Re: possible memory leak in client/fuse mount

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Hi,

I checked the statedump and found some very high memory allocations.
grep -rwn "num_allocs" glusterdump.17317.dump.1605* | cut -d'=' -f2 | sort

30003616
30003616
3305
3305
36960008
36960008
38029944
38029944
38450472
38450472
39566824
39566824
4
I did check the lines on statedump and it could be happening in protocol/clinet. However, I did not find anything suspicious in my quick code exploration.
I would suggest to upgrade all the nodes on latest version and the start your work and see if there is any high usage of memory .
That way it will also be easier to debug this issue.

---
Ashish


From: "Olaf Buitelaar" <olaf.buitelaar@xxxxxxxxx>
To: "gluster-users" <gluster-users@xxxxxxxxxxx>
Sent: Thursday, November 19, 2020 10:28:57 PM
Subject: possible memory leak in client/fuse mount

Dear Gluster Users,

I've a glusterfs process which consumes about all memory of the machine (~58GB);

# ps -faxu|grep 17317
root     17317  3.1 88.9 59695516 58479708 ?   Ssl  Oct31 839:36 /usr/sbin/glusterfs --process-name fuse --volfile-server=10.201.0.1 --volfile-server=10.201.0.8:10.201.0.5:10.201.0.6:10.201.0.7:10.201.0.9 --volfile-id=/docker2 /mnt/docker2

The gluster version on this machine is 7.8, but i'm currently running a mixed cluster of 6.10 and 7.8, while awaiting to proceed to upgrade for the issue mentioned earlier with the self-heal daemon.

The affected volume info looks like;

# gluster v info docker2

Volume Name: docker2
Type: Distributed-Replicate
Volume ID: 4e0670a0-3d00-4360-98bd-3da844cedae5
Status: Started
Snapshot Count: 0
Number of Bricks: 3 x (2 + 1) = 9
Transport-type: tcp
Bricks:
Brick1: 10.201.0.5:/data0/gfs/bricks/brick1/docker2
Brick2: 10.201.0.9:/data0/gfs/bricks/brick1/docker2
Brick3: 10.201.0.3:/data0/gfs/bricks/bricka/docker2 (arbiter)
Brick4: 10.201.0.6:/data0/gfs/bricks/brick1/docker2
Brick5: 10.201.0.7:/data0/gfs/bricks/brick1/docker2
Brick6: 10.201.0.4:/data0/gfs/bricks/bricka/docker2 (arbiter)
Brick7: 10.201.0.1:/data0/gfs/bricks/brick1/docker2
Brick8: 10.201.0.8:/data0/gfs/bricks/brick1/docker2
Brick9: 10.201.0.2:/data0/gfs/bricks/bricka/docker2 (arbiter)
Options Reconfigured:
performance.cache-size: 128MB
transport.address-family: inet
nfs.disable: on
cluster.brick-multiplex: on

The issue seems to be triggered by a program called zammad, which has an init process, which runs in a loop. on cycle it re-compiles the ruby-on-rails application.

I've attached 2 statedumps, but as i only recently noticed the high memory usage, i believe both statedumps already show an escalated state of the glusterfs process. If it's needed to also have them from the beginning let me know. The dumps are taken about an hour apart.
Also i've included the glusterd.log. I couldn't include mnt-docker2.log since it's too large, since it's littered with: " I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht"
However i've inspected the log and it contains no Error message's all are of the Info kind;
which look like these;
[2020-11-19 03:29:05.406766] I [glusterfsd-mgmt.c:2282:mgmt_getspec_cbk] 0-glusterfs: No change in volfile,continuing
[2020-11-19 03:29:21.271886] I [socket.c:865:__socket_shutdown] 0-docker2-client-8: intentional socket shutdown(5)
[2020-11-19 03:29:24.479738] I [socket.c:865:__socket_shutdown] 0-docker2-client-2: intentional socket shutdown(5)
[2020-11-19 03:30:12.318146] I [socket.c:865:__socket_shutdown] 0-docker2-client-5: intentional socket shutdown(5)
[2020-11-19 03:31:27.381720] I [socket.c:865:__socket_shutdown] 0-docker2-client-8: intentional socket shutdown(5)
[2020-11-19 03:31:30.579630] I [socket.c:865:__socket_shutdown] 0-docker2-client-2: intentional socket shutdown(5)
[2020-11-19 03:32:18.427364] I [socket.c:865:__socket_shutdown] 0-docker2-client-5: intentional socket shutdown(5)

The rename messages look like these;
[2020-11-19 03:29:05.402663] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/95/75f93c20e375c5.tmp.eVcE5D (fe083b7e-b0d5-485c-8666-e1f7cdac33e2) (hash=docker2-replicate-2/cache=docker2-replicate-2) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/95/75f93c20e375c5 ((null)) (hash=docker2-replicate-2/cache=<nul>)
[2020-11-19 03:29:05.410972] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/0d/86dd25f3d238ff.tmp.AdDTLu (b1edadad-1d48-4bf4-be85-ffbe9d69d338) (hash=docker2-replicate-1/cache=docker2-replicate-1) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/0d/86dd25f3d238ff ((null)) (hash=docker2-replicate-2/cache=<nul>)
[2020-11-19 03:29:05.420064] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/f2/6e44f76b508fd3.tmp.QKmxul (31f80fcb-977c-433b-9259-5fdfcad1171c) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/f2/6e44f76b508fd3 ((null)) (hash=docker2-replicate-0/cache=<nul>)
[2020-11-19 03:29:05.427537] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/b0/1d7303d9dfe009.tmp.qLUMec (e2fdf971-731f-4765-80e8-3165433488ea) (hash=docker2-replicate-2/cache=docker2-replicate-2) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/b0/1d7303d9dfe009 ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.440576] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/bd/952a089e164b36.tmp.4qvl22 (3e0bc6d1-13ac-47c6-b221-1256b4b506ef) (hash=docker2-replicate-2/cache=docker2-replicate-2) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/bd/952a089e164b36 ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.452407] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/a3/b587dd08f35e2e.tmp.iIweTT (9685b5f3-4b14-4050-9b00-1163856239b5) (hash=docker2-replicate-1/cache=docker2-replicate-1) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/a3/b587dd08f35e2e ((null)) (hash=docker2-replicate-0/cache=<nul>)
[2020-11-19 03:29:05.460720] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/48/89cfb1b971c025.tmp.0W7jMK (d0a8d0a4-c783-45db-bb4a-68e24044d830) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/48/89cfb1b971c025 ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.468800] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/d9/759d55e8da66eb.tmp.2yXtHB (e5b61ef5-a3c2-4a2c-aa47-c377a6c090d7) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/d9/759d55e8da66eb ((null)) (hash=docker2-replicate-0/cache=<nul>)
[2020-11-19 03:29:05.476745] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/1c/f3a658342e36b7.tmp.gSkiEs (17181a40-f9b2-438f-9dfc-7bb159c516e6) (hash=docker2-replicate-2/cache=docker2-replicate-2) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/1c/f3a658342e36b7 ((null)) (hash=docker2-replicate-0/cache=<nul>)
[2020-11-19 03:29:05.486729] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/f1/6bef7cb6446c7a.tmp.sVT0Dj (cb6b1d52-b1c0-420c-86b7-2ceb8e8e73db) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/f1/6bef7cb6446c7a ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.495115] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/45/73ba226559961b.tmp.QdPTFa (d8450d9e-62a7-4fd5-9dd2-e072e318d9a0) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/45/73ba226559961b ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.503424] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/13/29c0df35961ca0.tmp.s1xUJ1 (ffc57a77-8b91-4264-8e2d-a9966f0f37ef) (hash=docker2-replicate-1/cache=docker2-replicate-1) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/13/29c0df35961ca0 ((null)) (hash=docker2-replicate-2/cache=<nul>)
[2020-11-19 03:29:05.513532] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/be/8d6a07b6a0d6ad.tmp.A5DzQS (5a595a65-372d-4377-b547-2c4e23f7be3a) (hash=docker2-replicate-1/cache=docker2-replicate-1) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/be/8d6a07b6a0d6ad ((null)) (hash=docker2-replicate-0/cache=<nul>)
[2020-11-19 03:29:05.526885] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/ec/4208216d993cbe.tmp.IMXg0J (2fa99fcd-64f8-4934-aeda-b356816f1132) (hash=docker2-replicate-2/cache=docker2-replicate-2) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/ec/4208216d993cbe ((null)) (hash=docker2-replicate-2/cache=<nul>)
[2020-11-19 03:29:05.537637] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/57/1527c482cf2d6b.tmp.Y2L0cB (db24d7bf-4a06-4356-a52e-1ab9537d1c3a) (hash=docker2-replicate-0/cache=docker2-replicate-0) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/57/1527c482cf2d6b ((null)) (hash=docker2-replicate-1/cache=<nul>)
[2020-11-19 03:29:05.547878] I [MSGID: 109066] [dht-rename.c:1951:dht_rename] 0-docker2-dht: renaming /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/88/1b60ead8d4c4e5.tmp.u47rss (b12f041b-5bbd-4e3d-b700-8f673830393f) (hash=docker2-replicate-1/cache=docker2-replicate-1) => /corporate/zammad/tmp/init/cache/bootsnap-compile-cache/88/1b60ead8d4c4e5 ((null)) (hash=docker2-replicate-1/cache=<nul>)

if i can provide any more information please let me know.

Thanks Olaf


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