linux-kernel - Re: [linus:master] [kasan] a414d4286f: INFO:trying_to_register_non-static

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Date: Thu, 11 Jan 2024 23:59:53 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: kernel test robot <oliver.sang@...el.com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com
Subject: Re: [linus:master] [kasan] a414d4286f:
 INFO:trying_to_register_non-static_key

Commit a414d4286f34 ("kasan: handle concurrent kasan_record_aux_stack calls")
calls raw_spin_lock_init(&alloc_meta->aux_lock) after __memset() in
kasan_init_object_meta(), but does not call raw_spin_lock_init() after __memset()
in release_alloc_meta(), resulting in lock map information being zeroed out?

We should not zero out the whole sizeof(struct kasan_alloc_meta) bytes from
release_alloc_meta() in order not to undo raw_spin_lock_init() from
kasan_init_object_meta() ?

On 2024/01/11 16:29, kernel test robot wrote:
> [    1.582812][    T0] INFO: trying to register non-static key.
> [    1.583305][    T0] The code is fine but needs lockdep annotation, or maybe
> [    1.583887][    T0] you didn't initialize this object before use?
> [    1.584409][    T0] turning off the locking correctness validator.