On Wed, 21 May 2014, Borislav Petkov wrote: > > ISTM the do_machine_check code ought to consider any kill-worthy MCE > > from kernel space to be non-recoverable, but I want to keep the scope > > of these patches under control. > > MCA has a bit called RIPV which, if set, signals that RIP is valid and > it is safe to return provided we've taken proper care of handling even > non-correctable errors (memory poisoning, etc).
Yeah, but it tries to send SIGBUS from MCE context. And if MCE triggered at the time the CPU was already holding sighand->siglock for that particular task, it'll deadlock against itself. -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
