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AJvYcCVeXVdhbQpKr2f9Jth2CZM8M4IRe7zt5kYvb1URpv1jSWM06H3tyuGuV0Ct7hRko6CeL0a0nsA=@vger.kernel.org X-Gm-Message-State: AOJu0YxYAmwhOghyVk3MDJBgZodA5GSz9Ye/pPPxMtpbvtIeAuIOwJVN UIxMI6h8ik37PDm6nBvM36ofI0d0PkGHjgiIJUtgyT0WKQoBARN0UaNiWuQsSahKaWU1lfI36Vf jAg6myojCtqA2dkVWySmm3kwELyYNiWPDI0gGjW+i6n6r9T+7d3+jsQAanKY= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2d03:b0:67b:c122:d2c8 with SMTP id 006d021491bc7-67fabc982c6mr14767eaf.39.1774977447940; Tue, 31 Mar 2026 10:17:27 -0700 (PDT) Date: Tue, 31 Mar 2026 10:17:27 -0700 In-Reply-To: <000000000000bd671b06222de427@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69cc01a7.050a0220.183828.002d.GAE@google.com> Subject: Re: [syzbot] [net] INFO: task hung in tun_chr_close (5) From: syzbot To: andrew+netdev@lunn.ch, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, jason@zx2c4.com, jasowang@redhat.com, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, mail@country-targeted-traffic.com, netdev@vger.kernel.org, newsletter@monkeydigitaldeals.com, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, vinicius.gomes@intel.com, willemdebruijn.kernel@gmail.com, wireguard@lists.zx2c4.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 47ab2c12c87a Merge branch 'correct-bd-length-masks-and-bql.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=153aed02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91 dashboard link: https://syzkaller.appspot.com/bug?extid=b0ae8f1abf7d891e0426 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1286e8d2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=106df5da580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/289234295ce6/disk-47ab2c12.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b3f30eb7dc01/vmlinux-47ab2c12.xz kernel image: https://storage.googleapis.com/syzbot-assets/62a0f5642c08/bzImage-47ab2c12.xz The issue was bisected to: commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 Author: Vinicius Costa Gomes Date: Sat Sep 29 00:59:43 2018 +0000 tc: Add support for configuring the taprio scheduler bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11535418580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13535418580000 console output: https://syzkaller.appspot.com/x/log.txt?x=15535418580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b0ae8f1abf7d891e0426@syzkaller.appspotmail.com Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler") INFO: task syz-executor:5978 blocked for more than 143 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:22400 pid:5978 tgid:5978 ppid:1 task_flags:0x40054c flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 tun_detach drivers/net/tun.c:634 [inline] tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.