Linux is FAR from stable - certainly much better than other operating systems but still nowhere near approaching the rock solid behaviour of an embedded software system.
I have lost count of the number of advertising signs I have personally seen that are PC (Personal Computer) based and have either locked up or are in constant re-boot mode in public places and running Linux.
Twice now (in the last year) I have been on the Cathay flight - Cairns>Hong Kong on an Airbus 340 and the entertainment system has been down and required numerous re-boots (Linux).
Maybe all of these things are Personal Computer related problems, maybe they are Linux related - I don't know BUT what I DO KNOW is that you simply NEVER see this with embedded systems, they simply do not crash.
I'm not going to harp on about it any longer because I have pretty strong views about it - I will sit back and watch the explosions!!!