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: 4046 Comm: syz-executor.1 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:9375 [inline] RIP: 0010:free_netdev+0x41/0x480 net/core/dev.c:10046 Code: d2 be 3d 27 00 00 48 c7 c7 a0 dc fd 88 e8 97 87 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 c9 37 69 fb RSP: 0018:ffffc90005147c10 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888090022000 RCX: ffffc90004cc9000 RDX: 0000000000000080 RSI: ffffffff89bc0e00 RDI: 0000000000000400 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888091d50463 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffff4 R13: ffff88809437c410 R14: ffff88809f4a2800 R15: ffff8880a8aa7678 FS: 00007f579321c700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8dd50eadb8 CR3: 00000000a6d24000 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: 0033:0x45c1f9 Code: Bad RIP value. RSP: 002b:00007f579321bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000034940 RCX: 000000000045c1f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000 RBP: 000000000078bf30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe0515497f R14: 00007f579321c9c0 R15: 000000000078bf0c Modules linked in: ---[ end trace bdecbb6b6f842fd0 ]--- RIP: 0010:netif_free_tx_queues net/core/dev.c:9375 [inline] RIP: 0010:free_netdev+0x41/0x480 net/core/dev.c:10046 Code: d2 be 3d 27 00 00 48 c7 c7 a0 dc fd 88 e8 97 87 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 c9 37 69 fb RSP: 0018:ffffc90005147c10 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888090022000 RCX: ffffc90004cc9000 RDX: 0000000000000080 RSI: ffffffff89bc0e00 RDI: 0000000000000400 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888091d50463 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffff4 R13: ffff88809437c410 R14: ffff88809f4a2800 R15: ffff8880a8aa7678 FS: 00007f579321c700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbc128b5000 CR3: 00000000a6d24000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400