[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.118' (ECDSA) to the list of known hosts.
2020/05/19 17:42:16 fuzzer started
2020/05/19 17:42:17 dialing manager at 10.128.0.105:39959
2020/05/19 17:42:17 syscalls: 3055
2020/05/19 17:42:17 code coverage: enabled
2020/05/19 17:42:17 comparison tracing: enabled
2020/05/19 17:42:17 extra coverage: enabled
2020/05/19 17:42:17 setuid sandbox: enabled
2020/05/19 17:42:17 namespace sandbox: enabled
2020/05/19 17:42:17 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/19 17:42:17 fault injection: enabled
2020/05/19 17:42:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/19 17:42:17 net packet injection: enabled
2020/05/19 17:42:17 net device setup: enabled
2020/05/19 17:42:17 concurrency sanitizer: enabled
2020/05/19 17:42:17 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/19 17:42:17 USB emulation: enabled
syzkaller login: [   57.263324][ T8920] KCSAN: could not find function: '_find_next_bit'
2020/05/19 17:42:24 adding functions to KCSAN blacklist: 'pcpu_alloc' '__snd_rawmidi_transmit_ack' 'mod_timer' 'exit_signals' 'dd_has_work' 'page_counter_charge' 'kauditd_thread' 'add_timer' 'ktime_get_real_seconds' 'io_sq_thread' 'get_cpu_iowait_time_us' '__mark_inode_dirty' 'alloc_pid' 'vfs_readlink' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'wbt_done' '__rb_erase_color' 'tick_sched_do_timer' 'blk_mq_get_request' 'ext4_free_inodes_count' '__process_echoes' 'find_get_pages_range_tag' 'generic_write_end' 'get_cpu_idle_time_us' 'copy_process' '__perf_event_overflow' 'tick_nohz_next_event' 'blk_mq_dispatch_rq_list' 'futex_wait_queue_me' 'pipe_double_lock' 'decrypt_packet' 'generic_fillattr' '_find_next_bit' 'ext4_mark_iloc_dirty' 'kcm_rcv_strparser' 'shmem_file_read_iter' 'xas_find_marked' 'lruvec_lru_size' 'ep_poll' 'do_nanosleep' 'run_timer_softirq' 'xas_clear_mark' '__filemap_fdatawrite_range' 'echo_char' 'atime_needs_update' 'commit_echoes' 'sit_tunnel_xmit' 
[  224.999454][    T0] ==================================================================
[  225.007759][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[  225.016872][    T0] 
[  225.019188][    T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1:
[  225.026637][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[  225.032251][    T0]  do_idle+0x1ad/0x290
[  225.036394][    T0]  cpu_startup_entry+0x14/0x20
[  225.041338][    T0]  start_secondary+0x169/0x1b0
[  225.046166][    T0]  secondary_startup_64+0xa4/0xb0
[  225.051428][    T0] 
[  225.053739][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0:
[  225.061005][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  225.066619][    T0]  do_idle+0x1ad/0x290
[  225.070668][    T0]  cpu_startup_entry+0x14/0x20
[  225.075406][    T0]  rest_init+0xe4/0xeb
[  225.079471][    T0]  arch_call_rest_init+0x13/0x2b
[  225.084385][    T0]  start_kernel+0x7fe/0x823
[  225.088867][    T0]  secondary_startup_64+0xa4/0xb0
[  225.093872][    T0] 
[  225.096239][    T0] Reported by Kernel Concurrency Sanitizer on:
[  225.102482][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[  225.110368][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  225.120886][    T0] ==================================================================
[  225.130088][    T0] Kernel panic - not syncing: panic_on_warn set ...
[  225.136739][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[  225.144661][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  225.155303][    T0] Call Trace:
[  225.158578][    T0]  dump_stack+0x11d/0x187
[  225.162909][    T0]  panic+0x210/0x640
[  225.166786][    T0]  ? vprintk_func+0x89/0x13a
[  225.171378][    T0]  kcsan_report.cold+0xc/0x1a
[  225.176275][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[  225.181643][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  225.187286][    T0]  do_idle+0x1ad/0x290
[  225.191349][    T0]  ? do_idle+0xe0/0x290
[  225.195764][    T0]  cpu_startup_entry+0x14/0x20
[  225.200788][    T0]  rest_init+0xe4/0xeb
[  225.204991][    T0]  ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[  225.211244][    T0]  arch_call_rest_init+0x13/0x2b
[  225.216180][    T0]  start_kernel+0x7fe/0x823
[  225.220677][    T0]  secondary_startup_64+0xa4/0xb0
[  225.227035][    T0] Kernel Offset: disabled
[  225.231355][    T0] Rebooting in 86400 seconds..