general protection fault, probably for non-canonical address 0xdffffc0000000080: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000400-0x0000000000000407]
CPU: 0 PID: 30823 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:netif_free_tx_queues net/core/dev.c:9366 [inline]
RIP: 0010:free_netdev+0x41/0x480 net/core/dev.c:10037
Code: d2 be 34 27 00 00 48 c7 c7 a0 d4 fd 88 e8 c7 c5 1b 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 f4 03 00 00 48 8b bd 00 04 00 00 e8 09 52 69 fb
RSP: 0018:ffffc9000759fc10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888095bac000 RCX: ffffffff86fb541b
RDX: 0000000000000080 RSI: ffffffff89bc0e00 RDI: 0000000000000400
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888073ca24e3
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffff4
R13: ffff88807bb85410 R14: ffff888079d48800 R15: ffff8880695b54b8
FS:  00007f9fa87e9700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564e12965160 CR3: 000000009618c000 CR4: 00000000001406f0
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/0x470 net/core/net_namespace.c:151
 setup_net+0x2d8/0x850 net/core/net_namespace.c:341
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2979
 __do_sys_unshare kernel/fork.c:3047 [inline]
 __se_sys_unshare kernel/fork.c:3045 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3045
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f9fa87e8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000034980 RCX: 000000000045c1d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000078bf30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fff5dd14d9f R14: 00007f9fa87e99c0 R15: 000000000078bf0c
Modules linked in:
---[ end trace f92d6f3d74f64c61 ]---
RIP: 0010:netif_free_tx_queues net/core/dev.c:9366 [inline]
RIP: 0010:free_netdev+0x41/0x480 net/core/dev.c:10037
Code: d2 be 34 27 00 00 48 c7 c7 a0 d4 fd 88 e8 c7 c5 1b 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 f4 03 00 00 48 8b bd 00 04 00 00 e8 09 52 69 fb
RSP: 0018:ffffc9000759fc10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888095bac000 RCX: ffffffff86fb541b
RDX: 0000000000000080 RSI: ffffffff89bc0e00 RDI: 0000000000000400
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888073ca24e3
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffff4
R13: ffff88807bb85410 R14: ffff888079d48800 R15: ffff8880695b54b8
FS:  00007f9fa87e9700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f499f264000 CR3: 000000009618c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400