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: 30211 Comm: syz-executor.2 Not tainted 5.8.0-rc3-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 63 00 08 fb 48 c7 c7 b3 46 08 89 be 2b 27 00 00 31 d2 e8 30 f1 e4 fa 49 8d be 00 04 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 26 ff 46 fb 49 8b be 00 04 00 00 e8 8a 15 RSP: 0018:ffffc9001045fbf0 EFLAGS: 00010202 RAX: 0000000000000080 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff892e9460 RDI: 0000000000000400 RBP: 00000000fffffff4 R08: ffffffff873272f7 R09: ffffed10126c3005 R10: ffffed10126c3005 R11: 0000000000000000 R12: ffff8881bc5e4200 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888078961410 FS: 00007f46983a2700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056040eac8888 CR3: 00000001f239e000 CR4: 00000000001406f0 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:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb29 Code: Bad RIP value. RSP: 002b:00007f46983a1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 000000000050bae0 RCX: 000000000045cb29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c91 R14: 00000000004ceebe R15: 00007f46983a26d4 Modules linked in: ---[ end trace 0ca31ebf545ebdea ]--- 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 63 00 08 fb 48 c7 c7 b3 46 08 89 be 2b 27 00 00 31 d2 e8 30 f1 e4 fa 49 8d be 00 04 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 26 ff 46 fb 49 8b be 00 04 00 00 e8 8a 15 RSP: 0018:ffffc9001045fbf0 EFLAGS: 00010202 RAX: 0000000000000080 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff892e9460 RDI: 0000000000000400 RBP: 00000000fffffff4 R08: ffffffff873272f7 R09: ffffed10126c3005 R10: ffffed10126c3005 R11: 0000000000000000 R12: ffff8881bc5e4200 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888078961410 FS: 00007f46983a2700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001f239e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400