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From: Eric Biggers <ebiggers@kernel.org>
To: Alexander Potapenko <glider@google.com>,
	Marco Elver <elver@google.com>,
	Dmitry Vyukov <dvyukov@google.com>
Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: KMSAN broken with lockdep again?
Date: Wed, 16 Nov 2022 12:12:31 -0800	[thread overview]
Message-ID: <Y3VEL0P0M3uSCxdk@sol.localdomain> (raw)

Hi,

I'm trying v6.1-rc5 with CONFIG_KMSAN, but the kernel continuously spams
"BUG: KMSAN: uninit-value in __init_waitqueue_head".

I tracked it down to lockdep (CONFIG_PROVE_LOCKING=y).  The problem goes away if
I disable that.

I don't see any obvious use of uninitialized memory in __init_waitqueue_head().

The compiler I'm using is tip-of-tree clang (LLVM commit 4155be339ba80fef).

Is this a known issue?

- Eric

             reply	other threads:[~2022-11-16 20:12 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-16 20:12 Eric Biggers [this message]
2022-11-17 13:46 ` KMSAN broken with lockdep again? Alexander Potapenko
2022-11-18  3:33   ` Eric Biggers
2022-11-18 13:39     ` Alexander Potapenko
2022-11-18 18:19       ` Alexander Potapenko

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