[v6.6] WARNING in __rate_control_send_low

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 59a2de10b81a Linux 6.6.97
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13b7dd82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ac0b29aca872266f
dashboard link: https://syzkaller.appspot.com/bug?extid=76cb5fc272f0dc09dd32
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/32864b54a55c/disk-59a2de10.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b0bbe4ada642/vmlinux-59a2de10.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9e3fe91e14c2/bzImage-59a2de10.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+76cb5f...@syzkaller.appspotmail.com

------------[ cut here ]------------
no supported rates for sta (null) (0xffffffff, band 0) in rate_mask 0xfff with flags 0x20
WARNING: CPU: 1 PID: 22 at net/mac80211/rate.c:385 __rate_control_send_low+0x635/0x880 net/mac80211/rate.c:380
Modules linked in:
CPU: 1 PID: 22 Comm: ksoftirqd/1 Not tainted 6.6.97-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__rate_control_send_low+0x635/0x880 net/mac80211/rate.c:380
Code: 30 42 0f b6 04 28 84 c0 0f 85 e6 01 00 00 41 8b 0e 48 c7 c7 c0 87 be 8b 48 8b 74 24 10 44 8b 44 24 1c 45 89 e1 e8 db 6e 69 f7 <0f> 0b e9 78 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 03 fa ff
RSP: 0000:ffffc900001c73c0 EFLAGS: 00010246
RAX: a596fd311a350500 RBX: 000000000000000c RCX: ffff88801c653c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000084 R08: ffffc900001c6fc7 R09: 1ffff92000038df8
R10: dffffc0000000000 R11: fffff52000038df9 R12: 0000000000000020
R13: dffffc0000000000 R14: ffff888051203358 R15: ffff88806c97a3e8
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c815ff8 CR3: 00000000628ea000 CR4: 00000000003526e0
Call Trace:
<TASK>
rate_control_send_low+0x194/0x790 net/mac80211/rate.c:405
rate_control_get_rate+0x20b/0x5c0 net/mac80211/rate.c:921
ieee80211_beacon_get_finish+0x38d/0x6b0 net/mac80211/tx.c:5218
ieee80211_beacon_get_ap+0x1429/0x1970 net/mac80211/tx.c:5321
__ieee80211_beacon_get+0x10eb/0x1600 net/mac80211/tx.c:5417
ieee80211_beacon_get_tim+0xb8/0x560 net/mac80211/tx.c:5559
ieee80211_beacon_get include/net/mac80211.h:5438 [inline]
mac80211_hwsim_beacon_tx+0x3c7/0x780 drivers/net/wireless/virtual/mac80211_hwsim.c:2265
__iterate_interfaces+0x243/0x500 net/mac80211/util.c:766
ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:802
mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295
__run_hrtimer kernel/time/hrtimer.c:1755 [inline]
__hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836
handle_softirqs+0x280/0x820 kernel/softirq.c:578
run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950
smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 59a2de10b81a Linux 6.6.97
git tree: linux-6.6.y

console output: https://syzkaller.appspot.com/x/log.txt?x=10d587d4580000

kernel config: https://syzkaller.appspot.com/x/.config?x=ac0b29aca872266f
dashboard link: https://syzkaller.appspot.com/bug?extid=76cb5fc272f0dc09dd32
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=118c3d82580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c230f0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/32864b54a55c/disk-59a2de10.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b0bbe4ada642/vmlinux-59a2de10.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9e3fe91e14c2/bzImage-59a2de10.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+76cb5f...@syzkaller.appspotmail.com

------------[ cut here ]------------
no supported rates for sta (null) (0xffffffff, band 0) in rate_mask 0xfff with flags 0x20

WARNING: CPU: 0 PID: 16 at net/mac80211/rate.c:385 __rate_control_send_low+0x635/0x880 net/mac80211/rate.c:380
Modules linked in:
CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.6.97-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__rate_control_send_low+0x635/0x880 net/mac80211/rate.c:380
Code: 30 42 0f b6 04 28 84 c0 0f 85 e6 01 00 00 41 8b 0e 48 c7 c7 c0 87 be 8b 48 8b 74 24 10 44 8b 44 24 1c 45 89 e1 e8 db 6e 69 f7 <0f> 0b e9 78 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 03 fa ff

RSP: 0018:ffffc900001573c0 EFLAGS: 00010246
RAX: bdd8f0e0b16dc600 RBX: 000000000000000c RCX: ffff88801be5da00

RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002

RBP: 0000000000000084 R08: ffffc90000156fc7 R09: 1ffff9200002adf8
R10: dffffc0000000000 R11: fffff5200002adf9 R12: 0000000000000020
R13: dffffc0000000000 R14: ffff88802620b358 R15: ffff88807598cb68
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fd06e381ab8 CR3: 000000000cb30000 CR4: 00000000003506f0

Call Trace:
<TASK>
rate_control_send_low+0x194/0x790 net/mac80211/rate.c:405
rate_control_get_rate+0x20b/0x5c0 net/mac80211/rate.c:921
ieee80211_beacon_get_finish+0x38d/0x6b0 net/mac80211/tx.c:5218
ieee80211_beacon_get_ap+0x1429/0x1970 net/mac80211/tx.c:5321
__ieee80211_beacon_get+0x10eb/0x1600 net/mac80211/tx.c:5417
ieee80211_beacon_get_tim+0xb8/0x560 net/mac80211/tx.c:5559
ieee80211_beacon_get include/net/mac80211.h:5438 [inline]
mac80211_hwsim_beacon_tx+0x3c7/0x780 drivers/net/wireless/virtual/mac80211_hwsim.c:2265
__iterate_interfaces+0x243/0x500 net/mac80211/util.c:766
ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:802
mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295
__run_hrtimer kernel/time/hrtimer.c:1755 [inline]
__hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836
handle_softirqs+0x280/0x820 kernel/softirq.c:578
run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950
smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>


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