[Bug 218431] Process hangs in uninterruptable sleep 'cgticb'

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218431

            Bug ID: 218431
           Summary: Process hangs in uninterruptable sleep 'cgticb'
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yuri at rawbw.com

scanimage from sane-backends-1.0.25 can't be killed (-9):

>   PID  PPID  PGID   SID  TSID THR LOGIN    WCHAN     EMUL          COMM        
> 34808 34807 34807 25735 25735   1 yuri     cgticb    FreeBSD ELF64 scanimage   

I think it's almost always a bug in kernel when some system call never exits
like this.

The original command was:
> scanimage --resolution 600

cam_periph_getccb in cam/cam_xpt.c

r308114

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