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Fri, 04 Jul 2025 05:41:57 -0700 (PDT) Message-ID: <37b96f5f-d79e-47bd-9616-b6c8905bc984@gmail.com> Date: Fri, 4 Jul 2025 14:40:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] kasan: remove kasan_find_vm_area() to prevent possible deadlock To: Yeoreum Yun , glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, byungchul@sk.com, max.byungchul.park@gmail.com, ysk@kzalloc.com Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev References: <20250703181018.580833-1-yeoreum.yun@arm.com> Content-Language: en-US From: Andrey Ryabinin In-Reply-To: <20250703181018.580833-1-yeoreum.yun@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: C0ADA80004 X-Rspamd-Server: rspam09 X-Stat-Signature: aoxmihjeeksbsmk6417ftpghqyxgrqja X-HE-Tag: 1751632920-870404 X-HE-Meta: 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 zwxktLWv Ct7y56noV4x+odtQHpvf8/IdCOtlyqLFSANyRMgMBSg8NGTn17RjBchRIixB2SNYGEibwL8iANO6R6/VNszc5VL0WkRXYLac1jFCF/4L5OlmDPUoIwp94FGWQosPmn11jV0K7GFY6zu9IS22t5N14zhfJAlOFGHLTWqPvtt2Dtsxnaa0cZhFwtagjMMpJ0q6bBkvHM/vrh1SpmY8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/3/25 8:10 PM, Yeoreum Yun wrote: > find_vm_area() couldn't be called in atomic_context. > If find_vm_area() is called to reports vm area information, > kasan can trigger deadlock like: > > CPU0 CPU1 > vmalloc(); > alloc_vmap_area(); > spin_lock(&vn->busy.lock) > spin_lock_bh(&some_lock); > > > spin_lock(&some_lock); > > kasan_report(); > print_report(); > print_address_description(); > kasan_find_vm_area(); > find_vm_area(); > spin_lock(&vn->busy.lock) // deadlock! > > To prevent possible deadlock while kasan reports, remove kasan_find_vm_area(). > > Fixes: c056a364e954 ("kasan: print virtual mapping info in reports") > Reported-by: Yunseong Kim > Signed-off-by: Yeoreum Yun Reviewed-by: Andrey Ryabinin