From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.210.69 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793126141; b=MfXaQZc6kD0VWcU31EkyLHoLlZhkzFxaU/Sy48VpP76ApHIa0G2V3C/oYK8I6bY1wN1L h9ME/YV4RnFMuNGxgJwJai72UeFcokg/qYYmxcIQ5EBTC9qAU9aXQ2YjooYoO04VHosTr 3BjJ56iTuSpQ8hVUZDHdMYFAyQ2H0nbUSq45cnS60Bd8Jfw+bj8gHSpCLDXZ/wHLnbOV9 Hfj0oa3ob/LngwXZKSCgsfmFfztffveB4BipQxWAwgNupZkG32n2SJ6voqIoJ07UO0vOJ Qtn8H2YeWixwajxZcWKMg4CMxNIHOX/MZjrRK8BFBe31I71uPdJ+ApZH4GGNKlHkgsw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793126141; h=DMARC-Filter:Received:X-Google-DKIM-Signature:X-Forwarded-Encrypted: X-Gm-Message-State:MIME-Version:X-Received:Date: X-Google-Appengine-App-Id:X-Google-Appengine-App-Id-Alias:Message-ID: Subject:From:To:Content-Type:Content-Transfer-Encoding; bh=icU5FPIfE2ifa6n5IT2LKqpdSdDGJMCO7cWloXgDCKU=; b=l8mgbBEa6Hdh8hYk9Bs0BTlf55jama4mHkUOGwuTrLvMnh3Im7m/EsASWR1lSOJKK4i3 BkRYy/FzNG7IB6NM7+/FR1czd2hd+vDXk6JmJgwgBSUo/a5PBIvOIw+QSB4cQaAu6R+oq bq+JSmm7nLvSju7h8MyUiBRehj45hEYKzCtbAw7d3E3OhIKL+QvtZfJbce02RQZZ9/rBQ 2/JiSbXL6a+12pS6+EhOAe/k15owydLu57V2utZ6ZHbMff/WtEXnwU5BIABM7g09qGuKC GsgsGQ6NIrgREkvdXDbaD9I1i0xyqWVqV+pcqaWbFvkCqNBetdsb9R9bw1fezYJ7wxA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.remote-ip=209.85.210.69 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFDA2606A31D for ; Tue, 27 Oct 2026 18:35:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org AFDA2606A31D 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-ot1-f69.google.com with SMTP id 46e09a7af769-847e2926d94so346000a34.0 for ; Tue, 27 Oct 2026 11:35:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793126139; x=1793730939; h=content-transfer-encoding:content-type:to:from:subject:message-id :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=icU5FPIfE2ifa6n5IT2LKqpdSdDGJMCO7cWloXgDCKU=; b=dPNvoLoi3RfQiYEENvpoZOm45Eh7obG0BdoM2TsbwYkXdpHsjEf/mtKLGho/XsFULH 1PHApoqjBB43kfC4843CVn9xvhsJRs+GITWbhHr1Ekiz6wehqFqL+KD2pXwq99shV2/k CTyBWK19KnsdQ4iSq7U9zcdqJUJ4w6rYrf05VE48PhkgJV0i6t0BW7X1k7u7yoAVXo8I sQoW9F9eFYq5YmdxZGH35yTzdH5zlpye8EGZ1ISy8lWjQegjrTLrwFICcEiRcZezUr2R bj2EaREVwzI6xdTjAUuCpILg92oHjCxEsaoYvbRJ4j+QEZQiyda/ukFwcddWA81BJp4M 52RQ== X-Forwarded-Encrypted: i=1; AKwUvBzG69QMqGUq94ORlN0nZJTVu8orJL4D7Umocxq6dXObCdNUd/lkhCtDymv4szW05hlTnKx5efOYcqdZrRg=@vger.kernel.org X-Gm-Message-State: AFq9FYL0XJTBCROHt1VRSBGFfoIInZ7rgVoYf4qzkM4pZO1z7AXGIcST M1+hnIu/Pd0263Cx9tyuXdeZnpLCfRj8y3gKqWMNETgFIE4tDb8g131M4ohwAc2N3cnNe6Symho C+Rth+k0GcVlktLeXScaMuijpr5kuTaSSK64lLdmrdRthhy3jpRMhTnr8UWA= X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-Received: by 2002:a05:6808:1822:b0:533:be44:82e with SMTP id 5614622812f47-55c0032b4bbmr7072186b6e.40.1793126139700; Tue, 27 Oct 2026 11:35:39 -0700 (PDT) Date: Tue, 27 Oct 2026 11:35:39 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae0eefb.47d0a7c9.33355c.007b.GAE@google.com> Subject: [syzbot] [net?] WARNING in nsim_dev_netdevice_event From: syzbot To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@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 Hello, syzbot found the following issue on: HEAD commit: 21a7f44fd076 Merge tag 'devicetree-for-7.4' of git://git.k.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D13fd8a95580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3Db5f7e4c9e8708c9= c dashboard link: https://syzkaller.appspot.com/bug?extid=3Da104228f8a378b00e= 6ad compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2ef34699400d/disk-= 21a7f44f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bb6890c72238/vmlinux-= 21a7f44f.xz kernel image: https://storage.googleapis.com/syzbot-assets/35cd2b481e0f/bzI= mage-21a7f44f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+a104228f8a378b00e6ad@syzkaller.appspotmail.com =06: left promiscuous mode P=01=06: left promiscuous mode ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic !=3D lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/m= utex.c:625 [inline], CPU#1: kworker/u8:3/50 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x132a/0x15a0 kernel/lo= cking/mutex.c:821, CPU#1: kworker/u8:3/50 Modules linked in: CPU: 1 UID: 0 PID: 50 Comm: kworker/u8:3 Tainted: G L syz= kaller #0 PREEMPT(full)=20 Tainted: [L]=3DSOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo= gle 10/07/2026 Workqueue: netns cleanup_net RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x1331/0x15a0 kernel/locking/mutex.c:821 Code: 23 9d 91 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 46 02 00 00 83 3d 43 35 = 9e 05 00 75 13 48 8d 3d a6 34 a1 05 48 c7 c6 e0 27 2d 8c <67> 48 0f b9 3a 9= 0 e9 1d ee ff ff 90 0f 0b 90 e9 f0 f1 ff ff 90 0f RSP: 0018:ffffc90000ba7040 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888021a8be80 RDX: 0000000000000000 RSI: ffffffff8c2d27e0 RDI: ffffffff91a02350 RBP: ffffc90000ba71c8 R08: ffffffff919d23e3 R09: 1ffffffff233a47c R10: dffffc0000000000 R11: fffffbfff233a47d R12: ffff88807c371500 R13: 0000000000000000 R14: 1ffff92000174e1c R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812373c000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb6d95f62f8 CR3: 00000000361d6000 CR4: 00000000003526f0 Call Trace: nsim_dev_hwstats_event_unregister drivers/net/netdevsim/hwstats.c:174 [inl= ine] nsim_dev_hwstats_event drivers/net/netdevsim/hwstats.c:192 [inline] nsim_dev_netdevice_event+0x1e8/0x830 drivers/net/netdevsim/hwstats.c:207 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 call_netdevice_notifiers_info+0x8c/0x100 net/core/dev.c:2310 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline] call_netdevice_notifiers net/core/dev.c:2365 [inline] unregister_netdevice_many_notify+0x1432/0x1d80 net/core/dev.c:12697 unregister_netdevice_many net/core/dev.c:12768 [inline] unregister_netdevice_queue+0x2f5/0x340 net/core/dev.c:12564 unregister_netdevice include/linux/netdevice.h:3509 [inline] _cfg80211_unregister_wdev+0x1c4/0x8e0 net/wireless/core.c:1503 ieee80211_remove_interfaces+0x49c/0x6a0 net/mac80211/iface.c:2528 ieee80211_unregister_hw+0x5d/0x2d0 net/mac80211/main.c:1725 mac80211_hwsim_del_radio+0x31a/0x500 drivers/net/wireless/virtual/mac80211= _hwsim_main.c:6302 hwsim_exit_net+0xe91/0xf50 drivers/net/wireless/virtual/mac80211_hwsim_mai= n.c:7365 ops_exit_list net/core/net_namespace.c:200 [inline] ops_undo_list+0x451/0x8f0 net/core/net_namespace.c:253 cleanup_net+0x572/0x810 net/core/net_namespace.c:706 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 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 ---------------- Code disassembly (best guess): 0: 23 9d 91 48 c1 e8 and -0x173eb76f(%rbp),%ebx 6: 03 0f add (%rdi),%ecx 8: b6 04 mov $0x4,%dh a: 18 84 c0 0f 85 46 02 sbb %al,0x246850f(%rax,%rax,8) 11: 00 00 add %al,(%rax) 13: 83 3d 43 35 9e 05 00 cmpl $0x0,0x59e3543(%rip) # 0x59e355d 1a: 75 13 jne 0x2f 1c: 48 8d 3d a6 34 a1 05 lea 0x5a134a6(%rip),%rdi # 0x5a134c9 23: 48 c7 c6 e0 27 2d 8c mov $0xffffffff8c2d27e0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 1d ee ff ff jmp 0xffffee52 35: 90 nop 36: 0f 0b ud2 38: 90 nop 39: e9 f0 f1 ff ff jmp 0xfffff22e 3e: 90 nop 3f: 0f .byte 0xf --- 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 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