Messages in this thread | | | Date | Mon, 18 Feb 2019 10:43:59 +0000 | From | Will Deacon <> | Subject | Re: [PATCH] trace: skip hwasan |
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On Sat, Feb 16, 2019 at 11:34:34PM -0500, Qian Cai wrote: > Enabling function tracer with CONFIG_KASAN_SW_TAGS=y (hwasan) tracer > causes the whole system frozen on ThunderX2 systems with 256 CPUs, > because there is a burst of too much pointer access, and then KASAN will > dereference each byte of the shadow address for the tag checking which > will kill all the CPUs. > > Signed-off-by: Qian Cai <cai@lca.pw> > --- > kernel/trace/Makefile | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile > index c2b2148bb1d2..fdd547a68385 100644 > --- a/kernel/trace/Makefile > +++ b/kernel/trace/Makefile > @@ -28,6 +28,11 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE > GCOV_PROFILE := y > endif > > +# Too much pointer access will kill hwasan. > +ifdef CONFIG_KASAN_SW_TAGS > +KASAN_SANITIZE := n > +endif
I don't maintain this file, but I think that my comments on your related patch are relevant here as well:
https://lkml.org/lkml/2019/2/18/223
Will
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