From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A1BFF30147E for ; Mon, 27 Oct 2025 21:07:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761599259; cv=none; b=K39+mxr+/q5TrD5tZDem+jvgIj54In/8vbEv9DAKGnBf+cPSnbM2CwtGMvzz389oeilgQYGpx7bn3easYSlMpjPzu/7hfRmCu1hlIZc9fB4otG9uITr9rifRihJ/zug/1Q714DEu6NFqB4C7PUplQvjSlJMoq4gpKZYPMWalEZY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761599259; c=relaxed/simple; bh=Cz1eSevpD/I1LrsIrUBNouhdxHno4nqx0TPkX3bxatk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=XKKnF0qdGjBhtT3xq4lzPIk9zjGRJ9O+6Hz9VgOlLjV9aSgiuw5hculesaT/ObSkkBNHtYqmJQ6smEo6tAExM154CpzF8ZKvxNt4Sm1PFRRLLFFHVBn9JB1ttoTH2IZGhbhgveJBM4f+rxf5ZK5Llk2z5o7ZUIuWv7GxJVeiU2Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f205.google.com with SMTP id e9e14a558f8ab-431d999ebe8so164794145ab.1 for ; Mon, 27 Oct 2025 14:07:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761599257; x=1762204057; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=yJd309KA2t9tYlphuKW1GClsIxItIY6mqSvUQYS2sUs=; b=NQj0QOv3IOlPfGi6cPs6DtdLaVpXlNs6LnT6oDPcJkcdaNfqR6EmvCEl0LQotbF4V0 ZQAS0bClZ3k199MyhucvP7l1h9hN71psSSWZ9c7I3unqegcjrad4gC7EKlZelNaDiMLI cNQCEnztKIXbJNNhAj1vSc0SCU+yHKEPS3T+esSMKcG1BJz2Sk8AZjQ2fV8qFAvKhgZn HWJdm7Jjm19qSQeHR5yTTcZr+iRSRzweOqAYPPbE+3hcqpA8eHmm8X8z+yJ3kcSbnsKd J1O8tuYWnzPQB8IO50xeV1HVlJhux0OTafo7kUq8xnLtOIFr3pBnHyuQUMLvyjiwn0a0 qc0Q== X-Forwarded-Encrypted: i=1; AJvYcCUf8LgjeW71Y+KN5kJemPT48jFEn1gBRU44sXi5U7aJFW58sVrIesDymdyz7x3pqNqKx1Jq3hZQ3g==@vger.kernel.org X-Gm-Message-State: AOJu0YxEyp12PhNxX1h/bYdC8oVcf/DJ6hnfO9bqQXhc3G9HK4gzI8Ab y3vaKHwNz4owCqYBrdNR4EkSgxOtiVybrgND0Zslu+FU1JMkhAySv9y0z691XK6bMaLXdH5vUk0 YwDj08t5mW6ealLRnnAHZMNu14aedxNx2b2/Yy0rvxX8Fcf1gtqXfiUM0Sp4= X-Google-Smtp-Source: AGHT+IHtrFJtB1irmumn5zkk/+lgIGRIIa8XaCwkJxPDXeOqp5K9BJ4Wwid1E2uNB6608tP8V/0rswSH123NiE1cwuSJBd1iG3H2 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:cdab:0:b0:431:d951:ab9b with SMTP id e9e14a558f8ab-4320f685ff3mr22239925ab.0.1761599256723; Mon, 27 Oct 2025 14:07:36 -0700 (PDT) Date: Mon, 27 Oct 2025 14:07:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ffdf18.050a0220.3344a1.039e.GAE@google.com> Subject: [syzbot] [io-uring?] INFO: task hung in io_uring_del_tctx_node (5) From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 72fb0170ef1f Add linux-next specific files for 20251024 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13087be2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e812d103f45aa955 dashboard link: https://syzkaller.appspot.com/bug?extid=10a9b495f54a17b607a6 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14725d2f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11233b04580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/be1fa3d1f761/disk-72fb0170.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/57302bf7af40/vmlinux-72fb0170.xz kernel image: https://storage.googleapis.com/syzbot-assets/91c806bb2a2b/bzImage-72fb0170.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+10a9b495f54a17b607a6@syzkaller.appspotmail.com INFO: task syz.0.17:6027 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.0.17 state:D stack:25752 pid:6027 tgid:6026 ppid:5955 task_flags:0x400548 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5254 [inline] __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862 __schedule_loop kernel/sched/core.c:6944 [inline] schedule+0x165/0x360 kernel/sched/core.c:6959 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 io_uring_clean_tctx+0xd4/0x1a0 io_uring/tctx.c:195 io_uring_cancel_generic+0x6ca/0x7d0 io_uring/io_uring.c:3363 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x345/0x2300 kernel/exit.c:912 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f887d98efc9 RSP: 002b:00007f887e743038 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 00007f887dbe5fa0 RCX: 00007f887d98efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f887da11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f887dbe6038 R14: 00007f887dbe5fa0 R15: 00007ffda9831b38 INFO: task syz.1.18:6058 blocked for more than 145 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:28104 pid:6058 tgid:6057 ppid:6038 task_flags:0x400548 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5254 [inline] __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862 __schedule_loop kernel/sched/core.c:6944 [inline] schedule+0x165/0x360 kernel/sched/core.c:6959 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 io_uring_clean_tctx+0xd4/0x1a0 io_uring/tctx.c:195 io_uring_cancel_generic+0x6ca/0x7d0 io_uring/io_uring.c:3363 io_uring_files_cancel include/linux/io_uring.h:19 [inline] do_exit+0x345/0x2300 kernel/exit.c:912 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f37d438efc9 RSP: 002b:00007f37d5232038 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 00007f37d45e5fa0 RCX: 00007f37d438efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f37d4411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f37d45e6038 R14: 00007f37d45e5fa0 R15: 00007ffc85237d08 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e13d5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13d5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8e13d5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:3/37: #0: ffff88813fe69948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline] #0: ffff88813fe69948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346 #1: ffffc90000ad7ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline] #1: ffffc90000ad7ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346 #2: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303 3 locks held by kworker/u8:7/3579: #0: ffff88802f51d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline] #0: ffff88802f51d148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346 #1: ffffc9000c717ba0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline] #1: ffffc9000c717ba0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346 #2: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0 net/ipv6/addrconf.c:4194 2 locks held by getty/5585: #0: ffff8880344d50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 1 lock held by syz.0.17/6027: #0: ffff888031ece0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.0.17/6030: 1 lock held by syz.1.18/6058: #0: ffff88802faa20a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.1.18/6059: 1 lock held by syz.2.19/6082: #0: ffff88802840c0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.2.19/6083: 1 lock held by syz.3.20/6106: #0: ffff8880338140a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.3.20/6107: 1 lock held by syz.4.21/6142: #0: ffff8880611da0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.4.21/6143: 1 lock held by syz.5.22/6172: #0: ffff88801f7c00a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.5.22/6173: 1 lock held by syz.6.23/6204: #0: ffff88805b6440a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.6.23/6205: 1 lock held by syz.7.24/6242: #0: ffff8880301c60a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_del_tctx_node+0xf0/0x2c0 io_uring/tctx.c:179 3 locks held by syz.7.24/6243: 3 locks held by syz-executor/6246: #0: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8f4edb48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8e9/0x1c80 net/core/rtnetlink.c:4064 #1: ffff88807b9c1528 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50 #2: ffffffff8e143038 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #2: ffffffff8e143038 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:957 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:337 [inline] watchdog+0xfa9/0xff0 kernel/hung_task.c:500 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6107 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:kasan_check_range+0x1d4/0x2c0 mm/kasan/generic.c:200 Code: 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 4e d8 2e 09 cc 45 84 ff 75 63 41 f7 RSP: 0018:ffffc9000383f7b0 EFLAGS: 00000256 RAX: ffffffff82431501 RBX: 0000000000000018 RCX: ffffffff824315fd RDX: 0000000000000001 RSI: 0000000000000018 RDI: ffffc9000383f880 RBP: 0000000000000000 R08: ffffc9000383f897 R09: 1ffff92000707f12 R10: dffffc0000000000 R11: fffff52000707f13 R12: 0000000000000003 R13: ffff888079527128 R14: fffff52000707f13 R15: 1ffff92000707f10 FS: 00007f4e567906c0(0000) GS:ffff888125cdc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055db9a726918 CR3: 000000002ec48000 CR4: 00000000003526f0 Call Trace: __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 seq_printf+0xad/0x270 fs/seq_file.c:403 __io_uring_show_fdinfo io_uring/fdinfo.c:142 [inline] io_uring_show_fdinfo+0x734/0x17d0 io_uring/fdinfo.c:256 seq_show+0x5bc/0x730 fs/proc/fd.c:68 seq_read_iter+0x4ef/0xe20 fs/seq_file.c:230 seq_read+0x369/0x480 fs/seq_file.c:162 vfs_read+0x200/0xa30 fs/read_write.c:570 ksys_read+0x145/0x250 fs/read_write.c:715 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4e5598efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4e56790038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f4e55be6090 RCX: 00007f4e5598efc9 RDX: 0000000000002020 RSI: 00002000000040c0 RDI: 0000000000000004 RBP: 00007f4e55a11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4e55be6128 R14: 00007f4e55be6090 R15: 00007ffd5d16a678 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup