On 08/21, Sasha Levin wrote: > > On 08/20/2014 10:12 AM, Oleg Nesterov wrote: > > On 08/20, Sasha Levin wrote: > >> > > >> > Hi all, > >> > > >> > While fuzzing with trinity inside a KVM tools guest running the latest > >> > -next > >> > kernel, I've stumbled on the following spew: > > Thanks... > > > > looks like, kill_ok_by_cred()->__task_cred(t) returns NULL at first glance. > > perhaps you can show the result of "make kernel/signal.s" to be sure? Or at > > least the full "objdump -d kernel/signal.o". > > Attached.
Thanks. Yes, t->real_cred == NULL (r14). Interestingly, t->signal is NULL too (rcx). And ->signal must be never NULL. So it looks like this task_struct was reallocated/reused. Or corrupted. t == 0xffff880546803000 (r12), this doesn't look wrong. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
