[  OK  ] Started Getty on tty3.
[  OK  ] Started Getty on tty2.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Started Getty on tty1.
[  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.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts.
2020/06/16 23:56:06 fuzzer started
2020/06/16 23:56:06 dialing manager at 10.128.0.105:33867
2020/06/16 23:56:10 syscalls: 3085
2020/06/16 23:56:10 code coverage: enabled
2020/06/16 23:56:10 comparison tracing: enabled
2020/06/16 23:56:10 extra coverage: enabled
2020/06/16 23:56:10 setuid sandbox: enabled
2020/06/16 23:56:10 namespace sandbox: enabled
2020/06/16 23:56:10 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/16 23:56:10 fault injection: enabled
2020/06/16 23:56:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/16 23:56:10 net packet injection: enabled
2020/06/16 23:56:10 net device setup: enabled
2020/06/16 23:56:10 concurrency sanitizer: enabled
2020/06/16 23:56:10 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/16 23:56:10 USB emulation: enabled
syzkaller login: [   56.784442][ T8943] KCSAN: could not find function: '_find_next_bit'
2020/06/16 23:56:13 suppressing KCSAN reports in functions: 'find_get_pages_range_tag' 'generic_write_end' 'complete_signal' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' 'run_timer_softirq' 'page_counter_charge' 'generic_fillattr' '_find_next_bit' 'futex_wait_queue_me' 'add_timer' 'ext4_free_inodes_count' '__ext4_new_inode' 'copy_process' 'blk_mq_get_request' 'ext4_mark_iloc_dirty' 'ep_poll' 'ptrace_check_attach' '__send_signal' 'blk_mq_sched_dispatch_requests' 'ktime_get_real_seconds' 'alloc_pid' 
[   59.049224][    T0] ==================================================================
[   59.057648][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   59.065784][    T0] 
[   59.068111][    T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0:
[   59.075829][    T0]  tick_sched_do_timer+0xb4/0xd0
[   59.080756][    T0]  tick_sched_timer+0x3f/0xd0
[   59.085419][    T0]  __hrtimer_run_queues+0x271/0x600
[   59.090619][    T0]  hrtimer_interrupt+0x226/0x490
[   59.096062][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   59.101494][    T0]  apic_timer_interrupt+0xf/0x20
[   59.106407][    T0]  __sanitizer_cov_trace_pc+0x0/0x50
[   59.111943][    T0]  ip_sublist_rcv+0x371/0x530
[   59.116618][    T0]  ip_list_rcv+0x2f3/0x321
[   59.121017][    T0]  __netif_receive_skb_list_core+0x368/0x5c0
[   59.126984][    T0]  netif_receive_skb_list_internal+0x5c7/0x810
[   59.133116][    T0]  gro_normal_list.part.0+0x37/0xa0
[   59.138289][    T0]  gro_normal_one+0x14c/0x160
[   59.142953][    T0]  napi_gro_receive+0x27d/0x2f0
[   59.147784][    T0]  receive_buf+0x24c/0x3420
[   59.152267][    T0]  virtnet_poll+0x343/0x790
[   59.156749][    T0]  net_rx_action+0x3ad/0xac0
[   59.161331][    T0]  __do_softirq+0x118/0x34a
[   59.165831][    T0]  run_ksoftirqd+0x41/0x60
[   59.170232][    T0]  smpboot_thread_fn+0x374/0x4a0
[   59.175153][    T0]  kthread+0x203/0x230
[   59.179206][    T0]  ret_from_fork+0x1f/0x30
[   59.183596][    T0] 
[   59.185905][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1:
[   59.193174][    T0]  tick_nohz_next_event+0x181/0x340
[   59.198359][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   59.203901][    T0]  do_idle+0x1ad/0x290
[   59.207950][    T0]  cpu_startup_entry+0x14/0x20
[   59.212695][    T0]  start_secondary+0x169/0x1b0
[   59.217446][    T0]  secondary_startup_64+0xa4/0xb0
[   59.222533][    T0] 
[   59.224841][    T0] Reported by Kernel Concurrency Sanitizer on:
[   59.230990][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   59.238975][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.249095][    T0] ==================================================================
[   59.257267][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   59.264012][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   59.271879][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.281916][    T0] Call Trace:
[   59.285317][    T0]  dump_stack+0x11d/0x187
[   59.290192][    T0]  panic+0x210/0x640
[   59.294071][    T0]  ? vprintk_func+0x89/0x13a
[   59.298640][    T0]  kcsan_report.cold+0xc/0x1a
[   59.303311][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   59.308761][    T0]  tick_nohz_next_event+0x181/0x340
[   59.313953][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   59.319515][    T0]  ? ktime_get+0x1c9/0x210
[   59.324241][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   59.329764][    T0]  do_idle+0x1ad/0x290
[   59.333823][    T0]  cpu_startup_entry+0x14/0x20
[   59.338577][    T0]  start_secondary+0x169/0x1b0
[   59.343333][    T0]  secondary_startup_64+0xa4/0xb0
[   59.349835][    T0] Kernel Offset: disabled
[   59.354156][    T0] Rebooting in 86400 seconds..