[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.883304][ T25] audit: type=1800 audit(1570710551.668:25): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.902985][ T25] audit: type=1800 audit(1570710551.668:26): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.987804][ T25] audit: type=1800 audit(1570710551.768:27): pid=7061 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 '10.128.10.48' (ECDSA) to the list of known hosts. 2019/10/10 12:29:22 fuzzer started 2019/10/10 12:29:23 dialing manager at 10.128.0.105:34287 2019/10/10 12:29:23 syscalls: 2523 2019/10/10 12:29:23 code coverage: enabled 2019/10/10 12:29:23 comparison tracing: enabled 2019/10/10 12:29:23 extra coverage: extra coverage is not supported by the kernel 2019/10/10 12:29:23 setuid sandbox: enabled 2019/10/10 12:29:23 namespace sandbox: enabled 2019/10/10 12:29:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 12:29:23 fault injection: enabled 2019/10/10 12:29:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 12:29:23 net packet injection: enabled 2019/10/10 12:29:23 net device setup: enabled 2019/10/10 12:29:23 concurrency sanitizer: enabled syzkaller login: [ 45.947856][ T0] ================================================================== [ 45.956155][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 45.964485][ T0] [ 45.967025][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 45.975722][ T0] tick_sched_do_timer+0xc0/0xe0 [ 45.980651][ T0] tick_sched_timer+0x43/0xe0 [ 45.985405][ T0] __hrtimer_run_queues+0x288/0x600 [ 45.990622][ T0] hrtimer_interrupt+0x22a/0x480 [ 45.995547][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.001180][ T0] apic_timer_interrupt+0xf/0x20 [ 46.006484][ T0] __sanitizer_cov_trace_pc+0x0/0x50 [ 46.011803][ T0] tcp_rcv_established+0xbfe/0xf50 [ 46.016907][ T0] tcp_v4_do_rcv+0x381/0x4e0 [ 46.021948][ T0] tcp_v4_rcv+0x1a03/0x1bf0 [ 46.026470][ T0] ip_protocol_deliver_rcu+0x51/0x470 [ 46.031826][ T0] ip_local_deliver_finish+0x110/0x140 [ 46.037277][ T0] ip_local_deliver+0x133/0x210 [ 46.042193][ T0] ip_rcv_finish+0x121/0x160 [ 46.046806][ T0] [ 46.049126][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 46.056616][ T0] tick_nohz_next_event+0x1a4/0x380 [ 46.061838][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 46.067368][ T0] do_idle+0x1e0/0x2c0 [ 46.071432][ T0] cpu_startup_entry+0x1b/0x20 [ 46.076195][ T0] start_secondary+0x207/0x260 [ 46.080948][ T0] secondary_startup_64+0xa4/0xb0 [ 46.086001][ T0] [ 46.088313][ T0] Reported by Kernel Concurrency Sanitizer on: [ 46.094481][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.101224][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.111349][ T0] ================================================================== [ 46.119513][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 46.126294][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.133074][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.143201][ T0] Call Trace: [ 46.146514][ T0] dump_stack+0xf5/0x159 [ 46.150752][ T0] panic+0x209/0x639 [ 46.154668][ T0] ? vprintk_func+0x8d/0x140 [ 46.159246][ T0] kcsan_report.cold+0xc/0x1b [ 46.164107][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.169673][ T0] __tsan_read4+0x2c/0x30 [ 46.173992][ T0] tick_nohz_next_event+0x1a4/0x380 [ 46.179181][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 46.185249][ T0] ? __tsan_read4+0x2c/0x30 [ 46.189757][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.195995][ T0] do_idle+0x1e0/0x2c0 [ 46.200458][ T0] ? complete+0x44/0x50 [ 46.204749][ T0] cpu_startup_entry+0x1b/0x20 [ 46.209506][ T0] start_secondary+0x207/0x260 [ 46.214261][ T0] secondary_startup_64+0xa4/0xb0 [ 46.220956][ T0] Kernel Offset: disabled [ 46.225379][ T0] Rebooting in 86400 seconds..