[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 36.241396][ T23] audit: type=1800 audit(1571670269.549:25): pid=7162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 36.278242][ T23] audit: type=1800 audit(1571670269.549:26): pid=7162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 36.302899][ T23] audit: type=1800 audit(1571670269.559:27): pid=7162 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.1.53' (ECDSA) to the list of known hosts.
2019/10/21 15:04:39 fuzzer started
2019/10/21 15:04:42 dialing manager at 10.128.0.105:39747
2019/10/21 15:04:42 syscalls: 2524
2019/10/21 15:04:42 code coverage: enabled
2019/10/21 15:04:42 comparison tracing: enabled
2019/10/21 15:04:42 extra coverage: extra coverage is not supported by the kernel
2019/10/21 15:04:42 setuid sandbox: enabled
2019/10/21 15:04:42 namespace sandbox: enabled
2019/10/21 15:04:42 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/21 15:04:42 fault injection: enabled
2019/10/21 15:04:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/21 15:04:42 net packet injection: enabled
2019/10/21 15:04:42 net device setup: enabled
2019/10/21 15:04:42 concurrency sanitizer: enabled
syzkaller login: [ 50.757164][ C0] ==================================================================
[ 50.765813][ C0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer
[ 50.774610][ C0]
[ 50.777064][ C0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1:
[ 50.784807][ C0] tick_nohz_next_event+0x1a4/0x380
[ 50.790284][ C0] tick_nohz_idle_stop_tick+0x3c2/0x670
[ 50.795904][ C0] do_idle+0x1a5/0x280
[ 50.800188][ C0] cpu_startup_entry+0x1b/0x20
[ 50.805039][ C0] start_secondary+0x208/0x260
[ 50.809974][ C0] secondary_startup_64+0xa4/0xb0
[ 50.815065][ C0]
[ 50.818179][ C0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0:
[ 50.826356][ C0] tick_sched_do_timer+0xc0/0xe0
[ 50.831469][ C0] tick_sched_timer+0x43/0xe0
[ 50.836220][ C0] __hrtimer_run_queues+0x288/0x600
[ 50.841817][ C0] hrtimer_interrupt+0x22a/0x480
[ 50.848262][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 50.853812][ C0] apic_timer_interrupt+0xf/0x20
[ 50.859180][ C0] native_safe_halt+0xe/0x10
[ 50.863757][ C0] arch_cpu_idle+0x1f/0x30
[ 50.868970][ C0] default_idle_call+0x1e/0x40
[ 50.873846][ C0] do_idle+0x1af/0x280
[ 50.878095][ C0] cpu_startup_entry+0x1b/0x20
[ 50.883149][ C0] rest_init+0xec/0xf6
[ 50.888016][ C0] arch_call_rest_init+0x17/0x37
[ 50.894696][ C0]
[ 50.897983][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 50.906020][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 50.913312][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.925764][ C0] ==================================================================
[ 50.934404][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 50.941510][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 50.948918][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 50.960811][ C0] Call Trace:
[ 50.964419][ C0]
[ 50.967292][ C0] dump_stack+0xf5/0x159
[ 50.971934][ C0] panic+0x210/0x640
[ 50.976234][ C0] ? default_idle_call+0x1e/0x40
[ 50.981168][ C0] ? vprintk_func+0x8d/0x140
[ 50.985846][ C0] kcsan_report.cold+0xc/0x10
[ 50.991260][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 50.996905][ C0] __tsan_write4+0x32/0x40
[ 51.002018][ C0] tick_sched_do_timer+0xc0/0xe0
[ 51.008807][ C0] tick_sched_timer+0x43/0xe0
[ 51.015036][ C0] __hrtimer_run_queues+0x288/0x600
[ 51.020328][ C0] ? tick_sched_do_timer+0xe0/0xe0
[ 51.025863][ C0] hrtimer_interrupt+0x22a/0x480
[ 51.031126][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 51.037154][ C0] ? smp_call_function_single_interrupt+0x80/0x1c0
[ 51.043907][ C0] apic_timer_interrupt+0xf/0x20
[ 51.048827][ C0]
[ 51.051850][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 51.057601][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d fc b2 4b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec b2 4b 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 72 12 a4 fc e8 6d 8e b8 fd 0f
[ 51.078945][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 51.087425][ C0] RAX: f3b645a1cac0fc77 RBX: ffffffff85a2b780 RCX: 000000000000077c
[ 51.095483][ C0] RDX: 00000000006958c0 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 51.104569][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 51.112623][ C0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000
[ 51.121080][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 51.129930][ C0] ? default_idle+0x50/0x230
[ 51.134736][ C0] arch_cpu_idle+0x1f/0x30
[ 51.140484][ C0] default_idle_call+0x1e/0x40
[ 51.146196][ C0] do_idle+0x1af/0x280
[ 51.150646][ C0] cpu_startup_entry+0x1b/0x20
[ 51.155666][ C0] rest_init+0xec/0xf6
[ 51.160249][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 51.167583][ C0] arch_call_rest_init+0x17/0x37
[ 51.173214][ C0] start_kernel+0x838/0x85e
[ 51.179245][ C0] x86_64_start_reservations+0x29/0x2b
[ 51.185098][ C0] x86_64_start_kernel+0x72/0x76
[ 51.190313][ C0] secondary_startup_64+0xa4/0xb0
[ 51.197142][ C0] Kernel Offset: disabled
[ 51.201973][ C0] Rebooting in 86400 seconds..