Ccing Oleg and Sergey On Tue, Nov 05, 2013 at 05:27:29PM -0800, David Rientjes wrote: > On Tue, 5 Nov 2013, Luigi Semenzato wrote: > > > It's not enough to hold a reference to the task struct, because it can > > still be taken out of the circular list of threads. The RCU > > assumptions don't hold in that case. > > > > Could you please post a proper bug report that isolates this at the cause? > Hi David! I think it has already been reported[1] and actively discussed. Oleg has confirmed that while_each_thread() is not safe under rcu_read_lock()[2]. Oleg, any news about your activity for fixing that? [1] http://www.spinics.net/lists/linux-mm/msg54836.html [2] http://marc.info/?l=linux-kernel&m=127688978121665 > Thanks. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>