[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 35.887123][ T25] audit: type=1800 audit(1571255613.191:25): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 35.906937][ T25] audit: type=1800 audit(1571255613.191:26): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 35.927198][ T25] audit: type=1800 audit(1571255613.201:27): pid=7090 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 '10.128.10.43' (ECDSA) to the list of known hosts.
2019/10/16 19:53:43 fuzzer started
2019/10/16 19:53:45 dialing manager at 10.128.0.105:33899
2019/10/16 19:53:45 syscalls: 2524
2019/10/16 19:53:45 code coverage: enabled
2019/10/16 19:53:45 comparison tracing: enabled
2019/10/16 19:53:45 extra coverage: extra coverage is not supported by the kernel
2019/10/16 19:53:45 setuid sandbox: enabled
2019/10/16 19:53:45 namespace sandbox: enabled
2019/10/16 19:53:45 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/16 19:53:45 fault injection: enabled
2019/10/16 19:53:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/16 19:53:45 net packet injection: enabled
2019/10/16 19:53:45 net device setup: enabled
2019/10/16 19:53:45 concurrency sanitizer: enabled
syzkaller login: [ 49.630421][ T0] ==================================================================
[ 49.641206][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64
[ 49.651654][ T0]
[ 49.654525][ T0] write to 0xffffffff86042008 of 8 bytes by task 0 on cpu 1:
[ 49.666375][ T0] tick_do_update_jiffies64+0x105/0x260
[ 49.674485][ T0] tick_irq_enter+0x139/0x1c0
[ 49.679564][ T0] irq_enter+0x4f/0x60
[ 49.685101][ T0] do_IRQ+0x51/0x180
[ 49.689020][ T0] ret_from_intr+0x0/0x19
[ 49.694841][ T0] native_safe_halt+0xe/0x10
[ 49.700618][ T0] arch_cpu_idle+0x1f/0x30
[ 49.706755][ T0] default_idle_call+0x1e/0x40
[ 49.713565][ T0] do_idle+0x1af/0x280
[ 49.718560][ T0] cpu_startup_entry+0x1b/0x20
[ 49.725772][ T0] start_secondary+0x208/0x260
[ 49.733127][ T0] secondary_startup_64+0xa4/0xb0
[ 49.739130][ T0]
[ 49.744046][ T0] read to 0xffffffff86042008 of 8 bytes by task 0 on cpu 0:
[ 49.759331][ T0] tick_do_update_jiffies64+0x2b/0x260
[ 49.769511][ T0] tick_irq_enter+0x139/0x1c0
[ 49.775020][ T0] irq_enter+0x4f/0x60
[ 49.780454][ T0] do_IRQ+0x51/0x180
[ 49.785371][ T0] ret_from_intr+0x0/0x19
[ 49.791040][ T0] native_safe_halt+0xe/0x10
[ 49.797068][ T0] arch_cpu_idle+0x1f/0x30
[ 49.803057][ T0] default_idle_call+0x1e/0x40
[ 49.809753][ T0] do_idle+0x1af/0x280
[ 49.814616][ T0] cpu_startup_entry+0x1b/0x20
[ 49.819739][ T0] rest_init+0xec/0xf6
[ 49.824922][ T0] arch_call_rest_init+0x17/0x37
[ 49.831298][ T0] start_kernel+0x838/0x85e
[ 49.836734][ T0]
[ 49.839424][ T0] Reported by Kernel Concurrency Sanitizer on:
[ 49.848264][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 49.856844][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.869225][ T0] ==================================================================
[ 49.882315][ T0] Kernel panic - not syncing: panic_on_warn set ...
[ 49.890299][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0
[ 49.899762][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 49.912648][ T0] Call Trace:
[ 49.916688][ T0]
[ 49.920412][ T0] dump_stack+0xf5/0x159
[ 49.925299][ T0] panic+0x210/0x640
[ 49.931395][ T0] ? do_idle+0x1af/0x280
[ 49.936324][ T0] ? vprintk_func+0x8d/0x140
[ 49.943814][ T0] kcsan_report.cold+0xc/0x1b
[ 49.949741][ T0] __kcsan_setup_watchpoint+0x3ee/0x510
[ 49.956331][ T0] __tsan_read8+0x2c/0x30
[ 49.961465][ T0] tick_do_update_jiffies64+0x2b/0x260
[ 49.967933][ T0] tick_irq_enter+0x139/0x1c0
[ 49.973559][ T0] irq_enter+0x4f/0x60
[ 49.979005][ T0] do_IRQ+0x51/0x180
[ 49.983624][ T0] common_interrupt+0xf/0xf
[ 49.990509][ T0]
[ 49.995355][ T0] RIP: 0010:native_safe_halt+0xe/0x10
[ 50.003066][ 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 52 0a a4 fc e8 2d 86 b8 fd 0f
[ 50.026378][ T0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffd9
[ 50.037175][ T0] RAX: fbe76c8b4395f64e RBX: ffffffff85a2b780 RCX: 00000000000007b8
[ 50.046831][ T0] RDX: 000000000065c6b0 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8
[ 50.056291][ T0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf
[ 50.065914][ T0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000
[ 50.079301][ T0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 50.091542][ T0] ? default_idle+0x50/0x230
[ 50.096373][ T0] arch_cpu_idle+0x1f/0x30
[ 50.100807][ T0] default_idle_call+0x1e/0x40
[ 50.106224][ T0] do_idle+0x1af/0x280
[ 50.111888][ T0] cpu_startup_entry+0x1b/0x20
[ 50.118845][ T0] rest_init+0xec/0xf6
[ 50.125700][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 50.133757][ T0] arch_call_rest_init+0x17/0x37
[ 50.139942][ T0] start_kernel+0x838/0x85e
[ 50.145080][ T0] x86_64_start_reservations+0x29/0x2b
[ 50.151510][ T0] x86_64_start_kernel+0x72/0x76
[ 50.157262][ T0] secondary_startup_64+0xa4/0xb0
[ 50.165737][ T0] Kernel Offset: disabled
[ 50.171582][ T0] Rebooting in 86400 seconds..