Shell process hang in -CURRENT

From: <soralx_at_cydem.org>
Date: Sat, 26 Jun 2021 12:16:28 UTC
 FWIW:

 # alias
 s       sync; sync; sync;

 <terminal sitting idle>
 root@soralx:/usr/src# s
 load: 0.58  cmd: csh 29319 [suspended] 444444.50r 0.02u 0.00s 0% 5120k
 mi_switch+0xbe thread_suspend_switch+0xca cursig+0x634 ast+0x30f fast_syscall_common+0x1a5
 load: 0.29  cmd: csh 29319 [suspended] 444482.97r 0.02u 0.00s 0% 5120k
 mi_switch+0xbe thread_suspend_switch+0xca cursig+0x634 ast+0x30f fast_syscall_common+0x1a5
 ^C
 load: 0.36  cmd: csh 29319 [suspended] 444505.34r 0.02u 0.00s 0% 5120k
 mi_switch+0xbe thread_suspend_switch+0xca cursig+0x634 ast+0x30f fast_syscall_common+0x1a5

 Had to `kill -CONT 29319` a few times to end the process and
 restore shell. `s` worked fine in other terminal windows during
 this time.

 # uname -a
 FreeBSD soralx.cydem.org 14.0-CURRENT FreeBSD 14.0-CURRENT #0 main-n247386-870e197d52c-dirty: Tue Jun 15 18:24:00 PDT 2021     root@soralx.cydem.org:/usr/obj/usr/src/amd64.amd64/sys/SORALX  amd64

 Please ignore if this is a fixed/known behaviour.

-- 
[SorAlx]  ridin' VN2000 Classic LT