From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (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 A524740FD80 for ; Mon, 18 May 2026 13:34:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779111269; cv=none; b=jd+q4N4NwbiRZbAs+t7cAVAgCXWMHJCyRUVIGxQLwgik13lkyeFwKWqWDqIOUf2ezRsS5NEDJiiUzf8TZ4M7EXTm8Dn4kuQWzoXNOIa7YvR19AYfsercJ2c8LMBuvBAV2CBgT1reEyWKMd8CXkraxD+uxjWodY/IbgOdf5KBlN8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779111269; c=relaxed/simple; bh=Pn2mFhL6CaBTMy3GCk0GmhF0mTYoLWDtdZGpW5U6iXA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=hytyHfpBYG4E5Ks9iApQgTdBAM184QUZVxMBKErNJTjajUa64TkaqkBce5Yh0axUCMIGaY7I0Kp8/ydgOs7pNF+pbgI2/LVOHjRSLo1vBFuE8H1hRbPhgTQAuah0UyBqbK3mGmgNl7OwKZ2fjciCYvsLPtnHo3S/UuBMAPJI/GE= 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=209.85.160.78 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-oa1-f78.google.com with SMTP id 586e51a60fabf-4398773e510so2145610fac.3 for ; Mon, 18 May 2026 06:34:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779111266; x=1779716066; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=qJ8tWaye7oXuGI3Og5Cutpuk+MQQBLH3Fypi3gFwBF8=; b=cFaC1q6O+l+TkYOx8gS0LUuHNP5efnZ/tVXaiSt1BcY6L2IgsdBzN7qbHO8PYu73CP QKr/3numnvFu5mIafi2CAE4cCLgtDXo6EDnjznuxHPspNjV0Rfn69KB2jgHee6DuhQ8A torxI1Ryxe6LW2w5F7644vqfDfdjyRjRsNkw1t/4ucJWzLmSdJby0ZXzuVIV5OVXIV1w oGTTORuMIx0olb6SoJCabsCEei0MUHhV+gOYipsBZtwLxcMuyv6qwhvvrtqDvEKkjvX1 n0SqXhRG15+uDY2ZjjSeBpVueoFUBbb+3Oj5+5PJLaJHd58ZOk7Oifm/SOFx/EbtnaH3 Yw6w== X-Forwarded-Encrypted: i=1; AFNElJ9HOTxIRCubKKrZUZEHCcvEwo19R63VWPDuM2VsJeO0Q0Nah2QTF5zZhmyx0bMYr2As6Yyfubw=@vger.kernel.org X-Gm-Message-State: AOJu0YxSzrNiI7TbYc7ls5XaDGHNDZEirsT5GnfxyPW2ILTjeML96FYC GxqB0I2ylUG0z5HCZcCrRRCJefCsXJIKVxJep+ltpIEA7KYpD5O0mfUqv6UQV4+ACTnqmyecZa0 ZYuWP0gdzyzbv+X5e973xENstvwmoh8LSbxfgpuiTdys2pvulrQwP6X8Q4H0= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:3103:b0:696:6440:9e2a with SMTP id 006d021491bc7-69c9437a8fdmr8773023eaf.29.1779111266594; Mon, 18 May 2026 06:34:26 -0700 (PDT) Date: Mon, 18 May 2026 06:34:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0b1562.050a0220.67a24.012e.GAE@google.com> Subject: [syzbot] [net?] INFO: task hung in svc_listen (2) From: syzbot To: 3chas3@gmail.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: aaec7096f996 net: hsr: defer node table free until after R.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=10fe2536580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4caf64b1ee83dac0 dashboard link: https://syzkaller.appspot.com/bug?extid=3febffd6d2ea432770c6 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=10bdd02e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a5e02e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2e91c83cade4/disk-aaec7096.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8ec0ff6fa021/vmlinux-aaec7096.xz kernel image: https://storage.googleapis.com/syzbot-assets/b593c2df20a5/bzImage-aaec7096.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3febffd6d2ea432770c6@syzkaller.appspotmail.com INFO: task syz.4.342:7421 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.342 state:D stack:27032 pid:7421 tgid:7420 ppid:5800 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1821/0x5740 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x164/0x360 kernel/sched/core.c:7283 svc_listen+0x2c3/0x500 net/atm/svc.c:311 __sys_listen_socket net/socket.c:1987 [inline] __sys_listen net/socket.c:2002 [inline] __do_sys_listen net/socket.c:2007 [inline] __se_sys_listen net/socket.c:2005 [inline] __x64_sys_listen+0x1c7/0x240 net/socket.c:2005 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa947d9ce59 RSP: 002b:00007fa948b90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000032 RAX: ffffffffffffffda RBX: 00007fa948015fa0 RCX: 00007fa947d9ce59 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000004 RBP: 00007fa947e32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa948016038 R14: 00007fa948015fa0 R15: 00007ffdf1c6c548 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 6 locks held by kworker/u8:3/48: 5 locks held by kworker/u8:7/153: #0: ffff8880b873aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652 #1: ffff8880b8724588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffff8880b8726118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x8ee/0xf30 kernel/time/timer.c:1117 #3: ffffffff9a6b8cf0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580 lib/debugobjects.c:835 #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline] #4: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495 8 locks held by kworker/u8:9/3273: 2 locks held by getty/5386: #0: ffff888032a2e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 1 lock held by syz.4.342/7421: #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880349b6260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.1.414/7744: #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880222c7260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.3.611/8709: #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88807cccf260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.6.637/8830: #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88801bbae260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.0.742/9319: #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff88802a79a260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 1 lock held by syz.9.990/10528: #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #0: ffff8880352ba260 (sk_lock-AF_ATMSVC){+.+.}-{0:0}, at: svc_listen+0x13f/0x500 net/atm/svc.c:295 2 locks held by syz.2.1305/11970: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.7.1304/11974: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.8.1307/11978: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x940 net/core/net_namespace.c:248 2 locks held by syz.5.1308/11983: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d7/0x840 net/ipv4/ip_tunnel.c:1146 2 locks held by syz.4.1309/11988: #0: ffffffff8fdc1568 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:575 #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #1: ffffffff8fdd0240 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x1a/0xa0 net/core/dev.c:2102 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 9b 7d 02 e9 93 f7 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 91 20 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc90000197e20 EFLAGS: 00000246 RAX: 00000000001162af RBX: ffffffff819a958a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8dfa6c27 RDI: ffffffff8c28af60 RBP: ffffc90000197f10 R08: ffff8880b87339db R09: 1ffff110170e673b R10: dffffc0000000000 R11: ffffed10170e673c R12: 0000000000000001 R13: 1ffff11003b5b000 R14: 0000000000000001 R15: 1ffff11003b5b000 FS: 0000000000000000(0000) GS:ffff88812538a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34a24224 CR3: 0000000078488000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x147 --- 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