Re: [vserver] kill -9 1 doesn't work?

From: Herbert Poetzl <herbert_at_13thfloor.at>
Date: Tue 04 Sep 2012 - 15:18:29 BST
Message-ID: <20120904141829.GB3371@MAIL.13thfloor.at>

On Tue, Sep 04, 2012 at 08:39:25AM +0200, Wilhelm wrote:
> Am 03.09.2012 21:28, schrieb Herbert Poetzl:
>> On Fri, Aug 31, 2012 at 09:19:52AM +0200, Wilhelm wrote:
>>> Hi all,

>>> as a last resort to stop upstart-based vserver it tries to
>>> modifiy sendsigs to issue a

>>> kill -9 1

>>> But this doesn't work from inside a vserver.
>>> From host a vkill ... is ok.
>>> Looks like the syscall is somehow redirected.

>> kernel, patch and util-vserver version?

> root@kmux-host:~# vserver-info
> Versions:
> Kernel: 3.4.5-030405-kmux-pae

still leaves the patch version unclear, probably one of
vs2.3.3.4, vs2.3.3.5, vs2.3.3.6 or vs2.3.3.7, where my
bet would be on vs2.3.3.5

what is the kmux and pae extension?

> VS-API: 0x00020308
> VCI: 0x0000000013001f01
> util-vserver: 0.30.216-pre3004; Aug 30 2012, 14:00:04

> Features:
> CC: gcc, gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
> CPPFLAGS: ''
> CFLAGS: '-g -O2 -std=c99 -Wall -pedantic -W
> -funit-at-a-time'
> build/host: i686-pc-linux-gnu/i686-pc-linux-gnu
> Use dietlibc: yes
> Build C++ programs:
> Build C99 programs: yes
> Available APIs: v13,net,v21,v22,v23,netv2
> ext2fs Source: e2fsprogs
> syscall(2) invocation: alternative
> vserver(2) syscall#: 273/glibc
> crypto api: nss
> python bindings: yes
> use library versioning: yes

> Paths:
> prefix: /usr
> sysconf-Directory: /etc
> cfg-Directory: /etc/vservers
> initrd-Directory: $(sysconfdir)/init.d
> pkgstate-Directory: ${prefix}/var/run/vservers
> vserver-Rootdir: /vservers

> Assumed 'SYSINFO' as no other option given; try '--help' for more
> information.
> root@kmux-host:~#

>> and what config has the guest regarding init?

> plain

okay, will do some tests with the latest kernels
in this regard, but I assume the guest is behaving
like the host would, because the init process is
protected against such signals (on host and guest)

best,
Herbert

>>> Any hints to enable this?

>> really depends on the kernel implementation,
>> but usually you need to override checks in
>> kill_something_info()

>> HTH,
>> Herbert

>>> --
>>> Wilhelm

> --
> Wilhelm
Received on Tue Sep 4 15:18:38 2012

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