------------[ cut here ]------------
WARNING: CPU: 1 PID: 13147 at net/mac80211/tx.c:4861 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4861 [inline]
WARNING: CPU: 1 PID: 13147 at net/mac80211/tx.c:4861 __ieee80211_beacon_get+0x178a/0x1ff0 net/mac80211/tx.c:5085
Modules linked in:
CPU: 1 PID: 13147 Comm: syz.4.2342 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4861 [inline]
RIP: 0010:__ieee80211_beacon_get+0x178a/0x1ff0 net/mac80211/tx.c:5085
Code: 27 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 22 4d 27 f8 0f 0b e9 16 ef ff ff e8 16 4d 27 f8 <0f> 0b e9 7c f2 ff ff e8 da 70 6d 00 89 d9 80 e1 07 80 c1 03 38 c1
RSP: 0000:ffffc90000dd08c0 EFLAGS: 00010246
RAX: ffffffff8951a58a RBX: ffff8880616c6a00 RCX: ffff8880775b8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000dd0af8 R08: ffff8880775b8000 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: f8f8f8f8f8f8f8f8
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920001ba128
FS:  00007f57cfde76c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffe70 CR3: 0000000073503000 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:5204
 ieee80211_beacon_get include/net/mac80211.h:4983 [inline]
 mac80211_hwsim_beacon_tx+0x104/0x900 drivers/net/wireless/mac80211_hwsim.c:1812
 __iterate_interfaces+0x225/0x4c0 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+0x4ea/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x336/0x830 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:205
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 80 fa 11 0c 48 89 de 5b e9 07 56 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d 14 7d 89 7e 65 8b 15 15 7d 89 7e 81 e2 00 01 ff 00 74
RSP: 0000:ffffc90003e0f000 EFLAGS: 00000246
RAX: ffffffff81a68794 RBX: 0000000000000000 RCX: ffff8880775b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffea0001578547 R09: 1ffffd40002af0a8
R10: dffffc0000000000 R11: fffff940002af0a9 R12: 1ffffd40002af0a9
R13: ffffea0001578540 R14: ffffea0001578540 R15: ffffea0001578548
 _compound_head include/linux/page-flags.h:198 [inline]
 put_page include/linux/mm.h:1244 [inline]
 shmem_write_end+0x434/0x630 mm/shmem.c:2520
 generic_perform_write+0x350/0x550 mm/filemap.c:3796
 __generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 __kernel_write+0x522/0x980 fs/read_write.c:539
 __dump_emit+0x258/0x380 fs/coredump.c:943
 dump_user_range+0x84/0x340 fs/coredump.c:1017
 elf_core_dump+0x2fe0/0x3530 fs/binfmt_elf.c:2285
 do_coredump+0x14e8/0x2a40 fs/coredump.c:894
 get_signal+0x531/0x12e0 kernel/signal.c:2887
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1499
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f57d1b8ee61
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f57d1e16fa0 RCX: 00007f57d1b8ee59
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f57d1c24e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f57d1e17038 R14: 00007f57d1e16fa0 R15: 00007ffce1118f68
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 90 53 48 89 fb    	add    %dl,-0x476b7ad(%rax)
   a:	e8 17 00 00 00       	call   0x26
   f:	48 8b 3d 80 fa 11 0c 	mov    0xc11fa80(%rip),%rdi        # 0xc11fa96
  16:	48 89 de             	mov    %rbx,%rsi
  19:	5b                   	pop    %rbx
  1a:	e9 07 56 44 00       	jmp    0x445626
  1f:	00 00                	add    %al,(%rax)
  21:	cc                   	int3
  22:	cc                   	int3
  23:	00 00                	add    %al,(%rax)
  25:	cc                   	int3
  26:	48 8b 04 24          	mov    (%rsp),%rax
* 2a:	65 48 8b 0d 14 7d 89 	mov    %gs:0x7e897d14(%rip),%rcx        # 0x7e897d46 <-- trapping instruction
  31:	7e
  32:	65 8b 15 15 7d 89 7e 	mov    %gs:0x7e897d15(%rip),%edx        # 0x7e897d4e
  39:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  3f:	74                   	.byte 0x74