026-01-08 06:24:29.858 UTC =
[17127] DEBUG: =C2=A0InitPostgres<br>2026-01-08 06:24:29.858 UTC [17126] DE=
BUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op invalid|target invalid|state HAN=
DED_OUT =C2=A0 =C2=A0 =C2=A0: adding cb #1, id 2/aio_shared_buffer_readv_cb=
<br>2026-01-08 06:24:29.858 UTC [17126] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =
=C2=A0|op invalid|target smgr|state HANDED_OUT =C2=A0 =C2=A0 =C2=A0: adding=
 cb #2, id 1/aio_md_readv_cb<br>2026-01-08 06:24:29.858 UTC [17126] DEBUG: =
=C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op readv|target smgr|state DEFINED =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 : calling cb #1 2/aio_shared_buffer_readv_cb-&gt;s=
tage(0)<br>2026-01-08 06:24:29.859 UTC [17126] DEBUG: =C2=A0io 6400 =C2=A0 =
=C2=A0 =C2=A0|op readv|target smgr|state STAGED =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0: staged (synchronous: 0, in_batch: 1)<br>2026-01-08 06:24:29.859 UT=
C [17126] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op readv|target smgr|st=
ate SUBMITTED =C2=A0 =C2=A0 =C2=A0 : wait_one io_gen: 1, ref_gen: 1, cycle =
0<br>2026-01-08 06:24:29.859 UTC [17126] LOG: =C2=A0could not read blocks 0=
..0 in file &quot;global/1262&quot;: Invalid argument<br>2026-01-08 06:24:2=
9.859 UTC [17126] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op readv|target=
 smgr|state COMPLETED_IO =C2=A0 =C2=A0: after shared completion: distilled =
result: (status ERROR, id 1, error_data: 22, result 0), raw_result: -22<br>=
2026-01-08 06:24:29.859 UTC [17126] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=
=A0|op readv|target smgr|state COMPLETED_SHARED: after local completion: re=
sult: (status ERROR, id 1, error_data 22, result 0), raw_result: -22<br>202=
6-01-08 06:24:29.859 UTC [17126] DEBUG: =C2=A0drained 1/1, now expecting 0<=
br>2026-01-08 06:24:29.859 UTC [17126] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =
=C2=A0|op invalid|target invalid|state IDLE =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0: wait_one io_gen: 2, ref_gen: 1, cycle 0<br>2026-01-08 06:24:29.=
859 UTC [17126] DEBUG: =C2=A0wait_one with 0 sleeps<br>2026-01-08 06:24:29.=
859 UTC [17126] ERROR: =C2=A0could not read blocks 0..0 in file &quot;globa=
l/1262&quot;: Invalid argument<br>2026-01-08 06:24:30.859 UTC [17126] DEBUG=
: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op invalid|target invalid|state HANDED=
_OUT =C2=A0 =C2=A0 =C2=A0: adding cb #1, id 2/aio_shared_buffer_readv_cbhe =
logs<br><br>I will do some more testing on this and update my findings.<div=
><br></div><div>-Surya Poondla</div></div><br><div class=3D"gmail_quote gma=
il_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jan 7, 20=
26 at 8:15=E2=80=AFPM surya poondla &lt;<a href=3D"mailto:suryapoondla4@gma=
il.com">suryapoondla4@gmail.com</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr">Hi Evsi,<br><br>I created a new Ubuntu server and=C2=A0am able to =
reproduce the same behavior you=C2=A0reported for Postgres 18.1 on aarch64 =
architecture.<br><br>surya@surya:~/pgdata18/log$ uname -r<br>5.4.0-216-gene=
ric<br>surya@surya:~/pgdata18/log$ uname -a<br>Linux surya 5.4.0-216-generi=
c #236-Ubuntu SMP Fri Apr 11 19:55:34 UTC 2025 aarch64 aarch64 aarch64 GNU/=
Linux<br><br>I did some testing and see the=C2=A0below<br>In the=C2=A0postg=
resql.conf if I put=C2=A0<br>io_method =3D &#39;worker&#39; or=C2=A0io_meth=
od =3D &#39;sync&#39;, postgres is able to restart with no errors.<br>But i=
f=C2=A0io_method =3D &#39;io_uring&#39; then I see the below on my console<=
br><br></div><div>surya@surya:~/postgresql-18.1$ vim ~/pgdata18/postgresql.=
conf</div>surya@surya:~/postgresql-18.1$ ~/pg18/bin/pg_ctl -D ~/pgdata18 re=
start<br>waiting for server to shut down....2026-01-08 04:06:07.081 UTC [44=
973] DEBUG: =C2=A0logger shutting down<br>2026-01-08 04:06:07.081 UTC [4497=
3] DEBUG: =C2=A0shmem_exit(0): 0 before_shmem_exit callbacks to make<br>202=
6-01-08 04:06:07.081 UTC [44973] DEBUG: =C2=A0shmem_exit(0): 0 on_shmem_exi=
t callbacks to make<br>2026-01-08 04:06:07.081 UTC [44973] DEBUG: =C2=A0pro=
c_exit(0): 0 callbacks to make<br>2026-01-08 04:06:07.081 UTC [44973] DEBUG=
: =C2=A0exit(0)<br>2026-01-08 04:06:07.081 UTC [44973] DEBUG: =C2=A0shmem_e=
xit(-1): 0 before_shmem_exit callbacks to make<br>2026-01-08 04:06:07.081 U=
TC [44973] DEBUG: =C2=A0shmem_exit(-1): 0 on_shmem_exit callbacks to make<b=
r>2026-01-08 04:06:07.081 UTC [44973] DEBUG: =C2=A0proc_exit(-1): 0 callbac=
ks to make<br>=C2=A0done<br>server stopped<br>waiting for server to start..=
..2026-01-08 04:06:07.172 GMT [44988] LOG: =C2=A0invalid value for paramete=
r &quot;io_method&quot;: &quot;io_uring&quot;<br>2026-01-08 04:06:07.172 GM=
T [44988] HINT: =C2=A0Available values: sync, worker.<br>2026-01-08 04:06:0=
7.172 UTC [44988] FATAL: =C2=A0configuration file &quot;/home/surya/pgdata1=
8/postgresql.conf&quot; contains errors<br>2026-01-08 04:06:07.172 UTC [449=
88] DEBUG: =C2=A0shmem_exit(1): 0 before_shmem_exit callbacks to make<br>20=
26-01-08 04:06:07.172 UTC [44988] DEBUG: =C2=A0shmem_exit(1): 0 on_shmem_ex=
it callbacks to make<br>2026-01-08 04:06:07.172 UTC [44988] DEBUG: =C2=A0pr=
oc_exit(1): 0 callbacks to make<br>2026-01-08 04:06:07.172 UTC [44988] DEBU=
G: =C2=A0exit(1)<br>=C2=A0stopped waiting<br>pg_ctl: could not start server=
<br>Examine the log output.<br><br><br>From the above we can see that the s=
tderr says that &quot;<i><b>invalid value for parameter &quot;io_method&quo=
t;: &quot;io_uring&quot;</b></i>&quot;<br><br>And in the logs I see similar=
 thing like you reported<br>2026-01-08 04:05:31.438 UTC [44972] DEBUG: =C2=
=A0starting background worker process &quot;logical replication launcher&qu=
ot;<br>2026-01-08 04:05:31.438 UTC [44981] DEBUG: =C2=A0autovacuum launcher=
 started<br>2026-01-08 04:05:31.438 UTC [44981] DEBUG: =C2=A0InitPostgres<b=
r>2026-01-08 04:05:31.438 UTC [44982] DEBUG: =C2=A0logical replication laun=
cher started<br>2026-01-08 04:05:31.438 UTC [44982] DEBUG: =C2=A0InitPostgr=
es<br>2026-01-08 04:05:31.438 UTC [44981] DEBUG: =C2=A0io 6400 =C2=A0 =C2=
=A0 =C2=A0|op invalid|target invalid|state HANDED_OUT =C2=A0 =C2=A0 =C2=A0:=
 adding cb #1, id 2/aio_shared_buffer_readv_cb<br>2026-01-08 04:05:31.438 U=
TC [44981] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op invalid|target smgr=
|state HANDED_OUT =C2=A0 =C2=A0 =C2=A0: adding cb #2, id 1/aio_md_readv_cb<=
br>2026-01-08 04:05:31.438 UTC [44981] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =
=C2=A0|op readv|target smgr|state DEFINED =C2=A0 =C2=A0 =C2=A0 =C2=A0 : cal=
ling cb #1 2/aio_shared_buffer_readv_cb-&gt;stage(0)<br>2026-01-08 04:05:31=
.438 UTC [44981] DEBUG: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op readv|target =
smgr|state STAGED =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: staged (synchronous: =
0, in_batch: 1)<br>2026-01-08 04:05:31.439 UTC [44974] DEBUG: =C2=A0io 6400=
 =C2=A0 =C2=A0 =C2=A0|op readv|target smgr|state COMPLETED_IO =C2=A0 =C2=A0=
: after shared completion: distilled result: (status OK, id 0, error_data: =
0, result 1), raw_result: 8192<br>2026-01-08 04:05:31.439 UTC [44981] DEBUG=
: =C2=A0io 6400 =C2=A0 =C2=A0 =C2=A0|op readv|target smgr|state COMPLETED_S=
HARED: after local completion: result: (status OK, id 0, error_data 0, resu=
lt 1), raw_result: 8192<br><br>I am working on a patch=C2=A0and will fix th=
e inconsistencies in documentation about io_uring.<br><br>Best,<br>Surya Po=
ondla</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Wed, Jan 7, 2026 at 7:54=E2=80=AFPM PG Bug reporting form &lt=
;<a href=3D"mailto:noreply@postgresql.org" target=3D"_blank">noreply@postgr=
esql.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">The following bug has been logged on the website:<br>
<br>
Bug reference:=C2=A0 =C2=A0 =C2=A0 19369<br>
Logged by:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Evan Si<br>
Email address:=C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:evsi@amazon.com" targe=
t=3D"_blank">evsi@amazon.com</a><br>
PostgreSQL version: 18.1<br>
Operating system:=C2=A0 =C2=A0Amazon Linux 2<br>
Description:=C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>
<br>
Hello,<br>
<br>
The documentation doesn&#39;t explicitly state a minimum kernel version for=
<br>
io_uring, but in src/backend/storage/aio/README.md, it claims that:<br>
<br>
&gt; io_method=3Dio_uring is available on Linux 5.1+.<br>
<br>
Attempting to set io_method to io_uring on versions without io_uring at all=
<br>
(below 5.1) causes the server to graciously report that &quot;[the k]ernel =
does<br>
not support io_uring&quot;.<br>
But setting io_uring on kernel versions between 5.1 and 5.6 sees the server=
<br>
start but connections failing with EINVAL.<br>
<br>
```<br>
[ec2-user@ip-172-31-56-49 postgres]$ psql postgres<br>
psql: error: connection to server on socket &quot;/tmp/.s.PGSQL.5432&quot; =
failed:<br>
FATAL:=C2=A0 could not read blocks 0..0 in file &quot;global/1260&quot;: In=
valid argument<br>
```<br>
<br>
It seems like the implementation in postgres leverages non-vectored I/O<br>
(i.e. io_uring_prep_read and io_uring_prep_write) in<br>
src/backend/storage/aio/method_io_uring.c.<br>
<br>
But, these opcodes aren&#39;t actually available until kernel 5.6<br>
(<a href=3D"https://github.com/axboe/liburing/issues/44" rel=3D"noreferrer"=
 target=3D"_blank">https://github.com/axboe/liburing/issues/44</a>),<br>
(<a href=3D"https://man7.org/linux/man-pages/man2/io_uring_enter.2.html" re=
l=3D"noreferrer" target=3D"_blank">https://man7.org/linux/man-pages/man2/io=
_uring_enter.2.html</a> - under<br>
IORING_OP_READ, IORING_OP_WRITE).<br>
<br>
It seems kernel 5.4 LTS ended last month, but this seems worth clarifying, =
I<br>
think.<br>
<br>
--<br>
<br>
Precise reproduction example:<br>
<br>
OS details<br>
```<br>
[ec2-user@ip-172-31-56-49 postgres]$ uname -a<br>
Linux ip-172-31-56-49.us-west-2.compute.internal<br>
5.4.301-221.450.amzn2.x86_64 #1 SMP Tue Nov 18 16:40:04 UTC 2025 x86_64<br>
x86_64 x86_64 GNU/Linux<br>
```<br>
<br>
Build postgres with liburing 2.8, set postgresql.conf with<br>
io_method=3Dio_uring, log_min_messages =3D debug3.<br>
<br>
Postgres starts without complaint, but trying to connect will fail:<br>
<br>
```<br>
[ec2-user@ip-172-31-56-49 postgres]$ psql postgres<br>
psql: error: connection to server on socket &quot;/tmp/.s.PGSQL.5432&quot; =
failed:<br>
FATAL:=C2=A0 could not read blocks 0..0 in file &quot;global/1260&quot;: In=
valid argument<br>
```<br>
Inside logfile:<br>
```<br>
2026-01-02 22:35:43.862 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
invalid|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #1, id<br>
2/aio_shared_buffer_readv_cb<br>
2026-01-02 22:35:43.862 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
smgr|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #2, id 1/aio_md_readv=
_cb<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state DEFINED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: calling cb #1<br>
2/aio_shared_buffer_readv_cb-&gt;stage(0)<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state STAGED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : staged (synchronous: =
0, in_batch: 1)<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state SUBMITTED=C2=A0 =C2=A0 =C2=A0 =C2=A0: wait_one io_gen: 3, ref_ge=
n: 3, cycle 0<br>
2026-01-02 22:35:43.863 UTC [8517] LOG:=C2=A0 could not read blocks 0..0 in=
 file<br>
&quot;global/1262&quot;: Invalid argument<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state COMPLETED_IO=C2=A0 =C2=A0 : after shared completion: distilled r=
esult:<br>
(status ERROR, id 1, error_data: 22, result 0), raw_result: -22<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state COMPLETED_SHARED: after local completion: result: (status ERROR,=
<br>
id 1, error_data 22, result 0), raw_result: -22<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 drained 1/1, now expecting =
0<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
invalid|state IDLE=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : wait_one io_g=
en: 4, ref_gen: 3, cycle 0<br>
2026-01-02 22:35:43.863 UTC [8517] DEBUG:=C2=A0 wait_one with 0 sleeps<br>
2026-01-02 22:35:43.863 UTC [8517] ERROR:=C2=A0 could not read blocks 0..0 =
in<br>
file &quot;global/1262&quot;: Invalid argument<br>
2026-01-02 22:35:44.057 UTC [8512] DEBUG:=C2=A0 assigned pm child slot 1 fo=
r<br>
backend<br>
2026-01-02 22:35:44.058 UTC [8512] DEBUG:=C2=A0 forked new client backend,<=
br>
pid=3D8521 socket=3D151<br>
2026-01-02 22:35:44.058 UTC [8521] DEBUG:=C2=A0 InitPostgres<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op invalid|target<br>
invalid|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #1, id<br>
2/aio_shared_buffer_readv_cb<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op invalid|target<br>
smgr|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #2, id 1/aio_md_readv=
_cb<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op readv|target<br>
smgr|state DEFINED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: calling cb #1<br>
2/aio_shared_buffer_readv_cb-&gt;stage(0)<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op readv|target<br>
smgr|state STAGED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : staged (synchronous: =
0, in_batch: 1)<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op readv|target<br>
smgr|state SUBMITTED=C2=A0 =C2=A0 =C2=A0 =C2=A0: wait_one io_gen: 1, ref_ge=
n: 1, cycle 0<br>
2026-01-02 22:35:44.059 UTC [8521] LOG:=C2=A0 could not read blocks 0..0 in=
 file<br>
&quot;global/1260&quot;: Invalid argument<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op readv|target<br>
smgr|state COMPLETED_IO=C2=A0 =C2=A0 : after shared completion: distilled r=
esult:<br>
(status ERROR, id 1, error_data: 22, result 0), raw_result: -22<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op readv|target<br>
smgr|state COMPLETED_SHARED: after local completion: result: (status ERROR,=
<br>
id 1, error_data 22, result 0), raw_result: -22<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 drained 1/1, now expecting =
0<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 io 0=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0|op invalid|target<br>
invalid|state IDLE=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : wait_one io_g=
en: 2, ref_gen: 1, cycle 0<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 wait_one with 0 sleeps<br>
2026-01-02 22:35:44.059 UTC [8521] FATAL:=C2=A0 could not read blocks 0..0 =
in<br>
file &quot;global/1260&quot;: Invalid argument<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 shmem_exit(1): 5<br>
before_shmem_exit callbacks to make<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 shmem_exit(1): 7 on_shmem_e=
xit<br>
callbacks to make<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 proc_exit(1): 2 callbacks t=
o make<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 exit(1)<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 shmem_exit(-1): 0<br>
before_shmem_exit callbacks to make<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 shmem_exit(-1): 0 on_shmem_=
exit<br>
callbacks to make<br>
2026-01-02 22:35:44.059 UTC [8521] DEBUG:=C2=A0 proc_exit(-1): 0 callbacks =
to<br>
make<br>
2026-01-02 22:35:44.060 UTC [8512] DEBUG:=C2=A0 releasing pm child slot 1<b=
r>
2026-01-02 22:35:44.060 UTC [8512] DEBUG:=C2=A0 client backend (PID 8521) e=
xited<br>
with exit code 1<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
invalid|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #1, id<br>
2/aio_shared_buffer_readv_cb<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
smgr|state HANDED_OUT=C2=A0 =C2=A0 =C2=A0 : adding cb #2, id 1/aio_md_readv=
_cb<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state DEFINED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: calling cb #1<br>
2/aio_shared_buffer_readv_cb-&gt;stage(0)<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state STAGED=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : staged (synchronous: =
0, in_batch: 1)<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state SUBMITTED=C2=A0 =C2=A0 =C2=A0 =C2=A0: wait_one io_gen: 4, ref_ge=
n: 4, cycle 0<br>
2026-01-02 22:35:44.863 UTC [8517] LOG:=C2=A0 could not read blocks 0..0 in=
 file<br>
&quot;global/1262&quot;: Invalid argument<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state COMPLETED_IO=C2=A0 =C2=A0 : after shared completion: distilled r=
esult:<br>
(status ERROR, id 1, error_data: 22, result 0), raw_result: -22<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op readv|target<br>
smgr|state COMPLETED_SHARED: after local completion: result: (status ERROR,=
<br>
id 1, error_data 22, result 0), raw_result: -22<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 drained 1/1, now expecting =
0<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 io 6400=C2=A0 =C2=A0 =C2=A0=
 |op invalid|target<br>
invalid|state IDLE=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : wait_one io_g=
en: 5, ref_gen: 4, cycle 0<br>
2026-01-02 22:35:44.863 UTC [8517] DEBUG:=C2=A0 wait_one with 0 sleeps<br>
2026-01-02 22:35:44.863 UTC [8517] ERROR:=C2=A0 could not read blocks 0..0 =
in<br>
file &quot;global/1262&quot;: Invalid argument<br>
```<br>
<br>
</blockquote></div>
</blockquote></div>

--000000000000b6ea470647dad989--