[  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 '10.128.0.89' (ECDSA) to the list of known hosts.
2020/05/01 10:00:13 fuzzer started
2020/05/01 10:00:13 dialing manager at 10.128.0.105:38857
2020/05/01 10:00:26 syscalls: 2964
2020/05/01 10:00:26 code coverage: enabled
2020/05/01 10:00:26 comparison tracing: enabled
2020/05/01 10:00:26 extra coverage: enabled
2020/05/01 10:00:26 setuid sandbox: enabled
2020/05/01 10:00:26 namespace sandbox: enabled
2020/05/01 10:00:26 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/01 10:00:26 fault injection: enabled
2020/05/01 10:00:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/01 10:00:26 net packet injection: enabled
2020/05/01 10:00:26 net device setup: enabled
2020/05/01 10:00:26 concurrency sanitizer: enabled
2020/05/01 10:00:26 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/01 10:00:26 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [   58.393097][ T6727] KCSAN: could not find function: '_find_next_bit'
2020/05/01 10:00:29 adding functions to KCSAN blacklist: 'echo_char' 'page_counter_charge' 'run_timer_softirq' 'do_nanosleep' '__ext4_new_inode' 'kcm_rfree' 'add_timer' '_find_next_bit' 'pipe_double_lock' 'blk_mq_get_request' 'mod_timer' 'generic_write_end' 'ep_poll' 'futex_wait_queue_me' 'xas_clear_mark' 'copy_process' 'tick_sched_do_timer' 'ext4_free_inodes_count' '__delete_from_page_cache' 'alloc_pid' 'dd_has_work' 'find_get_pages_range_tag' 'blk_mq_dispatch_rq_list' 'ext4_mark_iloc_dirty' 'generic_fillattr' 'blk_mq_sched_dispatch_requests' 
[  128.301593][    T0] ==================================================================
[  128.309714][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[  128.318628][    T0] 
[  128.320966][    T0] write to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 1:
[  128.328357][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[  128.333911][    T0]  do_idle+0x1ad/0x290
[  128.337987][    T0]  cpu_startup_entry+0x14/0x20
[  128.342778][    T0]  start_secondary+0x169/0x1b0
[  128.348158][    T0]  secondary_startup_64+0xa4/0xb0
[  128.353179][    T0] 
[  128.355515][    T0] read to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 0:
[  128.362807][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  128.368350][    T0]  do_idle+0x1ad/0x290
[  128.372402][    T0]  cpu_startup_entry+0x14/0x20
[  128.377188][    T0]  rest_init+0xe4/0xeb
[  128.381252][    T0]  arch_call_rest_init+0x13/0x2b
[  128.386198][    T0]  start_kernel+0x82d/0x852
[  128.390711][    T0]  secondary_startup_64+0xa4/0xb0
[  128.395726][    T0] 
[  128.398051][    T0] Reported by Kernel Concurrency Sanitizer on:
[  128.404214][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[  128.412108][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  128.422166][    T0] ==================================================================
[  128.430229][    T0] Kernel panic - not syncing: panic_on_warn set ...
[  128.436823][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[  128.444723][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  128.454800][    T0] Call Trace:
[  128.458129][    T0]  dump_stack+0x11d/0x187
[  128.462471][    T0]  panic+0x210/0x640
[  128.466379][    T0]  ? vprintk_func+0x89/0x13a
[  128.470997][    T0]  kcsan_report.cold+0xc/0x1a
[  128.475676][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[  128.481052][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  128.486608][    T0]  do_idle+0x1ad/0x290
[  128.490690][    T0]  ? debug_smp_processor_id+0x3a/0x129
[  128.496150][    T0]  cpu_startup_entry+0x14/0x20
[  128.501341][    T0]  rest_init+0xe4/0xeb
[  128.505419][    T0]  arch_call_rest_init+0x13/0x2b
[  128.510395][    T0]  start_kernel+0x82d/0x852
[  128.514933][    T0]  secondary_startup_64+0xa4/0xb0
[  128.521213][    T0] Kernel Offset: disabled
[  128.525663][    T0] Rebooting in 86400 seconds..