Re: BUG: soft lockup in ieee80211_tasklet_handler
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2021-03-04 08:33:01
Also in:
lkml, netdev
On Tue, 2021-03-02 at 20:01 +0100, Dmitry Vyukov wrote:
Looking at the reproducer that mostly contains just perf_event_open,
It may be the old known issue of perf_event_open with some extreme
parameters bringing down kernel.
+perf maintainers
And as far as I remember +Peter had some patch to restrict
perf_event_open parameters.
r0 = perf_event_open(&(0x7f000001d000)={0x1, 0x70, 0x0, 0x0, 0x0, 0x0,
0x0, 0x3ff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffffffe, 0x0, @perf_config_ext}, 0x0,
0x0, 0xffffffffffffffff, 0x0)Oh! Thanks for looking. Seems that also applies to https://syzkaller.appspot.com/bug?extid=d6219cf21f26bdfcc22e FWIW. I was still tracking that one, but never had a chance to look at it (also way down the list since it was reported as directly in hwsim) johannes