[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 37.484473][ T26] audit: type=1800 audit(1571345985.991:25): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 37.519018][ T26] audit: type=1800 audit(1571345985.991:26): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 37.550202][ T26] audit: type=1800 audit(1571345985.991:27): pid=7109 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 '10.128.0.44' (ECDSA) to the list of known hosts.
2019/10/17 20:59:57 fuzzer started
2019/10/17 20:59:59 dialing manager at 10.128.0.105:43535
2019/10/17 20:59:59 syscalls: 2524
2019/10/17 20:59:59 code coverage: enabled
2019/10/17 20:59:59 comparison tracing: enabled
2019/10/17 20:59:59 extra coverage: extra coverage is not supported by the kernel
2019/10/17 20:59:59 setuid sandbox: enabled
2019/10/17 20:59:59 namespace sandbox: enabled
2019/10/17 20:59:59 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/17 20:59:59 fault injection: enabled
2019/10/17 20:59:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/17 20:59:59 net packet injection: enabled
2019/10/17 20:59:59 net device setup: enabled
2019/10/17 20:59:59 concurrency sanitizer: enabled
syzkaller login: [ 51.246062][ T0] ==================================================================
[ 51.254312][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[ 51.263787][ T0]
[ 51.266112][ T0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1:
[ 51.273811][ T0] tick_do_update_jiffies64+0x105/0x260
[ 51.279699][ T0] tick_sched_do_timer+0xd4/0xe0
[ 51.284613][ T0] tick_sched_timer+0x43/0xe0
[ 51.289270][ T0] __hrtimer_run_queues+0x288/0x600
[ 51.294462][ T0] hrtimer_interrupt+0x22a/0x480
[ 51.299392][ T0] smp_apic_timer_interrupt+0xdc/0x280
[ 51.304841][ T0] apic_timer_interrupt+0xf/0x20
[ 51.309748][ T0]
[ 51.312071][ T0] read to 0xffffffff86042008 of 8 bytes by task 0 on cpu 0:
[ 51.319400][ T0] tick_do_update_jiffies64+0x2b/0x260
[ 51.325041][ T0] tick_irq_enter+0x139/0x1c0
[ 51.329706][ T0] irq_enter+0x4f/0x60
[ 51.333777][ T0] smp_apic_timer_interrupt+0x55/0x280
[ 51.339297][ T0] apic_timer_interrupt+0xf/0x20
[ 51.344225][ T0] native_safe_halt+0xe/0x10
[ 51.348795][ T0] arch_cpu_idle+0x1f/0x30
[ 51.353200][ T0] default_idle_call+0x1e/0x40
[ 51.357940][ T0] do_idle+0x1af/0x280
[ 51.361986][ T0] cpu_startup_entry+0x1b/0x20
[ 51.366753][ T0] rest_init+0xec/0xf6
[ 51.370801][ T0] arch_call_rest_init+0x17/0x37
[ 51.375730][ T0] start_kernel+0x838/0x85e
[ 51.380207][ T0]
[ 51.382522][ T0] Reported by Kernel Concurrency Sanitizer on:
[ 51.388659][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 51.395752][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 51.405905][ T0] ==================================================================
[ 51.413978][ T0] Kernel panic - not syncing: panic_on_warn set ...
[ 51.420571][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 51.427666][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 51.437709][ T0] Call Trace:
[ 51.440983][ T0]
[ 51.443821][ T0] dump_stack+0xf5/0x159
[ 51.448061][ T0] panic+0x210/0x640
[ 51.452027][ T0] ? do_idle+0x1af/0x280
[ 51.456257][ T0] ? vprintk_func+0x8d/0x140
[ 51.461005][ T0] kcsan_report.cold+0xc/0x10
[ 51.466138][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0
[ 51.471794][ T0] __tsan_read8+0x2c/0x30
[ 51.476116][ T0] tick_do_update_jiffies64+0x2b/0x260
[ 51.481564][ T0] tick_irq_enter+0x139/0x1c0
[ 51.486248][ T0] irq_enter+0x4f/0x60
[ 51.490434][ T0] smp_apic_timer_interrupt+0x55/0x280
[ 51.495875][ T0] ? smp_reschedule_interrupt+0x71/0x1d0
[ 51.501573][ T0] apic_timer_interrupt+0xf/0x20
[ 51.506498][ T0]
[ 51.509554][ T0] RIP: 0010:native_safe_halt+0xe/0x10
[ 51.514930][ T0] 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
[ 51.534611][ T0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 51.543013][ T0] RAX: fbe76c8b4395a344 RBX: ffffffff85a2b780 RCX: 00000000000007b9
[ 51.550962][ T0] RDX: 00000000001db190 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 51.558923][ T0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 51.566872][ T0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000
[ 51.574839][ T0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 51.582994][ T0] ? default_idle+0x50/0x230
[ 51.587585][ T0] arch_cpu_idle+0x1f/0x30
[ 51.591979][ T0] default_idle_call+0x1e/0x40
[ 51.596738][ T0] do_idle+0x1af/0x280
[ 51.601151][ T0] cpu_startup_entry+0x1b/0x20
[ 51.605893][ T0] rest_init+0xec/0xf6
[ 51.609950][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 51.617557][ T0] arch_call_rest_init+0x17/0x37
[ 51.622472][ T0] start_kernel+0x838/0x85e
[ 51.626959][ T0] x86_64_start_reservations+0x29/0x2b
[ 51.632395][ T0] x86_64_start_kernel+0x72/0x76
[ 51.638271][ T0] secondary_startup_64+0xa4/0xb0
[ 51.644707][ T0] Kernel Offset: disabled
[ 51.649038][ T0] Rebooting in 86400 seconds..