On Saturday 29 January 2005 13:29, Andre Majorel wrote:
> My UML's virtual consoles drop characters. If I connect to a UML
> console (E.G. "screen /dev/pts/4") and cat a small file, parts of
> it don't show. If I type too fast, some of the keystrokes are lost
> (or perhaps just not echoed, I'm not sure).
I think not echoed... please verify by typing a "echo blalalalalla" command, 
if possible. The fix I'm working on only cares about not echoed characters, 
so it is important for me to get info about this.

> The problem can be reproduced both remotely (ssh host) and locally
> (logged in at one of the hosts virtual consoles, E.G. /dev/tty2)

> Has anyone seen this ? I saw no mention of anything similar in the
> FAQ.

It's not a FAQ definitely... Rob Landley reported this not long ago, and I've 
just started fixing it.

I've found time ago a locking problem (causing race conditions) which could 
also give symptoms like the one you both see.

However, to my surprise, I've never seen reports about it until recently, when 
you both complained... what I think is that the race condition was not 
triggered before for different, timing-related changes.

I'm working on a patch on the locking issue, however that patch won't be in 
2.6.11 release because an error in the changed locking could have freezes as 
consequence.

> Running UML with con=pts con0=fd:0,fd:1. Both the UML and the host
> are version 2.6.10 from kernel.org.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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