[  OK  ] Reached target Login Prompts.
[  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.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.189' (ECDSA) to the list of known hosts.
2020/06/29 08:06:24 fuzzer started
2020/06/29 08:06:24 dialing manager at 10.128.0.105:32851
2020/06/29 08:06:24 syscalls: 3105
2020/06/29 08:06:24 code coverage: enabled
2020/06/29 08:06:24 comparison tracing: enabled
2020/06/29 08:06:24 extra coverage: enabled
2020/06/29 08:06:24 setuid sandbox: enabled
2020/06/29 08:06:24 namespace sandbox: enabled
2020/06/29 08:06:24 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/29 08:06:24 fault injection: enabled
2020/06/29 08:06:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/29 08:06:24 net packet injection: enabled
2020/06/29 08:06:24 net device setup: enabled
2020/06/29 08:06:24 concurrency sanitizer: enabled
2020/06/29 08:06:24 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/29 08:06:24 USB emulation: enabled
2020/06/29 08:06:26 suppressing KCSAN reports in functions: '__xa_clear_mark' 'do_sys_poll' '__delayacct_blkio_end' 'ext4_writepages' '__send_signal' '__add_to_page_cache_locked' 'ext4_free_inodes_count' 'n_tty_receive_buf_common' 'io_sq_thread' 'ext4_mb_good_group' 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'wg_packet_send_staged_packets' 'do_signal_stop' 'find_get_pages_range_tag' 'exit_mm' 'page_counter_charge' 'copy_process' 'blk_mq_rq_ctx_init' 'generic_write_end' '__blkdev_get' '__ext4_new_inode' 'do_epoll_wait' 'ext4_free_inode' 'ext4_mark_iloc_dirty' '__xa_set_mark' 'ext4_mb_regular_allocator' 'expire_timers' 'blk_mq_sched_dispatch_requests' 'complete_signal' 
syzkaller login: [   54.451525][    T0] ==================================================================
[   54.459642][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer
[   54.467519][    T0] 
[   54.469842][    T0] write to 0xffffffff87f50c10 of 4 bytes by interrupt on cpu 1:
[   54.477570][    T0]  tick_sched_timer+0x205/0x220
[   54.482417][    T0]  __run_hrtimer+0x154/0x4b0
[   54.486994][    T0]  hrtimer_interrupt+0x37c/0xa40
[   54.492107][    T0]  __sysvec_apic_timer_interrupt+0xa3/0x280
[   54.497983][    T0]  sysvec_apic_timer_interrupt+0xb5/0xd0
[   54.503623][    T0]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[   54.509585][    T0] 
[   54.511895][    T0] read to 0xffffffff87f50c10 of 4 bytes by task 0 on cpu 0:
[   54.519204][    T0]  tick_nohz_next_event+0x21d/0x310
[   54.524385][    T0]  tick_nohz_get_sleep_length+0xca/0x140
[   54.529994][    T0]  menu_select+0x328/0x1030
[   54.534473][    T0]  cpuidle_select+0x3d/0x50
[   54.538949][    T0]  do_idle+0x1eb/0x310
[   54.543113][    T0]  cpu_startup_entry+0x15/0x20
[   54.547898][    T0]  rest_init+0xd8/0xe0
[   54.551941][    T0]  arch_call_rest_init+0xa/0xb
[   54.556703][    T0]  start_kernel+0x608/0x6d0
[   54.561183][    T0]  secondary_startup_64+0xa4/0xb0
[   54.566177][    T0] 
[   54.568550][    T0] Reported by Kernel Concurrency Sanitizer on:
[   54.574684][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc3-syzkaller #0
[   54.582547][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   54.592669][    T0] ==================================================================
[   54.600710][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   54.607276][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc3-syzkaller #0
[   54.615151][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   54.625182][    T0] Call Trace:
[   54.628451][    T0]  dump_stack+0x10f/0x19d
[   54.632767][    T0]  panic+0x207/0x64a
[   54.636703][    T0]  ? vprintk_emit+0x44a/0x4f0
[   54.641396][    T0]  kcsan_report+0x684/0x690
[   54.645884][    T0]  ? kcsan_setup_watchpoint+0x453/0x4d0
[   54.651406][    T0]  ? tick_nohz_next_event+0x21d/0x310
[   54.656755][    T0]  ? tick_nohz_get_sleep_length+0xca/0x140
[   54.662539][    T0]  ? menu_select+0x328/0x1030
[   54.667235][    T0]  ? cpuidle_select+0x3d/0x50
[   54.671894][    T0]  ? do_idle+0x1eb/0x310
[   54.676113][    T0]  ? cpu_startup_entry+0x15/0x20
[   54.681025][    T0]  ? rest_init+0xd8/0xe0
[   54.685247][    T0]  ? arch_call_rest_init+0xa/0xb
[   54.690157][    T0]  ? start_kernel+0x608/0x6d0
[   54.694810][    T0]  ? secondary_startup_64+0xa4/0xb0
[   54.699991][    T0]  kcsan_setup_watchpoint+0x453/0x4d0
[   54.705393][    T0]  tick_nohz_next_event+0x21d/0x310
[   54.710577][    T0]  tick_nohz_get_sleep_length+0xca/0x140
[   54.716232][    T0]  menu_select+0x328/0x1030
[   54.720713][    T0]  ? _raw_spin_unlock_irq+0x4b/0x70
[   54.725891][    T0]  cpuidle_select+0x3d/0x50
[   54.730371][    T0]  do_idle+0x1eb/0x310
[   54.734414][    T0]  cpu_startup_entry+0x15/0x20
[   54.739153][    T0]  rest_init+0xd8/0xe0
[   54.743198][    T0]  ? time_init+0xc/0xc
[   54.747244][    T0]  arch_call_rest_init+0xa/0xb
[   54.751982][    T0]  start_kernel+0x608/0x6d0
[   54.756469][    T0]  secondary_startup_64+0xa4/0xb0
[   54.762835][    T0] Kernel Offset: disabled
[   54.767152][    T0] Rebooting in 86400 seconds..