IPVS: ftp: loaded support on port[0] = 21
BUG: kernel NULL pointer dereference, address: 0000000000000427
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 11d6d0067 P4D 11d6d0067 PUD 11d4da067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 27472 Comm: syz-executor.0 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:freelist_dereference mm/slub.c:272 [inline]
RIP: 0010:get_freepointer mm/slub.c:279 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:293 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:2858 [inline]
RIP: 0010:slab_alloc mm/slub.c:2899 [inline]
RIP: 0010:__kmalloc_track_caller+0xb0/0x210 mm/slub.c:4464
Code: 39 f2 75 e7 48 8b 01 48 83 79 10 00 48 89 04 24 0f 84 2a 01 00 00 48 85 c0 0f 84 21 01 00 00 49 8b 3f 41 8b 4f 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 27 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
RSP: 0018:ffffc90003f6fae0 EFLAGS: 00010246
RAX: 0000000000000427 RBX: ffffc90003f6fba0 RCX: 0000000000000000
RDX: 0000000000129bf9 RSI: 0000000000129bf9 RDI: 0000000000030250
RBP: 0000000000000cc0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000003 R12: 0000000000000005
R13: ffff888100041e00 R14: ffffffff81e7a4ee R15: ffff888100041e00
FS:  0000000001727940(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000427 CR3: 000000011d0fd000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kvasprintf+0x62/0xc0 lib/kasprintf.c:25
 kobject_set_name_vargs+0x1e/0x90 lib/kobject.c:289
 kobject_add_varg lib/kobject.c:384 [inline]
 kobject_init_and_add+0x5d/0xa0 lib/kobject.c:473
 netdev_queue_add_kobject net/core/net-sysfs.c:1553 [inline]
 netdev_queue_update_kobjects+0x6e/0x140 net/core/net-sysfs.c:1598
 register_queue_kobjects net/core/net-sysfs.c:1659 [inline]
 netdev_register_kobject+0xeb/0x170 net/core/net-sysfs.c:1902
 register_netdevice+0x44a/0x680 net/core/dev.c:10046
 __ip_tunnel_create+0x1a3/0x270 net/ipv4/ip_tunnel.c:267
 ip_tunnel_init_net+0x196/0x4c0 net/ipv4/ip_tunnel.c:1063
 ops_init+0x34/0x170 net/core/net_namespace.c:152
 setup_net+0x109/0x290 net/core/net_namespace.c:342
 copy_net_ns+0x127/0x2b0 net/core/net_namespace.c:483
 create_new_namespaces+0x18d/0x2b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x50/0xc0 kernel/nsproxy.c:226
 ksys_unshare+0x18b/0x380 kernel/fork.c:2957
 __do_sys_unshare kernel/fork.c:3025 [inline]
 __se_sys_unshare kernel/fork.c:3023 [inline]
 __x64_sys_unshare+0x9/0x10 kernel/fork.c:3023
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460987
Code: 00 00 00 b8 63 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 2d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff14d26b08 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fff14d26b50 RCX: 0000000000460987
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000419720
R13: 00007fff14d26da8 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000427
---[ end trace 9b962bfd3f1bbc31 ]---