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: 8473 Comm: kworker/u4:8 Not tainted 5.0.0+ #97
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:1929 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:1945 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2656 [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:ffff88806045f9c8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffe8ffffc64de0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff858410ca RDI: 0000000000000008
RBP: ffff88806045fa28 R08: ffff888060452440 R09: fffffbfff1263645
R10: fffffbfff1263644 R11: ffffffff8931b223 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffe8ffffc64df0 R15: ffffe8ffffc64e10
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000073c000 CR3: 000000006e399000 CR4: 00000000001406e0
Call Trace:
 ip6gre_dev_free+0x19/0x60 net/ipv6/ip6_gre.c:1384
 netdev_run_todo+0x51c/0x7d0 net/core/dev.c:8970
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:116
 ip6gre_exit_batch_net+0x53a/0x750 net/ipv6/ip6_gre.c:1603
 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:
kobject: 'loop4' (0000000024837faf): kobject_uevent_env
kobject: 'loop4' (0000000024837faf): fill_kobj_path: path = '/devices/virtual/block/loop4'
---[ end trace 81ff5002b047e6ab ]---
RIP: 0010:__skb_unlink include/linux/skbuff.h:1929 [inline]
RIP: 0010:__skb_dequeue include/linux/skbuff.h:1945 [inline]
RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2656 [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
kobject: 'loop5' (000000002798f045): kobject_uevent_env
kobject: 'loop5' (000000002798f045): fill_kobj_path: path = '/devices/virtual/block/loop5'
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
kobject: 'loop3' (000000003fc420f3): kobject_uevent_env
kobject: 'loop3' (000000003fc420f3): fill_kobj_path: path = '/devices/virtual/block/loop3'
RSP: 0018:ffff88806045f9c8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffe8ffffc64de0 RCX: 0000000000000001
kobject: 'loop2' (000000006d55b7ee): kobject_uevent_env
RDX: 0000000000000000 RSI: ffffffff858410ca RDI: 0000000000000008
kobject: 'loop2' (000000006d55b7ee): fill_kobj_path: path = '/devices/virtual/block/loop2'
RBP: ffff88806045fa28 R08: ffff888060452440 R09: fffffbfff1263645
R10: fffffbfff1263644 R11: ffffffff8931b223 R12: dffffc0000000000
kobject: 'loop3' (000000003fc420f3): kobject_uevent_env
kobject: 'loop3' (000000003fc420f3): fill_kobj_path: path = '/devices/virtual/block/loop3'
R13: 0000000000000000 R14: ffffe8ffffc64df0 R15: ffffe8ffffc64e10
kobject: 'loop4' (0000000024837faf): kobject_uevent_env
kobject: 'loop4' (0000000024837faf): fill_kobj_path: path = '/devices/virtual/block/loop4'
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
kobject: 'loop2' (000000006d55b7ee): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop2' (000000006d55b7ee): fill_kobj_path: path = '/devices/virtual/block/loop2'
CR2: 00007f63ffbe5330 CR3: 000000009fb89000 CR4: 00000000001406e0
kobject: 'loop3' (000000003fc420f3): kobject_uevent_env