audit: type=1400 audit(1567498066.064:9): avc: denied { map } for pid=1771 comm="syz-execprog" path="/root/syzkaller-shm957544127" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 ------------[ cut here ]------------ kernel BUG at ./include/linux/skbuff.h:1406! invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.141+ #40 task: (ptrval) task.stack: (ptrval) 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:ffff8881db907bf8 EFLAGS: 00010206 RAX: ffff8881daa72f00 RBX: ffff8881d34b1500 RCX: 1ffff1103a6962e9 RDX: 0000000000000100 RSI: ffff8881cad4d400 RDI: ffff8881cad4d408 RBP: ffff8881cad4d400 R08: 0000000001080020 R09: ffff88821ffff048 R10: ffff88821ffff057 R11: ffff88821ffff050 R12: 0000000000000000 R13: 0000000000006800 R14: 0000000001080020 R15: ffff8881d34b1750 FS: 0000000000000000(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000075c000 CR3: 00000001d0826003 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:1102 apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:native_safe_halt+0x13/0x20 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffff8881daa8fd60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffffffffb162eba8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881daa7372c RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881daa72f00 R15: dffffc0000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x61/0x3b0 arch/x86/kernel/process.c:566 cpuidle_idle_call kernel/sched/idle.c:159 [inline] do_idle+0x2e6/0x390 kernel/sched/idle.c:268 cpu_startup_entry+0xc6/0xd0 kernel/sched/idle.c:374 start_secondary+0x3a8/0x4b0 arch/x86/kernel/smpboot.c:272 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 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 4a d0 da fe <0f> 0b e8 c3 98 fd fe e9 4d ef ff ff e8 b9 98 fd fe e9 2d f2 ff RIP: skb_queue_prev include/linux/skbuff.h:1406 [inline] RSP: ffff8881db907bf8 RIP: tcp_write_queue_prev include/net/tcp.h:1651 [inline] RSP: ffff8881db907bf8 RIP: tcp_rtx_queue_tail include/net/tcp.h:1706 [inline] RSP: ffff8881db907bf8 RIP: tcp_fragment+0x12c6/0x13e0 net/ipv4/tcp_output.c:1284 RSP: ffff8881db907bf8 ---[ end trace 3884a2eb18d775f5 ]---