------------[ cut here ]------------
WARNING: CPU: 1 PID: 27854 at net/mac80211/tx.c:4944 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
WARNING: CPU: 1 PID: 27854 at net/mac80211/tx.c:4944 __ieee80211_beacon_get+0x1952/0x1f50 net/mac80211/tx.c:5265
Modules linked in:
CPU: 1 PID: 27854 Comm: syz.0.6688 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
RIP: 0010:__ieee80211_beacon_get+0x1952/0x1f50 net/mac80211/tx.c:5265
Code: ff ff ff e8 40 d3 e3 f7 0f 0b 48 8b 7c 24 20 e8 04 90 7f fe e9 dd e9 ff ff e8 2a d3 e3 f7 0f 0b e9 f1 ee ff ff e8 1e d3 e3 f7 <0f> 0b e9 61 f2 ff ff e8 12 d3 e3 f7 48 c7 c7 f0 73 fa 8d 4c 89 f6
RSP: 0018:ffffc900001e08a0 EFLAGS: 00010246
RAX: ffffffff899d0342 RBX: 0000000000000000 RCX: ffff88802d758000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0aa8 R08: ffff88802d758000 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: 1ffff9200003c12c
R13: dffffc0000000000 R14: ffff88805183e258 R15: ffff88807f7c4600
FS:  00007f392c8df6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f392b972a60 CR3: 0000000062c06000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000e58e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ieee80211_beacon_get_tim+0x5b/0x4d0 net/mac80211/tx.c:5352
 ieee80211_beacon_get include/net/mac80211.h:5264 [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+0x554/0xd60 kernel/time/hrtimer.c:1811
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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:shmem_get_folio_gfp+0x1592/0x3400 mm/shmem.c:1974
Code: ff 4c 89 ff 48 8b b4 24 f8 00 00 00 4c 89 e2 31 c9 44 8b 84 24 ec 00 00 00 4c 8b 4c 24 50 e8 05 42 00 00 41 89 c7 31 ff 89 c6 <e8> 39 a3 cb ff 48 8b ac 24 08 01 00 00 45 85 ff 48 89 2c 24 0f 84
RSP: 0018:ffffc9000cc56ed0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea0000fa52c8 RCX: ffff88802d758000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffffd40001f4a58 R08: dffffc0000000000 R09: fffffbfff215c45d
R10: fffffbfff215c45d R11: 1ffffffff215c45c R12: 000000000000056e
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 shmem_get_folio mm/shmem.c:2072 [inline]
 shmem_write_begin+0xee/0x3f0 mm/shmem.c:2556
 generic_perform_write+0x2db/0x560 mm/filemap.c:3846
 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974
 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006
 __kernel_write_iter+0x26d/0x630 fs/read_write.c:517
 dump_emit_page fs/coredump.c:950 [inline]
 dump_user_range+0x3ea/0x7f0 fs/coredump.c:977
 elf_core_dump+0x2f77/0x3490 fs/binfmt_elf.c:2354
 do_coredump+0x15ff/0x22b0 fs/coredump.c:824
 get_signal+0x10aa/0x1350 kernel/signal.c:2857
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1490
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f392b98f751
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f392bbe6090 RCX: 00007f392b98f749
RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600
RBP: 00007f392ba13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f392bbe6128 R14: 00007f392bbe6090 R15: 00007ffc6f70c8d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	ff 4c 89 ff          	decl   -0x1(%rcx,%rcx,4)
   4:	48 8b b4 24 f8 00 00 	mov    0xf8(%rsp),%rsi
   b:	00
   c:	4c 89 e2             	mov    %r12,%rdx
   f:	31 c9                	xor    %ecx,%ecx
  11:	44 8b 84 24 ec 00 00 	mov    0xec(%rsp),%r8d
  18:	00
  19:	4c 8b 4c 24 50       	mov    0x50(%rsp),%r9
  1e:	e8 05 42 00 00       	call   0x4228
  23:	41 89 c7             	mov    %eax,%r15d
  26:	31 ff                	xor    %edi,%edi
  28:	89 c6                	mov    %eax,%esi
* 2a:	e8 39 a3 cb ff       	call   0xffcba368 <-- trapping instruction
  2f:	48 8b ac 24 08 01 00 	mov    0x108(%rsp),%rbp
  36:	00
  37:	45 85 ff             	test   %r15d,%r15d
  3a:	48 89 2c 24          	mov    %rbp,(%rsp)
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84