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 CB374283C90 for ; Thu, 28 Aug 2025 13:39:29 +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=1756388372; cv=none; b=m3dGs/PvWKFGDYJwVhpfQCgqZqlNNOEVESQgJkI6/5e0dpD9n56fM1JUkpAmP8dW/3b7lXnn+5kbeYsZAgkWZDLWSyr4pUov72saqaNu/ghXO0PX9PG1vdgZZlt4rADeLAWJbVt8pZGRzpJcf28/QEO8OrOzb0il2w7EaDeL3z8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756388372; c=relaxed/simple; bh=KLE7zDvup+oVGJY8/LDoBBs05A/xmGHvn1Hx1L1H6Io=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=NNTFEvnEGNeUZHCP5rHqHrVsOKZY5e9RZ/MqqckPoKDOZfD8d7piFS5tb9YTBiLjENATberJK8ezj7suNEiSHbePcb2OrxggiS3UtyhCZRb4TByjMfWXWku+mUiZdSViUNgmnzCI3lV+d/+1nNHi0LCxtLMVD26FOZU0w6+elOk= 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-3ed0ba44c8fso11466685ab.0 for ; Thu, 28 Aug 2025 06:39:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756388369; x=1756993169; h=content-transfer-encoding:to:from:subject:message-id:in-reply-to :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=QektFrnC4mN/79JbyrdXktJYYVT4Tjl+pDvNCMND5L0=; b=Wi9g66BQlmdPG9L/ay/zUhJAaKo0UQLjL+fQh2qmBctrgIsgjAJubTZoOmv1ijLD1o zlzWdasVNqw4NpLVlAA9Sphdn1G1XQ717Gxwzi6lL9Dt7ZvCd0bnncZD03mvm8Ms5X66 0BRzDoa7zV6QrMJGm16USTEBTAZwq20g/2a4wOqGJhUHlhUIL1eDWlhUy/dg3IdLOKRV 9+nr9k1Q3tcnPwGbggl5Uuft1VluzsmGNrS1VMskP+7nN25xacI6IpqUPTbejawvSLwR HVaAP9D/ypVF0T/Da9fMpJ0KYQlBZS3t7oBosHEJUnynBmdklc+pHj/fcyQVFbsH4NKi H3uw== X-Forwarded-Encrypted: i=1; AJvYcCXBNrfUm9TkzH9q1PWAFKks/eswvNRh5eAq4TeHxZPjAVP2f+k4sJon5GZJ5ch7558C6HbcJI6Z2x+SddM=@vger.kernel.org X-Gm-Message-State: AOJu0YxgJ0OpzmCwqIIHCRs4wccR+Jyxo8uJDeDsSprD4OaHlLOvx1Lf vT9giZgPlCbGKZVn3z07QxER1YtCmZEqgn4IKdgW11ntxfiGQhX4aMClbdano8F9wZd0HP8bcau bYuOj+VIkFfIzFHbXmqyWgKMiZ5KO/BDhJqNYuTb/IbJQqVgAuY6Xt628Z0I= X-Google-Smtp-Source: AGHT+IHpRdvvwiC7wzF5awAQ2gyKkapCl7Gn+lDNvDSTxrRGwC3fqd3j8GbPayOeAH9i+5nQeZbVe8xilaqcpzF4GiJHs5OInthy Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2582:b0:3ed:256a:d680 with SMTP id e9e14a558f8ab-3ed256ad943mr201056015ab.13.1756388368974; Thu, 28 Aug 2025 06:39:28 -0700 (PDT) Date: Thu, 28 Aug 2025 06:39:28 -0700 In-Reply-To: <681a176f.050a0220.a19a9.000c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68b05c10.050a0220.3db4df.001c.GAE@google.com> Subject: Re: [syzbot] [net?] INFO: task hung in inet6_rtm_newaddr (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot has found a reproducer for the following issue on: HEAD commit: 07d9df80082b Merge tag 'perf-tools-fixes-for-v6.17-2025-08.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D124be634580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3Da7016efe6aaa498= c dashboard link: https://syzkaller.appspot.com/bug?extid=3D101224300649c3eb8= af4 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-= 1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D1067dc6258000= 0 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D16a33ef0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d90= 0f083ada3/non_bootable_disk-07d9df80.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/64a01edfb5ff/vmlinux-= 07d9df80.xz kernel image: https://storage.googleapis.com/syzbot-assets/78c915400ff9/bzI= mage-07d9df80.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+101224300649c3eb8af4@syzkaller.appspotmail.com INFO: task dhcpcd:5050 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:dhcpcd state:D stack:21352 pid:5050 tgid:5050 ppid:5049 t= ask_flags:0x400140 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] inet6_rtm_newaddr+0x5b7/0xd20 net/ipv6/addrconf.c:5027 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f92a9337407 RSP: 002b:00007ffe9186d4f0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f92a92ad740 RCX: 00007f92a9337407 RDX: 0000000000000000 RSI: 00007ffe918816d0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe91891900 R13: 00007f92a92ad6c8 R14: 0000000000000048 R15: 00007ffe918816d0 INFO: task syz-executor:5514 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:21480 pid:5514 tgid:5514 ppid:1 t= ask_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] inet6_rtm_newaddr+0x5b7/0xd20 net/ipv6/addrconf.c:5027 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5fde590a7c RSP: 002b:00007ffe3bda8b90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f5fdf2e4620 RCX: 00007f5fde590a7c RDX: 0000000000000040 RSI: 00007f5fdf2e4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe3bda8be4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f5fdf2e4670 R15: 0000000000000000 INFO: task syz-executor:5523 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:22280 pid:5523 tgid:5523 ppid:1 t= ask_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] inet6_rtm_newaddr+0x5b7/0xd20 net/ipv6/addrconf.c:5027 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1fe2590a7c RSP: 002b:00007ffecd1e35b0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f1fe32e4620 RCX: 00007f1fe2590a7c RDX: 0000000000000040 RSI: 00007f1fe32e4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffecd1e3604 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f1fe32e4670 R15: 0000000000000000 INFO: task syz-executor:5767 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:25096 pid:5767 tgid:5767 ppid:1 t= ask_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] inet_rtm_newaddr+0x3b0/0x18b0 net/ipv4/devinet.c:979 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa5ffd90a7c RSP: 002b:00007ffd3b9be780 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa600ae4620 RCX: 00007fa5ffd90a7c RDX: 0000000000000028 RSI: 00007fa600ae4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd3b9be7d4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fa600ae4670 R15: 0000000000000000 Showing all locks held in the system: 4 locks held by kworker/0:0/9: 4 locks held by kworker/0:1/10: 3 locks held by kworker/u4:0/12: 1 lock held by khungtaskd/26: #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire inc= lude/linux/rcupdate.h:331 [inline] #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock includ= e/linux/rcupdate.h:841 [inline] #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks= +0x2e/0x180 kernel/locking/lockdep.c:6775 4 locks held by kworker/u4:2/31: 3 locks held by kworker/u4:3/43: 3 locks held by kworker/u4:5/62: 4 locks held by kworker/0:2/796: 3 locks held by kworker/u4:6/1038: 4 locks held by kworker/u4:7/1039: 3 locks held by kworker/u4:8/1069: #0: ffff88803ef28148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: proce= ss_one_work kernel/workqueue.c:3211 [inline] #0: ffff88803ef28148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: proce= ss_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319 #1: ffffc900025ffbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0= :0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc900025ffbc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0= :0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319 #2: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #2: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112= /0x14b0 net/ipv6/addrconf.c:4194 4 locks held by kworker/u4:9/1094: 3 locks held by kworker/u4:11/3039: 1 lock held by klogd/4741: 1 lock held by dhcpcd/5050: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x5b7= /0xd20 net/ipv6/addrconf.c:5027 2 locks held by getty/5143: #0: ffff8880339e50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait= +0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900028262f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_rea= d+0x43e/0x1400 drivers/tty/n_tty.c:2222 4 locks held by syz-executor/5508: #0: ffffffff8f59fff0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/net= link/genetlink.c:1218 #1: ffffffff8f59fe08 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/g= enetlink.c:35 [inline] #1: ffffffff8f59fe08 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlin= k/genetlink.c:60 [inline] #1: ffffffff8f59fe08 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10d/0x79= 0 net/netlink/genetlink.c:1209 #2: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: wiphy_register+0x1b8d/0= x28d0 net/wireless/core.c:1021 #3: ffff888051510768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_const= ructor include/net/cfg80211.h:6212 [inline] #3: ffff888051510768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_= managed_hints+0xaf/0x1c0 net/wireless/reg.c:3209 1 lock held by syz-executor/5511: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/= tun.c:634 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c= 0 drivers/net/tun.c:3433 1 lock held by syz-executor/5514: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x5b7= /0xd20 net/ipv6/addrconf.c:5027 3 locks held by kworker/0:4/5517: 1 lock held by syz-executor/5521: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtne= tlink.c:80 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core= /rtnetlink.c:341 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c= 70 net/core/rtnetlink.c:4056 1 lock held by syz-executor/5523: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x5b7= /0xd20 net/ipv6/addrconf.c:5027 4 locks held by kworker/0:5/5655: #0: ffff88803ee26148 ((wq_completion)wg-kex-wg1#4){+.+.}-{0:0}, at: proces= s_one_work kernel/workqueue.c:3211 [inline] #0: ffff88803ee26148 ((wq_completion)wg-kex-wg1#4){+.+.}-{0:0}, at: proces= s_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319 #1: ffffc9000ce57bc0 ((work_completion)(&({ do { const void *__vpp_verify = =3D (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ = unsigned long __ptr; __ptr =3D (unsigned long) ((__typeof_unqual__(*((worke= r))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker)= )) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)]))))= ; }); })->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 = [inline] #1: ffffc9000ce57bc0 ((work_completion)(&({ do { const void *__vpp_verify = =3D (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ = unsigned long __ptr; __ptr =3D (unsigned long) ((__typeof_unqual__(*((worke= r))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker)= )) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)]))))= ; }); })->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kern= el/workqueue.c:3319 #2: ffff888058c65308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise= _handshake_consume_initiation+0x150/0x900 drivers/net/wireguard/noise.c:598 #3: ffff88803f1f5c60 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshak= e_consume_initiation+0x4de/0x900 drivers/net/wireguard/noise.c:632 2 locks held by kworker/0:6/5665: 4 locks held by kworker/0:7/5698: 4 locks held by kworker/0:8/5727: 4 locks held by kworker/u4:13/5741: 2 locks held by kworker/u4:14/5742: 3 locks held by kworker/u4:15/5743: 3 locks held by kworker/u4:17/5746: 1 lock held by syz.0.28/5754: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/= tun.c:634 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c= 0 drivers/net/tun.c:3433 3 locks held by kworker/0:10/5760: #0: ffff88801a4d4148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, = at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88801a4d4148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, = at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319 #1: ffffc9000d557bc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one= _work kernel/workqueue.c:3212 [inline] #1: ffffc9000d557bc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_sch= eduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319 #2: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x= 95/0xf30 net/wireless/reg.c:2483 1 lock held by syz-executor/5767: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5780: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5783: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5789: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5795: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5800: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5810: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5819: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5822: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5826: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 4 locks held by kworker/u4:20/5832: #0: ffff8880230b0148 ((wq_completion)wg-kex-wg1){+.+.}-{0:0}, at: process_= one_work kernel/workqueue.c:3211 [inline] #0: ffff8880230b0148 ((wq_completion)wg-kex-wg1){+.+.}-{0:0}, at: process_= scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319 #1: ffffc9000d807bc0 ((work_completion)(&peer->transmit_handshake_work)){+= .+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000d807bc0 ((work_completion)(&peer->transmit_handshake_work)){+= .+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:331= 9 #2: ffff88803f125308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise= _handshake_create_initiation+0x10a/0x7e0 drivers/net/wireguard/noise.c:529 #3: ffff88803f1f4890 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshak= e_create_initiation+0x11b/0x7e0 drivers/net/wireguard/noise.c:530 1 lock held by syz-executor/5835: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5838: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5846: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5852: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5857: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5863: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 3 locks held by kworker/u4:21/5864: 1 lock held by syz-executor/5871: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 1 lock held by syz-executor/5875: #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/l= inux/rtnetlink.h:130 [inline] #0: ffffffff8f53a948 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/= 0x18b0 net/ipv4/devinet.c:979 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 26 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16= .3-2~bpo12+1 04/01/2014 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:328 [inline] watchdog+0xf93/0xfe0 kernel/hung_task.c:491 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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.