syzbot

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WARNING: CPU: 0 PID: 4536 at net/mac80211/tx.c:4851 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4851 [inline]
WARNING: CPU: 0 PID: 4536 at net/mac80211/tx.c:4851 __ieee80211_beacon_get+0x172c/0x1f80 net/mac80211/tx.c:5075
Modules linked in:
CPU: 0 PID: 4536 Comm: syz.0.16 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4851 [inline]
RIP: 0010:__ieee80211_beacon_get+0x172c/0x1f80 net/mac80211/tx.c:5075
Code: f8 0f 0b e9 f1 fa ff ff e8 71 f6 41 f8 0f 0b 4c 8b 74 24 08 e9 36 fe ff ff e8 60 f6 41 f8 0f 0b e9 3c ef ff ff e8 54 f6 41 f8 <0f> 0b e9 b8 f2 ff ff e8 88 d0 6b 00 44 89 e1 80 e1 07 80 c1 03 38
RSP: 0018:ffffc900000078c0 EFLAGS: 00010246
RAX: ffffffff8935ccbc RBX: ffff88805b2c4c80 RCX: ffff888020059dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007ae8 R08: ffff888020059dc0 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff888028d45000
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000000f28
FS:  00007fef5b4086c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000403030 CR3: 00000000237e9000 CR4: 00000000003506f0
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:5194
 ieee80211_beacon_get include/net/mac80211.h:4981 [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:1690 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1771
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 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:lockdep_enabled kernel/locking/lockdep.c:91 [inline]
RIP: 0010:lock_acquire+0x11f/0x3f0 kernel/locking/lockdep.c:5599
Code: 84 ef 00 00 00 65 8b 05 7f 92 a6 7e 85 c0 0f 85 2d 01 00 00 65 4c 8b 35 2f 89 a6 7e 49 81 c6 ec 0a 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 f2 01 00 00 41 83 3e 00 0f 85 00 01 00
RSP: 0018:ffffc900055c7480 EFLAGS: 00000a03
RAX: 1ffff1100400b515 RBX: 0000000000000000 RCX: 07ccd423d362fa00
RDX: 0000000000000000 RSI: ffffffff8a59a8e0 RDI: ffffffff8a59a8a0
RBP: ffffc900055c7588 R08: dffffc0000000000 R09: fffffbfff1ad1586
R10: fffffbfff1ad1586 R11: 1ffffffff1ad1585 R12: ffff88807ed60d98
R13: 1ffff92000ab8e9c R14: ffff88802005a8ac R15: dffffc0000000000
 __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 __unix_dgram_recvmsg+0x1e1/0xd50 net/unix/af_unix.c:2301
 ____sys_recvmsg+0x291/0x580 net/socket.c:-1
 ___sys_recvmsg+0x1af/0x4f0 net/socket.c:2697
 do_recvmmsg+0x344/0x7a0 net/socket.c:2791
 __sys_recvmmsg net/socket.c:2870 [inline]
 __do_sys_recvmmsg net/socket.c:2893 [inline]
 __se_sys_recvmmsg net/socket.c:2886 [inline]
 __x64_sys_recvmmsg+0x18d/0x240 net/socket.c:2886
 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: 0033:0x7fef5c1b9929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fef5b408038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fef5c3e1080 RCX: 00007fef5c1b9929
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fef5c23bb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fef5c3e1080 R15: 00007ffde1b5b2b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	84 ef                	test   %ch,%bh
   2:	00 00                	add    %al,(%rax)
   4:	00 65 8b             	add    %ah,-0x75(%rbp)
   7:	05 7f 92 a6 7e       	add    $0x7ea6927f,%eax
   c:	85 c0                	test   %eax,%eax
   e:	0f 85 2d 01 00 00    	jne    0x141
  14:	65 4c 8b 35 2f 89 a6 	mov    %gs:0x7ea6892f(%rip),%r14        # 0x7ea6894b
  1b:	7e
  1c:	49 81 c6 ec 0a 00 00 	add    $0xaec,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 f2 01 00 00    	jne    0x229
  37:	41 83 3e 00          	cmpl   $0x0,(%r14)
  3b:	0f                   	.byte 0xf
  3c:	85 00                	test   %eax,(%rax)
  3e:	01 00                	add    %eax,(%rax)