2012/10/25 Sergey Senozhatsky <[email protected]>: > On (10/25/12 09:06), Frederic Weisbecker wrote: >> >> > My understanding is (I may be wrong) that we can schedule() from ptrace >> >> > chain to >> >> > some arbitrary task, which will continue its execution from the point >> >> > where RCU assumes >> >> > CPU as not idle, while CPU in fact still in idle state -- no one said >> >> > rcu_idle_exit() >> >> > (or similar) prior to schedule() call. >> >> >> >> Yeah but when we are in syscall_trace_leave(), the CPU shouldn't be in >> >> RCU idle mode. That's where the bug is. How do you manage to trigger >> >> this bug? >> >> >> > >> > strace -f <anything> >> >> I can't reproduce. Can you send me your config? >> > > sure, attached.
Thanks. Sergey, Dave, Does the patch I just sent you fix the issue? Patch is "[PATCH] rcu: Fix unrecovered RCU user mode in syscall_trace_leave()" Thanks. -- 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/
