general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.0.0-rc5+ #55 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:1946 [inline] RIP: 0010:__skb_queue_purge include/linux/skbuff.h:2660 [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:ffff8880a99c79a8 EFLAGS: 00010a03 RAX: ffffffffffffe8ff RBX: ffffe8ffffc6b9c0 RCX: 1ff8d7b61ffffd20 kobject: 'loop4' (0000000040dfdde2): kobject_uevent_env RDX: ffc6bdb0ffffe8ff RSI: ffffffff8583115a RDI: ffc6bdb0ffffe907 RBP: ffff8880a99c7a08 R08: ffff8880a99ba580 R09: fffffbfff12634b5 R10: fffffbfff12634b4 R11: ffffffff8931a5a3 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffe8ffffc6b9d0 R15: ffffe8ffffc6b9c4 kobject: 'loop4' (0000000040dfdde2): fill_kobj_path: path = '/devices/virtual/block/loop4' FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000607304 CR3: 0000000090350000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ------------[ cut here ]------------ downgrading a read lock WARNING: CPU: 0 PID: 14292 at kernel/locking/lockdep.c:3553 __lock_downgrade kernel/locking/lockdep.c:3553 [inline] WARNING: CPU: 0 PID: 14292 at kernel/locking/lockdep.c:3553 lock_downgrade+0x478/0x810 kernel/locking/lockdep.c:3816 Kernel panic - not syncing: panic_on_warn set ... ip_tunnel_dev_free+0x19/0x60 net/ipv4/ip_tunnel.c:994 netdev_run_todo+0x51c/0x7d0 net/core/dev.c:8951 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:116 ip_tunnel_delete_nets+0x423/0x5f0 net/ipv4/ip_tunnel.c:1108 erspan_exit_batch_net+0x23/0x30 net/ipv4/ip_gre.c:1594 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: Kernel Offset: disabled Rebooting in 86400 seconds..