[Bug 287872] 14.3-STABLE boot time regression related to netlink and devd

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287872

--- Comment #3 from Eugene Grosbein <eugen@freebsd.org> ---
Note also: while removing vlans with the command "ifconfig -g scan | time xargs
-n1 -I^ ifconfig ^ destroy" sometimes this process takes moderate time (less
then 8 second in total), but sometimes it takes about 160 second and Ctrl-T
shows in process:

load: 5.30  cmd: ifconfig 72666 [EDRAIN] 0.14r 0.00u 0.00s 0% 3132k
       66,25 real         0,00 user         0,00 sys
load: 5.30  cmd: ifconfig 72666 [EDRAIN] 0.33r 0.00u 0.00s 0% 3132k
       66,45 real         0,00 user         0,00 sys
load: 4.38  cmd: ifconfig 75760 [vlan_sx] 0.07r 0.00u 0.00s 0% 3160k
      100,75 real         0,00 user         0,00 sys
load: 4.38  cmd: ifconfig 75760 [vlan_sx] 0.41r 0.00u 0.00s 0% 3160k
      101,09 real         0,00 user         0,00 sys
load: 4.38  cmd: ifconfig 75765 [vlan_sx] 0.29r 0.00u 0.01s 0% 3136k
      101,47 real         0,00 user         0,00 sys

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