FreeBSD-CURRENT unable to stop virtual_oss

root@mowa219-gjp4-8570p:~ # sudo pkill virtual_oss
root@mowa219-gjp4-8570p:~ # ps aux | grep virtual_oss
root          3706   0.0  0.0    29692    8200  -  DEs  12:55      0:14.69 virtual_oss -B -C 2 -c 2 -r 48000 -b 24 -s 8.0ms -f /dev/dsp3 -d dsp
root          5654   0.0  0.0    12968    2296  2  S+   13:45      0:00.00 grep virtual_oss
root@mowa219-gjp4-8570p:~ # service virtual_oss stop
/usr/local/etc/rc.d/virtual_oss: DEBUG: run_rc_command: doit: virtual_oss_stop
root@mowa219-gjp4-8570p:~ # service virtual_oss status
/usr/local/etc/rc.d/virtual_oss: DEBUG: checkyesno: virtual_oss_enable is set to YES.
/usr/local/etc/rc.d/virtual_oss: DEBUG: run_rc_command: doit: virtual_oss_status
virtual_oss is running as pid 3706.
root@mowa219-gjp4-8570p:~ # date ; uname -v
Sun Dec 20 14:01:02 GMT 2020
FreeBSD 13.0-CURRENT #74 r368589: Sun Dec 13 07:55:46 GMT 2020     root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
root@mowa219-gjp4-8570p:~ #

…

root@mowa219-gjp4-8570p:~ # sysrc virtual_oss_enable="NO"
virtual_oss_enable: YES -> NO
root@mowa219-gjp4-8570p:~ # service virtual_oss onestop
/usr/local/etc/rc.d/virtual_oss: DEBUG: run_rc_command: doit: virtual_oss_stop
root@mowa219-gjp4-8570p:~ # ps aux | grep virtual_oss
root          3706   0.0  0.0    29692    8200  -  DEs  12:55      0:14.70 virtual_oss -B -C 2 -c 2 -r 48000 -b 24 -s 8.0ms -f /dev/dsp3 -d dsp
root          6520   0.0  0.0    12968    2296  2  S+   14:05      0:00.00 grep virtual_oss
root@mowa219-gjp4-8570p:~ # sudo pkill virtual_oss
root@mowa219-gjp4-8570p:~ # ps aux | grep virtual_oss
root          3706   0.0  0.0    29692    8200  -  DEs  12:55      0:14.70 virtual_oss -B -C 2 -c 2 -r 48000 -b 24 -s 8.0ms -f /dev/dsp3 -d dsp
root          6536   0.0  0.0    12968    2296  2  S+   14:05      0:00.00 grep virtual_oss
root@mowa219-gjp4-8570p:~ # service virtual_oss onestatus
/usr/local/etc/rc.d/virtual_oss: DEBUG: checkyesno: virtual_oss_enable is set to YES.
/usr/local/etc/rc.d/virtual_oss: DEBUG: run_rc_command: doit: virtual_oss_status
virtual_oss is running as pid 3706.
root@mowa219-gjp4-8570p:~ #