On Fri, 22 Nov 2019 at 12:27, <glider@xxxxxxxxxx> wrote: > > KMSAN doesn't currently support lock debugging, causing the kernel to > enter infinite recursion at boot time. > See https://github.com/google/kmsan/issues/57. > > Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> > Cc: Eric Biggers <ebiggers@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. > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 75c36318943d..a3f6f5d68593 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -1068,6 +1068,9 @@ menu "Lock Debugging (spinlocks, mutexes, etc...)" > config LOCK_DEBUGGING_SUPPORT > bool > depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT > + # KMSAN is incompatible with lockdep, > + # see https://github.com/google/kmsan/issues/57. > + depends on !KMSAN > default y > > config PROVE_LOCKING > > Change-Id: I4f97edc8a02d8ca208fc914e55e8f0c23d74eac8 > --- > lib/Kconfig.debug | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 75c36318943d..a3f6f5d68593 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -1068,6 +1068,9 @@ menu "Lock Debugging (spinlocks, mutexes, etc...)" > config LOCK_DEBUGGING_SUPPORT > bool > depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT > + # KMSAN is incompatible with lockdep, > + # see https://github.com/google/kmsan/issues/57. Does it make sense to get this working? Or rather, is it feasible to get working? If not, I would just remove the reference to the Github issue, and declare that KMSAN is incompatible with lockdep. > + depends on !KMSAN > default y > > config PROVE_LOCKING > -- > 2.24.0.432.g9d3f5f5b63-goog >
