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Message-ID: <6920caf3.a70a0220.d98e3.004a.GAE@google.com> Date: Fri, 21 Nov 2025 12:26:27 -0800 From: syzbot <syzbot+9b98dcd91414ddae4a56@...kaller.appspotmail.com> To: johannes@...solutions.net, linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [wireless?] WARNING in ieee80211_teardown_sdata (2) Hello, syzbot found the following issue on: HEAD commit: 6a23ae0a96a6 Linux 6.18-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=104e6692580000 kernel config: https://syzkaller.appspot.com/x/.config?x=14b6a9313e132a6b dashboard link: https://syzkaller.appspot.com/bug?extid=9b98dcd91414ddae4a56 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/464c2673a9ca/disk-6a23ae0a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c2986bef024f/vmlinux-6a23ae0a.xz kernel image: https://storage.googleapis.com/syzbot-assets/4077bdc25422/bzImage-6a23ae0a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b98dcd91414ddae4a56@...kaller.appspotmail.com bond0: (slave wlan1): Releasing backup interface ------------[ cut here ]------------ WARNING: CPU: 0 PID: 10842 at net/mac80211/iface.c:861 ieee80211_teardown_sdata+0xd2/0x140 net/mac80211/iface.c:861 Modules linked in: CPU: 0 UID: 0 PID: 10842 Comm: syz.0.1271 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:ieee80211_teardown_sdata+0xd2/0x140 net/mac80211/iface.c:861 Code: f7 48 89 df 31 f6 31 d2 e8 0b 9b 00 00 48 81 c3 10 18 00 00 48 89 df 5b 41 5c 41 5e 41 5f 5d e9 94 bb 00 00 e8 3f a5 03 f7 90 <0f> 0b 90 4c 8d bb 30 0a 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 RSP: 0018:ffffc9001b87f050 EFLAGS: 00010287 RAX: ffffffff8abc5ed1 RBX: ffff888059190d80 RCX: 0000000000080000 RDX: ffffc9000b8c2000 RSI: 000000000001e9e7 RDI: 000000000001e9e8 RBP: ffffc9001b87f1f0 R08: ffffffff8f7ceb77 R09: 1ffffffff1ef9d6e R10: dffffc0000000000 R11: ffffffff8abcbe10 R12: dffffc0000000000 R13: ffff888059190c18 R14: ffff888059191a08 R15: ffff888059190000 FS: 0000000000000000(0000) GS:ffff88812613b000(0063) knlGS:00000000f53f6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000008057f000 CR3: 00000000591a8000 CR4: 00000000003526f0 Call Trace: <TASK> unregister_netdevice_many_notify+0x1cde/0x2390 net/core/dev.c:12305 unregister_netdevice_many net/core/dev.c:12347 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12161 unregister_netdevice include/linux/netdevice.h:3389 [inline] _cfg80211_unregister_wdev+0x165/0x590 net/wireless/core.c:1284 ieee80211_if_remove+0x256/0x310 net/mac80211/iface.c:2334 ieee80211_del_iface+0x19/0x30 net/mac80211/cfg.c:237 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x231/0x3f0 net/wireless/util.c:2928 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg+0x164/0x220 net/socket.c:2716 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f02539 Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f53f655c EFLAGS: 00000206 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000080000200 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess): 0: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 4: 10 07 adc %al,(%rdi) 6: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi a: 10 08 adc %cl,(%rax) c: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop --- 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@...glegroups.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
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