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([2601:647:6700:3390::c8d1]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23506bd939asm107532785ad.70.2025.06.04.11.58.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Jun 2025 11:58:22 -0700 (PDT) From: Kuniyuki Iwashima To: luka.2016.cs@gmail.com Cc: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com Subject: Re: [Bug] task hung in rtnl_newlink in Linux kernel v6.12 Date: Wed, 4 Jun 2025 11:56:39 -0700 Message-ID: <20250604185820.147956-1-kuni1840@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luka Date: Wed, 4 Jun 2025 12:18:55 +0800 > Dear Kernel Maintainers, > > I am writing to report a potential vulnerability identified in the > upstream Linux Kernel version v6.12, corresponding to the following > commit in the mainline repository: > > Git Commit: adc218676eef25575469234709c2d87185ca223a (tag: v6.12) Please run syzkaller on the latest upstream or at least the latest LTS release. > > This issue was discovered during the testing of the Android 16 AOSP > kernel, which is based on Linux kernel version 6.12, specifically from > the AOSP kernel branch: > > AOSP kernel branch: android16-6.12 > Manifest path: kernel/common.git > Source URL: https://android.googlesource.com/kernel/common/+/refs/heads/android16-6.12 > > Although this kernel branch is used in Android 16 development, its > base is aligned with the upstream Linux v6.12 release. I observed this > issue while conducting stability and fuzzing tests on the Android 16 > platform and identified that the root cause lies in the upstream > codebase. > > > Bug Location: rtnl_newlink+0x64c/0x12f4 net/core/rtnetlink.c:3772 You can find a bunch of similar reports in the mailing list or the syzbot dashboard, where too many threads waiting for the same global mutex, e.g. https://lore.kernel.org/netdev/tencent_A3FB41E607B2126D163C5D4C87DC196E0707@qq.com/ When you don't have a repro, please make sure there is no duplicate report before posting. Thanks > > Bug Report: https://hastebin.com/share/omisagagir.bash > > Entire Log: https://hastebin.com/share/cetuxoduko.perl > > > Thank you very much for your time and attention. I sincerely apologize > that I am currently unable to provide a reproducer for this issue. > However, I am actively working on reproducing the problem, and I will > make sure to share any findings or reproducing steps with you as soon > as they are available. > > I greatly appreciate your efforts in maintaining the Linux kernel and > your attention to this matter. >