[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.173749][ T26] audit: type=1800 audit(1570922638.969:25): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.193681][ T26] audit: type=1800 audit(1570922638.969:26): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.215382][ T26] audit: type=1800 audit(1570922638.969:27): pid=7107 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 '10.128.0.17' (ECDSA) to the list of known hosts. 2019/10/12 23:24:06 fuzzer started 2019/10/12 23:24:07 dialing manager at 10.128.0.105:43913 2019/10/12 23:24:07 syscalls: 2523 2019/10/12 23:24:07 code coverage: enabled 2019/10/12 23:24:07 comparison tracing: enabled 2019/10/12 23:24:07 extra coverage: extra coverage is not supported by the kernel 2019/10/12 23:24:07 setuid sandbox: enabled 2019/10/12 23:24:07 namespace sandbox: enabled 2019/10/12 23:24:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 23:24:07 fault injection: enabled 2019/10/12 23:24:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 23:24:07 net packet injection: enabled 2019/10/12 23:24:07 net device setup: enabled 2019/10/12 23:24:07 concurrency sanitizer: enabled syzkaller login: [ 44.822256][ T0] ================================================================== [ 44.830394][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 44.838882][ T0] [ 44.841222][ T0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 44.848769][ T0] tick_sched_do_timer+0x33/0xe0 [ 44.853710][ T0] tick_sched_timer+0x43/0xe0 [ 44.858388][ T0] __hrtimer_run_queues+0x288/0x600 [ 44.863594][ T0] hrtimer_interrupt+0x22a/0x480 [ 44.868532][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.873985][ T0] apic_timer_interrupt+0xf/0x20 [ 44.878932][ T0] get_page_from_freelist+0x414/0x2300 [ 44.884392][ T0] __alloc_pages_nodemask+0x255/0x4d0 [ 44.889757][ T0] alloc_pages_vma+0x15b/0x2b0 [ 44.894521][ T0] wp_page_copy+0xb33/0xf40 [ 44.899021][ T0] do_wp_page+0x192/0xd00 [ 44.903343][ T0] __handle_mm_fault+0x1c3d/0x2d00 [ 44.908455][ T0] handle_mm_fault+0x21b/0x520 [ 44.913215][ T0] __do_page_fault+0x3fb/0x9e0 [ 44.918022][ T0] [ 44.920342][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 44.927746][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 44.933286][ T0] do_idle+0x1e0/0x2c0 [ 44.937348][ T0] cpu_startup_entry+0x1b/0x20 [ 44.942656][ T0] rest_init+0xec/0xf6 [ 44.946831][ T0] arch_call_rest_init+0x17/0x37 [ 44.951871][ T0] start_kernel+0x83e/0x864 [ 44.956380][ T0] x86_64_start_reservations+0x29/0x2b [ 44.961837][ T0] x86_64_start_kernel+0x72/0x76 [ 44.966873][ T0] secondary_startup_64+0xa4/0xb0 [ 44.971948][ T0] [ 44.974281][ T0] Reported by Kernel Concurrency Sanitizer on: [ 44.980420][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 44.987174][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.997261][ T0] ================================================================== [ 45.005312][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.011898][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 45.018640][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.028673][ T0] Call Trace: [ 45.031962][ T0] dump_stack+0xf5/0x159 [ 45.036192][ T0] panic+0x209/0x639 [ 45.040070][ T0] ? secondary_startup_64+0xa4/0xb0 [ 45.045253][ T0] ? vprintk_func+0x8d/0x140 [ 45.049861][ T0] kcsan_report.cold+0xc/0x1b [ 45.054530][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.060075][ T0] __tsan_write4+0x32/0x40 [ 45.064480][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.070022][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.076339][ T0] do_idle+0x1e0/0x2c0 [ 45.080394][ T0] cpu_startup_entry+0x1b/0x20 [ 45.085136][ T0] rest_init+0xec/0xf6 [ 45.089197][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 45.096932][ T0] arch_call_rest_init+0x17/0x37 [ 45.101864][ T0] start_kernel+0x83e/0x864 [ 45.106366][ T0] x86_64_start_reservations+0x29/0x2b [ 45.111818][ T0] x86_64_start_kernel+0x72/0x76 [ 45.116746][ T0] secondary_startup_64+0xa4/0xb0 [ 45.123252][ T0] Kernel Offset: disabled [ 45.127599][ T0] Rebooting in 86400 seconds..