IPVS: ftp: loaded support on port[0] = 21
Enabling of bearer <udp:syz0> rejected, already enabled
Enabling of bearer <udp:syz0> rejected, already enabled
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2619 Comm: kworker/u4:4 Not tainted 5.0.0-rc7+ #92
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__skb_unlink include/linux/skbuff.h:1924 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:1941 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2655 [inline]
RIP: 0010:gro_cells_destroy net/core/gro_cells.c:89 [inline]
RIP: 0010:gro_cells_destroy+0x19d/0x360 net/core/gro_cells.c:78
Code: 03 42 80 3c 20 00 0f 85 53 01 00 00 48 8d 7a 08 49 8b 47 08 49 c7 07 00 00 00 00 48 89 f9 49 c7 47 08 00 00 00 00 48 c1 e9 03 <42> 80 3c 21 00 0f 85 10 01 00 00 48 89 c1 48 89 42 08 48 c1 e9 03
RSP: 0018:ffff8880a11b79a8 EFLAGS: 00010203
RAX: ffffffffe8ffffd6 RBX: ffffe8ffffd674c0 RCX: 0ed71ffffd1ffffb
RDX: 76b8ffffe8ffffd6 RSI: ffffffff8582b9ea RDI: 76b8ffffe8ffffde
RBP: ffff8880a11b7a08 R08: ffff8880a0c98280 R09: fffffbfff1263405
R10: fffffbfff1263404 R11: ffffffff8931a023 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffe8ffffd674d0 R15: ffffe8ffffd674c2
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38cd117028 CR3: 00000000a663d000 CR4: 00000000001406e0
Call Trace:
 ip_tunnel_dev_free+0x19/0x60 net/ipv4/ip_tunnel.c:966
 netdev_run_todo+0x51c/0x7d0 net/core/dev.c:8888
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117
 ip_tunnel_delete_nets+0x423/0x5f0 net/ipv4/ip_tunnel.c:1080
 ipip_exit_batch_net+0x23/0x30 net/ipv4/ipip.c:663
 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 58ea44cf74b083ba ]---
RIP: 0010:__skb_unlink include/linux/skbuff.h:1924 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:1941 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2655 [inline]
RIP: 0010:gro_cells_destroy net/core/gro_cells.c:89 [inline]
RIP: 0010:gro_cells_destroy+0x19d/0x360 net/core/gro_cells.c:78
Code: 03 42 80 3c 20 00 0f 85 53 01 00 00 48 8d 7a 08 49 8b 47 08 49 c7 07 00 00 00 00 48 89 f9 49 c7 47 08 00 00 00 00 48 c1 e9 03 <42> 80 3c 21 00 0f 85 10 01 00 00 48 89 c1 48 89 42 08 48 c1 e9 03
RSP: 0018:ffff8880a11b79a8 EFLAGS: 00010203
RAX: ffffffffe8ffffd6 RBX: ffffe8ffffd674c0 RCX: 0ed71ffffd1ffffb
RDX: 76b8ffffe8ffffd6 RSI: ffffffff8582b9ea RDI: 76b8ffffe8ffffde
RBP: ffff8880a11b7a08 R08: ffff8880a0c98280 R09: fffffbfff1263405
R10: fffffbfff1263404 R11: ffffffff8931a023 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffe8ffffd674d0 R15: ffffe8ffffd674c2
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ae5ba7000 CR3: 000000006b067000 CR4: 00000000001406f0