executing program syzkaller login: [ 15.969981] ------------[ cut here ]------------ [ 15.970525] WARNING: CPU: 2 PID: 2986 at ./include/net/sock.h:1507 strp_data_ready+0x2b7/0x390 [ 15.971618] Kernel panic - not syncing: panic_on_warn set ... [ 15.971618] [ 15.980087] CPU: 2 PID: 2986 Comm: syzkaller254006 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 15.980874] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 15.981989] Call Trace: [ 15.982249] [ 15.982460] dump_stack+0x194/0x257 [ 15.982806] ? arch_local_irq_restore+0x53/0x53 [ 15.983248] ? vsnprintf+0x1ed/0x1900 [ 15.983609] panic+0x1e4/0x41c [ 15.983911] ? refcount_error_report+0x214/0x214 [ 15.984352] ? show_regs_print_info+0x65/0x65 [ 15.990202] ? __warn+0x1a9/0x1e0 [ 15.990534] ? strp_data_ready+0x2b7/0x390 [ 15.990930] __warn+0x1c4/0x1e0 [ 15.991240] ? strp_data_ready+0x2b7/0x390 [ 15.991637] report_bug+0x211/0x2d0 [ 15.991984] fixup_bug+0x40/0x90 [ 15.992301] do_trap+0x260/0x390 [ 15.992626] do_error_trap+0x120/0x390 [ 15.992997] ? do_trap+0x390/0x390 [ 15.993330] ? strp_data_ready+0x2b7/0x390 [ 15.993724] ? tcp_rcv_state_process+0x335/0x4850 [ 15.998232] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 15.998679] do_invalid_op+0x1b/0x20 [ 15.999045] invalid_op+0x18/0x20 [ 15.999376] RIP: 0010:strp_data_ready+0x2b7/0x390 [ 15.999834] RSP: 0018:ffff88006de06b18 EFLAGS: 00010206 [ 16.000344] RAX: ffff88003dc4a6c0 RBX: ffff8800696b2c48 RCX: ffffffff847af437 [ 16.001028] RDX: 0000000000000100 RSI: ffff88006b0260a0 RDI: ffffffff85cc4be0 [ 16.001712] RBP: ffff88006de06b38 R08: 0000000000000004 R09: 1ffffffff0cddfc0 [ 16.006470] R10: ffff88006de06a00 R11: dffffc0000000000 R12: ffff88006b026000 [ 16.007149] R13: ffff8800696b2c50 R14: ffff88006b1b9512 R15: 0000000000000001 [ 16.007852] ? strp_data_ready+0x2b7/0x390 [ 16.008261] ? strp_data_ready+0x2b7/0x390 [ 16.008662] psock_data_ready+0x56/0x70 [ 16.009040] tcp_child_process+0x559/0x990 [ 16.009438] ? refcount_inc_not_zero+0x61/0x180 [ 16.009880] ? refcount_add_not_zero+0x1c3/0x200 [ 16.011346] ? tcp_timewait_state_process+0x1380/0x1380 [ 16.011853] ? tcp_filter+0x111/0x160 [ 16.012213] tcp_v4_rcv+0x1827/0x2f80 [ 16.012596] ? tcp_v4_early_demux+0xa30/0xa30 [ 16.013028] ip_local_deliver_finish+0x2e2/0xba0 [ 16.013478] ? inet_del_offload+0x40/0x40 [ 16.013872] ? nf_hook_slow+0xd3/0x1a0 [ 16.018701] ip_local_deliver+0x1ce/0x6e0 [ 16.019103] ? ip_call_ra_chain+0x6d0/0x6d0 [ 16.019518] ? check_noncircular+0x20/0x20 [ 16.019928] ? inet_del_offload+0x40/0x40 [ 16.020325] ? __local_bh_enable_ip+0x9d/0x160 [ 16.020762] ? ipt_do_table+0xd6f/0x1330 [ 16.021170] ip_rcv_finish+0x887/0x19a0 [ 16.021567] ? ip_local_deliver_finish+0xba0/0xba0 [ 16.023028] ? ip_rcv+0xf07/0x1820 [ 16.023370] ? lock_downgrade+0x990/0x990 [ 16.023764] ? nf_nat_ipv4_in+0x1cd/0x270 [ 16.024149] ? iptable_nat_ipv4_fn+0x40/0x40 [ 16.024570] ? nf_hook_slow+0xd3/0x1a0 [ 16.024946] ip_rcv+0xc3f/0x1820 [ 16.025270] ? ip_local_deliver+0x6e0/0x6e0 [ 16.025694] ? ip_local_deliver_finish+0xba0/0xba0 [ 16.028930] ? ip_local_deliver+0x6e0/0x6e0 [ 16.029345] __netif_receive_skb_core+0x1a3e/0x34b0 [ 16.029811] ? check_noncircular+0x20/0x20 [ 16.030224] ? nf_ingress+0x9f0/0x9f0 [ 16.030584] ? check_noncircular+0x20/0x20 [ 16.030979] ? update_curr+0x2e3/0xa60 [ 16.031341] ? __lock_acquire+0x6aa/0x3d50 [ 16.031743] ? __lock_is_held+0xb6/0x140 [ 16.032143] ? __lock_acquire+0x6aa/0x3d50 [ 16.032538] ? print_irqtrace_events+0x270/0x270 [ 16.032984] ? __enqueue_entity+0x109/0x1e0 [ 16.033398] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 16.033885] ? print_irqtrace_events+0x270/0x270 [ 16.034523] ? check_noncircular+0x20/0x20 [ 16.034921] ? print_irqtrace_events+0x270/0x270 [ 16.035370] ? check_preempt_wakeup+0x1320/0x1320 [ 16.035820] ? __lock_acquire+0x6aa/0x3d50 [ 16.036237] ? find_held_lock+0x35/0x1d0 [ 16.036626] ? lock_acquire+0x1d5/0x580 [ 16.036997] ? process_backlog+0x45f/0x740 [ 16.037391] ? lock_acquire+0x1d5/0x580 [ 16.037762] ? process_backlog+0x1ab/0x740 [ 16.038328] ? lock_release+0xa40/0xa40 [ 16.038700] ? __lock_acquire+0x6aa/0x3d50 [ 16.039107] __netif_receive_skb+0x2c/0x1b0 [ 16.039509] ? __netif_receive_skb+0x2c/0x1b0 [ 16.040750] process_backlog+0x203/0x740 [ 16.041131] ? mark_held_locks+0xaf/0x100 [ 16.041529] net_rx_action+0x792/0x1910 [ 16.041917] ? napi_complete_done+0x6c0/0x6c0 [ 16.042333] ? notifier_call_chain+0x136/0x2c0 [ 16.042759] ? lock_downgrade+0x990/0x990 [ 16.043155] ? check_noncircular+0x20/0x20 [ 16.043550] ? check_noncircular+0x20/0x20 [ 16.043956] ? pvclock_gtod_notify+0x2af/0x390 [ 16.044382] ? kvm_set_tsc_khz+0x460/0x460 [ 16.044784] ? find_held_lock+0x35/0x1d0 [ 16.045172] ? update_wall_time+0x5e6/0xe00 [ 16.045575] ? lock_downgrade+0x990/0x990 [ 16.045962] ? lock_downgrade+0x990/0x990 [ 16.046397] ? print_irqtrace_events+0x270/0x270 [ 16.046837] ? lock_release+0xa40/0xa40 [ 16.047210] ? memcpy+0x45/0x50 [ 16.047529] ? trace_hardirqs_off+0xd/0x10 [ 16.047922] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 16.048396] ? check_noncircular+0x20/0x20 [ 16.048798] ? read_boot_clock64+0x70/0x70 [ 16.049195] ? lock_downgrade+0x990/0x990 [ 16.049581] ? lock_downgrade+0x990/0x990 [ 16.050003] ? __lock_is_held+0xb6/0x140 [ 16.050405] __do_softirq+0x2d7/0xb85 [ 16.050773] ? __irqentry_text_end+0x4/0x4 [ 16.051166] ? irq_exit+0xbb/0x200 [ 16.051499] ? smp_call_function_interrupt+0x124/0x640 [ 16.051987] ? smp_reschedule_interrupt+0x670/0x670 [ 16.052480] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 16.052939] do_softirq_own_stack+0x2a/0x40 [ 16.053339] [ 16.053553] do_softirq.part.22+0x14d/0x190 [ 16.053955] ? ip_finish_output2+0x87a/0x1460 [ 16.054413] __local_bh_enable_ip+0x135/0x160 [ 16.054833] ip_finish_output2+0x8ad/0x1460 [ 16.055244] ? dst_output+0x140/0x140 [ 16.055598] ? check_noncircular+0x20/0x20 [ 16.055993] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.056457] ? ipt_do_table+0xd04/0x1330 [ 16.056835] ? trace_hardirqs_on+0xd/0x10 [ 16.057223] ? __local_bh_enable_ip+0x9d/0x160 [ 16.057654] ? ipt_do_table+0xd6f/0x1330 [ 16.058084] ? trace_hardirqs_on+0xd/0x10 [ 16.058477] ? ipv4_mtu+0x28c/0x3d0 [ 16.058825] ? rt_cpu_seq_show+0x2c0/0x2c0 [ 16.059231] ? __lock_is_held+0xb6/0x140 [ 16.059632] ip_finish_output+0x85e/0xd10 [ 16.060024] ? ip_finish_output+0x85e/0xd10 [ 16.060438] ? ip_fragment.constprop.50+0x200/0x200 [ 16.060911] ? iptable_mangle_hook+0xa9/0x550 [ 16.061373] ? nf_hook_slow+0xd3/0x1a0 [ 16.061762] ip_output+0x1cc/0x860 [ 16.062808] ? ip_mc_output+0x1350/0x1350 [ 16.063282] ? ip_fragment.constprop.50+0x200/0x200 [ 16.063851] ip_local_out+0x95/0x160 [ 16.064271] ip_queue_xmit+0x8c6/0x18e0 [ 16.064711] ? tcp_rcv_state_process+0x4646/0x4850 [ 16.065264] ? ip_build_and_send_pkt+0xc30/0xc30 [ 16.065794] ? refcount_dec_if_one+0x20/0x20 [ 16.069449] ? __tcp_v4_send_check+0x1b8/0x350 [ 16.069940] ? tcp_options_write+0x228/0x940 [ 16.070428] tcp_transmit_skb+0x1ab7/0x3840 [ 16.073277] ? __tcp_select_window+0x8d0/0x8d0 [ 16.073775] ? kasan_kmalloc+0xad/0xe0 [ 16.074205] ? __kmalloc_node_track_caller+0x47/0x70 [ 16.074756] ? memset+0x31/0x40 [ 16.075114] ? __alloc_skb+0x57e/0x780 [ 16.075538] ? skb_copy_and_csum_dev+0x360/0x360 [ 16.076071] ? sock_def_wakeup+0x222/0x350 [ 16.076548] tcp_send_ack.part.37+0x3bb/0x650 [ 16.077040] tcp_send_ack+0x49/0x60 [ 16.077434] tcp_rcv_state_process+0x4646/0x4850 [ 16.077957] ? tcp_finish_connect+0x410/0x410 [ 16.082503] ? __release_sock+0xca/0x360 [ 16.082946] ? lock_downgrade+0x990/0x990 [ 16.083407] ? mark_held_locks+0xaf/0x100 [ 16.083855] ? __local_bh_enable_ip+0x9d/0x160 [ 16.084360] tcp_v4_do_rcv+0x55c/0x7d0 [ 16.084763] ? tcp_v4_do_rcv+0x55c/0x7d0 [ 16.086514] __release_sock+0x124/0x360 [ 16.086961] release_sock+0xa4/0x2a0 [ 16.087368] ? __release_sock+0x360/0x360 [ 16.087819] ? find_held_lock+0x35/0x1d0 [ 16.088265] __inet_stream_connect+0x651/0xf00 [ 16.088769] ? inet_bind+0x910/0x910 [ 16.089178] ? mark_held_locks+0xaf/0x100 [ 16.089624] ? __local_bh_enable_ip+0x9d/0x160 [ 16.091082] ? __init_waitqueue_head+0x140/0x140 [ 16.091594] ? trace_hardirqs_on+0xd/0x10 [ 16.092038] ? __local_bh_enable_ip+0x9d/0x160 [ 16.092538] inet_stream_connect+0x58/0xa0 [ 16.093730] SYSC_connect+0x204/0x470 [ 16.094171] ? SYSC_bind+0x3f0/0x3f0 [ 16.094559] ? ioctl_preallocate+0x2b0/0x2b0 [ 16.095040] ? selinux_capable+0x40/0x40 [ 16.095509] ? __fd_install+0x69b/0x6a0 [ 16.095958] ? sock_map_fd+0x53/0x70 [ 16.096383] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 16.096935] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.097514] SyS_connect+0x24/0x30 [ 16.097920] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 16.098739] RIP: 0033:0x435119 [ 16.099086] RSP: 002b:00007ffc55dca6b8 EFLAGS: 00000217 ORIG_RAX: 000000000000002a [ 16.099914] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000435119 [ 16.100691] RDX: 0000000000000010 RSI: 00000000200d1ff0 RDI: 0000000000000004 [ 16.101468] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 [ 16.106315] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 16.106989] R13: 0000000000401a90 R14: 0000000000401b20 R15: 0000000000000000 [ 16.108905] Dumping ftrace buffer: [ 16.109332] (ftrace buffer empty) [ 16.109680] Kernel Offset: disabled [ 16.110075] Rebooting in 86400 seconds..