------------[ cut here ]------------ kernel BUG at ./include/linux/skbuff.h:1406! invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI Modules linked in: CPU: 0 PID: 20263 Comm: syz-executor.3 Not tainted 4.14.140+ #38 task: 000000009ee23ea3 task.stack: 0000000080f8bd11 RIP: 0010:skb_queue_prev include/linux/skbuff.h:1406 [inline] RIP: 0010:tcp_write_queue_prev include/net/tcp.h:1651 [inline] RIP: 0010:tcp_rtx_queue_tail include/net/tcp.h:1706 [inline] RIP: 0010:tcp_fragment+0x12c6/0x13e0 net/ipv4/tcp_output.c:1284 RSP: 0018:ffff8881d7607bf8 EFLAGS: 00010206 RAX: ffff888193952f00 RBX: ffff8881ce48bf00 RCX: 1ffff11039c91829 RDX: 0000000000000100 RSI: ffff8881a34eaa00 RDI: ffff8881a34eaa08 RBP: ffff8881a34eaa00 R08: 0000000001080020 R09: ffff88821ffff008 R10: ffff88821ffff017 R11: ffff88821ffff010 R12: 0000000000000000 R13: 0000000000004800 R14: 0000000001080020 R15: ffff8881ce48c150 FS: 00007fc5b9e00700(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002001d000 CR3: 00000001a20b8001 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: tcp_write_wakeup+0x32b/0x570 net/ipv4/tcp_output.c:3708 tcp_send_probe0+0x46/0x3cc net/ipv4/tcp_output.c:3736 tcp_probe_timer net/ipv4/tcp_timer.c:365 [inline] tcp_write_timer_handler+0x687/0x780 net/ipv4/tcp_timer.c:583 tcp_write_timer+0xc9/0x170 net/ipv4/tcp_timer.c:597 call_timer_fn+0x15b/0x6a0 kernel/time/timer.c:1279 expire_timers+0x227/0x4c0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1634 [inline] run_timer_softirq+0x1eb/0x5d0 kernel/time/timer.c:1647 __do_softirq+0x234/0x9ec kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x114/0x150 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x1a7/0x650 arch/x86/kernel/apic/apic.c:1064 apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x60 kernel/kcov.c:68 RSP: 0018:ffff88819757f630 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: ffff888193952f00 RBX: ffffffffa4efa220 RCX: 1ffffffff4a028e0 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88819395372c RBP: 00000000004596e7 R08: 0000000000000000 R09: 0000000000000002 R10: ffff888193953780 R11: c342fec6bac0f7e7 R12: 0000000000000000 R13: 00000000004596e7 R14: ffff888193952f00 R15: ffffffffa51ab0c0 rcu_read_lock include/linux/rcupdate.h:630 [inline] __is_insn_slot_addr+0x4c/0x1e0 kernel/kprobes.c:293 is_kprobe_insn_slot include/linux/kprobes.h:318 [inline] kernel_text_address+0xfe/0x120 kernel/extable.c:148 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:250 __save_stack_trace+0x8a/0xf0 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x164/0x210 mm/kasan/common.c:457 slab_free_hook mm/slub.c:1403 [inline] slab_free_freelist_hook mm/slub.c:1430 [inline] slab_free mm/slub.c:3005 [inline] kfree+0xfa/0x320 mm/slub.c:3942 skb_free_head+0x83/0xa0 net/core/skbuff.c:554 skb_release_data+0x4e5/0x770 net/core/skbuff.c:574 skb_release_all+0x46/0x60 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] consume_skb+0xdc/0x360 net/core/skbuff.c:705 netlink_broadcast_filtered+0x2c0/0xa00 net/netlink/af_netlink.c:1488 kobject_uevent_env+0x81f/0xc60 lib/kobject_uevent.c:495 loop_set_fd drivers/block/loop.c:938 [inline] lo_ioctl+0x10c8/0x1a30 drivers/block/loop.c:1407 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x8d0/0x1870 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1881 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4596e7 RSP: 002b:00007fc5b9dffa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00000000004596e7 RDX: 0000000000000006 RSI: 0000000000004c00 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000004c89d6 R14: 00000000004df8f8 R15: 00000000ffffffff Code: ea 03 80 3c 02 00 0f 85 2c 01 00 00 4c 8b bb 58 02 00 00 ba 00 00 00 00 4c 3b 7c 24 18 4c 0f 44 fa e9 bd fc ff ff e8 aa ed da fe <0f> 0b e8 c3 b0 fd fe e9 4d ef ff ff e8 b9 b0 fd fe e9 2d f2 ff RIP: skb_queue_prev include/linux/skbuff.h:1406 [inline] RSP: ffff8881d7607bf8 RIP: tcp_write_queue_prev include/net/tcp.h:1651 [inline] RSP: ffff8881d7607bf8 RIP: tcp_rtx_queue_tail include/net/tcp.h:1706 [inline] RSP: ffff8881d7607bf8 RIP: tcp_fragment+0x12c6/0x13e0 net/ipv4/tcp_output.c:1284 RSP: ffff8881d7607bf8 ---[ end trace 68d6e737a18b893b ]---