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: 28220 Comm: syz-executor.1 Not tainted 5.8.0-rc6-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:9357 [inline]
RIP: 0010:free_netdev+0x3e/0x350 net/core/dev.c:10028
Code: 00 fc ff df e8 43 1f 07 fb 48 c7 c7 a3 8b 28 89 be 2b 27 00 00 31 d2 e8 20 09 e4 fa 49 8d be 00 04 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 e6 2c 46 fb 49 8b be 00 04 00 00 e8 ea 43
RSP: 0018:ffffc900064d7bf0 EFLAGS: 00010202
RAX: 0000000000000080 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff894e9460 RDI: 0000000000000400
RBP: 00000000fffffff4 R08: ffffffff8733ab57 R09: fffffbfff12f75f9
R10: fffffbfff12f75f9 R11: 0000000000000000 R12: ffff8880a1ef0180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880a75c5410
FS:  00007efc028ec700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e2eecc480 CR3: 00000000936ab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip6gre_init_net+0x24a/0x2e0 net/ipv6/ip6_gre.c:1595
 ops_init+0x320/0x410 net/core/net_namespace.c:151
 setup_net+0x1cb/0x770 net/core/net_namespace.c:341
 copy_net_ns+0x339/0x540 net/core/net_namespace.c:482
 create_new_namespaces+0x52e/0x9f0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x123/0x190 kernel/nsproxy.c:231
 ksys_unshare+0x463/0x950 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3049
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007efc028ebc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000034940 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000060000000
RBP: 000000000078bf30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fffd8e0b58f R14: 00007efc028ec9c0 R15: 000000000078bf0c
Modules linked in:
---[ end trace 840055a2e0454c9f ]---
RIP: 0010:netif_free_tx_queues net/core/dev.c:9357 [inline]
RIP: 0010:free_netdev+0x3e/0x350 net/core/dev.c:10028
Code: 00 fc ff df e8 43 1f 07 fb 48 c7 c7 a3 8b 28 89 be 2b 27 00 00 31 d2 e8 20 09 e4 fa 49 8d be 00 04 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 e6 2c 46 fb 49 8b be 00 04 00 00 e8 ea 43
RSP: 0018:ffffc900064d7bf0 EFLAGS: 00010202
RAX: 0000000000000080 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff894e9460 RDI: 0000000000000400
RBP: 00000000fffffff4 R08: ffffffff8733ab57 R09: fffffbfff12f75f9
R10: fffffbfff12f75f9 R11: 0000000000000000 R12: ffff8880a1ef0180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880a75c5410
FS:  00007efc028ec700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f969e6cf028 CR3: 00000000936ab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400