general protection fault, probably for non-canonical address 0xdffffc0000000080: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000400-0x0000000000000407]
CPU: 1 PID: 9810 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:free_netdev+0x41/0x490 net/core/dev.c:10028
Code: d2 be 2b 27 00 00 48 c7 c7 40 45 fd 88 e8 07 a7 23 fb 48 8d bd 00 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0b 04 00 00 48 8b bd 00 04 00 00 e8 09 04 71 fb
RSP: 0018:ffffc90005fd7c10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88805d572000 RCX: 0000000000000001
RDX: 0000000000000080 RSI: ffffffff89bbe580 RDI: 0000000000000400
RBP: 0000000000000000 R08: ffff888060adc000 R09: ffffed100c0f083d
R10: ffff8880607841e3 R11: ffffed100c0f083c R12: 00000000fffffff4
R13: ffff8880a8162410 R14: ffff88809e178000 R15: ffff8880581194b8
FS:  00007f6a70d95700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe1b9c07d0 CR3: 00000000890b2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip6gre_init_net+0x546/0x610 net/ipv6/ip6_gre.c:1595
 ops_init+0xaf/0x420 net/core/net_namespace.c:151
 setup_net+0x2de/0x860 net/core/net_namespace.c:341
 copy_net_ns+0x293/0x590 net/core/net_namespace.c:482
 create_new_namespaces+0x3fb/0xb30 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x43d/0x8e0 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca59
Code: Bad RIP value.
RSP: 002b:00007f6a70d94c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 000000000050af60 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c73 R14: 00000000004cecac R15: 00007f6a70d956d4
Modules linked in:
---[ end trace c2a2885e65595411 ]---
RIP: 0010:free_netdev+0x41/0x490 net/core/dev.c:10028
Code: d2 be 2b 27 00 00 48 c7 c7 40 45 fd 88 e8 07 a7 23 fb 48 8d bd 00 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0b 04 00 00 48 8b bd 00 04 00 00 e8 09 04 71 fb
RSP: 0018:ffffc90005fd7c10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88805d572000 RCX: 0000000000000001
RDX: 0000000000000080 RSI: ffffffff89bbe580 RDI: 0000000000000400
RBP: 0000000000000000 R08: ffff888060adc000 R09: ffffed100c0f083d
R10: ffff8880607841e3 R11: ffffed100c0f083c R12: 00000000fffffff4
R13: ffff8880a8162410 R14: ffff88809e178000 R15: ffff8880581194b8
FS:  00007f6a70d95700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe1b9c07d0 CR3: 00000000890b2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400