general protection fault, probably for non-canonical address 0xdffffc000000000f: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000078-0x000000000000007f]
CPU: 0 PID: 11527 Comm: syz-executor.3 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__fib6_drop_pcpu_from.part.0+0xfc/0x280 net/ipv6/ip6_fib.c:977
Code: 48 c1 e8 03 80 3c 18 00 0f 85 36 01 00 00 4d 8b 3f 4d 85 ff 0f 84 5a ff ff ff e8 5f ca bd f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 5d 01 00 00 49 8b 47 70 48 3b 44 24 08 0f 85 31
RSP: 0018:ffffc900019ff2b8 EFLAGS: 00010206
RAX: 000000000000000f RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88801e8a1bc0 RSI: ffffffff87b50f51 RDI: 0000000000000079
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fa9a887
R10: ffffffff87b50edd R11: 0000000000000000 R12: 0000000000000007
R13: ffff888015da1ca0 R14: fffffbfff1b8a25c R15: 0000000000000009
FS:  0000000002a49400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f20000 CR3: 0000000029b3c000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:959 [inline]
 fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1020 [inline]
 fib6_purge_rt+0x6a3/0x810 net/ipv6/ip6_fib.c:1031
 fib6_del_route net/ipv6/ip6_fib.c:1982 [inline]
 fib6_del+0xa92/0x15a0 net/ipv6/ip6_fib.c:2027
 fib6_clean_node+0x398/0x5c0 net/ipv6/ip6_fib.c:2189
 fib6_walk_continue+0x4aa/0x8e0 net/ipv6/ip6_fib.c:2111
 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2159
 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2239
 __fib6_clean_all+0x120/0x290 net/ipv6/ip6_fib.c:2255
 rt6_sync_down_dev net/ipv6/route.c:4786 [inline]
 rt6_disable_ip+0x77f/0x890 net/ipv6/route.c:4791
 addrconf_ifdown.isra.0+0xf6/0x15b0 net/ipv6/addrconf.c:3706
 addrconf_notify+0x55c/0x23e0 net/ipv6/addrconf.c:3631
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2063
 call_netdevice_notifiers_extack net/core/dev.c:2075 [inline]
 call_netdevice_notifiers net/core/dev.c:2089 [inline]
 dev_close_many+0x2ff/0x620 net/core/dev.c:1664
 unregister_netdevice_many+0x3fd/0x1760 net/core/dev.c:10882
 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10839
 unregister_netdevice include/linux/netdevice.h:2855 [inline]
 __tun_detach+0x105a/0x13d0 drivers/net/tun.c:662
 tun_detach drivers/net/tun.c:679 [inline]
 tun_chr_close+0xd9/0x180 drivers/net/tun.c:3347
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x41920b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffea48d6ee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 000000000041920b
RDX: 0000001b2ce3a38c RSI: ffffffff8903511e RDI: 0000000000000006
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2ce33f44
R10: 000000000000a8c8 R11: 0000000000000293 R12: 000000000056c9e0
R13: 000000000056c9e0 R14: 000000000056bf60 R15: 000000000003545d
Modules linked in:
---[ end trace b875e1643e3b199e ]---
RIP: 0010:__fib6_drop_pcpu_from.part.0+0xfc/0x280 net/ipv6/ip6_fib.c:977
Code: 48 c1 e8 03 80 3c 18 00 0f 85 36 01 00 00 4d 8b 3f 4d 85 ff 0f 84 5a ff ff ff e8 5f ca bd f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 5d 01 00 00 49 8b 47 70 48 3b 44 24 08 0f 85 31
RSP: 0018:ffffc900019ff2b8 EFLAGS: 00010206
RAX: 000000000000000f RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88801e8a1bc0 RSI: ffffffff87b50f51 RDI: 0000000000000079
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fa9a887
R10: ffffffff87b50edd R11: 0000000000000000 R12: 0000000000000007
R13: ffff888015da1ca0 R14: fffffbfff1b8a25c R15: 0000000000000009
FS:  0000000002a49400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f20000 CR3: 0000000029b3c000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400