[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.156' (ECDSA) to the list of known hosts.
2020/06/04 01:04:24 fuzzer started
2020/06/04 01:04:24 dialing manager at 10.128.0.105:35977
2020/06/04 01:04:24 syscalls: 3055
2020/06/04 01:04:24 code coverage: enabled
2020/06/04 01:04:24 comparison tracing: enabled
2020/06/04 01:04:24 extra coverage: enabled
2020/06/04 01:04:24 setuid sandbox: enabled
2020/06/04 01:04:24 namespace sandbox: enabled
2020/06/04 01:04:24 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/04 01:04:24 fault injection: enabled
2020/06/04 01:04:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/04 01:04:24 net packet injection: enabled
2020/06/04 01:04:24 net device setup: enabled
2020/06/04 01:04:24 concurrency sanitizer: enabled
2020/06/04 01:04:24 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/04 01:04:24 USB emulation: enabled
2020/06/04 01:04:25 adding functions to KCSAN blacklist: 'run_timer_softirq' 'pcpu_alloc' 'ep_poll' 'ext4_free_inodes_count'
syzkaller login: [ 57.152004][ C0] ==================================================================
[ 57.160288][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer
[ 57.168531][ C0]
[ 57.170851][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1:
[ 57.178591][ C0] tick_sched_do_timer+0xb4/0xd0
[ 57.184933][ C0] tick_sched_timer+0x3f/0xd0
[ 57.189597][ C0] __hrtimer_run_queues+0x271/0x600
[ 57.195822][ C0] hrtimer_interrupt+0x226/0x490
[ 57.201403][ C0] smp_apic_timer_interrupt+0xd8/0x270
[ 57.208424][ C0] apic_timer_interrupt+0xf/0x20
[ 57.214184][ C0]
[ 57.216518][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0:
[ 57.224285][ C0] tick_sched_do_timer+0x2e/0xd0
[ 57.229306][ C0] tick_sched_timer+0x3f/0xd0
[ 57.233988][ C0] __hrtimer_run_queues+0x271/0x600
[ 57.239171][ C0] hrtimer_interrupt+0x226/0x490
[ 57.244545][ C0] smp_apic_timer_interrupt+0xd8/0x270
[ 57.250271][ C0] apic_timer_interrupt+0xf/0x20
[ 57.255185][ C0] native_safe_halt+0xe/0x10
[ 57.259756][ C0] default_idle+0x21/0x170
[ 57.264725][ C0] do_idle+0x1b7/0x290
[ 57.269202][ C0] cpu_startup_entry+0x14/0x20
[ 57.273955][ C0] rest_init+0xe4/0xeb
[ 57.278004][ C0] arch_call_rest_init+0x13/0x2b
[ 57.282947][ C0] start_kernel+0x7fe/0x823
[ 57.287549][ C0] secondary_startup_64+0xa4/0xb0
[ 57.292660][ C0]
[ 57.295808][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 57.302621][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 57.310690][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 57.320823][ C0] ==================================================================
[ 57.329149][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 57.336848][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 57.345883][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 57.356066][ C0] Call Trace:
[ 57.359348][ C0]
[ 57.362193][ C0] dump_stack+0x11d/0x187
[ 57.366792][ C0] panic+0x210/0x640
[ 57.371296][ C0] ? vprintk_func+0x89/0x13a
[ 57.376171][ C0] kcsan_report.cold+0xc/0x1a
[ 57.380857][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 57.386570][ C0] tick_sched_do_timer+0x2e/0xd0
[ 57.391501][ C0] tick_sched_timer+0x3f/0xd0
[ 57.396161][ C0] __hrtimer_run_queues+0x271/0x600
[ 57.401337][ C0] ? tick_sched_do_timer+0xd0/0xd0
[ 57.406456][ C0] hrtimer_interrupt+0x226/0x490
[ 57.411811][ C0] ? kvm_clock_read+0x14/0x30
[ 57.416566][ C0] smp_apic_timer_interrupt+0xd8/0x270
[ 57.422018][ C0] apic_timer_interrupt+0xf/0x20
[ 57.427357][ C0]
[ 57.430446][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 57.436235][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 0c d6 58 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d fc d5 58 00 fb f4 cc 41 54 55 53 e8 97 b2 71 fb e8 a2 21 bc fc 0f 1f 44 00 00 48
[ 57.456869][ C0] RSP: 0018:ffffffff87203e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[ 57.465262][ C0] RAX: 0000000000000000 RBX: ffffffff8722b840 RCX: ffffffff8285fdf1
[ 57.473478][ C0] RDX: 0000000000000000 RSI: ffffffff8285fdfa RDI: 0000000000000005
[ 57.486912][ C0] RBP: 0000000000000000 R08: ffffffff8722b840 R09: 0000ffff87047920
[ 57.495142][ C0] R10: 0000ffff87203e58 R11: 0000ffff87047927 R12: ffffffff8722b840
[ 57.503118][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8722b840
[ 57.511093][ C0] ? debug_smp_processor_id+0x31/0x129
[ 57.516525][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 57.522854][ C0] default_idle+0x21/0x170
[ 57.527261][ C0] do_idle+0x1b7/0x290
[ 57.531338][ C0] ? debug_smp_processor_id+0x3f/0x129
[ 57.537232][ C0] cpu_startup_entry+0x14/0x20
[ 57.542599][ C0] rest_init+0xe4/0xeb
[ 57.546753][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[ 57.553031][ C0] arch_call_rest_init+0x13/0x2b
[ 57.558054][ C0] start_kernel+0x7fe/0x823
[ 57.562538][ C0] secondary_startup_64+0xa4/0xb0
[ 57.569108][ C0] Kernel Offset: disabled
[ 57.573528][ C0] Rebooting in 86400 seconds..