Starting Update UTMP about System Runlevel Changes...
[   43.049394][ T8832] bash (8832) used greatest stack depth: 10440 bytes left
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts.
2020/06/15 08:08:50 fuzzer started
2020/06/15 08:08:50 dialing manager at 10.128.0.105:32959
2020/06/15 08:08:51 syscalls: 3085
2020/06/15 08:08:51 code coverage: enabled
2020/06/15 08:08:51 comparison tracing: enabled
2020/06/15 08:08:51 extra coverage: enabled
2020/06/15 08:08:51 setuid sandbox: enabled
2020/06/15 08:08:51 namespace sandbox: enabled
2020/06/15 08:08:51 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/15 08:08:51 fault injection: enabled
2020/06/15 08:08:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/15 08:08:51 net packet injection: enabled
2020/06/15 08:08:51 net device setup: enabled
2020/06/15 08:08:51 concurrency sanitizer: enabled
2020/06/15 08:08:51 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/15 08:08:51 USB emulation: enabled
2020/06/15 08:08:52 suppressing KCSAN reports in functions: 'ep_poll' '__ext4_new_inode' '__mpage_writepage' 'generic_file_read_iter' '_find_next_bit' 
syzkaller login: [   52.929591][ T8917] KCSAN: could not find function: '_find_next_bit'
[   54.146182][    T0] ==================================================================
[   54.154340][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer
[   54.162825][    T0] 
[   54.165158][    T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0:
[   54.172970][    T0]  tick_sched_do_timer+0xb4/0xd0
[   54.177909][    T0]  tick_sched_timer+0x3f/0xd0
[   54.182601][    T0]  __hrtimer_run_queues+0x271/0x600
[   54.187819][    T0]  hrtimer_interrupt+0x226/0x490
[   54.192758][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   54.198219][    T0]  apic_timer_interrupt+0xf/0x20
[   54.203160][    T0]  __tsan_unaligned_write2+0x9e/0x110
[   54.208531][    T0]  nf_ct_get_tuple+0x2ef/0x4a0
[   54.213296][    T0]  nf_conntrack_in+0x238/0xa60
[   54.218071][    T0]  ipv4_conntrack_local+0xb1/0x120
[   54.223185][    T0]  nf_hook_slow+0x7c/0x160
[   54.227611][    T0]  __ip_local_out+0x1f3/0x2b0
[   54.232293][    T0]  ip_local_out+0x2d/0x90
[   54.236648][    T0]  __ip_queue_xmit+0x3a6/0xa40
[   54.241405][    T0]  ip_queue_xmit+0x3e/0x50
[   54.245820][    T0]  __tcp_transmit_skb+0xe0c/0x1d80
[   54.251106][    T0]  __tcp_send_ack+0x22c/0x2f0
[   54.255783][    T0]  tcp_send_ack+0x2d/0x40
[   54.260200][    T0]  __tcp_ack_snd_check+0xcc/0x550
[   54.265226][    T0]  tcp_rcv_established+0xc95/0xee0
[   54.270340][    T0]  tcp_v4_do_rcv+0x396/0x4f0
[   54.274935][    T0]  tcp_v4_rcv+0x1c55/0x1e10
[   54.279441][    T0]  ip_protocol_deliver_rcu+0x4b/0x410
[   54.284843][    T0]  ip_local_deliver_finish+0xf3/0x120
[   54.290226][    T0]  ip_local_deliver+0x135/0x220
[   54.295083][    T0]  ip_sublist_rcv_finish+0xf0/0x140
[   54.300291][    T0]  ip_sublist_rcv+0x3f8/0x530
[   54.304962][    T0]  ip_list_rcv+0x2f3/0x321
[   54.310543][    T0]  __netif_receive_skb_list_core+0x368/0x5c0
[   54.316619][    T0]  netif_receive_skb_list_internal+0x5c7/0x810
[   54.322825][    T0]  gro_normal_list.part.0+0x37/0xa0
[   54.328038][    T0]  gro_normal_one+0x14c/0x160
[   54.332710][    T0]  napi_gro_receive+0x27d/0x2f0
[   54.337549][    T0]  receive_buf+0x24c/0x3420
[   54.342065][    T0]  virtnet_poll+0x343/0x790
[   54.346555][    T0]  net_rx_action+0x3ad/0xac0
[   54.351149][    T0]  __do_softirq+0x118/0x34a
[   54.355642][    T0]  run_ksoftirqd+0x41/0x60
[   54.360053][    T0]  smpboot_thread_fn+0x374/0x4a0
[   54.364973][    T0]  kthread+0x203/0x230
[   54.369025][    T0]  ret_from_fork+0x1f/0x30
[   54.373417][    T0] 
[   54.375734][    T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1:
[   54.383005][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   54.388534][    T0]  do_idle+0x1ad/0x290
[   54.392598][    T0]  cpu_startup_entry+0x14/0x20
[   54.397349][    T0]  start_secondary+0x169/0x1b0
[   54.402111][    T0]  secondary_startup_64+0xa4/0xb0
[   54.407231][    T0] 
[   54.409560][    T0] Reported by Kernel Concurrency Sanitizer on:
[   54.415701][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   54.423674][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   54.433721][    T0] ==================================================================
[   54.441944][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   54.448529][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0
[   54.456399][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   54.466440][    T0] Call Trace:
[   54.469724][    T0]  dump_stack+0x11d/0x187
[   54.474058][    T0]  panic+0x210/0x640
[   54.477963][    T0]  ? vprintk_func+0x89/0x13a
[   54.482557][    T0]  kcsan_report.cold+0xc/0x1a
[   54.487237][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   54.492620][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   54.498175][    T0]  do_idle+0x1ad/0x290
[   54.502245][    T0]  cpu_startup_entry+0x14/0x20
[   54.507013][    T0]  start_secondary+0x169/0x1b0
[   54.511870][    T0]  secondary_startup_64+0xa4/0xb0
[   54.518280][    T0] Kernel Offset: disabled
[   54.522685][    T0] Rebooting in 86400 seconds..