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Re: vzctl enter <VEID> hangs

From: Chet Ramey
Subject: Re: vzctl enter <VEID> hangs
Date: Tue, 15 Mar 2011 12:03:03 -0400

> > So vzctl is running bash in a pty and talking to it that way?
> For the exact details I'll point to the OpenVZ guys :-). It is an OS
> virtualization patch for the kernel. With it you can run virtual servers
>  which are isolated from each other.

The answer to my question was "yes."

> What exactly do you want. A full strace report?

That's what I got, and the strace points the finger at vzctl.  It looks
like a bug in vzctl that was masked by bash-4.1 and previous versions.

> I'm trying to find the difference between 4.1.9 and 4.2.0 which causes
> this behavior, but that is not simple because I don't know the order and
> which differences  I must combine. So this process will take a while...

The difference looks to be that bash-4.1 closed fds 3-20 at startup, and
bash-4.2 sets open fds in that range to close-on-exec.  vzctl is careless
with its file descriptors, and bash not closing them results in its
controlling terminal getting messed up.

Michael Kalisz opened a bug report with the openvz group.


``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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