[  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 '10.128.0.183' (ECDSA) to the list of known hosts.
2020/05/15 12:42:27 fuzzer started
2020/05/15 12:42:27 dialing manager at 10.128.0.105:37863
2020/05/15 12:42:28 syscalls: 3055
2020/05/15 12:42:28 code coverage: enabled
2020/05/15 12:42:28 comparison tracing: enabled
2020/05/15 12:42:28 extra coverage: enabled
2020/05/15 12:42:28 setuid sandbox: enabled
2020/05/15 12:42:28 namespace sandbox: enabled
2020/05/15 12:42:28 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/15 12:42:28 fault injection: enabled
2020/05/15 12:42:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/15 12:42:28 net packet injection: enabled
2020/05/15 12:42:28 net device setup: enabled
2020/05/15 12:42:28 concurrency sanitizer: enabled
2020/05/15 12:42:28 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/15 12:42:28 USB emulation: enabled
syzkaller login: [   52.447292][ T8920] KCSAN: could not find function: 'poll_schedule_timeout'
[   53.061140][ T8920] KCSAN: could not find function: '_find_next_bit'
2020/05/15 12:42:30 adding functions to KCSAN blacklist: 'do_signal_stop' 'page_counter_charge' 'tick_nohz_idle_stop_tick' 'wbt_done' '__ext4_new_inode' 'ep_poll' 'pcpu_alloc' 'mod_timer' 'poll_schedule_timeout' '_find_next_bit' '__mpage_writepage' 'find_get_pages_range_tag' 'generic_write_end' 'xas_clear_mark' 'shmem_file_read_iter' 'copy_process' 'do_nanosleep' 
[   65.162336][    T0] ==================================================================
[   65.170573][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[   65.178738][    T0] 
[   65.181068][    T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0:
[   65.188707][    T0]  tick_sched_do_timer+0xb4/0xd0
[   65.193650][    T0]  tick_sched_timer+0x3f/0xd0
[   65.198322][    T0]  __hrtimer_run_queues+0x271/0x600
[   65.203689][    T0]  hrtimer_interrupt+0x226/0x490
[   65.208628][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   65.214090][    T0]  apic_timer_interrupt+0xf/0x20
[   65.219027][    T0]  __tsan_read8+0xa6/0x110
[   65.223431][    T0]  ip_finish_output2+0x44/0xed0
[   65.228293][    T0]  __ip_finish_output+0x22f/0x460
[   65.233309][    T0]  ip_finish_output+0x3e/0x160
[   65.238071][    T0]  ip_output+0xf2/0x240
[   65.242230][    T0]  ip_local_out+0x70/0x90
[   65.246559][    T0]  __ip_queue_xmit+0x3a6/0xa40
[   65.251317][    T0]  ip_queue_xmit+0x3e/0x50
[   65.255777][    T0]  __tcp_transmit_skb+0xe0c/0x1d80
[   65.260883][    T0]  __tcp_send_ack+0x22c/0x2f0
[   65.265542][    T0]  tcp_send_ack+0x2d/0x40
[   65.269858][    T0]  tcp_cleanup_rbuf+0x124/0x340
[   65.274707][    T0]  tcp_recvmsg+0x686/0x1ba0
[   65.279385][    T0]  inet_recvmsg+0xc1/0x250
[   65.283858][    T0]  sock_recvmsg+0x8e/0xb0
[   65.288269][    T0]  sock_read_iter+0x185/0x230
[   65.292936][    T0]  new_sync_read+0x416/0x450
[   65.297521][    T0]  __vfs_read+0x9e/0xb0
[   65.301688][    T0]  vfs_read+0x13e/0x2b0
[   65.305837][    T0]  ksys_read+0x16a/0x1a0
[   65.310071][    T0]  __x64_sys_read+0x49/0x60
[   65.314575][    T0]  do_syscall_64+0xc7/0x3b0
[   65.319078][    T0]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   65.325062][    T0] 
[   65.327383][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1:
[   65.334670][    T0]  tick_nohz_next_event+0x181/0x340
[   65.339868][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   65.345405][    T0]  do_idle+0x1ad/0x290
[   65.349629][    T0]  cpu_startup_entry+0x14/0x20
[   65.354381][    T0]  start_secondary+0x169/0x1b0
[   65.359136][    T0]  secondary_startup_64+0xa4/0xb0
[   65.364148][    T0] 
[   65.366463][    T0] Reported by Kernel Concurrency Sanitizer on:
[   65.372661][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   65.380532][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.390604][    T0] ==================================================================
[   65.398651][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   65.405218][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   65.413078][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.423122][    T0] Call Trace:
[   65.426400][    T0]  dump_stack+0x11d/0x187
[   65.430720][    T0]  panic+0x210/0x640
[   65.434604][    T0]  ? vprintk_func+0x89/0x13a
[   65.440127][    T0]  kcsan_report.cold+0xc/0x1a
[   65.444802][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   65.450165][    T0]  tick_nohz_next_event+0x181/0x340
[   65.455343][    T0]  tick_nohz_idle_stop_tick+0x3b9/0x680
[   65.460881][    T0]  ? ktime_get+0x1c9/0x210
[   65.465274][    T0]  ? debug_smp_processor_id+0x3f/0x129
[   65.470723][    T0]  do_idle+0x1ad/0x290
[   65.474772][    T0]  ? debug_smp_processor_id+0x3a/0x129
[   65.480268][    T0]  cpu_startup_entry+0x14/0x20
[   65.485710][    T0]  start_secondary+0x169/0x1b0
[   65.490455][    T0]  secondary_startup_64+0xa4/0xb0
[   65.496934][    T0] Kernel Offset: disabled
[   65.501303][    T0] Rebooting in 86400 seconds..