From: syzbot <syzbot+21629c14aa749636db9d@syzkaller.appspotmail.com>
To: johannes@sipsolutions.net, linux-kernel@vger.kernel.org,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] [wireless?] divide error in mac80211_hwsim_write_tsf
Date: Mon, 22 Jun 2026 05:15:23 -0700 [thread overview]
Message-ID: <6a39275b.5031c61f.34f2da.0002.GAE@google.com> (raw)
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:
<TASK>
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
</TASK>
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
---
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reply other threads:[~2026-06-22 12:15 UTC|newest]
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