[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.408212][ T25] audit: type=1800 audit(1572428299.549:25): 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 [ 36.444770][ T25] audit: type=1800 audit(1572428299.549:26): 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 [ 36.485619][ T25] audit: type=1800 audit(1572428299.549:27): pid=7201 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 '10.128.0.181' (ECDSA) to the list of known hosts. 2019/10/30 09:38:30 fuzzer started 2019/10/30 09:38:31 dialing manager at 10.128.0.105:40771 2019/10/30 09:38:31 syscalls: 2540 2019/10/30 09:38:31 code coverage: enabled 2019/10/30 09:38:31 comparison tracing: enabled 2019/10/30 09:38:31 extra coverage: extra coverage is not supported by the kernel 2019/10/30 09:38:31 setuid sandbox: enabled 2019/10/30 09:38:31 namespace sandbox: enabled 2019/10/30 09:38:31 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/30 09:38:31 fault injection: enabled 2019/10/30 09:38:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/30 09:38:31 net packet injection: enabled 2019/10/30 09:38:31 net device setup: enabled 2019/10/30 09:38:31 concurrency sanitizer: enabled syzkaller login: [ 50.610699][ T0] ================================================================== [ 50.619526][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 50.628020][ T0] [ 50.630697][ T0] read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 50.638229][ T0] tick_sched_do_timer+0x33/0xe0 [ 50.643173][ T0] tick_sched_timer+0x43/0xe0 [ 50.647853][ T0] __hrtimer_run_queues+0x288/0x600 [ 50.653044][ T0] hrtimer_interrupt+0x22a/0x480 [ 50.657971][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.663428][ T0] apic_timer_interrupt+0xf/0x20 [ 50.668364][ T0] __kcsan_setup_watchpoint+0x268/0x4a0 [ 50.673895][ T0] __tsan_read1+0x2c/0x30 [ 50.678220][ T0] kallsyms_expand_symbol.constprop.0+0x103/0x160 [ 50.685072][ T0] kallsyms_lookup_name+0x7f/0x120 [ 50.690649][ T0] debugfs_write+0x122/0x2a0 [ 50.695232][ T0] full_proxy_write+0xbd/0x100 [ 50.699992][ T0] __vfs_write+0x67/0xc0 [ 50.704222][ T0] vfs_write+0x18a/0x390 [ 50.708445][ T0] [ 50.711118][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 50.718518][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 50.724054][ T0] do_idle+0x1a5/0x280 [ 50.729509][ T0] cpu_startup_entry+0x1b/0x20 [ 50.734263][ T0] rest_init+0xec/0xf6 [ 50.738332][ T0] arch_call_rest_init+0x17/0x37 [ 50.743253][ T0] start_kernel+0x838/0x85e [ 50.747742][ T0] x86_64_start_reservations+0x29/0x2b [ 50.753196][ T0] x86_64_start_kernel+0x72/0x76 [ 50.758222][ T0] secondary_startup_64+0xa4/0xb0 [ 50.763439][ T0] [ 50.765751][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.772422][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 50.779527][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.789565][ T0] ================================================================== [ 50.797615][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.804642][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 50.811737][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.822687][ T0] Call Trace: [ 50.825983][ T0] dump_stack+0xf5/0x159 [ 50.830390][ T0] panic+0x210/0x640 [ 50.834306][ T0] ? secondary_startup_64+0xa4/0xb0 [ 50.839511][ T0] ? vprintk_func+0x8d/0x140 [ 50.844122][ T0] kcsan_report.cold+0xc/0x10 [ 50.852023][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.857995][ T0] __tsan_write4+0x32/0x40 [ 50.862589][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 50.868133][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.874375][ T0] do_idle+0x1a5/0x280 [ 50.878451][ T0] cpu_startup_entry+0x1b/0x20 [ 50.883209][ T0] rest_init+0xec/0xf6 [ 50.887281][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 50.894472][ T0] arch_call_rest_init+0x17/0x37 [ 50.899410][ T0] start_kernel+0x838/0x85e [ 50.904433][ T0] x86_64_start_reservations+0x29/0x2b [ 50.909978][ T0] x86_64_start_kernel+0x72/0x76 [ 50.914912][ T0] secondary_startup_64+0xa4/0xb0 [ 51.166401][ T0] Kernel Offset: disabled [ 51.170800][ T0] Rebooting in 86400 seconds..