[ 35.552478][ T26] audit: type=1800 audit(1570881015.569:24): pid=7201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.025290][ T26] audit: type=1800 audit(1570881016.129:25): pid=7201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.078720][ T26] audit: type=1800 audit(1570881016.129:26): pid=7201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.168' (ECDSA) to the list of known hosts. 2019/10/12 11:50:26 fuzzer started 2019/10/12 11:50:27 dialing manager at 10.128.0.105:43913 2019/10/12 11:50:27 syscalls: 2523 2019/10/12 11:50:27 code coverage: enabled 2019/10/12 11:50:27 comparison tracing: enabled 2019/10/12 11:50:27 extra coverage: extra coverage is not supported by the kernel 2019/10/12 11:50:27 setuid sandbox: enabled 2019/10/12 11:50:27 namespace sandbox: enabled 2019/10/12 11:50:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 11:50:27 fault injection: enabled 2019/10/12 11:50:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 11:50:27 net packet injection: enabled 2019/10/12 11:50:27 net device setup: enabled 2019/10/12 11:50:27 concurrency sanitizer: enabled syzkaller login: [ 47.598767][ T0] ================================================================== [ 47.606922][ T0] BUG: KCSAN: data-race in add_timer_on / timer_clear_idle [ 47.614125][ T0] [ 47.616451][ T0] read to 0xffff88812be1b6e4 of 1 bytes by interrupt on cpu 1: [ 47.624009][ T0] add_timer_on+0x20e/0x2d0 [ 47.628520][ T0] clocksource_watchdog+0x63f/0x760 [ 47.634144][ T0] call_timer_fn+0x5f/0x2f0 [ 47.638652][ T0] run_timer_softirq+0xcd9/0xd20 [ 47.643606][ T0] __do_softirq+0x115/0x33f [ 47.648105][ T0] irq_exit+0xbb/0xe0 [ 47.652459][ T0] smp_apic_timer_interrupt+0xe6/0x280 [ 47.657960][ T0] apic_timer_interrupt+0xf/0x20 [ 47.663024][ T0] __kcsan_setup_watchpoint+0x282/0x510 [ 47.668580][ T0] __tsan_write8+0x32/0x40 [ 47.673011][ T0] generic_exec_single+0xb7/0x2a0 [ 47.678656][ T0] smp_call_function_single+0x118/0x320 [ 47.684225][ T0] smp_call_function_many+0x5f4/0x650 [ 47.689604][ T0] on_each_cpu_mask+0x55/0x150 [ 47.694393][ T0] [ 47.696731][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 47.704122][ T0] timer_clear_idle+0x42/0x50 [ 47.708919][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.715018][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.720142][ T0] do_idle+0xb0/0x2c0 [ 47.724331][ T0] cpu_startup_entry+0x1b/0x20 [ 47.729716][ T0] rest_init+0xec/0xf6 [ 47.734865][ T0] arch_call_rest_init+0x17/0x37 [ 47.739824][ T0] start_kernel+0x83e/0x864 [ 47.744345][ T0] x86_64_start_reservations+0x29/0x2b [ 47.751104][ T0] x86_64_start_kernel+0x72/0x76 [ 47.756305][ T0] secondary_startup_64+0xa4/0xb0 [ 47.761330][ T0] [ 47.763651][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.769800][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.776559][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.786608][ T0] ================================================================== [ 47.794922][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.802111][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.809222][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.819939][ T0] Call Trace: [ 47.823233][ T0] dump_stack+0xf5/0x159 [ 47.827493][ T0] panic+0x209/0x639 [ 47.831391][ T0] ? x86_64_start_reservations+0x29/0x2b [ 47.837036][ T0] ? vprintk_func+0x8d/0x140 [ 47.841625][ T0] kcsan_report.cold+0xc/0x1b [ 47.846314][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.851864][ T0] __tsan_write1+0x32/0x40 [ 47.856273][ T0] timer_clear_idle+0x42/0x50 [ 47.860946][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.866834][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.871941][ T0] do_idle+0xb0/0x2c0 [ 47.875920][ T0] cpu_startup_entry+0x1b/0x20 [ 47.880676][ T0] rest_init+0xec/0xf6 [ 47.884739][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 47.891929][ T0] arch_call_rest_init+0x17/0x37 [ 47.896863][ T0] start_kernel+0x83e/0x864 [ 47.901362][ T0] x86_64_start_reservations+0x29/0x2b [ 47.906827][ T0] x86_64_start_kernel+0x72/0x76 [ 47.911766][ T0] secondary_startup_64+0xa4/0xb0 [ 47.918375][ T0] Kernel Offset: disabled [ 47.922719][ T0] Rebooting in 86400 seconds..