------------[ cut here ]------------
WARNING: CPU: 0 PID: 4225 at net/mac80211/tx.c:4876 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4876 [inline]
WARNING: CPU: 0 PID: 4225 at net/mac80211/tx.c:4876 __ieee80211_beacon_get+0x178a/0x1ff0 net/mac80211/tx.c:5100
Modules linked in:
CPU: 0 PID: 4225 Comm: kworker/0:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: events nsim_fib_event_work
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4876 [inline]
RIP: 0010:__ieee80211_beacon_get+0x178a/0x1ff0 net/mac80211/tx.c:5100
Code: 26 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 92 68 26 f8 0f 0b e9 16 ef ff ff e8 86 68 26 f8 <0f> 0b e9 7c f2 ff ff e8 7a 7b 6d 00 89 d9 80 e1 07 80 c1 03 38 c1
RSP: 0000:ffffc900000078c0 EFLAGS: 00010246
RAX: ffffffff895298fa RBX: ffff888077be0600 RCX: ffff88807443bb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007af8 R08: ffff88807443bb80 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: f8f8f8f8f8f8f8f8
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000000f28
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3d3b4f CR3: 000000001ff02000 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:5219
 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:unwind_next_frame+0x1/0x1cf0 arch/x86/kernel/unwind_orc.c:423
Code: 31 c0 5b 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c 97 48 89 df e8 fd 15 89 00 eb 8d 66 2e 0f 1f 84 00 00 00 00 00 90 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 60 48 89 fb 49 be 00 00 00 00
RSP: 0000:ffffc900030ff3a8 EFLAGS: 00000287
RAX: ffffc900030ff490 RBX: ffffc900030ff408 RCX: dffffc0000000000
RDX: ffffc900030ff498 RSI: ffffc90003100000 RDI: ffffc900030ff408
RBP: ffffc900030ff440 R08: ffffc900030ff401 R09: ffffc900030ff408
R10: dffffc0000000000 R11: fffff5200061fe8d R12: 1ffff9200061fe82
R13: 1ffff9200061fe83 R14: 1ffff9200061fe81 R15: ffffc900030ff418
 __unwind_start+0x51a/0x650 arch/x86/kernel/unwind_orc.c:704
 unwind_start arch/x86/include/asm/unwind.h:60 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kfree+0xef/0x2a0 mm/slub.c:4564
 nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline]
 nsim_fib_event_work+0x3de/0x3380 drivers/net/netdevsim/fib.c:1483
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
----------------
Code disassembly (best guess):
   0:	31 c0                	xor    %eax,%eax
   2:	5b                   	pop    %rbx
   3:	41 5e                	pop    %r14
   5:	41 5f                	pop    %r15
   7:	c3                   	ret
   8:	89 d9                	mov    %ebx,%ecx
   a:	80 e1 07             	and    $0x7,%cl
   d:	80 c1 03             	add    $0x3,%cl
  10:	38 c1                	cmp    %al,%cl
  12:	7c 97                	jl     0xffffffab
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 fd 15 89 00       	call   0x891619
  1c:	eb 8d                	jmp    0xffffffab
  1e:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  25:	00 00 00
  28:	90                   	nop
  29:	55                   	push   %rbp
* 2a:	41 57                	push   %r15 <-- trapping instruction
  2c:	41 56                	push   %r14
  2e:	41 55                	push   %r13
  30:	41 54                	push   %r12
  32:	53                   	push   %rbx
  33:	48 83 ec 60          	sub    $0x60,%rsp
  37:	48 89 fb             	mov    %rdi,%rbx
  3a:	49                   	rex.WB
  3b:	be 00 00 00 00       	mov    $0x0,%esi