syzbot
WARNING in nl80211_set_tx_bitrate_mask
Status:
upstream: reported on 2026/07/24 21:56
Subsystems:
wireless
Labels:
prio:low
[Documentation on labels]
Reported-by: syzbot+dcaca020ca8377e7ced0@syzkaller.appspotmail.com
First crash: 11d, last: 4d06h
Sample crash report:
------------[ cut here ]------------
wlan0: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.h:884 at drv_set_bitrate_mask net/mac80211/driver-ops.h:884 [inline], CPU#1: syz.3.2120/12933
WARNING: net/mac80211/driver-ops.h:884 at ieee80211_set_bitrate_mask+0x1034/0x1320 net/mac80211/cfg.c:4134, CPU#1: syz.3.2120/12933
Modules linked in:
CPU: 1 UID: 0 PID: 12933 Comm: syz.3.2120 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:drv_set_bitrate_mask net/mac80211/driver-ops.h:884 [inline]
RIP: 0010:ieee80211_set_bitrate_mask+0x1084/0x1320 net/mac80211/cfg.c:4134
Code: 20 01 00 00 48 85 c0 49 0f 44 ee 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 0f 85 3b 01 00 00 41 8b 17 4c 89 ef 48 89 ee <67> 48 0f b9 3a e9 c3 fd ff ff e8 0d 15 82 f6 90 0f 0b 90 e9 41 fe
RSP: 0018:ffffc90006356ff8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1100f4acb25 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff88807a564120 RDI: ffffffff9069c2c0
RBP: ffff88807a564120 R08: ffff88806b050faf R09: 1ffff1100d60a1f5
R10: dffffc0000000000 R11: ffffed100d60a1f6 R12: ffff88806b050740
R13: ffffffff9069c2c0 R14: ffff88807a565938 R15: ffff88807a565928
FS: 00007fd8ec5e56c0(0000) GS:ffff888125050000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c337921 CR3: 000000005ab48000 CR4: 00000000003526f0
Call Trace:
<TASK>
rdev_set_bitrate_mask net/wireless/rdev-ops.h:683 [inline]
nl80211_set_tx_bitrate_mask+0x30b/0x4f0 net/wireless/nl80211.c:14541
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
__sock_sendmsg net/socket.c:790 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2684
___sys_sendmsg+0x2a5/0x360 net/socket.c:2738
__sys_sendmsg net/socket.c:2770 [inline]
__do_sys_sendmsg net/socket.c:2775 [inline]
__se_sys_sendmsg net/socket.c:2773 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773
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: 0033:0x7fd8eb79de99
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:00007fd8ec5e5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd8eba26180 RCX: 00007fd8eb79de99
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 000000000000000b
RBP: 00007fd8eb833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8eba26218 R14: 00007fd8eba26180 R15: 00007ffea66628b8
</TASK>
----------------
Code disassembly (best guess):
0: 20 01 and %al,(%rcx)
2: 00 00 add %al,(%rax)
4: 48 85 c0 test %rax,%rax
7: 49 0f 44 ee cmove %r14,%rbp
b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
12: fc ff df
15: 0f b6 04 03 movzbl (%rbx,%rax,1),%eax
19: 84 c0 test %al,%al
1b: 0f 85 3b 01 00 00 jne 0x15c
21: 41 8b 17 mov (%r15),%edx
24: 4c 89 ef mov %r13,%rdi
27: 48 89 ee mov %rbp,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 c3 fd ff ff jmp 0xfffffdf7
34: e8 0d 15 82 f6 call 0xf6821546
39: 90 nop
3a: 0f 0b ud2
3c: 90 nop
3d: e9 .byte 0xe9
3e: 41 rex.B
3f: fe .byte 0xfe
* Struck through repros no longer work on HEAD.