OCI: Warning “systemd-udevd: worker /devices/virtual/block/dm-x is taking a long time

Applies To:

Oracle Cloud Infrastructure

Oracle Linux x86_64

Symptoms:

Seeing following intermittent warning in /var/log/messages. There is no system performance issue noticed.

WARN  2024-07-03T16:01:16.371867+02:00 <server>systemd-udevd:warning: worker [267789] /devices/virtual/block/dm-18 is taking a long time

WARN  2024-07-03T16:01:16.380395+02:00 <server>systemd-udevd:warning: worker [267801] /devices/virtual/block/dm-20 is taking a long time

Issue occurs when system load is high.

12:00:01 AM     CPU      %usr     %nice      %sys   %iowait    %steal      %irq     %soft    %guest    %gnice     %idle
12:10:01 AM     all     72.58      0.26     17.49      0.02      0.00      2.46      3.18      0.00      0.00      4.02
12:10:01 AM       0     69.66      0.19     18.39      0.02      0.00      3.35      5.28      0.00      0.00      3.12
12:10:01 AM       1     67.36      0.13     19.13      0.01      0.00      2.79      6.57      0.00      0.00      4.01
12:10:01 AM       2     76.40      0.38     16.58      0.02      0.01      1.86      0.45      0.00      0.00      4.30
12:10:01 AM       3     76.90      0.34     15.86      0.01      0.00      1.82      0.42      0.00      0.00      4.64
12:20:01 AM     all     74.31      0.27     16.22      0.01      0.00      2.38      2.80      0.00      0.00      4.01

Solution:

Warnings can be safely ignored as there is no system performance issue.
This happens when the system load goes high and the processing was taking a long time.