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From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Wed 07 Sep 2005 - 02:12:41 BST


On Tue, Sep 06, 2005 at 11:35:42AM +0200, Dennis Roos wrote:
> Hi,
>
> By accident I ran into a crash of the complete host (nicely reboots
> luckily), but still... I can reproduce this on the same setup, different
> hardware.

I'm interested! :)

could you verify a few things for me?

 a) does it happen with vs2.0 too (same configs)?
 b) does it help to revert the grsec patches?
 c) does it happen if you do not start the guest?

TIA,
Herbert

> Versions:
> Kernel: 2.6.11.6-grsec-vs1.9.5
> VS-API: 0x00010025
> util-vserver: 0.30.196; Apr 5 2005, 16:20:45
>
> Features:
> CC: i686-pc-linux-gnu-gcc, i686-pc-linux-gnu-gcc
> (GCC) 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)
> CXX: i686-pc-linux-gnu-g++, i686-pc-linux-gnu-g++
> (GCC) 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)
> CPPFLAGS: ''
> CFLAGS: '-O2 -march=i686 -fomit-frame-pointer
> -std=c99 -Wall -pedantic -W'
> CXXFLAGS: '-O2 -march=i686 -fomit-frame-pointer -ansi
> -Wall -pedantic -W -fmessage-length=0'
> build/host: i686-pc-linux-gnu/i686-pc-linux-gnu
> Use dietlibc: yes (0.28)
> Build C++ programs: yes
> Build C99 programs: yes
> Available APIs: compat,v11,v13,fscompat,net,oldproc,olduts
> ext2fs Source: e2fsprogs
> syscall(2) invocation: fast
> vserver(2) syscall#: 273/default
>
> Paths:
> prefix: /usr
> sysconf-Directory: /etc
> cfg-Directory: /etc/vservers
> initrd-Directory: /etc/init.d
> pkgstate-Directory: /var/run/vservers
> Kernelheaders: /usr/include
> vserver-Rootdir: /vservers
>
>
> VServer configuration:
> /etc/vservers/IT_MONITOR/apps/init/style:gentoo
> /etc/vservers/IT_MONITOR/interfaces/0/dev:eth1
> /etc/vservers/IT_MONITOR/interfaces/0/ip:XXX.XXX.XXX.82
> /etc/vservers/IT_MONITOR/interfaces/0/mask:255.255.255.0
> /etc/vservers/IT_MONITOR/interfaces/0/name:0IT_MONITOR
> /etc/vservers/IT_MONITOR/interfaces/0/prefix:24
> /etc/vservers/IT_MONITOR/interfaces/1/dev:lo
> /etc/vservers/IT_MONITOR/interfaces/1/ip:127.0.0.1
> /etc/vservers/IT_MONITOR/interfaces/1/mask:255.255.255.255
> /etc/vservers/IT_MONITOR/interfaces/1/name:1IT_MONITOR
> /etc/vservers/IT_MONITOR/interfaces/1/prefix:32
> /etc/vservers/IT_MONITOR/uts/nodename:it_monitor.mydomain.com
> /etc/vservers/IT_MONITOR/uts/release:2.6.10
> /etc/vservers/IT_MONITOR/flags:lock
> /etc/vservers/IT_MONITOR/flags:nproc
> /etc/vservers/IT_MONITOR/fstab:none /proc proc defaults
> 0 0
> /etc/vservers/IT_MONITOR/fstab:none /dev/pts devpts
> gid=5,mode=620 0 0
> /etc/vservers/IT_MONITOR/fstab:#none /tmp tmpfs
> size=16m,mode=1777 0 0
> /etc/vservers/IT_MONITOR/name:IT_MONITOR
> /etc/vservers/IT_MONITOR/context:82
> /etc/vservers/IT_MONITOR/ccpabilities:CAP_NET_RAW
>
> A couple of notes on the config:
> # ccapabilities CAP_NET_RAW are needed because this vserver is supposed
> to monitor our equipment using ping, traceroute, etc.
> # device 1 (127.0.0.1) was needed because nagios (the monitoring
> application) does some hardcoded check on 127.0.0.1 :( and I am too lazy
> to fix this.
>
> What happens...
> On the host I decided to run `route add -host 1.2.3.4 reject`
> I enter the vserver and run netstat -rn (normally runs smoothly)
> `netstat -rn`
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt
> Iface
> Read from remote host XXX.XXX.XXX.55: Connection reset by peer
> Connection to XXX.XXX.XXX.55 closed.
>
> Whah! The machine dies, and reboots
>
>
>
> --
> Regards,
> Dennis Roos
>
> Network Engineer @ InTouch N.V.
> Middenweg 76
> 1097 BS Amsterdam
> Tel: +31 (0)20 6752060
> Fax: +31 (0)20 6758429
>
> -=[Assumption is the mother of all f*ckups]=-
>
>
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