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Tue, 31 Mar 2026 06:39:01 -0700 (PDT) Message-ID: Date: Tue, 31 Mar 2026 07:39:00 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: =?UTF-8?Q?Re=3A_=5BBUG=5D_WARNING_in_io=5Fring=5Fexit=5Fwork_=28io?= =?UTF-8?B?X3VyaW5nLmM6MjE4NykgdmlhIElPUklOR19SRUdJU1RFUl9CUEZfRklMVEVSIA==?= =?UTF-8?Q?=E2=80=94_confirmed_on_7=2E0-rc5_and_rc6?= To: antonius , io-uring@vger.kernel.org Cc: asml.silence@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/31/26 7:32 AM, antonius wrote: > Hello, > > I am reporting a kernel WARNING discovered via Syzkaller fuzzing of Linux > 7.0-rc5, targeting the new IORING_REGISTER_BPF_FILTER subsystem (new in 7.0). > > The bug is confirmed on both 7.0-rc5 and 7.0-rc6. It is NOT fixed in rc6. > In rc6, the WARNING appears to have changed from WARN_ON to WARN_ON_ONCE > (fires only once per boot), which may explain why it was initially missed. Interesting, that's why I added those WARN_ON's. I'll take a look at this. And yes, they would only fire once, because are WARN_ON_ONCE()... -- Jens Axboe