parasite-syscall: describe task's state on trap failure
parasite-syscall: describe task's state on trap failure

I think we can improve error messages to distinguish task's kills
from segfaults from ptrace failures & etc.

Signed-off-by: Dmitry Safonov <5aea3f9692c8a01793193334616ae8fad2bc748a@virtuozzo.com>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,efiop/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,efiop/criu,efiop/criu,eabatalov/criu,eabatalov/criu,efiop/criu,KKoukiou/criu-remote,efiop/criu,eabatalov/criu,efiop/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu