Re: [syzbot] [wireless?] WARNING in mac80211_hwsim_tx (2)

[syzbot <syzbot+435fdb053cf98bfa5778@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    dc59e4fea9d8 Linux 7.2-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12f58032580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c3d59be33cf7e9a
dashboard link: https://syzkaller.appspot.com/bug?extid=435fdb053cf98bfa5778
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13a73289580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=135db61e580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dc59e4fe.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ee1f0ea24f2/vmlinux-dc59e4fe.xz
kernel image: https://storage.googleapis.com/syzbot-assets/729e963a1370/bzImage-dc59e4fe.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+435fdb053cf98bfa5778@syzkaller.appspotmail.com

mac80211_hwsim hwsim5 wlan1: entered allmulticast mode
------------[ cut here ]------------
hwsim_get_chanwidth(bw) > hwsim_get_chanwidth(confbw)
WARNING: drivers/net/wireless/virtual/mac80211_hwsim_main.c:2248 at mac80211_hwsim_tx+0x1ab4/0x2500 drivers/net/wireless/virtual/mac80211_hwsim_main.c:2248, CPU#0: syz.0.17/5510
Modules linked in:
CPU: 0 UID: 0 PID: 5510 Comm: syz.0.17 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_tx+0x1ab4/0x2500 drivers/net/wireless/virtual/mac80211_hwsim_main.c:2248
Code: c6 05 da 65 07 09 01 48 c7 c7 e0 74 7a 8c be 6b 08 00 00 48 c7 c2 20 76 7a 8c e8 a7 d6 8c fa e9 ff ee ff ff e8 7d eb b0 fa 90 <0f> 0b 90 49 bc 00 00 00 00 00 fc ff df e9 dd fe ff ff e8 65 eb b0
RSP: 0018:ffffc9000278efe0 EFLAGS: 00010293
RAX: ffffffff87158693 RBX: 0000000000000000 RCX: ffff888000ad8000
RDX: 0000000000000000 RSI: 0000000000000014 RDI: 00000000000000a0
RBP: ffffc9000278f170 R08: ffff888000ad8000 R09: 000000000000000e
R10: 000000000000000d R11: 0000000000000000 R12: 0000000000000014
R13: ffff8880120b3cb0 R14: 00000000000000a0 R15: 0000000000000030
FS:  000055559073c500(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005562391e0138 CR3: 0000000012ea1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 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:5400 [inline]
 netdev_start_xmit include/linux/netdevice.h:5409 [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+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 __sys_sendto+0x408/0x5a0 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: 0033:0x7fc04219ce59
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:00007ffcb766be38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fc042415fa0 RCX: 00007fc04219ce59
RDX: 0000000000000030 RSI: 0000200000000640 RDI: 0000000000000008
RBP: 00007fc042232e6f R08: 0000200000000380 R09: 0000000000000014
R10: 0000000004000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc042415fac R14: 00007fc042415fa0 R15: 00007fc042415fa0
 </TASK>


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