syzbot

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WARNING: CPU: 1 PID: 4582 at net/mac80211/tx.c:4944 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
WARNING: CPU: 1 PID: 4582 at net/mac80211/tx.c:4944 __ieee80211_beacon_get+0x1952/0x1f50 net/mac80211/tx.c:5265
Modules linked in:
CPU: 1 PID: 4582 Comm: syz.4.81 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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 30 36 e4 f7 0f 0b 48 8b 7c 24 20 e8 d4 a4 7f fe e9 dd e9 ff ff e8 1a 36 e4 f7 0f 0b e9 f1 ee ff ff e8 0e 36 e4 f7 <0f> 0b e9 61 f2 ff ff e8 02 36 e4 f7 48 c7 c7 f0 7e fa 8d 4c 89 f6
RSP: 0018:ffffc900001e08a0 EFLAGS: 00010246
RAX: ffffffff899c9a82 RBX: 0000000000000000 RCX: ffff88802d8b5940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0aa8 R08: ffff88802d8b5940 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: 1ffff9200003c12c
R13: dffffc0000000000 R14: ffff888059182258 R15: ffff888026e22e00
FS:  000055556cf72500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f863fff CR3: 0000000072dd7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 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:1752 [inline]
 __hrtimer_run_queues+0x554/0xd60 kernel/time/hrtimer.c:1816
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1833
 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_add_to_page_cache+0x9e7/0x1c00 include/linux/swap.h:-1
Code: bf db 13 00 89 de 81 e6 ff 0f 00 00 31 ff 48 89 b4 24 80 00 00 00 e8 08 5b cb ff 48 8d 43 48 48 8d 53 51 49 81 c6 a8 01 00 00 <49> bd fc ff ff ff 03 00 00 00 4c 89 74 24 60 49 c1 ee 03 4c 89 74
RSP: 0018:ffffc9000397f580 EFLAGS: 00000296
RAX: ffffea0001492d08 RBX: ffffea0001492cc0 RCX: ffff88802d8b5940
RDX: ffffea0001492d11 RSI: 0000000000000cc0 RDI: 0000000000000000
RBP: ffffc9000397f6f0 R08: dffffc0000000000 R09: fffffbfff1c3eea6
R10: fffffbfff1c3eea6 R11: 1ffffffff1c3eea5 R12: 0000000000000cc0
R13: dffffc0000000000 R14: ffff88805c87e3c0 R15: 0000000000000000
 shmem_get_folio_gfp+0x158b/0x3400 mm/shmem.c:1971
 shmem_fault+0x1be/0x7b0 mm/shmem.c:2156
 __do_fault+0x13b/0x4e0 mm/memory.c:4280
 do_read_fault mm/memory.c:4631 [inline]
 do_fault mm/memory.c:4760 [inline]
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5173 [inline]
 handle_mm_fault+0x28ca/0x3e70 mm/memory.c:5294
 faultin_page mm/gup.c:1026 [inline]
 __get_user_pages+0x3ff/0xeb0 mm/gup.c:1250
 populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607
 __mm_populate+0x248/0x370 mm/gup.c:1721
 mm_populate include/linux/mm.h:2837 [inline]
 vm_mmap_pgoff+0x203/0x2b0 mm/util.c:525
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fde0af8eba9
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:00007ffedfc87378 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fde0b1d5fa0 RCX: 00007fde0af8eba9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fde0b011e19 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde0b1d5fa0 R14: 00007fde0b1d5fa0 R15: 0000000000000006
 </TASK>
----------------
Code disassembly (best guess):
   0:	bf db 13 00 89       	mov    $0x890013db,%edi
   5:	de 81 e6 ff 0f 00    	fiadds 0xfffe6(%rcx)
   b:	00 31                	add    %dh,(%rcx)
   d:	ff 48 89             	decl   -0x77(%rax)
  10:	b4 24                	mov    $0x24,%ah
  12:	80 00 00             	addb   $0x0,(%rax)
  15:	00 e8                	add    %ch,%al
  17:	08 5b cb             	or     %bl,-0x35(%rbx)
  1a:	ff 48 8d             	decl   -0x73(%rax)
  1d:	43                   	rex.XB
  1e:	48                   	rex.W
  1f:	48 8d 53 51          	lea    0x51(%rbx),%rdx
  23:	49 81 c6 a8 01 00 00 	add    $0x1a8,%r14
* 2a:	49 bd fc ff ff ff 03 	movabs $0x3fffffffc,%r13 <-- trapping instruction
  31:	00 00 00
  34:	4c 89 74 24 60       	mov    %r14,0x60(%rsp)
  39:	49 c1 ee 03          	shr    $0x3,%r14
  3d:	4c                   	rex.WR
  3e:	89                   	.byte 0x89
  3f:	74                   	.byte 0x74