From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 7EBF94086A for ; Mon, 22 Jun 2026 12:15:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782130526; cv=none; b=YM++aSj3iA+xNuq0sKZFbSsT8ERKwfLmgIAI9KR/NmS60tbZsdGCLR7hoX741B0k4TnIGY5fhA3bQaJLfuIYBrv8KmvvgEGhFk2s4XKyQMFOvDiN5WGohUSVUMEEn558vYpP1TFcNHkF2/kFv43/7nVq8f5V+MozgAZyXpeb9zM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782130526; c=relaxed/simple; bh=WKpGS9JSJbK0ZzMQsOn+ipFHr1d2DVPDrp1OyoJaLwY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=C3an4KfJ+Xq7wkHs18K3BpxwBQ2u508ouFtExB0FR9FmcMeiMz0vIz7SMiNSqVdByNhbrbWF2hMduRCm8zxlv5Qik3UoEPcH1o5arGpeZJst8d3Hnyn5eb9aPldI3v1zjm5LnFjLQM6UDKfRjSrMZbHZD602MmCS/owp8Is6ylw= 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=209.85.167.208 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-f208.google.com with SMTP id 5614622812f47-48b60638021so4340844b6e.1 for ; Mon, 22 Jun 2026 05:15:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782130524; x=1782735324; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=oNgP9SBR5rvPWzeZce32iGMVrc3C61O1viJd6KKeyOs=; b=Ubd1MeiV/OphS7W1AYNpYMoUcJ+YmeWELSl8DGtJmKj9AnAha2s9C4+wBIhm3s7PvT Ke0414oaQ9E+bnJHwQuUwp++57p41Sx9rvlA8VadBKBpjDNqspspzN2wNZW4UP20Q4aE NFa1jMu5mOY1M3LcDA+Lb7H2x/QXjuWF8oLoCTfwWyKG0WgGAjYEnUqEF8rbXbYtU/Yo SrSFvLSRNbRjpl9nMYd+JQLh8M7dzK6ZnGYBJS1XZ5rM9eOCIA0LDIepju8S1EQx6yB/ R0bAiwLZaCSmnkGJBp3j7CdQvIeSaTJwkAZTanoluB4377l7/sZOsMNHAJjvv1UGYlBg ROrA== X-Forwarded-Encrypted: i=1; AFNElJ/YUwCj7ONTSZ1uDCHiz0XkcXrqhTayl6DNzGCANjPshBf+qWkvLGh9yh1CasRKtFRxKWP3QWT1hSgLyU266w==@vger.kernel.org X-Gm-Message-State: AOJu0Yxy4u8pgLqWY4mdHrUvyN0UtKmeVTf5F/FveGEGYk7Y4FhzgQwn j7hhGKZDIRthGgen30qJUiBQ/u3fuWTPDCKLwLxjUMQ7FYcN9DL12sVmPiy6UZQ63q4327ktNQi MZMVwZMpLwWDejCLdx3Rwg/I5mHy2x7E8N2U7dngYjb1o+kk/NVYd9eyzqT8= Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:bd3:b0:487:4d3f:7364 with SMTP id 5614622812f47-4896a79e01dmr12059027b6e.0.1782130523702; Mon, 22 Jun 2026 05:15:23 -0700 (PDT) Date: Mon, 22 Jun 2026 05:15:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a39275b.5031c61f.34f2da.0002.GAE@google.com> Subject: [syzbot] [wireless?] divide error in mac80211_hwsim_write_tsf From: syzbot To: johannes@sipsolutions.net, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 83f1454877cc Merge tag 'ext4_for_linus-7.2-rc1' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17956aae580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8deb4438448ed47a dashboard link: https://syzkaller.appspot.com/bug?extid=21629c14aa749636db9d compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-83f14548.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/06b66919e887/vmlinux-83f14548.xz kernel image: https://storage.googleapis.com/syzbot-assets/3dedd791b7cd/bzImage-83f14548.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+21629c14aa749636db9d@syzkaller.appspotmail.com Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mac80211_hwsim_write_tsf+0x3a3/0x590 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1628 Code: 81 c4 e8 49 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 1b bb 22 fb 48 8b 34 24 41 03 34 24 66 b8 20 03 31 d2 <66> f7 f5 0f b7 d8 4d 8d 65 0a 49 83 c5 0d 4c 89 e0 48 c1 e8 03 42 RSP: 0018:ffffc900037aedf0 EFLAGS: 00010246 RAX: 1ffff110080a0320 RBX: 000000000000001c RCX: 0000000000100000 RDX: 0000000000000000 RSI: 0000000005e6b00c RDI: 0000000000000230 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006f5dac R12: ffff888040547c08 R13: ffff88803d7fadda R14: dffffc0000000000 R15: 0000000000000020 FS: 00007f2f6aff66c0(0000) GS:ffff88808c852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002280 CR3: 0000000013282000 CR4: 0000000000352ef0 Call Trace: mac80211_hwsim_tx_frame_no_nl+0x16b/0x1760 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1902 mac80211_hwsim_tx+0x1784/0x2500 drivers/net/wireless/virtual/mac80211_hwsim_main.c:2261 drv_tx net/mac80211/driver-ops.h:38 [inline] ieee80211_tx_frags+0x3df/0x890 net/mac80211/tx.c:1746 __ieee80211_tx+0x267/0x580 net/mac80211/tx.c:1801 ieee80211_tx+0x312/0x4b0 net/mac80211/tx.c:1984 ieee80211_monitor_start_xmit+0xb33/0x1280 net/mac80211/tx.c:2479 __netdev_start_xmit include/linux/netdevice.h:5387 [inline] netdev_start_xmit include/linux/netdevice.h:5396 [inline] xmit_one net/core/dev.c:3889 [inline] dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905 __dev_queue_xmit+0x1435/0x37f0 net/core/dev.c:4872 packet_snd net/packet/af_packet.c:3082 [inline] packet_sendmsg+0x3d95/0x5040 net/packet/af_packet.c:3114 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] __sys_sendto+0x626/0x6c0 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2255 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2f6a19ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2f6aff5fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f2f6a415fa0 RCX: 00007f2f6a19ce59 RDX: 0000000000000026 RSI: 0000200000000640 RDI: 0000000000000007 RBP: 00007f2f6a232e6f R08: 0000200000000380 R09: 0000000000000014 R10: 0000000004000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2f6a416038 R14: 00007f2f6a415fa0 R15: 00007ffff9cddab8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mac80211_hwsim_write_tsf+0x3a3/0x590 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1628 Code: 81 c4 e8 49 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 1b bb 22 fb 48 8b 34 24 41 03 34 24 66 b8 20 03 31 d2 <66> f7 f5 0f b7 d8 4d 8d 65 0a 49 83 c5 0d 4c 89 e0 48 c1 e8 03 42 RSP: 0018:ffffc900037aedf0 EFLAGS: 00010246 RAX: 1ffff110080a0320 RBX: 000000000000001c RCX: 0000000000100000 RDX: 0000000000000000 RSI: 0000000005e6b00c RDI: 0000000000000230 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006f5dac R12: ffff888040547c08 R13: ffff88803d7fadda R14: dffffc0000000000 R15: 0000000000000020 FS: 00007f2f6aff66c0(0000) GS:ffff88808c852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002280 CR3: 0000000013282000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 81 c4 e8 49 00 00 add $0x49e8,%esp 6: 4c 89 e0 mov %r12,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 12: 74 08 je 0x1c 14: 4c 89 e7 mov %r12,%rdi 17: e8 1b bb 22 fb call 0xfb22bb37 1c: 48 8b 34 24 mov (%rsp),%rsi 20: 41 03 34 24 add (%r12),%esi 24: 66 b8 20 03 mov $0x320,%ax 28: 31 d2 xor %edx,%edx * 2a: 66 f7 f5 div %bp <-- trapping instruction 2d: 0f b7 d8 movzwl %ax,%ebx 30: 4d 8d 65 0a lea 0xa(%r13),%r12 34: 49 83 c5 0d add $0xd,%r13 38: 4c 89 e0 mov %r12,%rax 3b: 48 c1 e8 03 shr $0x3,%rax 3f: 42 rex.X --- 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