[info] Using makefile-style concurrent boot in runlevel 2.
[   51.039622][   T27] audit: type=1800 audit(1586396711.942:21): pid=7591 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   51.097104][   T27] audit: type=1800 audit(1586396711.942:22): pid=7591 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts.
2020/04/09 01:45:23 fuzzer started
2020/04/09 01:45:24 dialing manager at 10.128.0.105:35101
2020/04/09 01:45:24 syscalls: 2955
2020/04/09 01:45:24 code coverage: enabled
2020/04/09 01:45:24 comparison tracing: enabled
2020/04/09 01:45:24 extra coverage: enabled
2020/04/09 01:45:24 setuid sandbox: enabled
2020/04/09 01:45:24 namespace sandbox: enabled
2020/04/09 01:45:24 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/09 01:45:24 fault injection: enabled
2020/04/09 01:45:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/09 01:45:24 net packet injection: enabled
2020/04/09 01:45:24 net device setup: enabled
2020/04/09 01:45:24 concurrency sanitizer: enabled
2020/04/09 01:45:24 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/09 01:45:24 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [   64.866303][ T7754] KCSAN: could not find function: '_find_next_bit'
2020/04/09 01:45:26 adding functions to KCSAN blacklist: 'generic_write_end' 'blk_mq_get_request' 'generic_fillattr' 'xas_clear_mark' '_find_next_bit' 'audit_log_start' 'run_timer_softirq' 'ep_poll' 'fasync_remove_entry' 'mod_timer' '__ext4_new_inode' 'ktime_get_real_seconds' 'blk_mq_sched_dispatch_requests' 
[   87.035149][    T0] ==================================================================
[   87.043351][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer
[   87.051934][    T0] 
[   87.054268][    T0] write to 0xffffffff85d056d0 of 4 bytes by interrupt on cpu 0:
[   87.061920][    T0]  tick_sched_do_timer+0xb4/0xd0
[   87.066874][    T0]  tick_sched_timer+0x3f/0xd0
[   87.071559][    T0]  __hrtimer_run_queues+0x271/0x600
[   87.076759][    T0]  hrtimer_interrupt+0x226/0x490
[   87.081714][    T0]  smp_apic_timer_interrupt+0xd8/0x270
[   87.087190][    T0]  apic_timer_interrupt+0xf/0x20
[   87.092306][    T0]  __tsan_read8+0x1b/0x100
[   87.096744][    T0]  tcp_v4_rcv+0x966/0x1d80
[   87.101267][    T0]  ip_protocol_deliver_rcu+0x4b/0x410
[   87.106660][    T0]  ip_local_deliver_finish+0xf3/0x120
[   87.112049][    T0]  ip_local_deliver+0x135/0x220
[   87.117039][    T0]  ip_sublist_rcv_finish+0xf0/0x140
[   87.122262][    T0]  ip_sublist_rcv+0x3f8/0x530
[   87.126946][    T0]  ip_list_rcv+0x2f3/0x321
[   87.131584][    T0]  __netif_receive_skb_list_core+0x368/0x5c0
[   87.137666][    T0]  netif_receive_skb_list_internal+0x5c7/0x810
[   87.143962][    T0]  gro_normal_list.part.0+0x37/0xa0
[   87.149145][    T0]  gro_normal_one+0x14c/0x160
[   87.153803][    T0]  napi_gro_receive+0x27d/0x2f0
[   87.158671][    T0]  receive_buf+0x24e/0x2e20
[   87.163244][    T0]  virtnet_poll+0x343/0x790
[   87.167744][    T0]  net_rx_action+0x3ad/0xac0
[   87.172326][    T0]  __do_softirq+0x118/0x34a
[   87.176817][    T0]  run_ksoftirqd+0x41/0x60
[   87.181214][    T0]  smpboot_thread_fn+0x374/0x4a0
[   87.186131][    T0]  kthread+0x1cb/0x1f0
[   87.190179][    T0]  ret_from_fork+0x1f/0x30
[   87.194601][    T0] 
[   87.197022][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 1:
[   87.204303][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   87.209834][    T0]  do_idle+0x1ad/0x290
[   87.214035][    T0]  cpu_startup_entry+0x14/0x20
[   87.218793][    T0]  start_secondary+0x164/0x1b0
[   87.223556][    T0]  secondary_startup_64+0xa4/0xb0
[   87.228699][    T0] 
[   87.231010][    T0] Reported by Kernel Concurrency Sanitizer on:
[   87.237166][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   87.245130][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   87.255182][    T0] ==================================================================
[   87.263245][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   87.269818][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   87.277690][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   87.288781][    T0] Call Trace:
[   87.292063][    T0]  dump_stack+0x11d/0x187
[   87.296392][    T0]  panic+0x210/0x640
[   87.300294][    T0]  ? vprintk_func+0x89/0x13a
[   87.304907][    T0]  kcsan_report.cold+0xc/0xf
[   87.309499][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   87.314869][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   87.320431][    T0]  do_idle+0x1ad/0x290
[   87.324500][    T0]  ? debug_smp_processor_id+0x3a/0x129
[   87.329942][    T0]  cpu_startup_entry+0x14/0x20
[   87.334815][    T0]  start_secondary+0x164/0x1b0
[   87.339583][    T0]  secondary_startup_64+0xa4/0xb0
[   87.346152][    T0] Kernel Offset: disabled
[   87.351013][    T0] Rebooting in 86400 seconds..