Re: [uml-devel] Re: Bug#260111: user-mode-linux: upgrade hangs at "NET4: Linux TCP/IP 1.0 for NET4.0 "

[Matt C. <mat...@he...>]

Jeff Dike wrote:
> 
>>Works for me.  What still bothers me is that turning on debugging
>>symbols was "fixing" it for me as well.
> 
> Yeah, this definitely needs more investigation.

Looking at the code for generic_console_write I noticed the return codes 
for tcgetattr and tcsetattr are not being checked.  After I added checks 
for the return codes, I found out that both calls to tcsetattr always 
return a non-zero status, which, according to the man pages, indicates a 
failure.  I have no idea if that is important or not.

This happens with or without the patch you supplied.

BTW: I also noticed that commenting out the second call to tcsetattr 
makes the problem go away as well.

  - Matt