From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (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 6C49436DA0B for ; Mon, 22 Jun 2026 07:42:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782114146; cv=none; b=WtSSR57bTLkRlqwMMV5DyuMnRW0qGMimlM0Vbty+2BoWIh93WnhRYYhCWv2u2e7SwwfZjHz8gnKmWzCdyRsfaaQ0t9GVULemyAkvVBkkIaP7kRHi8ze2oOO6wT+EpeNL0aIOqJ3lWrIJIA6EKLcHEGAkDosugcsw7vi2QxeNUdM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782114146; c=relaxed/simple; bh=wvheAgQKuEuK+AbYeCFSNsXqSoV2Afp50MQUpMq0XLk=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=X7shEcr8uPaDZo5+QYO7+1r9vw34BO07zoIp4n+Wk1Ab7BsuEnBdzDeD1hAgxtuX204CYvhhj0dTxHRh35ZOoqgKyXLwhX7wdJpZGhXx/Adsp5sGINfpaDptbDsol6cI5orzLWlDQRr4WR/3sDNdNOmUN95X4kjNW7Q58TaOqkw= 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=209.85.167.206 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-oi1-f206.google.com with SMTP id 5614622812f47-486cc29e03bso8160817b6e.3 for ; Mon, 22 Jun 2026 00:42:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782114143; x=1782718943; h=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=IQUNL7abn7FyBCVxw0XQrU4Z9rZYYYwgqGA3doOw68k=; b=joCIJYWPcvLsFAJWR/caUbcEqkcSRmDvuioBja3CrJiojHowjvB/R1tXX7789c8vdz trGtua8H02wVI1g1iXurB7eLeYAZCVQitowmzWp7aoR+2jHeOfU6SvfvnxdEVfDGqzJ4 eRQmGNbHNi7VpVKJDDx5IdKrYd0T2VQVyplQVYGMOO/RgXB1kofsN/YPElmmiAp8OSi7 Y1j9oTRcOV4BrIJjUibRDOOA8BvLjYKLjHHZTBUylLUPz77a24VNUg+o6fPcA62FJvfJ OC3+yk2S9aimfnuYzziCqJS7i1bAudfUoMjxBLb34oKTssdyNTRpWlAYeZJKevPwKVM5 Wyww== X-Forwarded-Encrypted: i=1; AFNElJ9cY8dRI06jz2eaNHuQX28260VvKh42Qn7Sp5EgsQSM6tNHpocdlud05U1UpGjHvQDVHSsDm628Jr/AhAg=@vger.kernel.org X-Gm-Message-State: AOJu0YzbHqU9xfN5P9sxiE0nCQLi48GwelxCn+vuokRBu9oOufnYArIB q+ZfdmdozPs0hQHFu35ZNhD9Wmgy4lnKbo5778G2V9ZPZvibnaqSoYPDqI0YwU/1yw38f0A/qdM 7B5brlQSjXaKDavd3M6U5QAIFKDgjMqgrTJXbhrV62Sh9FTmVJNunHTQJWUc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:191b:b0:485:5982:4cfc with SMTP id 5614622812f47-4896ac94f70mr11176492b6e.33.1782114143419; Mon, 22 Jun 2026 00:42:23 -0700 (PDT) Date: Mon, 22 Jun 2026 00:42:23 -0700 In-Reply-To: <000000000000f9be320619be1c0a@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a38e75f.713c5d62.148f7.000d.GAE@google.com> Subject: Re: [syzbot] [net?] INFO: task hung in nsim_destroy (4) From: syzbot To: andrew+netdev@lunn.ch, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, 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" syzbot has found a reproducer for the following issue on: HEAD commit: b85966adbf5d Merge tag 'net-next-7.2' of git://git.kernel... git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=11f167b6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a9f723a32776544 dashboard link: https://syzkaller.appspot.com/bug?extid=8141dcbd23a8f857798a compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15cf400a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1013a50e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d65306d96573/disk-b85966ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ef43139aab0e/vmlinux-b85966ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/26d4d1ab67c3/bzImage-b85966ad.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8141dcbd23a8f857798a@syzkaller.appspotmail.com INFO: task kworker/R-netns:8 blocked for more than 140 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/R-netns state:D stack:27768 pid:8 tgid:8 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 __schedule_loop kernel/sched/core.c:7307 [inline] schedule+0x164/0x360 kernel/sched/core.c:7322 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] rtnl_net_dev_lock+0x257/0x2f0 net/core/dev.c:2163 unregister_netdevice_notifier_dev_net+0x96/0x450 net/core/dev.c:2208 nsim_destroy+0xfd/0x800 drivers/net/netdevsim/netdev.c:1183 __nsim_dev_port_del+0x14e/0x200 drivers/net/netdevsim/dev.c:1547 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1785 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x1c5/0x890 net/devlink/dev.c:462 devlink_pernet_pre_exit+0x1ff/0x420 net/devlink/core.c:560 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x17d/0x8d0 net/core/net_namespace.c:234 cleanup_net+0x572/0x810 net/core/net_namespace.c:702 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 rescuer_thread+0x7b6/0x10b0 kernel/workqueue.c:3621 kthread+0x388/0x470 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 INFO: task kworker/0:1:10 blocked for more than 142 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:27096 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events request_firmware_work_func Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 __schedule_loop kernel/sched/core.c:7307 [inline] schedule+0x164/0x360 kernel/sched/core.c:7322 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821 regdb_fw_cb+0x7d/0x1c0 net/wireless/reg.c:1005 request_firmware_work_func+0xf2/0x1a0 drivers/base/firmware_loader/main.c:1152 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x388/0x470 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 INFO: task kworker/u8:0:12 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:23864 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 __schedule_loop kernel/sched/core.c:7307 [inline] schedule+0x164/0x360 kernel/sched/core.c:7322 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_dad_work+0x116/0x15c0 net/ipv6/addrconf.c:4223 INFO: task syz-executor831:5632 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor831 state:R running task stack:22336 pid:5632 tgid:5632 ppid:5629 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228 INFO: lockdep is turned off. 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 05/09/2026 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+0xfd7/0x1030 kernel/hung_task.c:561 kthread+0x388/0x470 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 808 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker RIP: 0010:memset_orig+0x25/0xb0 arch/x86/lib/memset_64.S:64 Code: 90 90 90 90 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 <74> 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 RSP: 0018:ffffc90000006f20 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000007078 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007078 RBP: 1ffffffff2189698 R08: ffffc90000007087 R09: 0000000000000000 R10: ffffc90000007078 R11: fffff52000000e11 R12: dffffc0000000000 R13: ffffffff90c4b4c0 R14: ffffc90000007028 R15: ffffc90000007070 FS: 0000000000000000(0000) GS:ffff88812527c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055968609b450 CR3: 000000000e746000 CR4: 00000000003526f0 Call Trace: unwind_next_frame+0xd04/0x2550 arch/x86/kernel/unwind_orc.c:621 __unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2700 [inline] slab_free mm/slub.c:6310 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6437 nft_synproxy_eval_v4+0x383/0x530 net/netfilter/nft_synproxy.c:61 nft_synproxy_do_eval+0x335/0x550 net/netfilter/nft_synproxy.c:142 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6206 [inline] __netif_receive_skb net/core/dev.c:6319 [inline] process_backlog+0xa34/0x1860 net/core/dev.c:6670 __napi_poll+0xaa/0x330 net/core/dev.c:7729 napi_poll net/core/dev.c:7792 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7949 handle_softirqs+0x225/0x840 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] ptr_ring_consume_bh include/linux/ptr_ring.h:393 [inline] wg_packet_encrypt_worker+0x16e2/0x1760 drivers/net/wireguard/send.c:293 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478 kthread+0x388/0x470 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 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.314 msecs --- 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.