[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.96' (ECDSA) to the list of known hosts.
2020/05/12 11:15:23 fuzzer started
2020/05/12 11:15:23 dialing manager at 10.128.0.105:36533
2020/05/12 11:15:23 syscalls: 3055
2020/05/12 11:15:23 code coverage: enabled
2020/05/12 11:15:23 comparison tracing: enabled
2020/05/12 11:15:23 extra coverage: enabled
2020/05/12 11:15:23 setuid sandbox: enabled
2020/05/12 11:15:23 namespace sandbox: enabled
2020/05/12 11:15:23 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/12 11:15:23 fault injection: enabled
2020/05/12 11:15:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/12 11:15:23 net packet injection: enabled
2020/05/12 11:15:23 net device setup: enabled
2020/05/12 11:15:23 concurrency sanitizer: enabled
2020/05/12 11:15:23 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/12 11:15:23 USB emulation: enabled
syzkaller login: [ 55.094085][ T8920] KCSAN: could not find function: '_find_next_bit'
[ 56.177806][ T8920] KCSAN: could not find function: 'poll_schedule_timeout'
2020/05/12 11:15:29 adding functions to KCSAN blacklist: 'ext4_mark_iloc_dirty' 'tick_sched_do_timer' 'ep_poll' 'generic_fillattr' 'wbt_done' 'find_get_pages_range_tag' '__mark_inode_dirty' '__put_unused_fd' 'add_timer' 'schedule_hrtimeout_range_clock' 'handle_edge_irq' 'ktime_get_real_seconds' '_find_next_bit' 'xas_clear_mark' 'echo_char' 'alloc_pid' '__delete_from_page_cache' 'poll_schedule_timeout' 'run_timer_softirq' 'xas_find_marked' 'other_inode_match' 'ext4_free_inodes_count' 'do_signal_stop' 'wg_packet_send_staged_packets' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'do_nanosleep' 'wbt_wait' 'tick_nohz_idle_stop_tick' '__snd_rawmidi_transmit_ack' 'blk_mq_get_request' 'n_tty_receive_buf_common' 'mod_timer' 'shmem_file_read_iter' 'page_counter_charge' 'copy_process'
[ 194.557943][ C1] ==================================================================
[ 194.566077][ C1] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 194.574465][ C1]
[ 194.576786][ C1] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0:
[ 194.584145][ C1] timer_clear_idle+0x3d/0x50
[ 194.588806][ C1] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 194.594947][ C1] tick_nohz_idle_exit+0x19c/0x1d0
[ 194.600041][ C1] do_idle+0xac/0x290
[ 194.604109][ C1] cpu_startup_entry+0x14/0x20
[ 194.608861][ C1] rest_init+0xe4/0xeb
[ 194.613534][ C1] arch_call_rest_init+0x13/0x2b
[ 194.618480][ C1] start_kernel+0x7fe/0x823
[ 194.622977][ C1] secondary_startup_64+0xa4/0xb0
[ 194.627982][ C1]
[ 194.630313][ C1] read to 0xffff88812c01dca4 of 1 bytes by interrupt on cpu 1:
[ 194.637842][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 194.643375][ C1] mod_timer+0x50e/0x830
[ 194.647607][ C1] sk_reset_timer+0x29/0xc0
[ 194.652099][ C1] tcp_send_delayed_ack+0x1fd/0x280
[ 194.657277][ C1] __tcp_ack_snd_check+0x3bb/0x550
[ 194.662395][ C1] tcp_rcv_established+0x72b/0xee0
[ 194.667507][ C1] tcp_v4_do_rcv+0x396/0x4f0
[ 194.672097][ C1] tcp_v4_rcv+0x1c55/0x1e10
[ 194.676586][ C1] ip_protocol_deliver_rcu+0x4b/0x410
[ 194.681964][ C1] ip_local_deliver_finish+0xf3/0x120
[ 194.687323][ C1] ip_local_deliver+0x135/0x220
[ 194.692772][ C1] ip_sublist_rcv_finish+0xf0/0x140
[ 194.697959][ C1] ip_sublist_rcv+0x3f8/0x530
[ 194.702621][ C1] ip_list_rcv+0x2f3/0x321
[ 194.707035][ C1] __netif_receive_skb_list_core+0x368/0x5c0
[ 194.713236][ C1] netif_receive_skb_list_internal+0x5c7/0x810
[ 194.719390][ C1] gro_normal_list.part.0+0x37/0xa0
[ 194.724572][ C1] gro_normal_one+0x14c/0x160
[ 194.729229][ C1] napi_gro_receive+0x27d/0x2f0
[ 194.734066][ C1] receive_buf+0x24c/0x3420
[ 194.746919][ C1] virtnet_poll+0x343/0x790
[ 194.751403][ C1] net_rx_action+0x3ad/0xac0
[ 194.755973][ C1] __do_softirq+0x118/0x34a
[ 194.760453][ C1] irq_exit+0xb5/0xd0
[ 194.764414][ C1] do_IRQ+0x7b/0x120
[ 194.768297][ C1] ret_from_intr+0x0/0x21
[ 194.772612][ C1] native_safe_halt+0xe/0x10
[ 194.777200][ C1] default_idle+0x21/0x170
[ 194.781608][ C1] do_idle+0x1b7/0x290
[ 194.785659][ C1] cpu_startup_entry+0x14/0x20
[ 194.790417][ C1] start_secondary+0x169/0x1b0
[ 194.795163][ C1] secondary_startup_64+0xa4/0xb0
[ 194.800173][ C1]
[ 194.802487][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 194.808637][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[ 194.816539][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 194.826717][ C1] ==================================================================
[ 194.834762][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 194.841442][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[ 194.849312][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 194.859347][ C1] Call Trace:
[ 194.862620][ C1]
[ 194.865471][ C1] dump_stack+0x11d/0x187
[ 194.869797][ C1] panic+0x210/0x640
[ 194.873715][ C1] ? vprintk_func+0x89/0x13a
[ 194.878294][ C1] kcsan_report.cold+0xc/0x1a
[ 194.882998][ C1] kcsan_setup_watchpoint+0x3fb/0x440
[ 194.888378][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 194.893965][ C1] mod_timer+0x50e/0x830
[ 194.898215][ C1] sk_reset_timer+0x29/0xc0
[ 194.902719][ C1] tcp_send_delayed_ack+0x1fd/0x280
[ 194.907917][ C1] __tcp_ack_snd_check+0x3bb/0x550
[ 194.913030][ C1] ? constant_test_bit+0xd/0x30
[ 194.917886][ C1] tcp_rcv_established+0x72b/0xee0
[ 194.923002][ C1] tcp_v4_do_rcv+0x396/0x4f0
[ 194.927606][ C1] tcp_v4_rcv+0x1c55/0x1e10
[ 194.932115][ C1] ip_protocol_deliver_rcu+0x4b/0x410
[ 194.937480][ C1] ip_local_deliver_finish+0xf3/0x120
[ 194.942866][ C1] ip_local_deliver+0x135/0x220
[ 194.947721][ C1] ? ip_protocol_deliver_rcu+0x410/0x410
[ 194.953375][ C1] ip_sublist_rcv_finish+0xf0/0x140
[ 194.958568][ C1] ip_sublist_rcv+0x3f8/0x530
[ 194.963241][ C1] ? ip_sublist_rcv+0x530/0x530
[ 194.968085][ C1] ip_list_rcv+0x2f3/0x321
[ 194.972493][ C1] ? ip_rcv+0x1b0/0x1b0
[ 194.976642][ C1] __netif_receive_skb_list_core+0x368/0x5c0
[ 194.982641][ C1] netif_receive_skb_list_internal+0x5c7/0x810
[ 194.988801][ C1] gro_normal_list.part.0+0x37/0xa0
[ 194.993992][ C1] ? __write_once_size+0x7c/0x100
[ 194.999002][ C1] gro_normal_one+0x14c/0x160
[ 195.003664][ C1] napi_gro_receive+0x27d/0x2f0
[ 195.008514][ C1] receive_buf+0x24c/0x3420
[ 195.013024][ C1] ? virtqueue_get_buf_ctx+0x4db/0x5c0
[ 195.018487][ C1] virtnet_poll+0x343/0x790
[ 195.022984][ C1] ? rcu_dynticks_curr_cpu_in_eqs+0x70/0xa0
[ 195.028875][ C1] net_rx_action+0x3ad/0xac0
[ 195.033465][ C1] __do_softirq+0x118/0x34a
[ 195.038024][ C1] irq_exit+0xb5/0xd0
[ 195.042028][ C1] do_IRQ+0x7b/0x120
[ 195.045930][ C1] common_interrupt+0xf/0xf
[ 195.050407][ C1]
[ 195.053346][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 195.058709][ C1] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 0c d6 58 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d fc d5 58 00 fb f4 cc 41 54 55 53 e8 97 b2 71 fb e8 a2 21 bc fc 0f 1f 44 00 00 48
[ 195.078337][ C1] RSP: 0018:ffffc90000cd3eb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffde
[ 195.086735][ C1] RAX: 0000000000000001 RBX: ffff88812b797040 RCX: ffffffff8285fdf1
[ 195.094692][ C1] RDX: 0000000000000000 RSI: ffffffff8285fdfa RDI: 0000000000000005
[ 195.102656][ C1] RBP: 0000000000000001 R08: ffff88812b797040 R09: 0000ffff87047928
[ 195.110707][ C1] R10: 0000c90000cd3e98 R11: 0000ffff8704792f R12: ffff88812b797040
[ 195.118660][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88812b797040
[ 195.126643][ C1] ? debug_smp_processor_id+0x31/0x129
[ 195.132083][ C1] ? debug_smp_processor_id+0x3a/0x129
[ 195.137527][ C1] default_idle+0x21/0x170
[ 195.141948][ C1] do_idle+0x1b7/0x290
[ 195.145997][ C1] ? debug_smp_processor_id+0x3a/0x129
[ 195.151458][ C1] cpu_startup_entry+0x14/0x20
[ 195.156216][ C1] start_secondary+0x169/0x1b0
[ 195.160959][ C1] secondary_startup_64+0xa4/0xb0
[ 195.167134][ C1] Kernel Offset: disabled
[ 195.171460][ C1] Rebooting in 86400 seconds..