From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 D250225A2A4 for ; Sun, 10 May 2026 20:18:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778444317; cv=none; b=NiU8jVk6DyAcPRVh8B5ogVI6w5YSieWPDY7w57wwntfzCd4DoocHjZGpi378LAoC6iq4zwtiTc+T0Fplx37IlY+Bd0G4LMEnUZg33URkJ6iBrcoSQtKtHffhhZhQXi0lwsTQLHdS9PET/wxI2b0K+1OIF/kpDuPucZxexlv65b0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778444317; c=relaxed/simple; bh=1VbD9tSoOOiOx7L7/yrlqyIvm1z7oewsM4VYLk9kyM4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=k3hhpATY9CM0zwkbOVY2Z0w5S54niIkIN3+mhKaGBzl4pnz6WwGm4xhFwdqbZlg/MpAQlMdIGR6n+Wbh2cPbNWLdoan3EH1ja2xpZCecOdl19lRrsaHJxgbMJXIR+/8D+alEXUSi3fpgN2nKMWmWE0BEbB1LJGY5+6z8i7xkoPw= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-696133ef271so6524954eaf.2 for ; Sun, 10 May 2026 13:18:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778444315; x=1779049115; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=MsFrkuR5c5pzT52uZjALg+IZX4swjzWnbawhX1WZ8ZA=; b=HLmzrlralhdt3/u6iXlMdFn1ZfTxLqj4++WQN5QCrqQ9a/CC/4r9dwsxVMVGB0I99J UVv8PYYAuMiPaOnmasFfWAZPEC0TQz6b+dAE/L3+llAj4Y+mO9qDULvCxhgzocdNij+Z QEeteI+i34C3pRsbcRRU206kyNRQsJ250hHPzHFnFZL5VE7jm6W2YTjnb/u0DFtSR6/s TljmJfN/VubF1O4hWZD5Ymm4DPwg7c/EJiq5rNYyhvFUbBM3bs8q9krVpjgzZH+oKHML dI6FxtGk+cKR51O3ks5HqdbjOn8iAc5q0TiNxQd6wKoNVlaSY8BtjAfG9EuWu0UWFbwi TFbA== X-Forwarded-Encrypted: i=1; AFNElJ8hiUCrTVbvPYUmbPml2VURKyUMjzs7aiCWMMwaxwNZye516rwlUHnUN13OSjcsx7ZAxM4X7zg=@vger.kernel.org X-Gm-Message-State: AOJu0YzfUseMpWqOwCZh9FPvAciSoZDzGPEPDT5snYvkk8tIIAlHf5/7 aK2xaUKThtxbshUW/P+dj4ooomvlFVy8H2rCqpW2vSTdnvu5fFoM1WtSacGO1F6WRsLHEegKCFv 6TM91FxcatIMO9vIKjuU/HoFwZ9x8qK/pwu31fOegUES5IvMORhPAdhm0jeI= 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:c8f:b0:694:8f3a:3f36 with SMTP id 006d021491bc7-69b36adfb5dmr3605240eaf.27.1778444314878; Sun, 10 May 2026 13:18:34 -0700 (PDT) Date: Sun, 10 May 2026 13:18:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a00e81a.170a0220.1c0296.0218.GAE@google.com> Subject: [syzbot] [net?] unregister_netdevice: waiting for DEV to become free (9) 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" Hello, syzbot found the following issue on: HEAD commit: 5cbb61bf4168 arm64/fpsimd: ptrace: zero target's fpsimd_st.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=142f40ec580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b dashboard link: https://syzkaller.appspot.com/bug?extid=e2af46126e0644cbebdd compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103f3dba580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/04156ec16593/disk-5cbb61bf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6bfa041e2c79/vmlinux-5cbb61bf.xz kernel image: https://storage.googleapis.com/syzbot-assets/a92d82d8a79e/Image-5cbb61bf.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7915d7230a1d/mount_6.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=15005a73980000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e2af46126e0644cbebdd@syzkaller.appspotmail.com unregister_netdevice: waiting for netdevsim1 to become free. Usage count = 2 ref_tracker: netdev@00000000f11a2c54 has 1/1 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 addrconf_f6i_alloc+0x1e4/0x3b4 net/ipv6/route.c:4697 ipv6_add_addr+0x458/0xd70 net/ipv6/addrconf.c:1126 addrconf_add_linklocal+0x1e0/0x378 net/ipv6/addrconf.c:3311 addrconf_addr_gen+0x27c/0x2e0 net/ipv6/addrconf.c:-1 addrconf_init_auto_addrs+0x390/0x764 net/ipv6/addrconf.c:-1 addrconf_notify+0x7a0/0xbe4 net/ipv6/addrconf.c:3752 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 netdevsim netdevsim2 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 --- 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