From: Marcelo Ricardo Leitner <mleitner@xxxxxxxxxx> Date: Mon, 13 Oct 2014 14:03:30 -0300 > Further tests revealed that after moving the garbage collector to a work > queue and protecting it with a spinlock may leave the system prone to > soft lockups if bottom half gets very busy. > > It was reproced with a set of firewall rules that REJECTed packets. If > the NIC bottom half handler ends up running on the same CPU that is > running the garbage collector on a very large cache, the garbage > collector will not be able to do its job due to the amount of work > needed for handling the REJECTs and also won't reschedule. > > The fix is to disable bottom half during the garbage collecting, as it > already was in the first place (most calls to it came from softirqs). > > Signed-off-by: Marcelo Ricardo Leitner <mleitner@xxxxxxxxxx> > Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx> > Acked-by: David S. Miller <davem@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx -stable folks, please integrate this directly, thanks! -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html