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Bash 4.2 problem? [message #41893]

Thu, 24 February 2011 13:07

hvdkamer
Messages: 40
Registered: July 2006

Member

I've compiled and installed the new Bash 4.2 in a container. When I try to get access from the physical server I get:

hoefnix2:~# vzctl enter 50

Indeed, no errors, but also no prompt from the container. When I revert to Bash 4.1 and patchlevel 009 everything works again. From a different console on the physical server or from a SSH login in the virtual server I can see that in the container Bash is started and that there is a pts. However after that point it freezes and a Ctrl-c gives back the prompt on the physical server.

Any suggestions are appreciated...

Henk van de Kamer
auteur Het Lab
http://www.hetlab.tk/

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Re: Bash 4.2 problem? [message #41915 is a reply to message #41893]

Thu, 24 February 2011 14:22

hvdkamer
Messages: 40
Registered: July 2006

Member

I've installed strace to investigate further:

hoefnix2:~# strace vzctl enter 60
...
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2b65860859d0) = 29577
close(3)                                = 0
close(7)                                = 0
close(9)                                = 0
close(10)                               = 0
read(8,

With bash 4.1 patchlevel 009 I get:

clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2af2938ab9d0) = 2972
close(3)                                = 0
close(7)                                = 0
close(9)                                = 0
close(10)                               = 0
read(8, "", 4)                          = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
...

Hope that someone sees the problem and may be even a soultion Smile

Henk van de Kamer
auteur Het Lab
http://www.hetlab.tk/

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Re: Bash 4.2 problem? [message #42189 is a reply to message #41893]

Wed, 16 March 2011 09:40

hvdkamer
Messages: 40
Registered: July 2006

Member

After investigation by the maintainer of Bash it is decided that this is a bug in vzctl. Hope this wil be fixed soon Smile

.

At the moment the owner of a virtual machine can block the owner of the physical machine to use the vzctl enter command to gain access. For some these coluld be nice, but it also blocks an easy way to help a problematic virtual machine to its feet again...

Henk van de Kamer
auteur Het Lab
http://www.hetlab.tk/

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Re: Bash 4.2 problem? [message #42193 is a reply to message #42189]

Wed, 16 March 2011 17:17

curx
Messages: 739
Registered: February 2006
Location: Nürnberg, Germany

Senior Member

Hi Henk,

have you tested the last git commit:

http://git.openvz.org/?p=vzctl;a=commitdiff;h=e7c40ee697606e43d6242fd3c124e370588ae26f

Bye,
Thorsten

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Re: Bash 4.2 problem? [message #42194 is a reply to message #42193]

Wed, 16 March 2011 17:53

hvdkamer
Messages: 40
Registered: July 2006

Member

I've just found this patch and busy to setup a test for it Smile

Henk van de Kamer
auteur Het Lab
http://www.hetlab.tk/

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Re: Bash 4.2 problem? [message #42195 is a reply to message #41893]

Wed, 16 March 2011 18:00

hvdkamer
Messages: 40
Registered: July 2006

Member

hoefnix2:~# vzctl enter 60
entered into CT 60
ve60:/# pacman -Q bash
bash 4.2.008-1

This patch solves the problem.

Henk van de Kamer
auteur Het Lab
http://www.hetlab.tk/

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