On Sat, Jun 13, 2020 at 02:54:31PM +0200, Salvatore Bonaccorso wrote: > indicated this was specifically observed on ZFS on Linux only. Seth > Arnold's answer seem to be inline with that that the issue is more on > the ZFS on Linux side and the issue keeps biting people a bit > unexpectedly. Why does this break with ACL off settings?
I disagree with this assessment. All of the reporters have been using ZFS, but this could indicate an absence of testers using other filesystems. We need someone with a NFS server which has a 4.15+ kernel and uses a different filesystem which supports ACLs. I'm though doubtful ACLs are related to the actual problem. My impression of what I've read is they're a useful tool to work around the problem, but not related to the actual cause. > But there was at least one other (but again without further > detail/followups) that it was observed on an export from OpenWRT, but > no specific details here: > > https://bugs.openwrt.org/index.php?do=details&task_id=2581 This appears to be the same reporter as the RedHat bug report (comment 3 on the RedHat report). This is a report for the server portion of the reporter's setup. Analyzing the setup, I disagree with one of the prior assessment of this report. This is OpenWRT on x86_64 hardware which would suggest a high-end router or embedded device. Such might well have ECC memory and a processor fast enough to handle ZFS. Let me add one more data point. I had been thinking I might need the additional features in Linux-ZFS 0.7.12. As such my NFS server had been running a 4.9 kernel with Debian's ZFS 0.7.12-2+debg10u1~bpo9+1 packages. Now with the problem manifesting my NFS server is running a 4.19 kernel with Debian's ZFS 0.7.12-2+deb10u2 packages. I could well believe the actual root cause is a problem with the Linux-ZFS implementation. What manifested the problem though seems to be in Linux's NFS implementation between 4.9 and 4.15. ie Linux-ZFS implemented /something/ which worked when implemented, but may not have properly implemented the intended API and was broken by Linux-NFS. -- (\___(\___(\______ --=> 8-) EHM <=-- ______/)___/)___/) \BS ( | ehem+sig...@m5p.com PGP 87145445 | ) / \_CS\ | _____ -O #include <stddisclaimer.h> O- _____ | / _/ 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445
