==================================================================
BUG: KASAN: use-after-free in decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3373
Read of size 1 at addr ffff88802529bf70 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-syzkaller-00048-gde5c208d533a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3373
 __xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3479
 xfrm_decode_session include/net/xfrm.h:1160 [inline]
 vti6_tnl_xmit+0x419/0x1fe0 net/ipv6/ip6_vti.c:577
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one net/core/dev.c:3588 [inline]
 dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3604
 sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342
 qdisc_restart net/sched/sch_generic.c:407 [inline]
 __qdisc_run+0x4c0/0x1720 net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3878 [inline]
 __dev_queue_xmit+0x217a/0x3900 net/core/dev.c:4219
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1557
 neigh_output include/net/neighbour.h:549 [inline]
 ip6_finish_output2+0x564/0x1520 net/ipv6/ip6_output.c:134
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0x844/0x1170 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x1ed/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:451 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ndisc_send_skb+0xa64/0x1740 net/ipv6/ndisc.c:507
 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:717
 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3931
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:731
Code: ff ff ff 48 89 df e8 f4 1e 4c f8 e9 55 ff ff ff 4c 89 e7 e8 e7 1e 4c f8 eb 96 0f 1f 44 00 00 eb 07 0f 00 2d 17 0b 4d 00 fb f4 <c3> cc cc cc cc 41 55 41 54 55 48 89 fd 53 e8 82 fb ff f7 e8 7d 0d
RSP: 0018:ffffffff8ba07e18 EFLAGS: 00000202
RAX: 0000000000da7e5b RBX: ffffffff8babc940 RCX: ffffffff8976adf1
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88802c83afd3
R10: ffffed10059075fa R11: 0000000000000001 R12: fffffbfff1757928
R13: 0000000000000000 R14: ffffffff8dbade10 R15: 0000000000000000
 default_idle_call+0x80/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x401/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:726
 arch_call_rest_init+0xf/0x14 init/main.c:882
 start_kernel+0x46e/0x48f init/main.c:1137
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000094a6c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x2529b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 3693, tgid 3688 (syz-fuzzer), ts 2962252089193, free_ts 2962268547640
 prep_new_page mm/page_alloc.c:2456 [inline]
 get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198
 __alloc_pages_slowpath.constprop.0+0x2e9/0x2160 mm/page_alloc.c:4973
 __alloc_pages+0x436/0x510 mm/page_alloc.c:5439
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
 folio_alloc+0x1c/0x70 mm/mempolicy.c:2282
 filemap_alloc_folio+0x8e/0xb0 mm/filemap.c:996
 page_cache_ra_unbounded+0x1af/0x550 mm/readahead.c:242
 do_page_cache_ra mm/readahead.c:293 [inline]
 page_cache_ra_order+0x680/0x940 mm/readahead.c:548
 do_sync_mmap_readahead mm/filemap.c:3047 [inline]
 filemap_fault+0x1605/0x24e0 mm/filemap.c:3139
 __do_fault+0x10d/0x650 mm/memory.c:4165
 do_read_fault mm/memory.c:4511 [inline]
 do_fault mm/memory.c:4640 [inline]
 handle_pte_fault mm/memory.c:4903 [inline]
 __handle_mm_fault+0x2739/0x3f50 mm/memory.c:5042
 handle_mm_fault+0x1c8/0x790 mm/memory.c:5140
 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1371 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421
 free_unref_page_prepare mm/page_alloc.c:3343 [inline]
 free_unref_page_list+0x16f/0xf80 mm/page_alloc.c:3475
 shrink_page_list+0x2d27/0x3a50 mm/vmscan.c:1979
 shrink_inactive_list mm/vmscan.c:2386 [inline]
 shrink_list mm/vmscan.c:2616 [inline]
 shrink_lruvec+0xccf/0x2620 mm/vmscan.c:2933
 shrink_node_memcgs mm/vmscan.c:3122 [inline]
 shrink_node+0x84a/0x1db0 mm/vmscan.c:3245
 kswapd_shrink_node mm/vmscan.c:4024 [inline]
 balance_pgdat+0x8ef/0x1570 mm/vmscan.c:4215
 kswapd+0x7a5/0xf80 mm/vmscan.c:4475
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

Memory state around the buggy address:
 ffff88802529be00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802529be80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802529bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff88802529bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802529c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	48 89 df             	mov    %rbx,%rdi
   3:	e8 f4 1e 4c f8       	callq  0xf84c1efc
   8:	e9 55 ff ff ff       	jmpq   0xffffff62
   d:	4c 89 e7             	mov    %r12,%rdi
  10:	e8 e7 1e 4c f8       	callq  0xf84c1efc
  15:	eb 96                	jmp    0xffffffad
  17:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  1c:	eb 07                	jmp    0x25
  1e:	0f 00 2d 17 0b 4d 00 	verw   0x4d0b17(%rip)        # 0x4d0b3c
  25:	fb                   	sti
  26:	f4                   	hlt
* 27:	c3                   	retq <-- trapping instruction
  28:	cc                   	int3
  29:	cc                   	int3
  2a:	cc                   	int3
  2b:	cc                   	int3
  2c:	41 55                	push   %r13
  2e:	41 54                	push   %r12
  30:	55                   	push   %rbp
  31:	48 89 fd             	mov    %rdi,%rbp
  34:	53                   	push   %rbx
  35:	e8 82 fb ff f7       	callq  0xf7fffbbc
  3a:	e8                   	.byte 0xe8
  3b:	7d 0d                	jge    0x4a