[Samba] Samba 4.7.6-ubuntu taking 100% CPU
Olaf Marzocchi
lists at marzocchi.net
Thu Apr 1 23:41:41 UTC 2021
I forgot the ZFS dataset properties:
NAME PROPERTY VALUE
tank/home/olaf type filesystem
tank/home/olaf creation Sun Mar 10 13:54 2019
tank/home/olaf used 2.00T
tank/home/olaf available 1010G
tank/home/olaf referenced 435G
tank/home/olaf compressratio 1.01x
tank/home/olaf mounted yes
tank/home/olaf quota none
tank/home/olaf reservation none
tank/home/olaf recordsize 128K
tank/home/olaf mountpoint /tank/home/olaf
tank/home/olaf sharenfs off
tank/home/olaf checksum on
tank/home/olaf compression lz4
tank/home/olaf atime off
tank/home/olaf devices on
tank/home/olaf exec on
tank/home/olaf setuid on
tank/home/olaf readonly off
tank/home/olaf zoned off
tank/home/olaf snapdir hidden
tank/home/olaf aclmode discard
tank/home/olaf aclinherit restricted
tank/home/olaf createtxg 27
tank/home/olaf canmount on
tank/home/olaf xattr sa
tank/home/olaf copies 1
tank/home/olaf version 5
tank/home/olaf utf8only on
tank/home/olaf normalization formD
tank/home/olaf casesensitivity mixed
tank/home/olaf vscan off
tank/home/olaf nbmand off
tank/home/olaf sharesmb off
tank/home/olaf refquota none
tank/home/olaf refreservation none
tank/home/olaf guid 16212392165534091407
tank/home/olaf primarycache all
tank/home/olaf secondarycache all
tank/home/olaf usedbysnapshots 7.11G
tank/home/olaf usedbydataset 435G
tank/home/olaf usedbychildren 1.57T
tank/home/olaf usedbyrefreservation 0B
tank/home/olaf logbias latency
tank/home/olaf objsetid 70
tank/home/olaf dedup off
tank/home/olaf mlslabel none
tank/home/olaf sync standard
tank/home/olaf dnodesize auto
tank/home/olaf refcompressratio 1.03x
tank/home/olaf written 0
tank/home/olaf logicalused 2.04T
tank/home/olaf logicalreferenced 451G
tank/home/olaf volmode default
tank/home/olaf filesystem_limit none
tank/home/olaf snapshot_limit none
tank/home/olaf filesystem_count none
tank/home/olaf snapshot_count none
tank/home/olaf snapdev hidden
tank/home/olaf acltype posix
tank/home/olaf context none
tank/home/olaf fscontext none
tank/home/olaf defcontext none
tank/home/olaf rootcontext none
tank/home/olaf relatime off
tank/home/olaf redundant_metadata all
tank/home/olaf overlay on
tank/home/olaf encryption off
tank/home/olaf keylocation none
tank/home/olaf keyformat none
tank/home/olaf pbkdf2iters 0
tank/home/olaf special_small_blocks 0
Regards,
Olaf Marzocchi
Il 02/04/2021 01:31, Olaf Marzocchi ha scritto:
>
> Dear all,
> I recently incurred in an issue with Samba 4.7.6-ubuntu (Ubuntu 18.04.05
> LTS, with latest updates).
> I'm not sure what caused the issue, since at the same time I performed
> updates to Ubuntu (apt upgrade) and I separately updated the zfs kernel
> module to 2.0.4 from the latest version available mid last year and some
> time passed before I noticed the issue.
>
> The issue manifests itself as following: when I try to open some files
> (not all of them) from any SMB share (I tried two different Windows 10
> machines and one macOS 10.14), the smb3 process takes 100% CPU, it
> doesn't seem to retrieve the file, and I have to kill it "-9", the hard
> way. I found that, sometimes, after I kill smbd3 Windows gets the file I
> tried to open, but it's not a way that always works: sometimes it's
> corrupted (cut too short).
> I tested locally from ssh and the same files have no issues whatsoever,
> it's not a hardware issue. I can read and copy them without problems.
>
> I run influxdb on the same server to track disk and system load and I
> can see that at the same time smb goes crazy the ZFS cache stats jump
> from about 90 read ops/s to about 250K read ops/s (requested, less than
> 1 op/s actually goes to disk thanks to caching). I attach synchronised
> CPU and ZFS cache graphs.
>
> I set logging in smb.conf to level 3 and I deleted all the logs, then I
> restarted smbd and nmbd. I opened a file I know causes the locking and
> after I verified the issue, I killed smbd3 and compressesd the logs.
>
> I attach a tgz with all the logs and a text file with the smbd.conf,
> cleaned up from comments.
>
> I also paste the output of "ls -l" and "getfacl" on a file which I know
> causes the issue. I don't post the same information for any other file,
> for the simple reason that the attributes are the same... there is no
> apparent difference between safe and troubling files.
>
> root at ml110g7:/var/log/samba# ls -l /tank/home/olaf/Documents/Documenti\
> ufficiali/Documenti\ di\ identità/CI\ 2017.pdf
> -rwxrw---- 1 olaf olaf 1570923 Feb 15 21:49
> '/tank/home/olaf/Documents/Documenti ufficiali/Documenti di identità/CI
> 2017.pdf'
>
> root at ml110g7:/var/log/samba# getfacl
> /tank/home/olaf/Documents/Documenti\ ufficiali/Documenti\ di\
> identità/CI\ 2017.pdf
> getfacl: Removing leading '/' from absolute path names
> # file: tank/home/olaf/Documents/Documenti ufficiali/Documenti di
> identità/CI 2017.pdf
> # owner: olaf
> # group: olaf
> user::rwx
> group::rw-
> other::---
>
> Can someone please help me debug the issue? I couldn't find any previous
> occurrence in Internet, so I'm not sure where to start with.
>
> I hope I provided all the needed information, but I can post more if I
> missed some.
>
> Thanks in advance
> Olaf Marzocchi
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