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Mon, 19 Jan 2026 02:20:13 -0800 (PST) Date: Mon, 19 Jan 2026 02:20:11 -0800 From: Breno Leitao To: Marco Elver , akpm@linux-foundation.org Cc: Alexander Potapenko , Dmitry Vyukov , Andrew Morton , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, clm@meta.com, kernel-team@meta.com Subject: Re: [PATCH] mm/kfence: fix potential deadlock in reboot notifier Message-ID: References: <20260116-kfence_fix-v1-1-4165a055933f@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: 94t4fg698buuw71fzqhq8rzsgbxyqk38 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 27A294000D X-Rspam-User: X-HE-Tag: 1768818014-891984 X-HE-Meta: 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 FDsffXe7 d/HFg5K8ZUaWwdY7acrUVybkSX2gJghQNyMPOEuYLvcnN4Iei6gaq7zrB4plLBsLfkVZDy/ObMxjfTpnTj2fDpSVZQ/Ap0Noa+7TgGKcZjSCaAG6cblsd4Nv+VYfN8cnLoCek8E/40XINMvSqt+q8jDYQUMySkhCtwEOytd7tcAW+bvu6E2Ptwy60U7sZdIoVOCpp3MAXz2o8u4m5VfdKxXfyexIts10fMoG+Y3kBCfEuDWvOhcBK5uLVImsEF9FD1KJcw9+EEvVrs+D5RI5ZLuZDNWR/x8QLZMri7sTLJ/kwACN71hCqCUMSaRCtuj8KA85hfP17OBNH8s6L/l+OibcA7jmjcvjB5uw4BIS2wyaNYTkTKgZF1umgvv4VeLrBAt/jS6HmGSnFkErpdW+WUYu77aZQZuQRAXKZ 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: Hello Marco, Andrew, On Mon, Jan 19, 2026 at 08:00:00AM +0100, Marco Elver wrote: > On Fri, 16 Jan 2026 at 16:49, Breno Leitao wrote: > > > The issue is that cancel_delayed_work_sync() waits for the work to > > complete, but the work is waiting for kfence_allocation_gate > 0 > > which requires allocations to happen (each allocation is increated by 1) > > increated -> increased [...] > Reviewed-by: Marco Elver Thanks for reviewing this patch. Andrew, Please let me know if you want to send me a v2 with the typo above fixed, or, if you can fix it in your own tree. Thanks --breno