==================================================================
BUG: KASAN: use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline]
BUG: KASAN: use-after-free in __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup include/linux/rhashtable.h:646 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
Read of size 4 at addr ffff88807a530008 by task syz-fuzzer/5097

CPU: 0 PID: 5097 Comm: syz-fuzzer Not tainted 6.9.0-syzkaller-12123-g531876c80004 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
 rhashtable_lookup include/linux/rhashtable.h:646 [inline]
 rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
 ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:132 [inline]
 ila_xlat_addr net/ipv6/ila/ila_xlat.c:652 [inline]
 ila_nf_input+0x1fe/0x3c0 net/ipv6/ila/ila_xlat.c:190
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 __netif_receive_skb_one_core net/core/dev.c:5624 [inline]
 __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5738
 process_backlog+0x391/0x7d0 net/core/dev.c:6067
 __napi_poll+0xcb/0x490 net/core/dev.c:6721
 napi_poll net/core/dev.c:6790 [inline]
 net_rx_action+0x7bb/0x10a0 net/core/dev.c:6906
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:724
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 58 90 87 7e e8 bb cf 09 0a <89> c3 83 f8 08 73 7a 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd e0
RSP: 0018:ffffc9000359f920 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817254f4
RDX: 0000000000000000 RSI: ffffffff8c1fe4e0 RDI: ffffffff8c1fe4a0
RBP: ffffc9000359fa88 R08: ffffffff8fad36af R09: 1ffffffff1f5a6d5
R10: dffffc0000000000 R11: fffffbfff1f5a6d6 R12: 1ffff920006b3f30
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000004
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5725
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock include/linux/rcupdate.h:781 [inline]
 __fget_files+0x49/0x470 fs/file.c:1035
 __fget_light fs/file.c:1151 [inline]
 __fdget+0x16c/0x1e0 fs/file.c:1159
 fdget include/linux/file.h:66 [inline]
 do_epoll_wait+0x12b/0x2040 fs/eventpoll.c:2445
 do_epoll_pwait+0x56/0x1e0 fs/eventpoll.c:2498
 __do_sys_epoll_pwait fs/eventpoll.c:2511 [inline]
 __se_sys_epoll_pwait fs/eventpoll.c:2505 [inline]
 __x64_sys_epoll_pwait+0x2b8/0x310 fs/eventpoll.c:2505
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x40720e
Code: 48 83 ec 38 e8 13 00 00 00 48 83 c4 38 5d c3 cc cc cc cc cc cc cc cc cc cc cc cc cc 49 89 f2 48 89 fa 48 89 ce 48 89 df 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d8 48 89 c1 48 c7 c0 ff ff ff ff 48
RSP: 002b:000000c000855748 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000040720e
RDX: 0000000000000080 RSI: 000000c000855818 RDI: 0000000000000004
RBP: 000000c000855790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000c000855820
R13: 0000000000000004 R14: 000000c00082d040 R15: 0000000000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a530
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888077c76481
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000040 ffff88801504f500 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080040004 00000001ffffefff ffff888077c76481
head: 00fff00000000040 ffff88801504f500 dead000000000122 0000000000000000
head: 0000000000000000 0000000080040004 00000001ffffefff ffff888077c76481
head: 00fff00000000003 ffffea0001e94c01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8859, tgid 8859 (syz-executor.1), ts 223450325715, free_ts 223429632004
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x2e2d/0x2ee0 mm/page_alloc.c:3402
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4660
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2264
 allocate_slab+0x5a/0x2e0 mm/slub.c:2427
 new_slab mm/slub.c:2480 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666
 __slab_alloc+0x58/0xa0 mm/slub.c:3756
 __slab_alloc_node mm/slub.c:3809 [inline]
 slab_alloc_node mm/slub.c:3988 [inline]
 __do_kmalloc_node mm/slub.c:4120 [inline]
 kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4141
 kmemdup_noprof+0x2a/0x60 mm/util.c:131
 __addrconf_sysctl_register+0xb1/0x3a0 net/ipv6/addrconf.c:7197
 addrconf_sysctl_register+0x167/0x1c0 net/ipv6/addrconf.c:7263
 ipv6_add_dev+0xcf6/0x1220 net/ipv6/addrconf.c:456
 addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3652
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
 call_netdevice_notifiers net/core/dev.c:2044 [inline]
 register_netdevice+0x1570/0x19e0 net/core/dev.c:10407
 veth_newlink+0x628/0xcd0 drivers/net/veth.c:1829
page last free pid 8132 tgid 8132 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2565
 __folio_put+0x3b9/0x620 mm/swap.c:129
 folio_put include/linux/mm.h:1508 [inline]
 free_large_kmalloc+0x105/0x1c0 mm/slub.c:4528
 kfree+0x1c4/0x360 mm/slub.c:4551
 rhashtable_free_and_destroy+0x7c6/0x920 lib/rhashtable.c:1169
 ila_xlat_exit_net+0x55/0x110 net/ipv6/ila/ila_xlat.c:626
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x802/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff88807a52ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807a52ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807a530000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffff88807a530080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807a530100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	f3 0f 1e fa          	endbr64
  19:	41 57                	push   %r15
  1b:	41 56                	push   %r14
  1d:	53                   	push   %rbx
  1e:	65 ff 05 58 90 87 7e 	incl   %gs:0x7e879058(%rip)        # 0x7e87907d
  25:	e8 bb cf 09 0a       	call   0xa09cfe5
* 2a:	89 c3                	mov    %eax,%ebx <-- trapping instruction
  2c:	83 f8 08             	cmp    $0x8,%eax
  2f:	73 7a                	jae    0xab
  31:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  38:	fc ff df
  3b:	4c                   	rex.WR
  3c:	8d                   	.byte 0x8d
  3d:	34 dd                	xor    $0xdd,%al
  3f:	e0                   	.byte 0xe0