46:login: panic: assertion "sigiop == sigio->sio_myref" failed in funsetown at /usr/src/sys/kern/kern_descrip.c:1247
47:cpuid = 5
49:funsetown() at funsetown+0x159 0xffffffff8062ff49 
50:funsetown() at funsetown+0x159 0xffffffff8062ff49 
51:fsetown() at fsetown+0xdb 0xffffffff8063009b 
52:pipe_ioctl() at pipe_ioctl+0x11f 0xffffffff806a940f 
55:Debugger("panic")
59:Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
60:db>