Thanks, I'll look into this.
I just ran a quick test (non-Ubuntu and with a Linux 6.18 kernel) and wasn't able to duplicate the problem. I'll need to set up an Ubuntu 24.04 system to see if I can duplicate this. -- Cheyenne Wills [email protected] On Mon, 9 Mar 2026 14:29:29 +0100 Gaja Sophie Peters <[email protected]> wrote: > TLDR: OpenAFS on Ubuntu with kernel 6.17 is in certain circumstances > not updating the Cache on file-deletion or file-creation happening on > a different machine, the only fix is: echo 3 >/proc/sys/vm/drop_caches > > > Long version: We discovered a problem with the recent advent of the > kernel 6.17 as the newest "hardware enablement kernel" in Ubuntu > 24.04. Basically the existence or non-existence of a file is not > correctly reflected by the AFS-Cache, when a file is deleted or > created on another machine after the file was seen (or not) on the > current machine. > > ### first test: file deletion not propagated > #this command on a different machine# echo X >test-afs > $ cat test-afs > X > #this command on the other machine# rm test-afs > $ cat test-afs > X > $ fs flushall > $ cat test-afs > cat: test-afs: Input/output error > #as root# echo 3 >/proc/sys/vm/drop_caches > $ cat test-afs > cat: test-afs: No such file or directory > ### second test: file creation not propagated > #this command on a different machine# echo Y >test-afs > $ cat test-afs > cat: test-afs: No such file or directory > $ fs flushall > $ cat test-afs > cat: test-afs: No such file or directory > #as root# echo 3 >/proc/sys/vm/drop_caches > $ cat test-afs > Y > > We haven't yet tried to pinpoint at which exact kernel-version that > problem got introduced, but the Ubuntu-kernels 6.8 and 6.14 are > unaffected, the Ubuntu-kernel 6.17 is affected (kAFS on 6.17 is > unaffected). It doesn't make a difference, if the OpenAFS-version is > 1.8.14 with the Ubuntu-patches for Kernel 6.17 or if it is OpenAFS > 1.8.15 > > The file server hosting the volume was originally 1.8.13.2-1 from > Debian Trixie, but updating to 1.8.15 does not change anything, > either. > > Is this known? Any idea how to deal with it? > > Greetings, > Gaja Peters > > _______________________________________________ > OpenAFS-info mailing list > [email protected] > https://lists.openafs.org/mailman/listinfo/openafs-info _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
