Unable to kill processes using either Ctrl-C or 'kill'

[Christos Chatzaras]

We had the same (or similar problem) problem with FreeBSD 10.3 and creating big archives with tar sometimes was making the tar process to hang and kill -9 was not able to stop the process. This bug was fixed in FreeBSD 10-STABLE.


> On 11 Jun 2018, at 12:03, Michael Schuster <michaelsprivate at gmail.com> wrote:
> 
> I can think of two ways a process/thread gets "stuck" in the kernel
> 1) it's waiting for some kind of lock/resource to get released
> 2) like 1, but doing so "busy waiting"
> 
> for 1), all I can think of is a kernel debugger and some fairly
> sophisticated twiddling of bits ...
> 
> in the second case, the system's load is probably quite high, and you may
> be able to find out what it's doing using dtrace and a profile provider ...
> 
> HTH
> Michael
> 
> On Mon, Jun 11, 2018 at 10:50 AM Ole <ole at free.de> wrote:
> 
>> Sun, 3 Jun 2018 21:03:31 +0200 - Michael Schuster
>> <michaelsprivate at gmail.com>:
>> 
>>>> Can you get added to sudoers?  I realize that still implies a level
>>>> of root access but I really don't know of any other way to kill
>>>> processes which don't belong to you.  I don't see why the sysadmin
>>>> would need to reboot.
>>> 
>>> most likely, being root or equivalent won't help in this case. If a
>>> processes owner cannot kill it (using -9, which cannot be caught) that
>>> implies that the process is hung in the kernel (signal delivery
>>> happens when a process leaves kernel context).
>> 
>> I got stuck in the same situation:
>> 
>> # kill -9 91651
>> # ps -o pid,jid -awux | grep 91651
>> 91651  11 root              0.0  0.0   101488   29344  -  TsJ Fri05
>> 2:10.18 /usr/local/sbin/syslog-ng -p /var/run/syslog.pid
>> 
>> and I wonder if there is anything I can do to get rid of this process.
>> I had this situation last year too and ended up in restarting the whole
>> system. But now I can't reboot.
>> 
>> Thanks
>> Ole
>> 
> 
> 
> -- 
> Michael Schuster
> http://recursiveramblings.wordpress.com/
> recursion, n: see 'recursion'
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