------------[ cut here ]------------
WARNING: CPU: 1 PID: 7481 at net/mac80211/tx.c:4859 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4859 [inline]
WARNING: CPU: 1 PID: 7481 at net/mac80211/tx.c:4859 __ieee80211_beacon_get+0x179f/0x2000 net/mac80211/tx.c:5083
Modules linked in:
CPU: 1 PID: 7481 Comm: syz.1.826 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4859 [inline]
RIP: 0010:__ieee80211_beacon_get+0x179f/0x2000 net/mac80211/tx.c:5083
Code: 2a f8 0f 0b 4f 89 64 2f 04 4f 89 64 2f 0c 43 c6 44 2f 14 f8 e9 19 fe ff ff e8 0d 4b 2a f8 0f 0b e9 03 ef ff ff e8 01 4b 2a f8 <0f> 0b e9 76 f2 ff ff e8 a5 92 6d 00 89 d9 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90000dd08e0 EFLAGS: 00010246
RAX: ffffffff894ed60f RBX: ffff88807a886268 RCX: ffff88802c54bb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000dd0b08 R08: ffff88802c54bb80 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff8880236d0a00
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920001ba12c
FS:  00007fc22328f6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49569d3d78 CR3: 000000006a37c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ieee80211_beacon_get_tim+0x48/0x840 net/mac80211/tx.c:5202
 ieee80211_beacon_get include/net/mac80211.h:4983 [inline]
 mac80211_hwsim_beacon_tx+0xf4/0x920 drivers/net/wireless/mac80211_hwsim.c:1812
 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0xb3/0x140 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4f2/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x339/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__preempt_count_add kernel/rcu/tree.c:1119 [inline]
RIP: 0010:rcu_is_watching+0x2/0xa0 kernel/rcu/tree.c:1122
Code: 00 48 3b 44 24 70 75 1b 48 8d 65 e8 5b 41 5e 41 5f 5d c3 e8 a0 99 57 08 41 f7 c7 00 02 00 00 75 bd eb bc e8 80 99 57 08 41 57 <41> 56 53 65 ff 05 7c a0 9d 7e e8 7f a9 57 08 89 c3 83 f8 08 73 5c
RSP: 0018:ffffc9000334f6c0 EFLAGS: 00000202
RAX: ffffffff87ead70d RBX: ffff8880795a5140 RCX: ffff88802c54bb80
RDX: 0000000000000002 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000334f770 R08: dffffc0000000000 R09: 1ffffffff203a818
R10: dffffc0000000000 R11: fffffbfff203a819 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88807d51a000
 rcu_read_lock include/linux/rcupdate.h:741 [inline]
 sk_filter_trim_cap+0x167/0x810 net/core/filter.c:146
 sk_filter include/linux/filter.h:935 [inline]
 unix_dgram_sendmsg+0xafc/0x18a0 net/unix/af_unix.c:1840
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
 __sys_sendmmsg+0x2ba/0x500 net/socket.c:2585
 __do_sys_sendmmsg net/socket.c:2614 [inline]
 __se_sys_sendmmsg net/socket.c:2611 [inline]
 __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2611
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc225035799
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:00007fc22328f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc2252aefa0 RCX: 00007fc225035799
RDX: 0000000000000651 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fc2250cbbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc2252af038 R14: 00007fc2252aefa0 R15: 00007ffc757dd8d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 48 3b             	add    %cl,0x3b(%rax)
   3:	44 24 70             	rex.R and $0x70,%al
   6:	75 1b                	jne    0x23
   8:	48 8d 65 e8          	lea    -0x18(%rbp),%rsp
   c:	5b                   	pop    %rbx
   d:	41 5e                	pop    %r14
   f:	41 5f                	pop    %r15
  11:	5d                   	pop    %rbp
  12:	c3                   	ret
  13:	e8 a0 99 57 08       	call   0x85799b8
  18:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  1f:	75 bd                	jne    0xffffffde
  21:	eb bc                	jmp    0xffffffdf
  23:	e8 80 99 57 08       	call   0x85799a8
  28:	41 57                	push   %r15
* 2a:	41 56                	push   %r14 <-- trapping instruction
  2c:	53                   	push   %rbx
  2d:	65 ff 05 7c a0 9d 7e 	incl   %gs:0x7e9da07c(%rip)        # 0x7e9da0b0
  34:	e8 7f a9 57 08       	call   0x857a9b8
  39:	89 c3                	mov    %eax,%ebx
  3b:	83 f8 08             	cmp    $0x8,%eax
  3e:	73 5c                	jae    0x9c