------------[ cut here ]------------ kernel BUG at ./include/linux/skbuff.h:1406! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 51 Comm: kworker/u4:2 Not tainted 4.14.138 #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net task: ffff8880a9f9a5c0 task.stack: ffff8880a9fa8000 RIP: 0010:skb_queue_prev include/linux/skbuff.h:1406 [inline] RIP: 0010:tcp_write_queue_prev include/net/tcp.h:1650 [inline] RIP: 0010:tcp_write_queue_prev include/net/tcp.h:1647 [inline] RIP: 0010:tcp_rtx_queue_tail include/net/tcp.h:1705 [inline] RIP: 0010:tcp_fragment+0x12a7/0x13e0 net/ipv4/tcp_output.c:1284 RSP: 0018:ffff8880aef07c00 EFLAGS: 00010206 RAX: ffff8880a9f9a5c0 RBX: ffff888085ec15c0 RCX: 1ffff1100aa22449 RDX: 0000000000000100 RSI: ffff888085ec15c0 RDI: ffff888085ec15c8 RBP: ffff8880aef07c58 R08: 0000000001080020 R09: ffff888085ec15e8 R10: ffff88821fff8050 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000006880 R14: ffff888055112250 R15: 0000000001080020 FS: 0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000025093a8 CR3: 000000005d65c000 CR4: 00000000001406e0 Call Trace: tcp_write_wakeup+0x34c/0x5b0 net/ipv4/tcp_output.c:3708 tcp_send_probe0+0x4b/0x3fe net/ipv4/tcp_output.c:3736 tcp_probe_timer net/ipv4/tcp_timer.c:365 [inline] tcp_write_timer_handler+0x6da/0x7e0 net/ipv4/tcp_timer.c:583 tcp_write_timer+0xd8/0x180 net/ipv4/tcp_timer.c:597 kobject: 'loop3' (ffff8880a4a969a0): kobject_uevent_env call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 kobject: 'loop3' (ffff8880a4a969a0): fill_kobj_path: path = '/devices/virtual/block/loop3' expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1634 [inline] __run_timers kernel/time/timer.c:1602 [inline] run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1064 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:inet_twsk_purge+0x274/0x4e0 net/ipv4/inet_timewait_sock.c:271 RSP: 0018:ffff8880a9fafba0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: ffffed10136521df RBX: 00000000000a43bd RCX: 1ffffffff0ea63a5 RDX: 0000000000000000 RSI: ffffffff869d2b40 RDI: ffff8880aef2394c RBP: ffff8880a9fafc00 R08: 0000000000000000 R09: ffff8880a9f9aed8 R10: ffff8880a9f9aeb8 R11: ffff8880a9f9a5c0 R12: 00000000000521de R13: ffff88808b6d4d80 R14: ffff88805d768140 R15: dffffc0000000000 dccp_v4_exit_batch+0x1a/0x20 net/dccp/ipv4.c:1030 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:145 cleanup_net+0x3ba/0x880 net/core/net_namespace.c:484 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 3c 02 00 0f 85 4f 01 00 00 48 8b 45 d0 ba 00 00 00 00 4c 8b b0 58 02 00 00 4c 3b 75 c0 4c 0f 44 f2 e9 e6 fc ff ff e8 b9 82 35 fc <0f> 0b e8 d2 2f 5f fc e9 31 fa ff ff 48 89 df e8 25 2f 5f fc e9 RIP: skb_queue_prev include/linux/skbuff.h:1406 [inline] RSP: ffff8880aef07c00 RIP: tcp_write_queue_prev include/net/tcp.h:1650 [inline] RSP: ffff8880aef07c00 RIP: tcp_write_queue_prev include/net/tcp.h:1647 [inline] RSP: ffff8880aef07c00 RIP: tcp_rtx_queue_tail include/net/tcp.h:1705 [inline] RSP: ffff8880aef07c00 RIP: tcp_fragment+0x12a7/0x13e0 net/ipv4/tcp_output.c:1284 RSP: ffff8880aef07c00 ---[ end trace ceebecba110afab8 ]---