------------[ cut here ]------------
WARNING: CPU: 0 PID: 8856 at net/mac80211/tx.c:4944 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
WARNING: CPU: 0 PID: 8856 at net/mac80211/tx.c:4944 __ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5345
Modules linked in:
CPU: 0 PID: 8856 Comm: syz.1.866 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:4944 [inline]
RIP: 0010:__ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5345
Code: 24 4c 89 e7 e8 fe 0f 0a f8 45 31 f6 4c 8b bc 24 a0 00 00 00 e9 7a fe ff ff e8 f9 6f d1 f7 0f 0b e9 f6 f7 ff ff e8 ed 6f d1 f7 <0f> 0b e9 48 fb ff ff e8 e1 6f d1 f7 48 c7 c7 10 f1 fa 8d 4c 89 e6
RSP: 0000:ffffc90000007a30 EFLAGS: 00010246
RAX: ffffffff89b10563 RBX: ffffffff89b0f366 RCX: ffff88802becd940
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802becd940 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff888066982228
R13: dffffc0000000000 R14: ffff888066982760 R15: ffff888055ddec24
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe1aff8 CR3: 00000000658c5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211_beacon_get_tim+0x63/0x4e0 net/mac80211/tx.c:5472
ieee80211_beacon_get include/net/mac80211.h:5335 [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+0x54a/0xd50 kernel/time/hrtimer.c:1811
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x714/0x20b0 arch/x86/kernel/unwind_orc.c:471
Code: 89 f7 e8 6f 60 9a 00 49 8b 16 4d 8d 7c 24 01 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 86 15 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 84 17 02 00 00 44 89 f9 80 e1 07 38 c1 0f
RSP: 0000:ffffc90004606570 EFLAGS: 00000a07
RAX: 1ffffffff1d4f14d RBX: ffffc90004606648 RCX: ffffffff8e3517dc
RDX: ffffc90004607200 RSI: ffffffff8e3517d8 RDI: ffffffff81391adf
RBP: ffffffff8ea78a70 R08: 0000000000000001 R09: 0000000000000009
R10: dffffc0000000000 R11: fffff520008c0cd5 R12: ffffffff8ea78a6c
R13: dffffc0000000000 R14: ffffc90004606680 R15: ffffffff8ea78a6d
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__set_page_owner+0x19/0x60 mm/page_owner.c:190
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
prep_new_page mm/page_alloc.c:2566 [inline]
get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
__folio_alloc+0xe/0x30 mm/page_alloc.c:5689
vma_alloc_folio+0x4a3/0x900 mm/mempolicy.c:2243
shmem_alloc_folio mm/shmem.c:1589 [inline]
shmem_alloc_and_acct_folio+0x463/0xbc0 mm/shmem.c:1613
shmem_get_folio_gfp+0x1361/0x3400 mm/shmem.c:1941
shmem_get_folio mm/shmem.c:2072 [inline]
shmem_write_begin+0xee/0x3f0 mm/shmem.c:2556
generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862
__generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989
__kernel_write_iter+0x285/0x650 fs/read_write.c:517
dump_emit_page fs/coredump.c:950 [inline]
dump_user_range+0x412/0x850 fs/coredump.c:977
elf_core_dump+0x30a6/0x35d0 fs/binfmt_elf.c:2354
do_coredump+0x165b/0x22f0 fs/coredump.c:824
get_signal+0x10aa/0x1350 kernel/signal.c:2857
arch_do_signal_or_restart+0xc4/0x1350 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:1485
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f0765a52877
Code: e8 8e fa ff ff 89 f2 48 8d 3d 0d 40 1b 00 48 8d 35 c4 fa 1d 00 31 c0 e8 e7 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007f0766a1d120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f0765b9cdd9
RDX: 00007f0766a1d140 RSI: 00007f0766a1d270 RDI: 000000000000000b
RBP: 00007f0765c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f0765e16128 R14: 00007f0765e16090 R15: 00007ffd7c85c188
----------------
Code disassembly (best guess):
0: 89 f7 mov %esi,%edi
2: e8 6f 60 9a 00 call 0x9a6076
7: 49 8b 16 mov (%r14),%rdx
a: 4d 8d 7c 24 01 lea 0x1(%r12),%r15
f: 4c 89 e0 mov %r12,%rax
12: 48 c1 e8 03 shr $0x3,%rax
16: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
1b: 84 c0 test %al,%al
1d: 0f 85 86 15 00 00 jne 0x15a9
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 84 17 02 00 00 je 0x24e
37: 44 89 f9 mov %r15d,%ecx
3a: 80 e1 07 and $0x7,%cl
3d: 38 c1 cmp %al,%cl
3f: 0f .byte 0xf