[Bug 281574] bc(1) runs in endless loop

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281574

            Bug ID: 281574
           Summary: bc(1) runs in endless loop
           Product: Base System
           Version: 14.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: wosch@FreeBSD.org

I killed a terminal with a running bc command. The terminal is gone, but bc(1)
runs in an endless loop now:

top(1) output:
40325 wosch         1 135    0    13M  3332K CPU0     0   1:14  99.86% bc


ktrace -p 40325
kdump

 40325 bc       CALL  read(0,0x217008d92da8,0x1)
 40325 bc       GIO   fd 0 read 0 bytes
       ""
 40325 bc       RET   read 0
 40325 bc       CALL  ioctl(0,TIOCSETAW,0x3821a3c5b238)
 40325 bc       RET   ioctl -1 errno 25 Inappropriate ioctl for device
 40325 bc       CALL  sigprocmask(SIG_BLOCK,0x217008d92e58,0x217008d92e68)
 40325 bc       RET   sigprocmask 0
 40325 bc       CALL  ioctl(0,TIOCGWINSZ,0x217008d92e10)
 40325 bc       RET   ioctl -1 errno 25 Inappropriate ioctl for device
 40325 bc       CALL  sigprocmask(SIG_SETMASK,0x217008d92e68,0)
 40325 bc       RET   sigprocmask 0
 40325 bc       CALL  read(0,0x217008d92da8,0x1)
 40325 bc       GIO   fd 0 read 0 bytes
       ""
 40325 bc       RET   read 0
 40325 bc       CALL  ioctl(0,TIOCSETAW,0x3821a3c5b238)
 40325 bc       RET   ioctl -1 errno 25 Inappropriate ioctl for device
 40325 bc       CALL  sigprocmask(SIG_BLOCK,0x217008d92e58,0x217008d92e68)
 40325 bc       RET   sigprocmask 0
 40325 bc       CALL  ioctl(0,TIOCGWINSZ,0x217008d92e10)
 40325 bc       RET   ioctl -1 errno 25 Inappropriate ioctl for device
 40325 bc       CALL  sigprocmask(SIG_SETMASK,0x217008d92e68,0)
 40325 bc       RET   sigprocmask 0
 40325 bc       CALL  read(0,0x217008d92da8,0x1)
 40325 bc       GIO   fd 0 read 0 bytes


I tried to kill the process, but it worked only with SIGKILL and not
SIGTERM/SIGHUP
kill -9 40325

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