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([2620:10d:c092:600::1:4dfd]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae3f6ac679esm854716966b.104.2025.07.08.01.22.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Jul 2025 01:22:50 -0700 (PDT) Message-ID: <9bfb10a9-0400-461f-af4d-54946455e74c@gmail.com> Date: Tue, 8 Jul 2025 09:24:18 +0100 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [fs?] INFO: task hung in do_coredump (3) To: syzbot , anna-maria@linutronix.de, axboe@kernel.dk, brauner@kernel.org, frederic@kernel.org, gregkh@linuxfoundation.org, hdanton@sina.com, io-uring@vger.kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, tj@kernel.org, viro@zeniv.linux.org.uk References: <686bf556.a70a0220.29fe6c.0b0e.GAE@google.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <686bf556.a70a0220.29fe6c.0b0e.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/7/25 17:27, syzbot wrote: > syzbot has bisected this issue to: > > commit 2af89abda7d9c2aeb573677e2c498ddb09f8058a > Author: Pavel Begunkov > Date: Thu Aug 24 22:53:32 2023 +0000 > > io_uring: add option to remove SQ indirection Doesn't look like the cause, the previous repro from 28 Oct 2024 didn't even have any io_uring, and the patch only reduces sizes of some allocations. The common part b/w programs is prctl(PR_SET_SYSCALL_USER_DISPATCH_ON), might be related to that. > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14ec9582580000 > start commit: 05df91921da6 Merge tag 'v6.16-rc4-smb3-client-fixes' of gi.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=16ec9582580000 > console output: https://syzkaller.appspot.com/x/log.txt?x=12ec9582580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=45bd916a213c79bb > dashboard link: https://syzkaller.appspot.com/bug?extid=a8cdfe2d8ad35db3a7fd > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a2228c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d48bd4580000 > > Reported-by: syzbot+a8cdfe2d8ad35db3a7fd@syzkaller.appspotmail.com > Fixes: 2af89abda7d9 ("io_uring: add option to remove SQ indirection") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection -- Pavel Begunkov