syzbot

------------[ cut here ]------------
WARNING: CPU: 1 PID: 4574 at net/mac80211/tx.c:4859 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4859 [inline]
WARNING: CPU: 1 PID: 4574 at net/mac80211/tx.c:4859 __ieee80211_beacon_get+0x179f/0x2000 net/mac80211/tx.c:5083
Modules linked in:
CPU: 1 PID: 4574 Comm: syz.3.66 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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 6d 09 2a f8 0f 0b e9 03 ef ff ff e8 61 09 2a f8 <0f> 0b e9 76 f2 ff ff e8 65 ae 6d 00 89 d9 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90000dd08e0 EFLAGS: 00010246
RAX: ffffffff894f2b2f RBX: ffff88805e606268 RCX: ffff888029fa5940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000dd0b08 R08: ffff888029fa5940 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff888076a7a200
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920001ba12c
FS:  00007fa97ff886c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000359030 CR3: 00000000725eb000 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:unix_dgram_recvmsg+0x5f/0xd0 net/unix/af_unix.c:2409
Code: 4c 89 e7 e8 b3 8d 25 f9 4d 8b 24 24 4d 8d 6c 24 28 4c 89 e8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ef e8 95 8d 25 f9 4d 8b 6d 00 <49> 81 fd 20 17 53 8d 74 45 e8 b3 6e e0 f8 49 83 c5 70 4c 89 e8 48
RSP: 0018:ffffc90003e3f8c8 EFLAGS: 00000246
RAX: 1ffff1100fbcb205 RBX: 0000000000000002 RCX: ffff888029fa5940
RDX: 0000000000000000 RSI: ffffc90003e3fd40 RDI: ffff88805846b000
RBP: dffffc0000000000 R08: ffffc90003e3fa1f R09: ffffc90003e3f9a0
R10: dffffc0000000000 R11: fffff520007c7f44 R12: ffff88807de59000
R13: ffffffff8d531720 R14: 0000000000000000 R15: ffffc90003e3fd40
 ____sys_recvmsg+0x2cd/0x5e0 net/socket.c:-1
 ___sys_recvmsg+0x21a/0x5c0 net/socket.c:2706
 do_recvmmsg+0x382/0x850 net/socket.c:2800
 __sys_recvmmsg net/socket.c:2879 [inline]
 __do_sys_recvmmsg net/socket.c:2902 [inline]
 __se_sys_recvmmsg net/socket.c:2895 [inline]
 __x64_sys_recvmmsg+0x195/0x250 net/socket.c:2895
 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: 0033:0x7fa980947dd9
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:00007fa97ff88028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fa980bc1090 RCX: 00007fa980947dd9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fa9809ddd69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa980bc1128 R14: 00007fa980bc1090 R15: 00007fff09d64058
 </TASK>
----------------
Code disassembly (best guess):
   0:	4c 89 e7             	mov    %r12,%rdi
   3:	e8 b3 8d 25 f9       	call   0xf9258dbb
   8:	4d 8b 24 24          	mov    (%r12),%r12
   c:	4d 8d 6c 24 28       	lea    0x28(%r12),%r13
  11:	4c 89 e8             	mov    %r13,%rax
  14:	48 c1 e8 03          	shr    $0x3,%rax
  18:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  1c:	74 08                	je     0x26
  1e:	4c 89 ef             	mov    %r13,%rdi
  21:	e8 95 8d 25 f9       	call   0xf9258dbb
  26:	4d 8b 6d 00          	mov    0x0(%r13),%r13
* 2a:	49 81 fd 20 17 53 8d 	cmp    $0xffffffff8d531720,%r13 <-- trapping instruction
  31:	74 45                	je     0x78
  33:	e8 b3 6e e0 f8       	call   0xf8e06eeb
  38:	49 83 c5 70          	add    $0x70,%r13
  3c:	4c 89 e8             	mov    %r13,%rax
  3f:	48                   	rex.W