general protection fault, probably for non-canonical address 0xdffffc000000001f: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000f8-0x00000000000000ff] CPU: 1 PID: 29969 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10b/0x390 net/ipv6/ip6_fib.c:978 Code: 48 c1 ea 03 80 3c 1a 00 0f 85 19 02 00 00 4c 8b 38 4d 85 ff 0f 84 7a ff ff ff e8 70 62 ac f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 4b 02 00 00 49 8b 47 70 48 3b 04 24 0f 85 52 ff RSP: 0018:ffffc900016de540 EFLAGS: 00010203 RAX: 000000000000001f RBX: dffffc0000000000 RCX: ffffc9001225b000 RDX: 0000000000040000 RSI: ffffffff87c86040 RDI: 00000000000000fc RBP: 0000000000000001 R08: 0000000000000001 R09: ffffffff9025f947 R10: ffffffff87c85fd4 R11: 0000000000000000 R12: 0000000000000002 R13: ffff8880306252a0 R14: ffffed10060c4a5e R15: 000000000000008c FS: 00007fc57f7ad700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2df23000 CR3: 00000000153ff000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:960 [inline] fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1021 [inline] fib6_purge_rt+0x6a3/0x810 net/ipv6/ip6_fib.c:1032 fib6_del_route net/ipv6/ip6_fib.c:1983 [inline] fib6_del+0xa92/0x15a0 net/ipv6/ip6_fib.c:2028 fib6_clean_node+0x398/0x5c0 net/ipv6/ip6_fib.c:2190 fib6_walk_continue+0x4aa/0x8e0 net/ipv6/ip6_fib.c:2112 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2160 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2240 __fib6_clean_all+0x120/0x290 net/ipv6/ip6_fib.c:2256 rt6_sync_down_dev net/ipv6/route.c:4892 [inline] rt6_disable_ip+0x827/0x930 net/ipv6/route.c:4897 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:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8788 dev_change_flags+0x112/0x170 net/core/dev.c:8824 do_setlink+0x90a/0x3900 net/core/rtnetlink.c:2710 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3373 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488 rtnetlink_rcv_msg+0x44e/0xb70 net/core/rtnetlink.c:5550 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc57f7ad188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffad82765f R14: 00007fc57f7ad300 R15: 0000000000022000 Modules linked in: ---[ end trace 5faff8fd5ec459be ]--- RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10b/0x390 net/ipv6/ip6_fib.c:978 Code: 48 c1 ea 03 80 3c 1a 00 0f 85 19 02 00 00 4c 8b 38 4d 85 ff 0f 84 7a ff ff ff e8 70 62 ac f9 49 8d 7f 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 4b 02 00 00 49 8b 47 70 48 3b 04 24 0f 85 52 ff RSP: 0018:ffffc900016de540 EFLAGS: 00010203 RAX: 000000000000001f RBX: dffffc0000000000 RCX: ffffc9001225b000 RDX: 0000000000040000 RSI: ffffffff87c86040 RDI: 00000000000000fc RBP: 0000000000000001 R08: 0000000000000001 R09: ffffffff9025f947 R10: ffffffff87c85fd4 R11: 0000000000000000 R12: 0000000000000002 R13: ffff8880306252a0 R14: ffffed10060c4a5e R15: 000000000000008c FS: 00007fc57f7ad700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2df23000 CR3: 00000000153ff000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400