[[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2.
[ 43.797872][ T27] audit: type=1800 audit(1584883705.157:21): pid=7569 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[ 43.848493][ T27] audit: type=1800 audit(1584883705.157:22): pid=7569 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.1.34' (ECDSA) to the list of known hosts.
2020/03/22 13:28:36 fuzzer started
2020/03/22 13:28:37 dialing manager at 10.128.0.105:34421
2020/03/22 13:28:37 syscalls: 2955
2020/03/22 13:28:37 code coverage: enabled
2020/03/22 13:28:37 comparison tracing: enabled
2020/03/22 13:28:37 extra coverage: enabled
2020/03/22 13:28:37 setuid sandbox: enabled
2020/03/22 13:28:37 namespace sandbox: enabled
2020/03/22 13:28:37 Android sandbox: /sys/fs/selinux/policy does not exist
2020/03/22 13:28:37 fault injection: enabled
2020/03/22 13:28:37 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/03/22 13:28:37 net packet injection: enabled
2020/03/22 13:28:37 net device setup: enabled
2020/03/22 13:28:37 concurrency sanitizer: enabled
2020/03/22 13:28:37 devlink PCI setup: PCI device 0000:00:10.0 is not available
syzkaller login: [ 60.621885][ T7738] KCSAN: could not find function: 'poll_schedule_timeout'
[ 61.933917][ T7738] KCSAN: could not find function: '_find_next_bit'
2020/03/22 13:28:44 adding functions to KCSAN blacklist: 'xas_clear_mark' 'generic_fillattr' 'lruvec_lru_size' 'shmem_file_read_iter' 'echo_char' 'ext4_mb_good_group' 'copyout' 'wbt_inflight_cb' 'ext4_set_iomap' 'n_tty_receive_buf_common' 'dec_zone_page_state' 'xas_find_marked' 'add_timer' 'ext4_has_free_clusters' 'pipe_double_lock' '__process_echoes' 'ext4_mark_iloc_dirty' '__mark_inode_dirty' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'atime_needs_update' 'futex_wait_queue_me' 'dd_has_work' 'ktime_get_real_seconds' 'mod_timer' 'wbt_issue' 'commit_echoes' 'get_cpu_iowait_time_us' 'tick_sched_do_timer' 'poll_schedule_timeout' 'kauditd_thread' 'list_lru_count_one' 'page_counter_try_charge' 'ext4_nonda_switch' 'snd_seq_prioq_cell_out' '__remove_assoc_queue' 'tick_nohz_idle_stop_tick' 'do_signal_stop' 'do_syslog' 'pcpu_alloc' 'generic_write_end' '_find_next_bit' 'copy_process' 'page_counter_charge' 'audit_log_start' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'shmem_getpage_gfp' 'ext4_write_end' 'ext4_writepages' '__find_get_block' 'find_get_pages_range_tag' 'ep_poll' 'blk_mq_get_request' 'run_timer_softirq' '__wb_update_bandwidth'
[ 76.474090][ C0] ==================================================================
[ 76.482290][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 76.490681][ C0]
[ 76.492999][ C0] write to 0xffff88812c11dbe4 of 1 bytes by task 0 on cpu 1:
[ 76.500480][ C0] timer_clear_idle+0x3d/0x50
[ 76.505514][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 76.511396][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 76.516495][ C0] do_idle+0xac/0x290
[ 76.520458][ C0] cpu_startup_entry+0x14/0x20
[ 76.525205][ C0] start_secondary+0x164/0x1b0
[ 76.529970][ C0] secondary_startup_64+0xa4/0xb0
[ 76.534964][ C0]
[ 76.537278][ C0] read to 0xffff88812c11dbe4 of 1 bytes by interrupt on cpu 0:
[ 76.544810][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 76.550349][ C0] mod_timer+0x50e/0x830
[ 76.554586][ C0] sk_reset_timer+0x29/0xc0
[ 76.559075][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 76.564281][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 76.569377][ C0] tcp_rcv_established+0xc95/0xee0
[ 76.574468][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 76.579042][ C0] tcp_v4_rcv+0x1bbf/0x1d80
[ 76.583565][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 76.589109][ C0] ip_local_deliver_finish+0xf3/0x120
[ 76.594598][ C0] ip_local_deliver+0x135/0x220
[ 76.599451][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 76.604737][ C0] ip_sublist_rcv+0x3f8/0x530
[ 76.609401][ C0] ip_list_rcv+0x2f3/0x321
[ 76.613801][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 76.619775][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 76.626365][ C0] gro_normal_list.part.0+0x37/0xa0
[ 76.631558][ C0] gro_normal_one+0x14c/0x160
[ 76.636222][ C0] napi_gro_receive+0x27d/0x2f0
[ 76.641060][ C0] receive_buf+0x24e/0x2e20
[ 76.645545][ C0] virtnet_poll+0x343/0x790
[ 76.650053][ C0] net_rx_action+0x3ad/0xac0
[ 76.654629][ C0] __do_softirq+0x118/0x34a
[ 76.659118][ C0] irq_exit+0xb5/0xd0
[ 76.663079][ C0] do_IRQ+0x7b/0x120
[ 76.666952][ C0] ret_from_intr+0x0/0x21
[ 76.671256][ C0] native_safe_halt+0xe/0x10
[ 76.675837][ C0] default_idle+0x21/0x170
[ 76.680259][ C0] do_idle+0x1b7/0x290
[ 76.684345][ C0] cpu_startup_entry+0x14/0x20
[ 76.689096][ C0] rest_init+0xe4/0xeb
[ 76.693163][ C0] arch_call_rest_init+0x13/0x2b
[ 76.698124][ C0] start_kernel+0xcc2/0xceb
[ 76.702610][ C0] secondary_startup_64+0xa4/0xb0
[ 76.707609][ C0]
[ 76.709917][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 76.716057][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[ 76.723932][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 76.733981][ C0] ==================================================================
[ 76.742024][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 76.748593][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[ 76.756459][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 76.766495][ C0] Call Trace:
[ 76.769760][ C0]
[ 76.772609][ C0] dump_stack+0x11d/0x187
[ 76.776941][ C0] panic+0x210/0x640
[ 76.780837][ C0] ? vprintk_func+0x89/0x13a
[ 76.785431][ C0] kcsan_report.cold+0xc/0xf
[ 76.790030][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 76.795398][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 76.800939][ C0] mod_timer+0x50e/0x830
[ 76.805195][ C0] sk_reset_timer+0x29/0xc0
[ 76.809864][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 76.815063][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 76.820169][ C0] tcp_rcv_established+0xc95/0xee0
[ 76.825275][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 76.829909][ C0] tcp_v4_rcv+0x1bbf/0x1d80
[ 76.834413][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 76.839796][ C0] ip_local_deliver_finish+0xf3/0x120
[ 76.845157][ C0] ip_local_deliver+0x135/0x220
[ 76.849994][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 76.855627][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 76.860918][ C0] ip_sublist_rcv+0x3f8/0x530
[ 76.865592][ C0] ? ip_sublist_rcv+0x530/0x530
[ 76.870443][ C0] ip_list_rcv+0x2f3/0x321
[ 76.874859][ C0] ? ip_rcv+0x1b0/0x1b0
[ 76.879009][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 76.884982][ C0] ? netif_receive_skb_list_internal+0xa3/0x810
[ 76.891212][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 76.897358][ C0] gro_normal_list.part.0+0x37/0xa0
[ 76.902535][ C0] ? __write_once_size+0x7c/0x100
[ 76.907547][ C0] gro_normal_one+0x14c/0x160
[ 76.912207][ C0] napi_gro_receive+0x27d/0x2f0
[ 76.917039][ C0] receive_buf+0x24e/0x2e20
[ 76.921532][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0
[ 76.927063][ C0] virtnet_poll+0x343/0x790
[ 76.931565][ C0] net_rx_action+0x3ad/0xac0
[ 76.936157][ C0] __do_softirq+0x118/0x34a
[ 76.940807][ C0] irq_exit+0xb5/0xd0
[ 76.944779][ C0] do_IRQ+0x7b/0x120
[ 76.948664][ C0] common_interrupt+0xf/0xf
[ 76.953139][ C0]
[ 76.956066][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 76.961440][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d fc f8 43 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec f8 43 00 fb f4 cc 41 54 55 53 e8 37 fc 9a fc e8 12 ae b3 fd 0f 1f 44 00 00 48
[ 76.981025][ C0] RSP: 0018:ffffffff85a03e50 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 76.989426][ C0] RAX: 0000000000000000 RBX: ffffffff85a2b840 RCX: ffffffff82522f51
[ 76.997385][ C0] RDX: 0000000000000000 RSI: ffffffff82522f5a RDI: 0000000000000005
[ 77.005349][ C0] RBP: 0000000000000000 R08: ffffffff85a2b840 R09: 0000ffff8584b160
[ 77.013325][ C0] R10: 0000ffff85a03e38 R11: 0000ffff8584b167 R12: ffffffff85a2b840
[ 77.021297][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85a2b840
[ 77.029267][ C0] ? debug_smp_processor_id+0x31/0x129
[ 77.034723][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 77.040171][ C0] default_idle+0x21/0x170
[ 77.044573][ C0] do_idle+0x1b7/0x290
[ 77.048636][ C0] ? debug_smp_processor_id+0x3f/0x129
[ 77.054091][ C0] cpu_startup_entry+0x14/0x20
[ 77.058855][ C0] rest_init+0xe4/0xeb
[ 77.063689][ C0] arch_call_rest_init+0x13/0x2b
[ 77.068672][ C0] start_kernel+0xcc2/0xceb
[ 77.073171][ C0] secondary_startup_64+0xa4/0xb0
[ 77.079514][ C0] Kernel Offset: disabled
[ 77.083895][ C0] Rebooting in 86400 seconds..