The patch titled
Subject: lockdep: allow instrumenting lockdep.c with KMSAN
has been added to the -mm mm-unstable branch. Its filename is
lockdep-allow-instrumenting-lockdepc-with-kmsan.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lockdep-allow-instrumenting-lockdepc-with-kmsan.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: lockdep: allow instrumenting lockdep.c with KMSAN
Date: Mon, 28 Nov 2022 10:45:40 +0100
Lockdep and KMSAN used to play badly together, causing deadlocks when
KMSAN instrumentation of lockdep.c called lockdep functions recursively.
Looks like this is no more the case, and a kernel can run (yet slower)
with both KMSAN and lockdep enabled. This patch should fix false
positives on wq_head->lock->dep_map, which KMSAN used to consider
uninitialized because of lockdep.c not being instrumented.
Link: https://lore.kernel.org/lkml/Y3b9AAEKp2Vr3e6O@sol.localdomain/
Link: https://lkml.kernel.org/r/20221128094541.2645890-1-glider@xxxxxxxxxx
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Reported-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/locking/Makefile | 1 -
1 file changed, 1 deletion(-)
--- a/kernel/locking/Makefile~lockdep-allow-instrumenting-lockdepc-with-kmsan
+++ a/kernel/locking/Makefile
@@ -7,7 +7,6 @@ obj-y += mutex.o semaphore.o rwsem.o per
# Avoid recursion lockdep -> sanitizer -> ... -> lockdep.
KCSAN_SANITIZE_lockdep.o := n
-KMSAN_SANITIZE_lockdep.o := n
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
revert-kmsan-unpoison-tlb-in-arch_tlb_gather_mmu.patch
lockdep-allow-instrumenting-lockdepc-with-kmsan.patch
kmsan-allow-using-__msan_instrument_asm_store-inside-runtime.patch
