[Bug 2062568] [NEW] nfsd gets unresponsive after some hours of operation

[Olle Liljenzin]

Public bug reported:

I installed the 22.04 Beta on two test machines that were running 22.04
without issues before. One of them exports two volumes that are mounted
by the other machine, which primarily uses them as a secondary storage
for ccache.

After being up for a couple of hours (happened twice since yesterday
evening) it seems that nfsd on the machine exporting the volumes hangs
on something.

>From dmesg on the server (repeated a few times):

[11183.290548] INFO: task nfsd:1419 blocked for more than 1228 seconds.
[11183.290558]       Not tainted 6.8.0-22-generic #22-Ubuntu
[11183.290563] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[11183.290582] task:nfsd            state:D stack:0     pid:1419  tgid:1419  ppid:2      flags:0x00004000
[11183.290587] Call Trace:
[11183.290602]  <TASK>
[11183.290606]  __schedule+0x27c/0x6b0
[11183.290612]  schedule+0x33/0x110
[11183.290615]  schedule_timeout+0x157/0x170
[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]
[11183.290744]  nfsd4_proc_compound+0x3af/0x770 [nfsd]
[11183.290798]  nfsd_dispatch+0xd4/0x220 [nfsd]
[11183.290851]  svc_process_common+0x44d/0x710 [sunrpc]
[11183.290924]  ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
[11183.290976]  svc_process+0x132/0x1b0 [sunrpc]
[11183.291041]  svc_handle_xprt+0x4d3/0x5d0 [sunrpc]
[11183.291105]  svc_recv+0x18b/0x2e0 [sunrpc]
[11183.291168]  ? __pfx_nfsd+0x10/0x10 [nfsd]
[11183.291220]  nfsd+0x8b/0xe0 [nfsd]
[11183.291270]  kthread+0xef/0x120
[11183.291274]  ? __pfx_kthread+0x10/0x10
[11183.291276]  ret_from_fork+0x44/0x70
[11183.291279]  ? __pfx_kthread+0x10/0x10
[11183.291281]  ret_from_fork_asm+0x1b/0x30
[11183.291286]  </TASK>

>From dmesg on the client (repeated a number of times):
[ 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

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: nfs-kernel-server 1:2.6.4-3ubuntu5
ProcVersionSignature: Ubuntu 6.8.0-22.22-generic 6.8.1
Uname: Linux 6.8.0-22-generic x86_64
.etc.request-key.d.id_resolver.conf: create	id_resolver	*	*	/usr/sbin/nfsidmap -t 600 %k %d
ApportVersion: 2.28.1-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: pass
Date: Fri Apr 19 14:10:25 2024
InstallationDate: Installed on 2024-04-16 (3 days ago)
InstallationMedia: Ubuntu-Server 24.04 LTS "Noble Numbat" - Beta amd64 (20240410.1)
NFSMounts:
 
NFSv4Mounts:
 
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: nfs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2062568

Title:
  nfsd gets unresponsive after some hours of operation

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  I installed the 22.04 Beta on two test machines that were running
  22.04 without issues before. One of them exports two volumes that are
  mounted by the other machine, which primarily uses them as a secondary
  storage for ccache.

  After being up for a couple of hours (happened twice since yesterday
  evening) it seems that nfsd on the machine exporting the volumes hangs
  on something.

  From dmesg on the server (repeated a few times):

  [11183.290548] INFO: task nfsd:1419 blocked for more than 1228 seconds.
  [11183.290558]       Not tainted 6.8.0-22-generic #22-Ubuntu
  [11183.290563] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [11183.290582] task:nfsd            state:D stack:0     pid:1419  tgid:1419  ppid:2      flags:0x00004000
  [11183.290587] Call Trace:
  [11183.290602]  <TASK>
  [11183.290606]  __schedule+0x27c/0x6b0
  [11183.290612]  schedule+0x33/0x110
  [11183.290615]  schedule_timeout+0x157/0x170
  [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]
  [11183.290744]  nfsd4_proc_compound+0x3af/0x770 [nfsd]
  [11183.290798]  nfsd_dispatch+0xd4/0x220 [nfsd]
  [11183.290851]  svc_process_common+0x44d/0x710 [sunrpc]
  [11183.290924]  ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
  [11183.290976]  svc_process+0x132/0x1b0 [sunrpc]
  [11183.291041]  svc_handle_xprt+0x4d3/0x5d0 [sunrpc]
  [11183.291105]  svc_recv+0x18b/0x2e0 [sunrpc]
  [11183.291168]  ? __pfx_nfsd+0x10/0x10 [nfsd]
  [11183.291220]  nfsd+0x8b/0xe0 [nfsd]
  [11183.291270]  kthread+0xef/0x120
  [11183.291274]  ? __pfx_kthread+0x10/0x10
  [11183.291276]  ret_from_fork+0x44/0x70
  [11183.291279]  ? __pfx_kthread+0x10/0x10
  [11183.291281]  ret_from_fork_asm+0x1b/0x30
  [11183.291286]  </TASK>

  From dmesg on the client (repeated a number of times):
  [ 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

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: nfs-kernel-server 1:2.6.4-3ubuntu5
  ProcVersionSignature: Ubuntu 6.8.0-22.22-generic 6.8.1
  Uname: Linux 6.8.0-22-generic x86_64
  .etc.request-key.d.id_resolver.conf: create	id_resolver	*	*	/usr/sbin/nfsidmap -t 600 %k %d
  ApportVersion: 2.28.1-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Fri Apr 19 14:10:25 2024
  InstallationDate: Installed on 2024-04-16 (3 days ago)
  InstallationMedia: Ubuntu-Server 24.04 LTS "Noble Numbat" - Beta amd64 (20240410.1)
  NFSMounts:
   
  NFSv4Mounts:
   
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: nfs-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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