Bug? Jailkit / chroot crashed server

[till]

May you please check with "ls -la" if /bin/bash and /bin/sh are files or symlinks inside the crashed system. If they are symlinks, please check if the files that the symlinks point to exist.

[till]

To all posters in this thread: May you please confirm to me that you are using jailkit 2.8 on your systems that had these problems.

[xerc]

I used JailKit 2.8

/bin/bash and /bin/sh were files, no symlinks

[till]

Is this a 32bit or 64bit linux system?

Below in the quoted area a few questions from Olivier. Please try to run the suggested comands on the binaries from the broken system and report the results.

possibly the library loader (/lib/ld-linux.so.2) is corrupt, or it is a
dangling symlink ? That could cause a 'no such file or directory' error.

what does 'file /bin/bash' report? what does `ldd /bin/bash` report?

does someone have a virtual machine which can be used to reproduce the
problem? (I've tried on Ubuntu 9.04 but I found no problems)

[xerc]

It is 64 bit.

All files and all symlinks where correct.

I'm currently reinstalling the server because we need it so much, could not wait any longer, but I still have the HD Dump.


file bash

bash: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped

static:~/rescue_backup/rescue/bin# ldd bash

static:~/rescue_backup/rescue/bin# ldd bash
        linux-vdso.so.1 =>  (0x00007fffb61fe000)
        libncurses.so.5 => /lib/libncurses.so.5 (0x00007f5aadc8c000)
        libdl.so.2 => /lib/libdl.so.2 (0x00007f5aada88000)
        libc.so.6 => /lib/libc.so.6 (0x00007f5aad735000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f5aadecb000)

[till]

I was able to reproduce the problem now. It occurs only on 64Bit systems. I'am just preparing a virtual machine image to send it to Olivier.

[till]

The problem in jailkit has been fixed. The current CVS version of jailkit is working fine for me now and Olivier will release a fixed jailkit version soon. To get the fixed cvs release, use this command:

cvs -z3 -d:pserver:anonymous@cvs.savannah.nongnu.org:/sources/jailkit co jailkit

and then run ./configure && make && make install

inside the jailkit directory.

If you have a 64Bit test system, it would be great if you might be able to test it. We have also found a typo in the jk_init.ini file which is delivered by ispconfig, this is not related directly to the problem in this thread but as the CVS version of jailkit has a better config file parser, it complains about the syntax error in the old file. This has been fixed in ispconfig SVN too and I attached the fixed file as .zip to this post here too.

Description of the error and possible solutions to make the system accessible again:

There was a error in the jailkit scripts in jailkit 2.8 that copy the system librarys which only affects directorys or files that are symlinked. In Debian and Ubuntu 64 bit, the lib64 directory is a symlink to the lib directory which causes the librarys in lib to be oevrwritten or removed. A possible solution to to make a broken system accessible again is to copy the librarys in lib from a working linux system or rescue cd (must be the same version and distribution of course) to your broken system and then reboot.

[sh1ny]

Thanks, i will test this on a virtual machine soon.

[till]

Thanks. Please let me know if it works.

Here is a download link for the upcoming ISPConfig 3.0.1.6 which contains the changed jk_init.ini file and some fixes in the update script.

http://www.ispconfig.org/downloads/I...-stable.tar.gz

[Nikola]

is new version

14-10-2009: Jailkit 2.9 released.

http://olivier.sessink.nl/jailkit/index.html#news