==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881cde4f1c8 by task swapper/1/0

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.276-syzkaller-00021-g58de09405d1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 hlist_add_head include/linux/list.h:814 [inline]
 enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
 __internal_add_timer kernel/time/timer.c:554 [inline]
 internal_add_timer+0x240/0x430 kernel/time/timer.c:604
 __mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573
Code: 90 90 90 90 90 90 90 90 90 90 90 e8 2b 62 e0 fd bf 01 00 00 00 89 c6 e8 3f ab d7 fc 0f 1f 44 00 00 0f 00 2d a3 b8 53 00 fb f4 <e8> 0c 62 e0 fd bf ff ff ff ff 89 c6 e9 20 ab d7 fc 41 57 41 56 53
RSP: 0018:ffff8881f5dffd78 EFLAGS: 000002d2 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff8881f5dcde80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8881f5dffe80 R08: ffffffff82316961 R09: ffffed103ebb9bd1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff864b6ce8
R13: ffff8881f5dcde80 R14: 1ffff1103ebb9bd0 R15: 0000000000000001
 default_idle_call kernel/sched/idle.c:94 [inline]
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x248/0x660 kernel/sched/idle.c:264
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:356
 start_secondary+0x3a5/0x460 arch/x86/kernel/smpboot.c:277
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

The buggy address belongs to the page:
page:ffffea00073793c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea00073793c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152dc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 __alloc_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 __get_free_pages+0xa/0x30 mm/page_alloc.c:4937
 alloc_one_pg_vec_page net/packet/af_packet.c:4283 [inline]
 alloc_pg_vec net/packet/af_packet.c:4313 [inline]
 packet_set_ring+0x71d/0x23f0 net/packet/af_packet.c:4398
 packet_setsockopt+0xb71/0x1700 net/packet/af_packet.c:3752
 __sys_setsockopt+0x4b4/0x840 net/socket.c:2093
 __do_sys_setsockopt net/socket.c:2109 [inline]
 __se_sys_setsockopt net/socket.c:2106 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2106
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages mm/page_alloc.c:4961 [inline]
 free_pages+0xf6/0x1b0 mm/page_alloc.c:4969
 free_pg_vec net/packet/af_packet.c:4269 [inline]
 packet_set_ring+0x18db/0x23f0 net/packet/af_packet.c:4488
 packet_release+0x759/0xc80 net/packet/af_packet.c:3083
 __sock_release net/socket.c:591 [inline]
 sock_close+0xc7/0x220 net/socket.c:1277
 __fput+0x262/0x680 fs/file_table.c:281
 task_work_run+0x140/0x170 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881cde4f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881cde4f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881cde4f180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881cde4f200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881cde4f280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e31aa067 P4D 1e31aa067 PUD 1d95ec067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 17 Comm: ksoftirqd/1 Tainted: G    B             5.4.276-syzkaller-00021-g58de09405d1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f5e2fb58 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881f5e18fc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881cde4f1c0
RBP: ffff8881f5e2fd08 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa370
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cde4f1c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e3d37000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:603
 smpboot_thread_fn+0x545/0x930 kernel/smpboot.c:165
 kthread+0x2da/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
CR2: 0000000000000000
---[ end trace 4448e53c4b5f4c1f ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f5e2fb58 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881f5e18fc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881cde4f1c0
RBP: ffff8881f5e2fd08 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa370
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881cde4f1c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e3d37000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	e8 2b 62 e0 fd       	call   0xfde0623b
  10:	bf 01 00 00 00       	mov    $0x1,%edi
  15:	89 c6                	mov    %eax,%esi
  17:	e8 3f ab d7 fc       	call   0xfcd7ab5b
  1c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  21:	0f 00 2d a3 b8 53 00 	verw   0x53b8a3(%rip)        # 0x53b8cb
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	e8 0c 62 e0 fd       	call   0xfde0623b <-- trapping instruction
  2f:	bf ff ff ff ff       	mov    $0xffffffff,%edi
  34:	89 c6                	mov    %eax,%esi
  36:	e9 20 ab d7 fc       	jmp    0xfcd7ab5b
  3b:	41 57                	push   %r15
  3d:	41 56                	push   %r14
  3f:	53                   	push   %rbx