login: panic: semop - can't undo undos
cpuid = 3
Trace beginning at frame 0xfffff8011833b888
sys_semop() at sys_semop+0x65d 0xffffffff806b2b9d 
sys_semop() at sys_semop+0x65d 0xffffffff806b2b9d 
syscall2() at syscall2+0x11e 0xffffffff80bd6a0e 
Debugger("panic")

CPU3 stopping CPUs: 0x00000037
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)