From: | Marco Boeringa <marco(at)boeringa(dot)demon(dot)nl> |
---|---|
To: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
Cc: | "andres(at)anarazel(dot)de >> Andres Freund" <andres(at)anarazel(dot)de>, Thom Brown <thom(at)linux(dot)com> |
Subject: | Re: Potential "AIO / io workers" inter-worker locking issue in PG18? |
Date: | 2025-10-07 19:49:14 |
Message-ID: | fbac4358-21de-4c25-b325-6bb07b8e8e15@boeringa.demon.nl |
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Lists: | pgsql-bugs |
Hi Andres,
Probably less useful, but just to further illustrate the issue, the
results op 'top' which shows multiple stuck postgress processes already
busy for hours and as written before all displaying as 'active' with no
wait events in pgAdmin:
top - 21:42:44 up 12:20, 2 users, load average: 16,14, 16,14, 16,09
Tasks: 664 total, 17 running, 647 sleeping, 0 stopped, 0 zombie
%Cpu(s): 37,0 us, 0,1 sy, 0,0 ni, 62,9 id, 0,0 wa, 0,0 hi, 0,0 si,
0,0 st
MiB Mem : 393429,0 total, 297340,0 free, 53521,1 used, 91791,0 buff/cache
MiB Swap: 153600,0 total, 153600,0 free, 0,0 used. 339907,9 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
118256 postgres 20 0 164,3g 994408 985600 R 100,0 0,2 309:57.22
postgres
118264 postgres 20 0 164,3g 1,0g 994,8m R 100,0 0,3 309:57.46
postgres
118367 postgres 20 0 164,3g 911516 907456 R 100,0 0,2 309:55.78
postgres
118368 postgres 20 0 164,3g 915388 911328 R 100,0 0,2 309:55.82
postgres
118369 postgres 20 0 164,3g 914684 910272 R 100,0 0,2 309:55.20
postgres
118372 postgres 20 0 164,3g 924188 916256 R 100,0 0,2 309:55.20
postgres
118254 postgres 20 0 164,3g 1,0g 1,0g R 99,9 0,3 309:52.71
postgres
118255 postgres 20 0 164,3g 993,6m 981,8m R 99,9 0,3 309:57.73
postgres
118259 postgres 20 0 164,3g 978,2m 988768 R 99,9 0,2 309:57.47
postgres
118261 postgres 20 0 164,3g 1,0g 987,2m R 99,9 0,3 309:57.52
postgres
118262 postgres 20 0 164,3g 998560 990176 R 99,9 0,2 309:57.04
postgres
118265 postgres 20 0 164,3g 1,0g 1,0g R 99,9 0,3 309:55.86
postgres
118365 postgres 20 0 164,3g 925244 917312 R 99,9 0,2 309:56.02
postgres
118366 postgres 20 0 164,3g 920668 912384 R 99,9 0,2 309:56.02
postgres
118370 postgres 20 0 164,3g 923132 915200 R 99,9 0,2 309:55.22
postgres
118373 postgres 20 0 164,3g 924188 916256 R 99,9 0,2 309:54.96
postgres
2546 ubuntu_+ 20 0 560524 266288 106704 S 21,8 0,1 7:48.62 Xorg
2954 ubuntu_+ 20 0 9050316 455464 167812 S 7,3 0,1 4:33.90
gnome-s+
1855 xrdp 20 0 133248 16344 8800 S 1,3 0,0 0:37.48 xrdp
4329 ubuntu_+ 20 0 851956 56648 43292 S 0,7 0,0 0:25.66
gnome-t+
123595 ubuntu_+ 20 0 14644 5632 3520 R 0,4 0,0 0:00.31 top
123432 root 20 0 0 0 0 I 0,2 0,0 0:00.09
kworker+
1385 polkitd 20 0 384600 9744 7392 S 0,1 0,0 0:01.92
polkitd
1982 gdm 20 0 8805756 237412 128832 S 0,1 0,1 1:20.05
gnome-s+
3259 ubuntu_+ 20 0 388852 11472 6688 S 0,1 0,0 0:08.03
ibus-da+
3368 ubuntu_+ 20 0 347872 30504 17556 S 0,1 0,0 0:03.70
ibus-ex+
3638 ubuntu_+ 20 0 236772 6688 6336 S 0,1 0,0 0:02.33
ibus-en+
30304 ubuntu_+ 20 0 6490464 271864 129800 S 0,1 0,1 0:23.91
nautilus
1 root 20 0 23892 13024 8800 S 0,0 0,0 0:04.11
systemd
2 root 20 0 0 0 0 S 0,0 0,0 0:00.04
kthreadd
3 root 20 0 0 0 0 S 0,0 0,0 0:00.00
pool_wo+
4 root 0 -20 0 0 0 I 0,0 0,0 0:00.00
kworker+
5 root 0 -20 0 0 0 I 0,0 0,0 0:00.00
kworker+
6 root 0 -20 0 0 0 I 0,0 0,0 0:00.00
kworker+
7 root 0 -20 0 0 0 I 0,0 0,0 0:00.00
kworker+
9 root 0 -20 0 0 0 I 0,0 0,0 0:00.00
kworker+
10 root 20 0 0 0 0 I 0,0 0,0 0:05.18
kworker+
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