On 17/06/2024 3:31 pm, Chuck Lever III wrote:
On Jun 17, 2024, at 2:55 AM, Harald Dunkel <harald.dunkel@xxxxxxxxxx> wrote: Hi folks, what would be the reason for nfsd getting stuck somehow and becoming an unkillable process? See - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1071562 - https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/2062568 Doesn't this mean that something inside the kernel gets stuck as well? Seems odd to me.I'm not familiar with the Debian or Ubuntu kernel packages. Can the kernel release numbers be translated to LTS kernel releases
The Debian NFS server's broken kernel corresponds to upstream stable 6.1.90. There doesn't seem to be any note of a working version.
Decoding the Ubuntu pkg version is harder (but is obviously the 6.8.y series; the actual corresponding 'y' value is printed during boot, but other than downloading the pkg source, I'm not sure how to find it otherwise). The older Ubuntu mentioned in the bug as seeing the nfsd issue will be 6.5.y.
Harald: do you have a Debian/Ubuntu kernel version that doesn't see the issue, please? i.e. ideally from the same 6.1.y series…
cheers, c.
please? Need both "last known working" and "first broken" releases. This: [ 6596.911785] RPC: Could not send backchannel reply error: -110 [ 6596.972490] RPC: Could not send backchannel reply error: -110 [ 6837.281307] RPC: Could not send backchannel reply error: -110 is a known set of client backchannel bugs. Knowing the LTS kernel releases (see above) will help us figure out what needs to be backported to the LTS kernels kernels in question. This: [11183.290619] wait_for_completion+0x88/0x150 [11183.290623] __flush_workqueue+0x140/0x3e0 [11183.290629] nfsd4_probe_callback_sync+0x1a/0x30 [nfsd] [11183.290689] nfsd4_destroy_session+0x186/0x260 [nfsd] is probably related to the backchannel errors on the client, but client bugs shouldn't cause the server to hang like this. We might be able to say more if you can provide the kernel release translations (see above). -- Chuck Lever
-- Calum Mackay Linux Kernel Engineering Oracle Linux and Virtualisation
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