[  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 '10.128.0.194' (ECDSA) to the list of known hosts.
2020/04/16 08:46:46 fuzzer started
syzkaller login: [   45.266061][ T6692] as (6692) used greatest stack depth: 10440 bytes left
2020/04/16 08:46:48 dialing manager at 10.128.0.105:38905
2020/04/16 08:47:05 syscalls: 2960
2020/04/16 08:47:05 code coverage: enabled
2020/04/16 08:47:05 comparison tracing: enabled
2020/04/16 08:47:05 extra coverage: enabled
2020/04/16 08:47:05 setuid sandbox: enabled
2020/04/16 08:47:05 namespace sandbox: enabled
2020/04/16 08:47:05 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/16 08:47:05 fault injection: enabled
2020/04/16 08:47:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/16 08:47:05 net packet injection: enabled
2020/04/16 08:47:05 net device setup: enabled
2020/04/16 08:47:05 concurrency sanitizer: enabled
2020/04/16 08:47:05 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/16 08:47:05 USB emulation: /dev/raw-gadget does not exist
[   65.633910][ T6699] KCSAN: could not find function: '_find_next_bit'
2020/04/16 08:47:08 adding functions to KCSAN blacklist: '__ext4_new_inode' 'generic_write_end' 'echo_char' 'ext4_mb_good_group' 'dd_has_work' 'tick_sched_do_timer' '__dev_queue_xmit' 'io_sq_thread' 'generic_fillattr' 'page_counter_charge' 'add_timer' 'do_nanosleep' '__process_echoes' 'kauditd_thread' '__find_get_block' 'xas_clear_mark' 'pcpu_alloc' 'ext4_ext_try_to_merge_right' 'n_tty_receive_buf_common' 'copy_process' 'mod_timer' 'run_timer_softirq' '_find_next_bit' 'blk_mq_sched_dispatch_requests' 'ep_poll' 'find_get_pages_range_tag' '__snd_rawmidi_transmit_ack' 'ext4_free_inodes_count' 'tick_nohz_next_event' 'shmem_getpage_gfp' 
[  138.104308][    T0] ==================================================================
[  138.112612][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[  138.121534][    T0] 
[  138.123886][    T0] write to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 0:
[  138.131286][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[  138.136833][    T0]  do_idle+0x1ad/0x290
[  138.140902][    T0]  cpu_startup_entry+0x14/0x20
[  138.146795][    T0]  rest_init+0xe4/0xeb
[  138.150884][    T0]  arch_call_rest_init+0x13/0x2b
[  138.155823][    T0]  start_kernel+0x82d/0x852
[  138.160326][    T0]  secondary_startup_64+0xa4/0xb0
[  138.165337][    T0] 
[  138.167665][    T0] read to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 1:
[  138.175304][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  138.180854][    T0]  do_idle+0x1ad/0x290
[  138.184973][    T0]  cpu_startup_entry+0x14/0x20
[  138.189764][    T0]  start_secondary+0x169/0x1b0
[  138.194541][    T0]  secondary_startup_64+0xa4/0xb0
[  138.199538][    T0] 
[  138.201841][    T0] Reported by Kernel Concurrency Sanitizer on:
[  138.208170][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[  138.216038][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  138.226191][    T0] ==================================================================
[  138.234268][    T0] Kernel panic - not syncing: panic_on_warn set ...
[  138.240979][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[  138.248902][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  138.258947][    T0] Call Trace:
[  138.262240][    T0]  dump_stack+0x11d/0x187
[  138.266557][    T0]  panic+0x210/0x640
[  138.270467][    T0]  ? vprintk_func+0x89/0x13a
[  138.275056][    T0]  kcsan_report.cold+0xc/0x1a
[  138.279726][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[  138.285092][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[  138.290643][    T0]  do_idle+0x1ad/0x290
[  138.294716][    T0]  ? debug_smp_processor_id+0x3a/0x129
[  138.300179][    T0]  cpu_startup_entry+0x14/0x20
[  138.304939][    T0]  start_secondary+0x169/0x1b0
[  138.309703][    T0]  secondary_startup_64+0xa4/0xb0
[  138.316244][    T0] Kernel Offset: disabled
[  138.320636][    T0] Rebooting in 86400 seconds..