Re: nfsd4 laundromat_main hung tasks

Chuck Lever <chuck.lever@xxxxxxxxxx> · Mon, 13 Jan 2025 08:39:18 -0500

On 1/13/25 7:30 AM, Rik Theys wrote:
I've created a systemd unit to run trace-cmd on boot. I've started it
(before rebooting the system) to see how much disk space would be in
use by having it running.
When I stopped it and ran "trace-cmd report", it showed a lot of
[FAILED TO PARSE] lines, such as:

             nfsd-6279  [035] 2560643.942059: nfsd_cb_queue:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245597
cb=0xffff94488e9c8d90 need_restart=0 addr=ARRAY[]
   kworker/u192:4-4169949 [032] 2560643.942079: nfsd_cb_start:
[FAILED TO PARSE] state=0x1 cl_boot=1734210227 cl_id=1829245597
addr=ARRAY[]
   kworker/u192:4-4169949 [032] 2560643.942081: nfsd_cb_bc_update:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245597
cb=0xffff94488e9c8d90 need_restart=0 addr=ARRAY[]
   kworker/u192:4-4169949 [032] 2560643.942082: nfsd_cb_destroy:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245597
cb=0xffff94488e9c8d90 need_restart=0 addr=ARRAY[]
             nfsd-6328  [028] 2560643.942503: nfsd_cb_probe:
[FAILED TO PARSE] state=0x1 cl_boot=1734210227 cl_id=1829245598
addr=ARRAY[02, 00, 00, 00, 0a, 57, 18, a4, 00, 00, 00, 00, 00, 00, 00,
00]
             nfsd-6328  [028] 2560643.942504: nfsd_cb_queue:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245598
cb=0xffff94488e9c8300 need_restart=0 addr=ARRAY[02, 00, 00, 00, 0a,
57, 18, a4, 00, 00, 00, 00, 00, 00, 00, 00]
   kworker/u192:4-4169949 [032] 2560643.942515: nfsd_cb_start:
[FAILED TO PARSE] state=0x1 cl_boot=1734210227 cl_id=1829245598
addr=ARRAY[02, 00, 00, 00, 0a, 57, 18, a4, 00, 00, 00, 00, 00, 00, 00,
00]
   kworker/u192:4-4169949 [032] 2560643.942515: nfsd_cb_bc_update:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245598
cb=0xffff94488e9c8300 need_restart=0 addr=ARRAY[02, 00, 00, 00, 0a,
57, 18, a4, 00, 00, 00, 00, 00, 00, 00, 00]
   kworker/u192:4-4169949 [032] 2560643.942769: nfsd_cb_setup:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245598 authflavor=0x1
addr=ARRAY[02, 00, 00, 00, 0a, 57, 18, a4, 00, 00, 00, 00, 00, 00, 00,
00] netid=tcp
   kworker/u192:4-4169949 [032] 2560643.942770: nfsd_cb_new_state:
[FAILED TO PARSE] state=0x0 cl_boot=1734210227 cl_id=1829245598
addr=ARRAY[02, 00, 00, 00, 0a, 57, 18, a4, 00, 00, 00, 00, 00, 00, 00,
00]
   kworker/u192:4-4169949 [032] 2560643.942770: nfsd_cb_destroy:
[FAILED TO PARSE] cl_boot=1734210227 cl_id=1829245598
cb=0xffff94488e9c8300 need_restart=0 addr=ARRAY[02, 00, 00, 00, 0a,
57, 18, a4, 00, 00, 00, 00, 00, 00, 00, 00]

Is there any additional option I need to specify, or can these items be ignored?

Nope. This means your distribution's user space tracing libraries
are old. The part of these records that failed to parse are the IP
addresses which aren't important for the current exercise.

--
Chuck Lever