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Mon, 12 Jan 2026 21:38:25 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 5717074456672 X-SMAIL-UIID: E3D100460EB94DECAB4859F73DA2DC40-20260112-213825-1 From: Hillf Danton To: kartikey406@gmail.com Cc: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, urezki@gmail.com Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in purge_vmap_node Date: Mon, 12 Jan 2026 21:38:13 +0800 Message-ID: <20260112133815.2190-1-hdanton@sina.com> In-Reply-To: <6964f35e.050a0220.eaf7.00a5.GAE@google.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: np59ww6au7b3wi6g8c7yq7mhamfyx9sa X-Rspamd-Queue-Id: 5FF20A0003 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1768225111-983186 X-HE-Meta: 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 an1d9Rd2 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 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: > Date: Mon, 12 Jan 2026 05:13:02 -0800 > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > INFO: rcu detected stall in x64_sys_call > Given the test result of your patch, can you specify the root cause of the stall reported, Deepanshu?