[  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 '10.128.0.201' (ECDSA) to the list of known hosts.
2020/06/03 14:15:38 fuzzer started
2020/06/03 14:15:38 dialing manager at 10.128.0.105:40391
2020/06/03 14:15:38 syscalls: 3055
2020/06/03 14:15:38 code coverage: enabled
2020/06/03 14:15:38 comparison tracing: enabled
2020/06/03 14:15:38 extra coverage: enabled
2020/06/03 14:15:38 setuid sandbox: enabled
2020/06/03 14:15:38 namespace sandbox: enabled
2020/06/03 14:15:38 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/03 14:15:38 fault injection: enabled
2020/06/03 14:15:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/03 14:15:38 net packet injection: enabled
2020/06/03 14:15:38 net device setup: enabled
2020/06/03 14:15:38 concurrency sanitizer: enabled
2020/06/03 14:15:38 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/03 14:15:38 USB emulation: enabled
syzkaller login: [   53.619619][ T8933] KCSAN: could not find function: '_find_next_bit'
2020/06/03 14:15:42 adding functions to KCSAN blacklist: 'run_timer_softirq' 'page_counter_charge' 'alloc_pid' 'do_settimeofday64' 'wbt_issue' 'copy_process' 'blk_mq_sched_dispatch_requests' '_find_next_bit' 'kauditd_thread' 'do_nanosleep' 'generic_write_end' 'n_tty_receive_buf_common' 'mod_timer' 'xas_clear_mark' 'find_get_pages_range_tag' 'generic_file_read_iter' '__ext4_new_inode' 'ext4_free_inodes_count' 'tick_nohz_idle_stop_tick' 'generic_fillattr' '__process_echoes' 'ep_poll' 'blk_mq_get_request' 'futex_wait_queue_me' 
[   65.909280][    T0] ==================================================================
[   65.917426][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   65.925563][    T0] 
[   65.927889][    T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1:
[   65.935530][    T0]  tick_sched_do_timer+0xb4/0xd0
[   65.940467][    T0]  tick_sched_timer+0x3f/0xd0
[   65.945139][    T0]  __hrtimer_run_queues+0x271/0x600
[   65.950323][    T0]  hrtimer_interrupt+0x226/0x490
[   65.955275][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   65.960712][    T0]  apic_timer_interrupt+0xf/0x20
[   65.965626][    T0]  __tsan_read2+0xac/0x110
[   65.970042][    T0]  ipt_do_table+0x5f2/0xe70
[   65.974620][    T0]  iptable_mangle_hook+0x134/0x270
[   65.979721][    T0]  nf_hook_slow+0x7c/0x160
[   65.984111][    T0]  __ip_local_out+0x1f3/0x2b0
[   65.988778][    T0]  ip_local_out+0x2d/0x90
[   65.993103][    T0]  __ip_queue_xmit+0x3a6/0xa40
[   65.997836][    T0]  ip_queue_xmit+0x3e/0x50
[   66.002225][    T0]  __tcp_transmit_skb+0xe0c/0x1d80
[   66.007310][    T0]  __tcp_send_ack+0x22c/0x2f0
[   66.011968][    T0]  tcp_send_ack+0x2d/0x40
[   66.016275][    T0]  __tcp_ack_snd_check+0xcc/0x550
[   66.021277][    T0]  tcp_rcv_established+0xc95/0xee0
[   66.026363][    T0]  tcp_v4_do_rcv+0x396/0x4f0
[   66.030934][    T0]  __release_sock+0x130/0x1e0
[   66.035598][    T0]  release_sock+0x5e/0x160
[   66.039988][    T0]  tcp_recvmsg+0x68e/0x1ba0
[   66.044469][    T0]  inet_recvmsg+0xc1/0x250
[   66.048867][    T0]  sock_recvmsg+0x8e/0xb0
[   66.053186][    T0]  sock_read_iter+0x185/0x230
[   66.057852][    T0]  new_sync_read+0x416/0x450
[   66.062419][    T0]  __vfs_read+0x9e/0xb0
[   66.066549][    T0]  vfs_read+0x13e/0x2b0
[   66.070736][    T0]  ksys_read+0x16a/0x1a0
[   66.074959][    T0]  __x64_sys_read+0x49/0x60
[   66.079451][    T0]  do_syscall_64+0xc7/0x3b0
[   66.083945][    T0]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   66.089817][    T0] 
[   66.092126][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0:
[   66.099389][    T0]  tick_nohz_next_event+0x181/0x340
[   66.104565][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   66.110087][    T0]  do_idle+0x1ad/0x290
[   66.114129][    T0]  cpu_startup_entry+0x14/0x20
[   66.118867][    T0]  rest_init+0xe4/0xeb
[   66.122909][    T0]  arch_call_rest_init+0x13/0x2b
[   66.127844][    T0]  start_kernel+0x7fe/0x823
[   66.132335][    T0]  secondary_startup_64+0xa4/0xb0
[   66.137343][    T0] 
[   66.139643][    T0] Reported by Kernel Concurrency Sanitizer on:
[   66.145771][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[   66.153631][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.163660][    T0] ==================================================================
[   66.171696][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   66.178268][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[   66.186126][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.196156][    T0] Call Trace:
[   66.199426][    T0]  dump_stack+0x11d/0x187
[   66.203748][    T0]  panic+0x210/0x640
[   66.207634][    T0]  ? vprintk_func+0x89/0x13a
[   66.212245][    T0]  kcsan_report.cold+0xc/0x1a
[   66.216905][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   66.222258][    T0]  tick_nohz_next_event+0x181/0x340
[   66.227436][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   66.232957][    T0]  ? ktime_get+0x1c9/0x210
[   66.237351][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   66.242790][    T0]  do_idle+0x1ad/0x290
[   66.246850][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   66.252289][    T0]  cpu_startup_entry+0x14/0x20
[   66.257027][    T0]  rest_init+0xe4/0xeb
[   66.261073][    T0]  ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[   66.267302][    T0]  arch_call_rest_init+0x13/0x2b
[   66.272216][    T0]  start_kernel+0x7fe/0x823
[   66.276699][    T0]  secondary_startup_64+0xa4/0xb0
[   66.282762][    T0] Kernel Offset: disabled
[   66.287089][    T0] Rebooting in 86400 seconds..