Hi. After pptp connection is established my 2.6.31 system freezes while 2.6.30 works as expected. Bissecting gave me the following result: commit ac89a9174decf343de049a06fad75681f71890eb Author: Linus Torvalds Date: Sat Sep 5 13:27:10 2009 -0700 pty: don't limit the writes to 'pty_space()' inside 'pty_write()' and looks like reverting this patch from 2.6.31 fixes the problem. Other observations: It's hard to say when exactly system hangs - it hangs not immediatly, sometimes when I try to send some traffic, sometimes when I switch ppp connection off. Hang is not complete: mouse cursor keeps moving in Xorg, but every click gets no respond, I'm unable to start new programs, in open xconsoles it's possible to input something but after I press enter consoles hang too. Also there is no way out of X (ctrl+alt+FN combo does not work) and connected to this computer ssh consoles hang too (again, it's possible to put ls there but after that it hangs). No new ssh connections possible due to time out. In hope to get any oops I've started netconsole but at hang no new ouput was there. I've managed to gather some information with SysRq (it's gzipped in attachment) but I'm not sure how useful it is. I've tried to establish pptp connection both over wireless and wired connections and system hanged with both, so it looks like networking drivers are not the reason here. BTW, I'm using networkmanager to establish connection. gzipped kernel config is in attachment. Is this problem known? Does anybody experience same problem? Do you have a fix? :) -- Peter.