[  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

syzkaller login: [   42.181606][ T8876] bash (8876) used greatest stack depth: 10440 bytes left
Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts.
2020/05/13 22:33:36 fuzzer started
2020/05/13 22:33:37 dialing manager at 10.128.0.105:45429
2020/05/13 22:33:39 syscalls: 3055
2020/05/13 22:33:39 code coverage: enabled
2020/05/13 22:33:39 comparison tracing: enabled
2020/05/13 22:33:39 extra coverage: enabled
2020/05/13 22:33:39 setuid sandbox: enabled
2020/05/13 22:33:39 namespace sandbox: enabled
2020/05/13 22:33:39 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/13 22:33:39 fault injection: enabled
2020/05/13 22:33:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/13 22:33:39 net packet injection: enabled
2020/05/13 22:33:39 net device setup: enabled
2020/05/13 22:33:39 concurrency sanitizer: enabled
2020/05/13 22:33:39 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/13 22:33:39 USB emulation: enabled
[   55.203339][ T8914] KCSAN: could not find function: '_find_next_bit'
2020/05/13 22:33:41 adding functions to KCSAN blacklist: 'ep_poll' 'generic_write_end' 'copy_process' 'find_get_pages_range_tag' '__delete_from_page_cache' 'wbt_issue' 'run_timer_softirq' 'do_nanosleep' 'xas_clear_mark' 'tick_nohz_next_event' '_find_next_bit' '__ext4_new_inode' 'mod_timer' 
[   61.243425][    T0] ==================================================================
[   61.251542][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer
[   61.260049][    T0] 
[   61.262357][    T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1:
[   61.270004][    T0]  tick_sched_do_timer+0xb4/0xd0
[   61.274918][    T0]  tick_sched_timer+0x3f/0xd0
[   61.279568][    T0]  __hrtimer_run_queues+0x271/0x600
[   61.284740][    T0]  hrtimer_interrupt+0x226/0x490
[   61.289652][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   61.295086][    T0]  apic_timer_interrupt+0xf/0x20
[   61.300011][    T0]  kcsan_setup_watchpoint+0x25a/0x440
[   61.305359][    T0]  ktime_get+0x15c/0x210
[   61.309612][    T0]  tcp_mstamp_refresh+0x19/0x70
[   61.314568][    T0]  tcp_rcv_space_adjust+0x51/0x530
[   61.319650][    T0]  tcp_recvmsg+0xe47/0x1ba0
[   61.324128][    T0]  inet_recvmsg+0xc1/0x250
[   61.328516][    T0]  sock_recvmsg+0x8e/0xb0
[   61.332819][    T0]  sock_read_iter+0x185/0x230
[   61.337471][    T0]  new_sync_read+0x416/0x450
[   61.342035][    T0]  __vfs_read+0x9e/0xb0
[   61.346166][    T0]  vfs_read+0x13e/0x2b0
[   61.350291][    T0]  ksys_read+0x16a/0x1a0
[   61.354504][    T0]  __x64_sys_read+0x49/0x60
[   61.358982][    T0]  do_syscall_64+0xc7/0x3b0
[   61.363458][    T0]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   61.369314][    T0] 
[   61.371617][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0:
[   61.378874][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   61.384407][    T0]  do_idle+0x1ad/0x290
[   61.388449][    T0]  cpu_startup_entry+0x14/0x20
[   61.393189][    T0]  rest_init+0xe4/0xeb
[   61.397235][    T0]  arch_call_rest_init+0x13/0x2b
[   61.402156][    T0]  start_kernel+0x7fe/0x823
[   61.406633][    T0]  secondary_startup_64+0xa4/0xb0
[   61.411621][    T0] 
[   61.413920][    T0] Reported by Kernel Concurrency Sanitizer on:
[   61.420059][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[   61.427917][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.437955][    T0] ==================================================================
[   61.445989][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   61.452547][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[   61.460405][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   61.470430][    T0] Call Trace:
[   61.473710][    T0]  dump_stack+0x11d/0x187
[   61.478017][    T0]  panic+0x210/0x640
[   61.481891][    T0]  ? vprintk_func+0x89/0x13a
[   61.486457][    T0]  kcsan_report.cold+0xc/0x1a
[   61.491120][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   61.496475][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   61.501999][    T0]  do_idle+0x1ad/0x290
[   61.506057][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   61.511491][    T0]  cpu_startup_entry+0x14/0x20
[   61.516229][    T0]  rest_init+0xe4/0xeb
[   61.520285][    T0]  ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[   61.526501][    T0]  arch_call_rest_init+0x13/0x2b
[   61.531424][    T0]  start_kernel+0x7fe/0x823
[   61.535907][    T0]  secondary_startup_64+0xa4/0xb0
[   61.542159][    T0] Kernel Offset: disabled
[   61.546470][    T0] Rebooting in 86400 seconds..