WARNING in __rate_control_send_low

Hello,

syzbot found the following issue on:

HEAD commit:    bbf5c979 Linux 5.9
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12dc474f900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3d8333c88fe898d7
dashboard link: https://syzkaller.appspot.com/bug?extid=fdc5123366fb9c3fdc6d
compiler:       gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: <redacted>

------------[ cut here ]------------
no supported rates for sta (null) (0xffffffff, band 0) in rate_mask 0xfff with flags 0x20
WARNING: CPU: 1 PID: 169 at net/mac80211/rate.c:349 __rate_control_send_low+0x4eb/0x5e0 net/mac80211/rate.c:349
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 169 Comm: kworker/u4:5 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy9 ieee80211_scan_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:__rate_control_send_low+0x4eb/0x5e0 net/mac80211/rate.c:349
Code: 14 48 89 44 24 08 e8 d4 8d b0 f9 44 8b 44 24 24 45 89 e9 44 89 e1 48 8b 74 24 08 44 89 f2 48 c7 c7 40 24 5f 89 e8 b7 ca 80 f9 <0f> 0b e9 e0 fd ff ff e8 a9 8d b0 f9 41 83 cd 10 e9 02 fc ff ff e8
RSP: 0018:ffffc900013f7688 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88801e243468 RCX: 0000000000000000
RDX: ffff8880a884e100 RSI: ffffffff815f5a55 RDI: fffff5200027eec3
RBP: ffff88805f373148 R08: 0000000000000001 R09: ffff8880ae5318e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000020 R14: 00000000ffffffff R15: 0000000000000090

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syzbot has found a reproducer for the following issue on:

HEAD commit:    80145ac2 Merge tag 's390-5.10-5' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=130e5a79500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b81aff78c272da44
dashboard link: https://syzkaller.appspot.com/bug?extid=fdc5123366fb9c3fdc6d
compiler:       gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12bf662d500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11671c8b500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: <redacted>

------------[ cut here ]------------
no supported rates for sta (null) (0xffffffff, band 0) in rate_mask 0x0 with flags 0x0
WARNING: CPU: 1 PID: 8503 at net/mac80211/rate.c:375 __rate_control_send_low+0x4d0/0x6d0 net/mac80211/rate.c:375
Modules linked in:
CPU: 1 PID: 8503 Comm: systemd-sysctl Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__rate_control_send_low+0x4d0/0x6d0 net/mac80211/rate.c:375
Code: 14 48 89 44 24 08 e8 7f dd 25 f9 44 8b 44 24 24 45 89 e9 44 89 e1 48 8b 74 24 08 44 89 f2 48 c7 c7 a0 f7 61 8a e8 fc 5b 62 00 <0f> 0b e9 1c fe ff ff e8 54 dd 25 f9 48 8b 44 24 10 48 8d 78 7f 48
RSP: 0018:ffffc90000d90a40 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888026ce8de8 RCX: 0000000000000000
RDX: ffff88801e450000 RSI: ffffffff8158d875 RDI: fffff520001b213a
RBP: ffff888144343148 R08: 0000000000000001 R09: ffff8880b9f30627
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000090
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde93cedab4 CR3: 0000000012e10000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rate_control_send_low+0x265/0x730 net/mac80211/rate.c:400
 rate_control_get_rate+0x1b9/0x5a0 net/mac80211/rate.c:913
 __ieee80211_beacon_get+0xb06/0x1aa0 net/mac80211/tx.c:4924
 ieee80211_beacon_get_tim+0x88/0x910 net/mac80211/tx.c:4951

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