[[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 '10.128.10.14' (ECDSA) to the list of known hosts.
2020/04/16 15:17:28 fuzzer started
2020/04/16 15:17:30 dialing manager at 10.128.0.105:38905
2020/04/16 15:17:31 syscalls: 2960
2020/04/16 15:17:31 code coverage: enabled
2020/04/16 15:17:31 comparison tracing: enabled
2020/04/16 15:17:31 extra coverage: enabled
2020/04/16 15:17:31 setuid sandbox: enabled
2020/04/16 15:17:31 namespace sandbox: enabled
2020/04/16 15:17:31 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/16 15:17:31 fault injection: enabled
2020/04/16 15:17:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/16 15:17:31 net packet injection: enabled
2020/04/16 15:17:31 net device setup: enabled
2020/04/16 15:17:31 concurrency sanitizer: enabled
2020/04/16 15:17:31 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/16 15:17:31 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [ 49.890413][ T6727] KCSAN: could not find function: 'poll_schedule_timeout'
2020/04/16 15:17:36 adding functions to KCSAN blacklist: '__snd_rawmidi_transmit_ack' 'ext4_free_inodes_count' 'tick_nohz_next_event' 'shmem_getpage_gfp' 'tick_nohz_idle_stop_tick' 'ktime_get_real_seconds' 'ep_poll' 'find_get_pages_range_tag' 'echo_char' 'ext4_mb_good_group' 'dd_has_work' 'tick_sched_do_timer' '__dev_queue_xmit' 'io_sq_thread' '__ext4_new_inode' 'generic_write_end' 'get_signal' 'audit_log_start' 'generic_fillattr' 'ext4_sync_file' 'page_counter_charge' 'ext4_mark_iloc_dirty' '__process_echoes' 'kauditd_thread' '__find_get_block' '__mark_inode_dirty' 'poll_schedule_timeout' 'do_syslog' 'add_timer' 'do_nanosleep' 'commit_echoes' 'ext4_ext_try_to_merge_right' 'n_tty_receive_buf_common' '__x64_sys_ptrace' 'blk_mq_dispatch_rq_list' 'xas_find_marked' 'xas_clear_mark' 'pcpu_alloc' 'copy_process' 'mod_timer' 'blk_mq_sched_dispatch_requests' 'wbt_done' 'run_timer_softirq' '_find_next_bit'
[ 52.218619][ T6727] KCSAN: could not find function: '_find_next_bit'
[ 110.038322][ C1] ==================================================================
[ 110.046471][ C1] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 110.054869][ C1]
[ 110.057209][ C1] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0:
[ 110.064556][ C1] timer_clear_idle+0x3d/0x50
[ 110.069211][ C1] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 110.075085][ C1] tick_nohz_idle_exit+0x19c/0x1d0
[ 110.080170][ C1] do_idle+0xac/0x290
[ 110.084128][ C1] cpu_startup_entry+0x14/0x20
[ 110.088872][ C1] rest_init+0xe4/0xeb
[ 110.092923][ C1] arch_call_rest_init+0x13/0x2b
[ 110.097844][ C1] start_kernel+0x82d/0x852
[ 110.102337][ C1] secondary_startup_64+0xa4/0xb0
[ 110.107340][ C1]
[ 110.109645][ C1] read to 0xffff88812c01dca4 of 1 bytes by interrupt on cpu 1:
[ 110.117170][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 110.122701][ C1] mod_timer+0x50e/0x830
[ 110.126931][ C1] sk_reset_timer+0x29/0xc0
[ 110.131432][ C1] tcp_send_delayed_ack+0x1fd/0x280
[ 110.136625][ C1] __tcp_ack_snd_check+0x3bb/0x550
[ 110.141726][ C1] tcp_rcv_established+0x72b/0xee0
[ 110.146825][ C1] tcp_v4_do_rcv+0x396/0x4f0
[ 110.151390][ C1] tcp_v4_rcv+0x1c55/0x1e10
[ 110.155875][ C1] ip_protocol_deliver_rcu+0x4b/0x410
[ 110.161224][ C1] ip_local_deliver_finish+0xf3/0x120
[ 110.166574][ C1] ip_local_deliver+0x135/0x220
[ 110.171401][ C1] ip_sublist_rcv_finish+0xf0/0x140
[ 110.176577][ C1] ip_sublist_rcv+0x3f8/0x530
[ 110.181231][ C1] ip_list_rcv+0x2f3/0x321
[ 110.185626][ C1] __netif_receive_skb_list_core+0x368/0x5c0
[ 110.191597][ C1] netif_receive_skb_list_internal+0x5c7/0x810
[ 110.197738][ C1] gro_normal_list.part.0+0x37/0xa0
[ 110.202917][ C1] napi_complete_done+0x1d3/0x3a0
[ 110.207924][ C1] virtqueue_napi_complete+0x36/0xa0
[ 110.213189][ C1] virtnet_poll+0x771/0x790
[ 110.217699][ C1] net_rx_action+0x3ad/0xac0
[ 110.222280][ C1] __do_softirq+0x118/0x34a
[ 110.226785][ C1] irq_exit+0xb5/0xd0
[ 110.230751][ C1] do_IRQ+0x7b/0x120
[ 110.234624][ C1] ret_from_intr+0x0/0x21
[ 110.238930][ C1] native_safe_halt+0xe/0x10
[ 110.243502][ C1] default_idle+0x21/0x170
[ 110.247894][ C1] do_idle+0x1b7/0x290
[ 110.251947][ C1] cpu_startup_entry+0x14/0x20
[ 110.256705][ C1] start_secondary+0x169/0x1b0
[ 110.261545][ C1] secondary_startup_64+0xa4/0xb0
[ 110.266546][ C1]
[ 110.268851][ C1] Reported by Kernel Concurrency Sanitizer on:
[ 110.274998][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[ 110.282868][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 110.292904][ C1] ==================================================================
[ 110.300940][ C1] Kernel panic - not syncing: panic_on_warn set ...
[ 110.307505][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[ 110.315370][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 110.325398][ C1] Call Trace:
[ 110.328659][ C1]
[ 110.331507][ C1] dump_stack+0x11d/0x187
[ 110.335829][ C1] panic+0x210/0x640
[ 110.339702][ C1] ? vprintk_func+0x89/0x13a
[ 110.344275][ C1] kcsan_report.cold+0xc/0x1a
[ 110.348945][ C1] kcsan_setup_watchpoint+0x3fb/0x440
[ 110.354305][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 110.359843][ C1] mod_timer+0x50e/0x830
[ 110.364084][ C1] sk_reset_timer+0x29/0xc0
[ 110.368568][ C1] tcp_send_delayed_ack+0x1fd/0x280
[ 110.373744][ C1] __tcp_ack_snd_check+0x3bb/0x550
[ 110.378834][ C1] ? constant_test_bit+0xd/0x30
[ 110.383679][ C1] tcp_rcv_established+0x72b/0xee0
[ 110.388772][ C1] tcp_v4_do_rcv+0x396/0x4f0
[ 110.393341][ C1] tcp_v4_rcv+0x1c55/0x1e10
[ 110.397851][ C1] ip_protocol_deliver_rcu+0x4b/0x410
[ 110.403204][ C1] ip_local_deliver_finish+0xf3/0x120
[ 110.408553][ C1] ip_local_deliver+0x135/0x220
[ 110.413391][ C1] ? ip_protocol_deliver_rcu+0x410/0x410
[ 110.419018][ C1] ip_sublist_rcv_finish+0xf0/0x140
[ 110.424207][ C1] ip_sublist_rcv+0x3f8/0x530
[ 110.428872][ C1] ? ip_sublist_rcv+0x530/0x530
[ 110.433709][ C1] ip_list_rcv+0x2f3/0x321
[ 110.438110][ C1] ? ip_rcv+0x1b0/0x1b0
[ 110.442257][ C1] __netif_receive_skb_list_core+0x368/0x5c0
[ 110.448264][ C1] ? gro_normal_one+0x120/0x160
[ 110.453101][ C1] netif_receive_skb_list_internal+0x5c7/0x810
[ 110.459233][ C1] ? receive_buf+0x261/0x2ed0
[ 110.463893][ C1] gro_normal_list.part.0+0x37/0xa0
[ 110.469110][ C1] napi_complete_done+0x1d3/0x3a0
[ 110.474117][ C1] ? virtqueue_enable_cb_prepare+0x19b/0x2a0
[ 110.480078][ C1] virtqueue_napi_complete+0x36/0xa0
[ 110.485344][ C1] virtnet_poll+0x771/0x790
[ 110.489846][ C1] net_rx_action+0x3ad/0xac0
[ 110.494427][ C1] __do_softirq+0x118/0x34a
[ 110.498951][ C1] irq_exit+0xb5/0xd0
[ 110.502953][ C1] do_IRQ+0x7b/0x120
[ 110.506832][ C1] common_interrupt+0xf/0xf
[ 110.511309][ C1]
[ 110.514270][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 110.519626][ C1] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 1c be 57 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 0c be 57 00 fb f4 cc 41 54 55 53 e8 97 f1 8e fc e8 b2 58 ab fd 0f 1f 44 00 00 48
[ 110.539215][ C1] RSP: 0018:ffffc90000cd3eb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffde
[ 110.547610][ C1] RAX: 0000000000000001 RBX: ffff88812b78b040 RCX: ffffffff82561ff1
[ 110.555564][ C1] RDX: 0000000000000000 RSI: ffffffff82561ffa RDI: 0000000000000005
[ 110.563563][ C1] RBP: 0000000000000001 R08: ffff88812b78b040 R09: 0000ffff85a6c928
[ 110.571526][ C1] R10: 0000c90000cd3e98 R11: 0000ffff85a6c92f R12: ffff88812b78b040
[ 110.579490][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88812b78b040
[ 110.587460][ C1] ? debug_smp_processor_id+0x31/0x129
[ 110.592919][ C1] ? debug_smp_processor_id+0x3a/0x129
[ 110.598398][ C1] default_idle+0x21/0x170
[ 110.602807][ C1] do_idle+0x1b7/0x290
[ 110.606923][ C1] cpu_startup_entry+0x14/0x20
[ 110.611680][ C1] start_secondary+0x169/0x1b0
[ 110.616586][ C1] secondary_startup_64+0xa4/0xb0
[ 110.622779][ C1] Kernel Offset: disabled
[ 110.627106][ C1] Rebooting in 86400 seconds..