On 2011 Jul 21, at 21:35, Tim Gray wrote:
> I just upgraded my Mac to OS X 10.7.  So far I've had two kernel  
> panics,
> both times when messing around in tmux.  I *think* tmux is the one
> causing them, but what do I know :)  It could be something else.
>
> When I start the tmux session, I do see the following message:
>> warning: unsupported new OS, trying as if it were 10.6

This message comes from the use of the "reattach-to-user-namespace"  
program from

     https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard

You probably have tmux configured to run the reattach program for  
each new window (e.g. via tmux's default-command option).

Here are my suggestions:

1) Edit your .tmux.conf to remove the use of the wrapper to see if it
    makes the panics go away.

    * If the panics go away, live without the wrapper.
      It is possible (though quite unlikely, in my opinion) that Lion
      allows pbpaste to work under tmux without the wrapper.

    * If the panics do not go away, keep searching for other causes.
      Simplify your configuration. Consider starting from a brand new
      user and adding bits of your configuration (might be difficult
      since it sounds like you may not be able to reproduce the panic
      on demand).

2) Rebuild tmux and the wrapper with the Lion-native tools.

    There might be some ABI or API incompatibility with the binaries
    built on Snow Leopard.

3) Try not using tmux for a while to see if the panics subside.

4) Send your panics to Apple.

    They may not do anything with them, but they probably have the
    best chance of identifying and fixing the problem (especially if
    you can describe a way to reproduce the panic in a specific,
    stripped down configuration).

Your panic excerpt did not "ring any bells" for me.

Unfortunately, I do not have Lion and I am not able to make even a  
trail installation at this time, so I can neither attempt to  
reproduce, nor directly diagnose these panics.

-- 
Chris

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