pim6reg1: entered promiscuous mode
pim6reg1: entered allmulticast mode
==================================================================
BUG: KASAN: global-out-of-bounds in fib6_clean_node+0x51c/0x5b0 net/ipv6/ip6_fib.c:2251
Read of size 8 at addr ffffffff9b218508 by task syz.2.2792/16227

CPU: 2 UID: 0 PID: 16227 Comm: syz.2.2792 Not tainted 6.15.0-syzkaller-10769-g7d4e49a77d99 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 fib6_clean_node+0x51c/0x5b0 net/ipv6/ip6_fib.c:2251
 fib6_walk_continue+0x452/0x8d0 net/ipv6/ip6_fib.c:2177
 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
 fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
 __fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
 rt6_sync_up+0xc9/0x170 net/ipv6/route.c:4890
 addrconf_notify+0x73d/0x19e0 net/ipv6/addrconf.c:3751
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
 call_netdevice_notifiers net/core/dev.c:2282 [inline]
 __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9497
 netif_change_flags+0x108/0x160 net/core/dev.c:9526
 dev_change_flags+0xba/0x250 net/core/dev_api.c:68
 dev_ifsioc+0x1498/0x1f70 net/core/dev_ioctl.c:565
 dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:823
 sock_do_ioctl+0x19d/0x280 net/socket.c:1204
 sock_ioctl+0x227/0x6b0 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa05b38e969
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:00007fa05c282038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa05b5b5fa0 RCX: 00007fa05b38e969
RDX: 0000200000000140 RSI: 0000000000008914 RDI: 0000000000000005
RBP: 00007fa05b410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa05b5b5fa0 R15: 00007ffde7eec4d8
 </TASK>

The buggy address belongs to the variable:
 binder_devices+0x8/0x40

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b218
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00006c8608 ffffea00006c8608 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff9b218400: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
 ffffffff9b218480: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
>ffffffff9b218500: 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
                      ^
 ffffffff9b218580: 00 00 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
 ffffffff9b218600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f9
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