On Fri, 22 Nov 2019 at 12:27, <glider@xxxxxxxxxx> wrote: > > KMSAN doesn't currently support UNWINDER_ORC, causing the kernel to > freeze at boot time. > See http://github.com/google/kmsan/issues/48. The Github issues doesn't mention much else -- it might be useful for future people to elaborate why it doesn't work? If it is unclear why it doesn't work, then it's fine to mention this in commit message as well I suppose. > Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> > Cc: Qian Cai <cai@xxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > Cc: Harry Wentland <harry.wentland@xxxxxxx> > Cc: Vegard Nossum <vegard.nossum@xxxxxxxxxx> > Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > Cc: linux-mm@xxxxxxxxx > > --- > This patch is part of "kmsan: Kconfig changes to disable options > incompatible with KMSAN", which was split into smaller pieces. > > Change-Id: I9cb6ebbaeb9a38e9e1d015c68ab77d40420a7ad0 > --- > arch/x86/Kconfig.debug | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug > index bf9cd83de777..db3cd6147829 100644 > --- a/arch/x86/Kconfig.debug > +++ b/arch/x86/Kconfig.debug > @@ -292,6 +292,9 @@ choice > config UNWINDER_ORC > bool "ORC unwinder" > depends on X86_64 > + # KMSAN doesn't support UNWINDER_ORC yet, > + # see https://github.com/google/kmsan/issues/48. > + depends on !KMSAN > select STACK_VALIDATION > ---help--- > This option enables the ORC (Oops Rewind Capability) unwinder for > -- > 2.24.0.432.g9d3f5f5b63-goog >
