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I posted a question in https://bbs.archlinux.org/viewtopic.php?id=307373 it is probably an issue with systemd but effects my afs login.

@gay do you have openafs-modules-dkms or openafs-modules installed, updated too? I guess one of these is required to install and to have their post installation hooks running to build the modules after installation. This is usually done automatically. I use aura (aura-bin https://aur.archlinux.org/packages/aura-bin) for AUR packages.

Somehow, I can no longer start openafs-client:

$ sudo systemctl start openafs-client
Job for openafs-client.service failed because the control process exited with error code.
...
$sudo systemctl status openafs-client
...
modprobe: FATAL: Module openafs not found in directory /lib/modules/6.9.2-arch1-1
$

/usr/lib/systemd/system/openafs-client.service is owned by openafs, but openafs does not own anything in /lib/modules/6.9.2-arch1-1. I can also not find an openafs kernel module, presumably named something like openafs.ko anywhere. I am unsure if that existed in previous versions.

Since nobody else reports this error, I am sure I am missing something here somehow. It's very strange though.

Thank you @Bevan. Unfortunately I can still produce hangs.

    $ cmdebug localhost
    Lock afs_discon_lock status: (none_waiting, 1 read_locks(pid:0))
    ** Cache entry @ 0x9e48dd80 for ....
        locks: (none_waiting, write_locked(pid:2431 at:147))
                2048 bytes  DV           72  refcnt     2
        callback 4686a300   expires 1716290143
        0 opens 0 writers
        normal file
        states (0x1), stat'd

I triggered the problem when zooming into a libreoffice document and scrolling with the mouse. When libreoffice hangs I can also not change into the configuration directory, which is under AFS.

~/.config/libreoffice/4/user

@drslmr: I have updated the openafs-modules(-dkms) packages today and noticed that one of the patches I had previously applied for Linux 6.8 has been dropped upstream and another one was reverted. So there may be a chance that one of these caused some issues.

@Bevan: anyway today and yesterday it seams like we have some network problems. So it may not be worth wasting your weekend right now.

Thank you @Bevan.

My results are:

ping -s $((1500 - 28)) -M do 8.8.8.8 -c 1
PING 8.8.8.8 (8.8.8.8) 1472(1500) bytes of data.
76 bytes from 8.8.8.8: icmp_seq=1 ttl=116 (truncated)

--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 15.731/15.731/15.731/0.000 ms

ping -s $((1500)) -M do 8.8.8.8 -c 1
PING 8.8.8.8 (8.8.8.8) 1500(1528) bytes of data.
ping: local error: message too long, mtu=1500

@drslmr: I will do some testing on the weekend but currently I don't think that this is related to our packaging of OpenAFS.

This is really just a shot in the dark, but when I had similar issues, it was (partially) caused by my internet connection which provides a lower MTU than normal for IPv4 connections. You may try adding "-rxmaxmtu 1404" (or even lower numbers) to AFSD_ARGS in /etc/conf.d/openafs. You'll need to restart the OpenAFS client afterwards. You can also use ping to determine your MTU (see for example https://mike632t.wordpress.com/2019/03/03/determine-mtu-size-using-ping/). If it's anything below 1492, this may be the reason.

Similar as described at https://bbs.archlinux.org/viewtopic.php?id=295218 I get hangs also in firefox. My .mozilla is in AFS. I found that I can "cd" to .mozilla/firefox but "cd" hangs when changing into the default profile sub-directory.

$ cmdebug localhost
Lock afs_discon_lock status: (none_waiting, 3 read_locks(pid:0))
** Cache entry @ 0x15bfdd80 for 182.537041393.18360.17115257 [<my domain>]
    locks: (none_waiting, upgrade_locked(pid:2455 at:121))
         2426640 bytes  DV        14448  refcnt     2
    callback c3dfa100   expires 1714731281
    4 opens     4 writers
    normal file
    states (0x21), stat'd
** Cache entry @ 0x21dcfb40 for 182.537041393.284080.16762084 [<my domain>]
    locks: (none_waiting, write_locked(pid:670 at:51))
               0 bytes  DV            0  refcnt     3
    callback c3dfa100   expires 1714731280
    1 opens     1 writers
    normal file
    states (0x21), stat'd
** Cache entry @ 0x21dca640 for 182.537041393.50053.16761613 [<my domain>]
    locks: (none_waiting, write_locked(pid:3003 at:147))
            6144 bytes  DV       166272  refcnt     2
    callback c3dfa100   expires 1714731280
    0 opens     0 writers
    normal file
    states (0x1), stat'd
** Cache entry @ 0x095fc840 for 182.537041393.50669.17578544 [<my domain>]
    locks: (none_waiting, write_locked(pid:2507 at:142))
            2048 bytes  DV           39  refcnt     2
    callback c3dfa100   expires 1714732222
    0 opens     0 writers
    normal file
    states (0x1), stat'd

Some system info:

openafs 1.8.11-1
openafs-modules-dkms 1.8.11-1
linux 6.8.7.arch1-1