Date: Thu, 30 Aug 2012 07:43:46 +0100 From: Matt Burke <mattblists@icritical.com> To: <freebsd-stable@freebsd.org> Subject: Killing processes from DDB Message-ID: <503F0BA2.6060107@icritical.com>
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Is it possible to forcibly kill process from DDB which are unkillable from
userland? My understanding is the 'kill' command is effectively the same as
the userland version, so perhaps a process could be terminated by invoking
an OOM handler or something?
I just had a VirtualBox instance crash and hog 100% CPU on my desktop:
mattb 36939 100.0 13.6 2577328 2276108 ?? I 6:13AM 2:28.44
/usr/local/lib/virtualbox/VirtualBox
I kill -9 it
mattb 36939 100.0 13.6 2577328 2275804 ?? T 6:13AM 3:10.89
/usr/local/lib/virtualbox/VirtualBox
Note it's moved to 'stop' state for some reason, yet is still eating 100%
cpu time
# procstat -k 36939
PID TID COMM TDNAME KSTACK
36939 227509 VirtualBox - <running>
36939 227836 VirtualBox - mi_switch
thread_suspend_switch thread_single exit1 sigexit postsig ast doreti_ast
Could this be the trigger - 9.0 binary (from pkgng) against 9.1?
$ procstat -b 1 36939
PID COMM OSREL PATH
1 init 901000 /sbin/init
36939 VirtualBox 900044 /usr/local/lib/virtualbox/VirtualBox
I couldn't even kill it with "dtrace -n 'pid$target:::' -p 36939 -l" -
which so far has proven reliable in killing anything:
# dtrace -n 'pid$target:::' -p 2021 -l <--- unimportant proc
Bus error: 10 (core dumped)
# dtrace -n 'pid$target:::' -p 2044 -l <--- unimportant proc
Bus error: 10 (core dumped)
# dtrace -n 'pid$target:::' -p 36939 -l <--- virtualbox hangs dtrace
^C
I couldn't truss the process or use gcore to get a dump, so my only option
was a reboot. Does anyone have any suggestions on a course of action in
case this happens again? I can't get a kernel dump since the machine
doesn't have enough swap (small SSDs)
Thanks
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