[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.141691][ T26] audit: type=1800 audit(1570877083.126:25): pid=7077 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.168958][ T26] audit: type=1800 audit(1570877083.126:26): pid=7077 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.195691][ T26] audit: type=1800 audit(1570877083.126:27): pid=7077 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[ 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 '10.128.0.131' (ECDSA) to the list of known hosts. 2019/10/12 10:44:53 fuzzer started 2019/10/12 10:44:55 dialing manager at 10.128.0.105:43913 2019/10/12 10:44:55 syscalls: 2523 2019/10/12 10:44:55 code coverage: enabled 2019/10/12 10:44:55 comparison tracing: enabled 2019/10/12 10:44:55 extra coverage: extra coverage is not supported by the kernel 2019/10/12 10:44:55 setuid sandbox: enabled 2019/10/12 10:44:55 namespace sandbox: enabled 2019/10/12 10:44:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 10:44:55 fault injection: enabled 2019/10/12 10:44:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 10:44:55 net packet injection: enabled 2019/10/12 10:44:55 net device setup: enabled 2019/10/12 10:44:55 concurrency sanitizer: enabled syzkaller login: [ 47.477491][ T0] ================================================================== [ 47.485643][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 47.493830][ T0] [ 47.496153][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 47.503776][ T0] tick_sched_do_timer+0xc0/0xe0 [ 47.508833][ T0] tick_sched_timer+0x43/0xe0 [ 47.513761][ T0] __hrtimer_run_queues+0x288/0x600 [ 47.519036][ T0] hrtimer_interrupt+0x22a/0x480 [ 47.525371][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 47.530853][ T0] apic_timer_interrupt+0xf/0x20 [ 47.535791][ T0] [ 47.538128][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 47.545398][ T0] tick_nohz_next_event+0x1a4/0x380 [ 47.550777][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 47.556534][ T0] do_idle+0x1e0/0x2c0 [ 47.560592][ T0] cpu_startup_entry+0x1b/0x20 [ 47.565873][ T0] rest_init+0xec/0xf6 [ 47.570222][ T0] arch_call_rest_init+0x17/0x37 [ 47.575148][ T0] start_kernel+0x83e/0x864 [ 47.579641][ T0] x86_64_start_reservations+0x29/0x2b [ 47.585097][ T0] x86_64_start_kernel+0x72/0x76 [ 47.590301][ T0] secondary_startup_64+0xa4/0xb0 [ 47.595322][ T0] [ 47.597639][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.603794][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.610534][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.620576][ T0] ================================================================== [ 47.628619][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.635188][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.642372][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.652670][ T0] Call Trace: [ 47.655967][ T0] dump_stack+0xf5/0x159 [ 47.661162][ T0] panic+0x209/0x639 [ 47.665056][ T0] ? x86_64_start_kernel+0x72/0x76 [ 47.670169][ T0] ? vprintk_func+0x8d/0x140 [ 47.674766][ T0] kcsan_report.cold+0xc/0x1b [ 47.679705][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.685304][ T0] __tsan_read4+0x2c/0x30 [ 47.689806][ T0] tick_nohz_next_event+0x1a4/0x380 [ 47.695007][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 47.700559][ T0] ? __tsan_read4+0x2c/0x30 [ 47.705064][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.711304][ T0] do_idle+0x1e0/0x2c0 [ 47.715773][ T0] cpu_startup_entry+0x1b/0x20 [ 47.720545][ T0] rest_init+0xec/0xf6 [ 47.724743][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 47.732774][ T0] arch_call_rest_init+0x17/0x37 [ 47.737716][ T0] start_kernel+0x83e/0x864 [ 47.742210][ T0] x86_64_start_reservations+0x29/0x2b [ 47.747658][ T0] x86_64_start_kernel+0x72/0x76 [ 47.752592][ T0] secondary_startup_64+0xa4/0xb0 [ 47.758336][ T0] Kernel Offset: disabled [ 47.762765][ T0] Rebooting in 86400 seconds..