I did a few more tests. Every time when gnome hangs and I switch to console
and I try to kill Xorg, just after trying to kill Xorg, system totally hangs
and 'BUG: soft lockup detected on CPU#0!' message appear on console.
I didn't manage to reproduce 'vanishing files' effect. But I could
swear that when after resume from hibernation I created file
with 'dmesg' output for the first time,
after reboot it disappeared...
I did a few more tests. Every time when gnome hangs and I switch to console
and I try to kill Xorg, just after trying to kill Xorg, system totally hangs
and 'BUG: soft lockup detected on CPU#0!' message appear on console.
I didn't manage to reproduce 'vanishing files' effect. But I could
swear that when after resume from hibernation I created file
with 'dmesg' output for the first time,
after reboot it disappeared...