Public bug reported:

Two times (on October 11 and October 21st) we hadnext issue: server with
nfs-kernel-server.service: nfs service hangs forever at some point. The
load is not heavy (but I have never been able to check nfsstat or
nfsiostat on that server). The logs are the same bunch of messages (for
nfsd and kworker tasks respectively):

Oct 11 13:18:50 dataserv2 kernel: [689338.249129] INFO: task nfsd:5516 blocked 
for more than 120 seconds.
Oct 11 13:18:50 dataserv2 kernel: [689338.249611]       Not tainted 
6.2.0-33-generic #33~22.04.1-Ubuntu
Oct 11 13:18:50 dataserv2 kernel: [689338.250041] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 11 13:18:50 dataserv2 kernel: [689338.250469] task:nfsd            state:D 
stack:0     pid:5516  ppid:2      flags:0x00004000
Oct 11 13:18:50 dataserv2 kernel: [689338.250477] Call Trace:
Oct 11 13:18:50 dataserv2 kernel: [689338.250480]  <TASK>
Oct 11 13:18:50 dataserv2 kernel: [689338.250486]  __schedule+0x2b7/0x5f0
Oct 11 13:18:50 dataserv2 kernel: [689338.250500]  schedule+0x68/0x110
Oct 11 13:18:50 dataserv2 kernel: [689338.250508]  
raid5_get_active_stripe+0x1f5/0x280 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.250526]  ? 
__pfx_autoremove_wake_function+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.250536]  
make_stripe_request+0x9c/0x390 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.250550]  
raid5_make_request+0x1ac/0x480 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.250562]  ? 
__pfx_woken_wake_function+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.250567]  md_handle_request+0x140/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.250575]  ? 
__bio_split_to_limits+0x110/0x2b0
Oct 11 13:18:50 dataserv2 kernel: [689338.250581]  md_submit_bio+0x66/0xb0
Oct 11 13:18:50 dataserv2 kernel: [689338.250586]  __submit_bio+0xa4/0x1a0
Oct 11 13:18:50 dataserv2 kernel: [689338.250590]  
__submit_bio_noacct+0x81/0x1f0
Oct 11 13:18:50 dataserv2 kernel: [689338.250593]  
submit_bio_noacct_nocheck+0x102/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.250597]  submit_bio_noacct+0x1d0/0x700
Oct 11 13:18:50 dataserv2 kernel: [689338.250600]  submit_bio+0x28/0x90
Oct 11 13:18:50 dataserv2 kernel: [689338.250602]  iomap_submit_ioend+0x53/0x90
Oct 11 13:18:50 dataserv2 kernel: [689338.250609]  
iomap_writepage_map+0x217/0x430
Oct 11 13:18:50 dataserv2 kernel: [689338.250613]  
iomap_do_writepage+0x161/0x240
Oct 11 13:18:50 dataserv2 kernel: [689338.250617]  write_cache_pages+0x19c/0x540
Oct 11 13:18:50 dataserv2 kernel: [689338.250624]  ? 
__pfx_iomap_do_writepage+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.250629]  iomap_writepages+0x21/0x50
Oct 11 13:18:50 dataserv2 kernel: [689338.250635]  xfs_vm_writepages+0x82/0xc0 
[xfs]
Oct 11 13:18:50 dataserv2 kernel: [689338.250790]  do_writepages+0xd3/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.250794]  ? iomap_iter+0x95/0x150
Oct 11 13:18:50 dataserv2 kernel: [689338.250798]  ? iomap_zero_range+0x7a/0x280
Oct 11 13:18:50 dataserv2 kernel: [689338.250803]  
filemap_fdatawrite_wbc+0x7c/0xb0
Oct 11 13:18:50 dataserv2 kernel: [689338.250808]  
__filemap_fdatawrite_range+0x54/0x80
Oct 11 13:18:50 dataserv2 kernel: [689338.250813]  
filemap_write_and_wait_range+0x5c/0xd0
Oct 11 13:18:50 dataserv2 kernel: [689338.250817]  xfs_setattr_size+0x29b/0x3e0 
[xfs]
Oct 11 13:18:50 dataserv2 kernel: [689338.250951]  
xfs_vn_setattr_size+0x4a/0xb0 [xfs]
Oct 11 13:18:50 dataserv2 kernel: [689338.251053]  xfs_vn_setattr+0x79/0x130 
[xfs]
Oct 11 13:18:50 dataserv2 kernel: [689338.251155]  notify_change+0x43b/0x5c0
Oct 11 13:18:50 dataserv2 kernel: [689338.251162]  nfsd_setattr+0x20f/0x4b0 
[nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251213]  ? nfsd_setattr+0x20f/0x4b0 
[nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251253]  
nfsd3_proc_setattr+0xa1/0x100 [nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251300]  nfsd_dispatch+0x176/0x2b0 
[nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251346]  
svc_process_common+0x36e/0x690 [sunrpc]
Oct 11 13:18:50 dataserv2 kernel: [689338.251409]  ? 
__pfx_nfsd_dispatch+0x10/0x10 [nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251449]  ? __pfx_nfsd+0x10/0x10 [nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251489]  svc_process+0xb2/0x110 
[sunrpc]
Oct 11 13:18:50 dataserv2 kernel: [689338.251537]  nfsd+0xda/0x1c0 [nfsd]
Oct 11 13:18:50 dataserv2 kernel: [689338.251577]  kthread+0xee/0x120
Oct 11 13:18:50 dataserv2 kernel: [689338.251584]  ? __pfx_kthread+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.251588]  ret_from_fork+0x2c/0x50
Oct 11 13:18:50 dataserv2 kernel: [689338.251594]  </TASK>
Oct 11 13:18:50 dataserv2 kernel: [689338.251640] INFO: task 
kworker/u194:3:470724 blocked for more than 120 seconds.
Oct 11 13:18:50 dataserv2 kernel: [689338.252079]       Not tainted 
6.2.0-33-generic #33~22.04.1-Ubuntu
Oct 11 13:18:50 dataserv2 kernel: [689338.252511] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 11 13:18:50 dataserv2 kernel: [689338.252966] task:kworker/u194:3  state:D 
stack:0     pid:470724 ppid:2      flags:0x00004000
Oct 11 13:18:50 dataserv2 kernel: [689338.252973] Workqueue: writeback 
wb_workfn (flush-253:7)
Oct 11 13:18:50 dataserv2 kernel: [689338.252982] Call Trace:
Oct 11 13:18:50 dataserv2 kernel: [689338.252984]  <TASK>
Oct 11 13:18:50 dataserv2 kernel: [689338.252986]  __schedule+0x2b7/0x5f0
Oct 11 13:18:50 dataserv2 kernel: [689338.252992]  ? __blk_flush_plug+0xc4/0x130
Oct 11 13:18:50 dataserv2 kernel: [689338.252997]  schedule+0x68/0x110
Oct 11 13:18:50 dataserv2 kernel: [689338.253003]  
raid5_get_active_stripe+0x1f5/0x280 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.253016]  ? 
__pfx_autoremove_wake_function+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.253023]  
make_stripe_request+0x9c/0x390 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.253036]  
raid5_make_request+0x1ac/0x480 [raid456]
Oct 11 13:18:50 dataserv2 kernel: [689338.253049]  ? 
__pfx_woken_wake_function+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.253054]  md_handle_request+0x140/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.253058]  ? 
__bio_split_to_limits+0x98/0x2b0
Oct 11 13:18:50 dataserv2 kernel: [689338.253063]  md_submit_bio+0x66/0xb0
Oct 11 13:18:50 dataserv2 kernel: [689338.253069]  __submit_bio+0xa4/0x1a0
Oct 11 13:18:50 dataserv2 kernel: [689338.253073]  
__submit_bio_noacct+0x81/0x1f0
Oct 11 13:18:50 dataserv2 kernel: [689338.253077]  
submit_bio_noacct_nocheck+0x102/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.253083]  ? 
folio_memcg_unlock+0x38/0x80
Oct 11 13:18:50 dataserv2 kernel: [689338.253091]  submit_bio_noacct+0x1d0/0x700
Oct 11 13:18:50 dataserv2 kernel: [689338.253097]  submit_bio+0x28/0x90
Oct 11 13:18:50 dataserv2 kernel: [689338.253101]  iomap_submit_ioend+0x53/0x90
Oct 11 13:18:50 dataserv2 kernel: [689338.253105]  
iomap_writepage_map+0x217/0x430
Oct 11 13:18:50 dataserv2 kernel: [689338.253110]  
iomap_do_writepage+0x161/0x240
Oct 11 13:18:50 dataserv2 kernel: [689338.253115]  write_cache_pages+0x19c/0x540
Oct 11 13:18:50 dataserv2 kernel: [689338.253119]  ? 
__pfx_iomap_do_writepage+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.253126]  iomap_writepages+0x21/0x50
Oct 11 13:18:50 dataserv2 kernel: [689338.253129]  xfs_vm_writepages+0x82/0xc0 
[xfs]
Oct 11 13:18:50 dataserv2 kernel: [689338.253257]  do_writepages+0xd3/0x1e0
Oct 11 13:18:50 dataserv2 kernel: [689338.253264]  
__writeback_single_inode+0x44/0x280
Oct 11 13:18:50 dataserv2 kernel: [689338.253270]  
writeback_sb_inodes+0x22f/0x500
Oct 11 13:18:50 dataserv2 kernel: [689338.253278]  
__writeback_inodes_wb+0x56/0xf0
Oct 11 13:18:50 dataserv2 kernel: [689338.253282]  wb_writeback+0x1db/0x2d0
Oct 11 13:18:50 dataserv2 kernel: [689338.253288]  wb_do_writeback+0x293/0x2a0
Oct 11 13:18:50 dataserv2 kernel: [689338.253293]  wb_workfn+0x61/0x240
Oct 11 13:18:50 dataserv2 kernel: [689338.253299]  ? 
_raw_spin_lock_irqsave+0xe/0x20
Oct 11 13:18:50 dataserv2 kernel: [689338.253307]  ? try_to_wake_up+0x6c/0x630
Oct 11 13:18:50 dataserv2 kernel: [689338.253315]  process_one_work+0x21f/0x440
Oct 11 13:18:50 dataserv2 kernel: [689338.253321]  worker_thread+0x50/0x3f0
Oct 11 13:18:50 dataserv2 kernel: [689338.253326]  ? 
__pfx_worker_thread+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.253330]  kthread+0xee/0x120
Oct 11 13:18:50 dataserv2 kernel: [689338.253334]  ? __pfx_kthread+0x10/0x10
Oct 11 13:18:50 dataserv2 kernel: [689338.253339]  ret_from_fork+0x2c/0x50
Oct 11 13:18:50 dataserv2 kernel: [689338.253343]  </TASK>


Oct 21 06:28:47 dataserv2 kernel: INFO: task nfsd:5416 blocked for more than 
120 seconds.
Oct 21 06:28:47 dataserv2 kernel:       Not tainted 6.2.0-34-generic 
#34~22.04.1-Ubuntu
Oct 21 06:28:47 dataserv2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 21 06:28:47 dataserv2 kernel: task:nfsd            state:D stack:0     
pid:5416  ppid:2      flags:0x00004000
Oct 21 06:28:47 dataserv2 kernel: Call Trace:
Oct 21 06:28:47 dataserv2 kernel:  <TASK>
Oct 21 06:28:47 dataserv2 kernel:  __schedule+0x2b7/0x5f0
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  schedule+0x68/0x110
Oct 21 06:28:47 dataserv2 kernel:  raid5_get_active_stripe+0x1f5/0x280 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_autoremove_wake_function+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  make_stripe_request+0x9c/0x390 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  raid5_make_request+0x1ac/0x480 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_woken_wake_function+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  md_handle_request+0x140/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? __bio_split_to_limits+0x98/0x2b0
Oct 21 06:28:47 dataserv2 kernel:  md_submit_bio+0x66/0xb0
Oct 21 06:28:47 dataserv2 kernel:  __submit_bio+0xa4/0x1a0
Oct 21 06:28:47 dataserv2 kernel:  __submit_bio_noacct+0x81/0x1f0
Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct_nocheck+0x102/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct+0x1d0/0x700
Oct 21 06:28:47 dataserv2 kernel:  submit_bio+0x28/0x90
Oct 21 06:28:47 dataserv2 kernel:  ? bio_clone_blkg_association+0x20/0x40
Oct 21 06:28:47 dataserv2 kernel:  iomap_add_to_ioend+0x2a7/0x2d0
Oct 21 06:28:47 dataserv2 kernel:  iomap_writepage_map+0x113/0x430
Oct 21 06:28:47 dataserv2 kernel:  iomap_do_writepage+0x161/0x240
Oct 21 06:28:47 dataserv2 kernel:  write_cache_pages+0x19c/0x540
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_iomap_do_writepage+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  ? __br_fdb_add+0xbf/0x170 [bridge]
Oct 21 06:28:47 dataserv2 kernel:  iomap_writepages+0x21/0x50
Oct 21 06:28:47 dataserv2 kernel:  xfs_vm_writepages+0x82/0xc0 [xfs]
Oct 21 06:28:47 dataserv2 kernel:  do_writepages+0xd3/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? iomap_iter+0x95/0x150
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? iomap_zero_range+0x7a/0x280
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  filemap_fdatawrite_wbc+0x7c/0xb0
Oct 21 06:28:47 dataserv2 kernel:  __filemap_fdatawrite_range+0x54/0x80
Oct 21 06:28:47 dataserv2 kernel:  filemap_write_and_wait_range+0x5c/0xd0
Oct 21 06:28:47 dataserv2 kernel:  xfs_setattr_size+0x29b/0x3e0 [xfs]
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  xfs_vn_setattr_size+0x4a/0xb0 [xfs]
Oct 21 06:28:47 dataserv2 kernel:  xfs_vn_setattr+0x79/0x130 [xfs]
Oct 21 06:28:47 dataserv2 kernel:  notify_change+0x43b/0x5c0
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? nfsd_setuser+0x12e/0x2c0 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  __nfsd_setattr+0x66/0xd0 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  ? __nfsd_setattr+0x66/0xd0 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  nfsd_setattr+0x21d/0x480 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  nfsd3_proc_setattr+0xa1/0x100 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  nfsd_dispatch+0x176/0x2b0 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  svc_process_common+0x36e/0x690 [sunrpc]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_nfsd+0x10/0x10 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  svc_process+0xb2/0x110 [sunrpc]
Oct 21 06:28:47 dataserv2 kernel:  nfsd+0xda/0x1c0 [nfsd]
Oct 21 06:28:47 dataserv2 kernel:  kthread+0xee/0x120
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_kthread+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  ret_from_fork+0x2c/0x50
Oct 21 06:28:47 dataserv2 kernel:  </TASK>
Oct 21 06:28:47 dataserv2 kernel: INFO: task kworker/u193:4:530942 blocked for 
more than 120 seconds.
Oct 21 06:28:47 dataserv2 kernel:       Not tainted 6.2.0-34-generic 
#34~22.04.1-Ubuntu
Oct 21 06:28:47 dataserv2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 21 06:28:47 dataserv2 kernel: task:kworker/u193:4  state:D stack:0     
pid:530942 ppid:2      flags:0x00004000
Oct 21 06:28:47 dataserv2 kernel: Workqueue: writeback wb_workfn (flush-253:7)
Oct 21 06:28:47 dataserv2 kernel: Call Trace:
Oct 21 06:28:47 dataserv2 kernel:  <TASK>
Oct 21 06:28:47 dataserv2 kernel:  __schedule+0x2b7/0x5f0
Oct 21 06:28:47 dataserv2 kernel:  ? __blk_flush_plug+0xc4/0x130
Oct 21 06:28:47 dataserv2 kernel:  schedule+0x68/0x110
Oct 21 06:28:47 dataserv2 kernel:  raid5_get_active_stripe+0x1f5/0x280 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_autoremove_wake_function+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  make_stripe_request+0x9c/0x390 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  raid5_make_request+0x1ac/0x480 [raid456]
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_woken_wake_function+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  md_handle_request+0x140/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? __bio_split_to_limits+0x98/0x2b0
Oct 21 06:28:47 dataserv2 kernel:  md_submit_bio+0x66/0xb0
Oct 21 06:28:47 dataserv2 kernel:  __submit_bio+0xa4/0x1a0
Oct 21 06:28:47 dataserv2 kernel:  __submit_bio_noacct+0x81/0x1f0
Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct_nocheck+0x102/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  ? folio_memcg_unlock+0x38/0x80
Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct+0x1d0/0x700
Oct 21 06:28:47 dataserv2 kernel:  submit_bio+0x28/0x90
Oct 21 06:28:47 dataserv2 kernel:  iomap_submit_ioend+0x53/0x90
Oct 21 06:28:47 dataserv2 kernel:  iomap_writepage_map+0x217/0x430
Oct 21 06:28:47 dataserv2 kernel:  iomap_do_writepage+0x161/0x240
Oct 21 06:28:47 dataserv2 kernel:  write_cache_pages+0x19c/0x540
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_iomap_do_writepage+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  iomap_writepages+0x21/0x50
Oct 21 06:28:47 dataserv2 kernel:  xfs_vm_writepages+0x82/0xc0 [xfs]
Oct 21 06:28:47 dataserv2 kernel:  do_writepages+0xd3/0x1e0
Oct 21 06:28:47 dataserv2 kernel:  __writeback_single_inode+0x44/0x280
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  writeback_sb_inodes+0x22f/0x500
Oct 21 06:28:47 dataserv2 kernel:  __writeback_inodes_wb+0x56/0xf0
Oct 21 06:28:47 dataserv2 kernel:  wb_writeback+0x1db/0x2d0
Oct 21 06:28:47 dataserv2 kernel:  wb_do_writeback+0x1d0/0x2a0
Oct 21 06:28:47 dataserv2 kernel:  wb_workfn+0x61/0x240
Oct 21 06:28:47 dataserv2 kernel:  ? raw_spin_rq_unlock+0x10/0x40
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? finish_task_switch.isra.0+0x84/0x290
Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
Oct 21 06:28:47 dataserv2 kernel:  ? __schedule+0x2bf/0x5f0
Oct 21 06:28:47 dataserv2 kernel:  ? fsnotify_mark_destroy_workfn+0xc6/0x110
Oct 21 06:28:47 dataserv2 kernel:  process_one_work+0x21f/0x440
Oct 21 06:28:47 dataserv2 kernel:  worker_thread+0x50/0x3f0
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_worker_thread+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  kthread+0xee/0x120
Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_kthread+0x10/0x10
Oct 21 06:28:47 dataserv2 kernel:  ret_from_fork+0x2c/0x50
Oct 21 06:28:47 dataserv2 kernel:  </TASK>


nfsd service is not active, when I check it after receiving these messages. All 
the clients are losing nfs mounts. 
kernel version was 6.2.0-34-generic, I upgraded it to 6.2.0-35-generic, so 
version_signature is changed. Didn't have the same problem yet but can't be 
sure if it is stable now.

Next command (I wanted to use for bug report data collection) gives me an 
error, therefore I cannot submit an output:
lspci -vnvn > lspci-vnvn.log
pcilib: sysfs_read_vpd: read failed: No such device

What logs should I submit?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2041777

Title:
  nfsd hangs forever

Status in linux package in Ubuntu:
  New

Bug description:
  Two times (on October 11 and October 21st) we hadnext issue: server
  with nfs-kernel-server.service: nfs service hangs forever at some
  point. The load is not heavy (but I have never been able to check
  nfsstat or nfsiostat on that server). The logs are the same bunch of
  messages (for nfsd and kworker tasks respectively):

  Oct 11 13:18:50 dataserv2 kernel: [689338.249129] INFO: task nfsd:5516 
blocked for more than 120 seconds.
  Oct 11 13:18:50 dataserv2 kernel: [689338.249611]       Not tainted 
6.2.0-33-generic #33~22.04.1-Ubuntu
  Oct 11 13:18:50 dataserv2 kernel: [689338.250041] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 11 13:18:50 dataserv2 kernel: [689338.250469] task:nfsd            
state:D stack:0     pid:5516  ppid:2      flags:0x00004000
  Oct 11 13:18:50 dataserv2 kernel: [689338.250477] Call Trace:
  Oct 11 13:18:50 dataserv2 kernel: [689338.250480]  <TASK>
  Oct 11 13:18:50 dataserv2 kernel: [689338.250486]  __schedule+0x2b7/0x5f0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250500]  schedule+0x68/0x110
  Oct 11 13:18:50 dataserv2 kernel: [689338.250508]  
raid5_get_active_stripe+0x1f5/0x280 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.250526]  ? 
__pfx_autoremove_wake_function+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.250536]  
make_stripe_request+0x9c/0x390 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.250550]  
raid5_make_request+0x1ac/0x480 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.250562]  ? 
__pfx_woken_wake_function+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.250567]  
md_handle_request+0x140/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250575]  ? 
__bio_split_to_limits+0x110/0x2b0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250581]  md_submit_bio+0x66/0xb0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250586]  __submit_bio+0xa4/0x1a0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250590]  
__submit_bio_noacct+0x81/0x1f0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250593]  
submit_bio_noacct_nocheck+0x102/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250597]  
submit_bio_noacct+0x1d0/0x700
  Oct 11 13:18:50 dataserv2 kernel: [689338.250600]  submit_bio+0x28/0x90
  Oct 11 13:18:50 dataserv2 kernel: [689338.250602]  
iomap_submit_ioend+0x53/0x90
  Oct 11 13:18:50 dataserv2 kernel: [689338.250609]  
iomap_writepage_map+0x217/0x430
  Oct 11 13:18:50 dataserv2 kernel: [689338.250613]  
iomap_do_writepage+0x161/0x240
  Oct 11 13:18:50 dataserv2 kernel: [689338.250617]  
write_cache_pages+0x19c/0x540
  Oct 11 13:18:50 dataserv2 kernel: [689338.250624]  ? 
__pfx_iomap_do_writepage+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.250629]  iomap_writepages+0x21/0x50
  Oct 11 13:18:50 dataserv2 kernel: [689338.250635]  
xfs_vm_writepages+0x82/0xc0 [xfs]
  Oct 11 13:18:50 dataserv2 kernel: [689338.250790]  do_writepages+0xd3/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250794]  ? iomap_iter+0x95/0x150
  Oct 11 13:18:50 dataserv2 kernel: [689338.250798]  ? 
iomap_zero_range+0x7a/0x280
  Oct 11 13:18:50 dataserv2 kernel: [689338.250803]  
filemap_fdatawrite_wbc+0x7c/0xb0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250808]  
__filemap_fdatawrite_range+0x54/0x80
  Oct 11 13:18:50 dataserv2 kernel: [689338.250813]  
filemap_write_and_wait_range+0x5c/0xd0
  Oct 11 13:18:50 dataserv2 kernel: [689338.250817]  
xfs_setattr_size+0x29b/0x3e0 [xfs]
  Oct 11 13:18:50 dataserv2 kernel: [689338.250951]  
xfs_vn_setattr_size+0x4a/0xb0 [xfs]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251053]  xfs_vn_setattr+0x79/0x130 
[xfs]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251155]  notify_change+0x43b/0x5c0
  Oct 11 13:18:50 dataserv2 kernel: [689338.251162]  nfsd_setattr+0x20f/0x4b0 
[nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251213]  ? nfsd_setattr+0x20f/0x4b0 
[nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251253]  
nfsd3_proc_setattr+0xa1/0x100 [nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251300]  nfsd_dispatch+0x176/0x2b0 
[nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251346]  
svc_process_common+0x36e/0x690 [sunrpc]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251409]  ? 
__pfx_nfsd_dispatch+0x10/0x10 [nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251449]  ? __pfx_nfsd+0x10/0x10 
[nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251489]  svc_process+0xb2/0x110 
[sunrpc]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251537]  nfsd+0xda/0x1c0 [nfsd]
  Oct 11 13:18:50 dataserv2 kernel: [689338.251577]  kthread+0xee/0x120
  Oct 11 13:18:50 dataserv2 kernel: [689338.251584]  ? __pfx_kthread+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.251588]  ret_from_fork+0x2c/0x50
  Oct 11 13:18:50 dataserv2 kernel: [689338.251594]  </TASK>
  Oct 11 13:18:50 dataserv2 kernel: [689338.251640] INFO: task 
kworker/u194:3:470724 blocked for more than 120 seconds.
  Oct 11 13:18:50 dataserv2 kernel: [689338.252079]       Not tainted 
6.2.0-33-generic #33~22.04.1-Ubuntu
  Oct 11 13:18:50 dataserv2 kernel: [689338.252511] "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 11 13:18:50 dataserv2 kernel: [689338.252966] task:kworker/u194:3  
state:D stack:0     pid:470724 ppid:2      flags:0x00004000
  Oct 11 13:18:50 dataserv2 kernel: [689338.252973] Workqueue: writeback 
wb_workfn (flush-253:7)
  Oct 11 13:18:50 dataserv2 kernel: [689338.252982] Call Trace:
  Oct 11 13:18:50 dataserv2 kernel: [689338.252984]  <TASK>
  Oct 11 13:18:50 dataserv2 kernel: [689338.252986]  __schedule+0x2b7/0x5f0
  Oct 11 13:18:50 dataserv2 kernel: [689338.252992]  ? 
__blk_flush_plug+0xc4/0x130
  Oct 11 13:18:50 dataserv2 kernel: [689338.252997]  schedule+0x68/0x110
  Oct 11 13:18:50 dataserv2 kernel: [689338.253003]  
raid5_get_active_stripe+0x1f5/0x280 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.253016]  ? 
__pfx_autoremove_wake_function+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.253023]  
make_stripe_request+0x9c/0x390 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.253036]  
raid5_make_request+0x1ac/0x480 [raid456]
  Oct 11 13:18:50 dataserv2 kernel: [689338.253049]  ? 
__pfx_woken_wake_function+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.253054]  
md_handle_request+0x140/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253058]  ? 
__bio_split_to_limits+0x98/0x2b0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253063]  md_submit_bio+0x66/0xb0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253069]  __submit_bio+0xa4/0x1a0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253073]  
__submit_bio_noacct+0x81/0x1f0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253077]  
submit_bio_noacct_nocheck+0x102/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253083]  ? 
folio_memcg_unlock+0x38/0x80
  Oct 11 13:18:50 dataserv2 kernel: [689338.253091]  
submit_bio_noacct+0x1d0/0x700
  Oct 11 13:18:50 dataserv2 kernel: [689338.253097]  submit_bio+0x28/0x90
  Oct 11 13:18:50 dataserv2 kernel: [689338.253101]  
iomap_submit_ioend+0x53/0x90
  Oct 11 13:18:50 dataserv2 kernel: [689338.253105]  
iomap_writepage_map+0x217/0x430
  Oct 11 13:18:50 dataserv2 kernel: [689338.253110]  
iomap_do_writepage+0x161/0x240
  Oct 11 13:18:50 dataserv2 kernel: [689338.253115]  
write_cache_pages+0x19c/0x540
  Oct 11 13:18:50 dataserv2 kernel: [689338.253119]  ? 
__pfx_iomap_do_writepage+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.253126]  iomap_writepages+0x21/0x50
  Oct 11 13:18:50 dataserv2 kernel: [689338.253129]  
xfs_vm_writepages+0x82/0xc0 [xfs]
  Oct 11 13:18:50 dataserv2 kernel: [689338.253257]  do_writepages+0xd3/0x1e0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253264]  
__writeback_single_inode+0x44/0x280
  Oct 11 13:18:50 dataserv2 kernel: [689338.253270]  
writeback_sb_inodes+0x22f/0x500
  Oct 11 13:18:50 dataserv2 kernel: [689338.253278]  
__writeback_inodes_wb+0x56/0xf0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253282]  wb_writeback+0x1db/0x2d0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253288]  wb_do_writeback+0x293/0x2a0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253293]  wb_workfn+0x61/0x240
  Oct 11 13:18:50 dataserv2 kernel: [689338.253299]  ? 
_raw_spin_lock_irqsave+0xe/0x20
  Oct 11 13:18:50 dataserv2 kernel: [689338.253307]  ? try_to_wake_up+0x6c/0x630
  Oct 11 13:18:50 dataserv2 kernel: [689338.253315]  
process_one_work+0x21f/0x440
  Oct 11 13:18:50 dataserv2 kernel: [689338.253321]  worker_thread+0x50/0x3f0
  Oct 11 13:18:50 dataserv2 kernel: [689338.253326]  ? 
__pfx_worker_thread+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.253330]  kthread+0xee/0x120
  Oct 11 13:18:50 dataserv2 kernel: [689338.253334]  ? __pfx_kthread+0x10/0x10
  Oct 11 13:18:50 dataserv2 kernel: [689338.253339]  ret_from_fork+0x2c/0x50
  Oct 11 13:18:50 dataserv2 kernel: [689338.253343]  </TASK>


  Oct 21 06:28:47 dataserv2 kernel: INFO: task nfsd:5416 blocked for more than 
120 seconds.
  Oct 21 06:28:47 dataserv2 kernel:       Not tainted 6.2.0-34-generic 
#34~22.04.1-Ubuntu
  Oct 21 06:28:47 dataserv2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 21 06:28:47 dataserv2 kernel: task:nfsd            state:D stack:0     
pid:5416  ppid:2      flags:0x00004000
  Oct 21 06:28:47 dataserv2 kernel: Call Trace:
  Oct 21 06:28:47 dataserv2 kernel:  <TASK>
  Oct 21 06:28:47 dataserv2 kernel:  __schedule+0x2b7/0x5f0
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  schedule+0x68/0x110
  Oct 21 06:28:47 dataserv2 kernel:  raid5_get_active_stripe+0x1f5/0x280 
[raid456]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_autoremove_wake_function+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  make_stripe_request+0x9c/0x390 [raid456]
  Oct 21 06:28:47 dataserv2 kernel:  raid5_make_request+0x1ac/0x480 [raid456]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_woken_wake_function+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  md_handle_request+0x140/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? __bio_split_to_limits+0x98/0x2b0
  Oct 21 06:28:47 dataserv2 kernel:  md_submit_bio+0x66/0xb0
  Oct 21 06:28:47 dataserv2 kernel:  __submit_bio+0xa4/0x1a0
  Oct 21 06:28:47 dataserv2 kernel:  __submit_bio_noacct+0x81/0x1f0
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct_nocheck+0x102/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct+0x1d0/0x700
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio+0x28/0x90
  Oct 21 06:28:47 dataserv2 kernel:  ? bio_clone_blkg_association+0x20/0x40
  Oct 21 06:28:47 dataserv2 kernel:  iomap_add_to_ioend+0x2a7/0x2d0
  Oct 21 06:28:47 dataserv2 kernel:  iomap_writepage_map+0x113/0x430
  Oct 21 06:28:47 dataserv2 kernel:  iomap_do_writepage+0x161/0x240
  Oct 21 06:28:47 dataserv2 kernel:  write_cache_pages+0x19c/0x540
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_iomap_do_writepage+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  ? __br_fdb_add+0xbf/0x170 [bridge]
  Oct 21 06:28:47 dataserv2 kernel:  iomap_writepages+0x21/0x50
  Oct 21 06:28:47 dataserv2 kernel:  xfs_vm_writepages+0x82/0xc0 [xfs]
  Oct 21 06:28:47 dataserv2 kernel:  do_writepages+0xd3/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? iomap_iter+0x95/0x150
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? iomap_zero_range+0x7a/0x280
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  filemap_fdatawrite_wbc+0x7c/0xb0
  Oct 21 06:28:47 dataserv2 kernel:  __filemap_fdatawrite_range+0x54/0x80
  Oct 21 06:28:47 dataserv2 kernel:  filemap_write_and_wait_range+0x5c/0xd0
  Oct 21 06:28:47 dataserv2 kernel:  xfs_setattr_size+0x29b/0x3e0 [xfs]
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  xfs_vn_setattr_size+0x4a/0xb0 [xfs]
  Oct 21 06:28:47 dataserv2 kernel:  xfs_vn_setattr+0x79/0x130 [xfs]
  Oct 21 06:28:47 dataserv2 kernel:  notify_change+0x43b/0x5c0
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? nfsd_setuser+0x12e/0x2c0 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  __nfsd_setattr+0x66/0xd0 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  ? __nfsd_setattr+0x66/0xd0 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  nfsd_setattr+0x21d/0x480 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  nfsd3_proc_setattr+0xa1/0x100 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  nfsd_dispatch+0x176/0x2b0 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  svc_process_common+0x36e/0x690 [sunrpc]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_nfsd+0x10/0x10 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  svc_process+0xb2/0x110 [sunrpc]
  Oct 21 06:28:47 dataserv2 kernel:  nfsd+0xda/0x1c0 [nfsd]
  Oct 21 06:28:47 dataserv2 kernel:  kthread+0xee/0x120
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_kthread+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  ret_from_fork+0x2c/0x50
  Oct 21 06:28:47 dataserv2 kernel:  </TASK>
  Oct 21 06:28:47 dataserv2 kernel: INFO: task kworker/u193:4:530942 blocked 
for more than 120 seconds.
  Oct 21 06:28:47 dataserv2 kernel:       Not tainted 6.2.0-34-generic 
#34~22.04.1-Ubuntu
  Oct 21 06:28:47 dataserv2 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Oct 21 06:28:47 dataserv2 kernel: task:kworker/u193:4  state:D stack:0     
pid:530942 ppid:2      flags:0x00004000
  Oct 21 06:28:47 dataserv2 kernel: Workqueue: writeback wb_workfn (flush-253:7)
  Oct 21 06:28:47 dataserv2 kernel: Call Trace:
  Oct 21 06:28:47 dataserv2 kernel:  <TASK>
  Oct 21 06:28:47 dataserv2 kernel:  __schedule+0x2b7/0x5f0
  Oct 21 06:28:47 dataserv2 kernel:  ? __blk_flush_plug+0xc4/0x130
  Oct 21 06:28:47 dataserv2 kernel:  schedule+0x68/0x110
  Oct 21 06:28:47 dataserv2 kernel:  raid5_get_active_stripe+0x1f5/0x280 
[raid456]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_autoremove_wake_function+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  make_stripe_request+0x9c/0x390 [raid456]
  Oct 21 06:28:47 dataserv2 kernel:  raid5_make_request+0x1ac/0x480 [raid456]
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_woken_wake_function+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  md_handle_request+0x140/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? __bio_split_to_limits+0x98/0x2b0
  Oct 21 06:28:47 dataserv2 kernel:  md_submit_bio+0x66/0xb0
  Oct 21 06:28:47 dataserv2 kernel:  __submit_bio+0xa4/0x1a0
  Oct 21 06:28:47 dataserv2 kernel:  __submit_bio_noacct+0x81/0x1f0
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct_nocheck+0x102/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  ? folio_memcg_unlock+0x38/0x80
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio_noacct+0x1d0/0x700
  Oct 21 06:28:47 dataserv2 kernel:  submit_bio+0x28/0x90
  Oct 21 06:28:47 dataserv2 kernel:  iomap_submit_ioend+0x53/0x90
  Oct 21 06:28:47 dataserv2 kernel:  iomap_writepage_map+0x217/0x430
  Oct 21 06:28:47 dataserv2 kernel:  iomap_do_writepage+0x161/0x240
  Oct 21 06:28:47 dataserv2 kernel:  write_cache_pages+0x19c/0x540
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_iomap_do_writepage+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  iomap_writepages+0x21/0x50
  Oct 21 06:28:47 dataserv2 kernel:  xfs_vm_writepages+0x82/0xc0 [xfs]
  Oct 21 06:28:47 dataserv2 kernel:  do_writepages+0xd3/0x1e0
  Oct 21 06:28:47 dataserv2 kernel:  __writeback_single_inode+0x44/0x280
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  writeback_sb_inodes+0x22f/0x500
  Oct 21 06:28:47 dataserv2 kernel:  __writeback_inodes_wb+0x56/0xf0
  Oct 21 06:28:47 dataserv2 kernel:  wb_writeback+0x1db/0x2d0
  Oct 21 06:28:47 dataserv2 kernel:  wb_do_writeback+0x1d0/0x2a0
  Oct 21 06:28:47 dataserv2 kernel:  wb_workfn+0x61/0x240
  Oct 21 06:28:47 dataserv2 kernel:  ? raw_spin_rq_unlock+0x10/0x40
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? finish_task_switch.isra.0+0x84/0x290
  Oct 21 06:28:47 dataserv2 kernel:  ? srso_alias_return_thunk+0x5/0x7f
  Oct 21 06:28:47 dataserv2 kernel:  ? __schedule+0x2bf/0x5f0
  Oct 21 06:28:47 dataserv2 kernel:  ? fsnotify_mark_destroy_workfn+0xc6/0x110
  Oct 21 06:28:47 dataserv2 kernel:  process_one_work+0x21f/0x440
  Oct 21 06:28:47 dataserv2 kernel:  worker_thread+0x50/0x3f0
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_worker_thread+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  kthread+0xee/0x120
  Oct 21 06:28:47 dataserv2 kernel:  ? __pfx_kthread+0x10/0x10
  Oct 21 06:28:47 dataserv2 kernel:  ret_from_fork+0x2c/0x50
  Oct 21 06:28:47 dataserv2 kernel:  </TASK>

  
  nfsd service is not active, when I check it after receiving these messages. 
All the clients are losing nfs mounts. 
  kernel version was 6.2.0-34-generic, I upgraded it to 6.2.0-35-generic, so 
version_signature is changed. Didn't have the same problem yet but can't be 
sure if it is stable now.

  Next command (I wanted to use for bug report data collection) gives me an 
error, therefore I cannot submit an output:
  lspci -vnvn > lspci-vnvn.log
  pcilib: sysfs_read_vpd: read failed: No such device

  What logs should I submit?

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