On 2018-10-10 11:15:46 [+0200], Philipp K wrote: > Hi, Hi, sorry for being late. > I've been fuzzing linux-rt with syzkaller and found a way to trigger > $title warning. > > The reproducer works with a defconfig + CONFIG_NET_KEY=y on 4.18.12-rt6 kernel. I didn't manage to reproduce this on v4.19-RT. Also that backtrace is from v4.9. With that test case I didn't manage to end up in cryptomgr_probe() which would be a requirement. So. The warning says that the system managed to wake up 5 tasks in one go, that is without re-enabling the interrupts. It has been agreed that two wakes are okay and more should be avoided. The problem is that it may cause latency spikes if for some reason the system wakes say 100 tasks like that. We have one exception for the PM case because nobody does (or should do) suspend-to-ram and run a RT task which has to meet a deadline. So for this case, we should figure out why it managed to wake 5 tasks and how bad can it get and can we limit it somehow. > Philipp > > PS: Liebe Grüße von Lukas Bulwahn Ah. Greetings! Sebastian
