------------[ cut here ]------------
WARNING: CPU: 0 PID: 6989 at net/mac80211/tx.c:4944 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
WARNING: CPU: 0 PID: 6989 at net/mac80211/tx.c:4944 __ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5345
Modules linked in:
CPU: 0 PID: 6989 Comm: syz.0.750 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
RIP: 0010:__ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5345
Code: 24 4c 89 e7 e8 ae 73 0b f8 45 31 f6 4c 8b bc 24 a0 00 00 00 e9 7a fe ff ff e8 c9 dc d2 f7 0f 0b e9 f6 f7 ff ff e8 bd dc d2 f7 <0f> 0b e9 48 fb ff ff e8 b1 dc d2 f7 48 c7 c7 70 c2 fa 8d 4c 89 e6
RSP: 0018:ffffc90000007a10 EFLAGS: 00010246
RAX: ffffffff89af95b3 RBX: ffffffff89af83b6 RCX: ffff8880277d5940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880277d5940 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff8880790ee258
R13: dffffc0000000000 R14: ffff8880790ee790 R15: ffff888076f31824
FS:  00007fb3906ee6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000007b030 CR3: 0000000077663000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ieee80211_beacon_get_tim+0x63/0x4e0 net/mac80211/tx.c:5472
 ieee80211_beacon_get include/net/mac80211.h:5335 [inline]
 mac80211_hwsim_beacon_tx+0x21c/0xae0 drivers/net/wireless/mac80211_hwsim.c:2091
 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:788
 ieee80211_iterate_active_interfaces_atomic+0xd7/0x170 net/mac80211/util.c:824
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x560/0xd70 kernel/time/hrtimer.c:1811
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x80/0x290 mm/kasan/generic.c:189
Code: ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 <41> 80 3b 00 0f 85 86 01 00 00 49 ff c3 48 ff c3 75 ee e9 18 01 00
RSP: 0018:ffffc90003747a20 EFLAGS: 00000286
RAX: ffffffff8410d701 RBX: fffffffffffffffa RCX: ffffffff8410d7a7
RDX: 0000000000000001 RSI: 0000000000000038 RDI: ffffc90003747ae0
RBP: 0000000000000000 R08: ffffc90003747b17 R09: 1ffff920006e8f62
R10: dffffc0000000000 R11: fffff520006e8f5d R12: dffffc0000000001
R13: dffffc0000000000 R14: 1ffff920006e8f5c R15: 0000000000000007
 instrument_copy_from_user_before include/linux/instrumented.h:137 [inline]
 _copy_from_user+0xe7/0x170 lib/usercopy.c:22
 copy_from_user include/linux/uaccess.h:161 [inline]
 copy_msghdr_from_user net/socket.c:2448 [inline]
 recvmsg_copy_msghdr net/socket.c:2703 [inline]
 ___sys_recvmsg+0x172/0x590 net/socket.c:2775
 do_recvmmsg+0x393/0x870 net/socket.c:2873
 __sys_recvmmsg net/socket.c:2952 [inline]
 __do_sys_recvmmsg net/socket.c:2975 [inline]
 __se_sys_recvmmsg net/socket.c:2968 [inline]
 __x64_sys_recvmmsg+0x195/0x250 net/socket.c:2968
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb38f79aeb9
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:00007fb3906ee028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fb38fa16090 RCX: 00007fb38f79aeb9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fb38f808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb38fa16128 R14: 00007fb38fa16090 R15: 00007ffd3f431428
 </TASK>
----------------
Code disassembly (best guess):
   0:	ff 4d 89             	decl   -0x77(%rbp)
   3:	c1 49 c1 e9          	rorl   $0xe9,-0x3f(%rcx)
   7:	03 4b 8d             	add    -0x73(%rbx),%ecx
   a:	1c 21                	sbb    $0x21,%al
   c:	49 89 df             	mov    %rbx,%r15
   f:	4d 29 df             	sub    %r11,%r15
  12:	49 83 ff 10          	cmp    $0x10,%r15
  16:	7f 29                	jg     0x41
  18:	4d 85 ff             	test   %r15,%r15
  1b:	0f 84 38 01 00 00    	je     0x159
  21:	4c 89 cb             	mov    %r9,%rbx
  24:	48 f7 d3             	not    %rbx
  27:	4c 01 f3             	add    %r14,%rbx
* 2a:	41 80 3b 00          	cmpb   $0x0,(%r11) <-- trapping instruction
  2e:	0f 85 86 01 00 00    	jne    0x1ba
  34:	49 ff c3             	inc    %r11
  37:	48 ff c3             	inc    %rbx
  3a:	75 ee                	jne    0x2a
  3c:	e9                   	.byte 0xe9
  3d:	18 01                	sbb    %al,(%rcx)