[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.203034][ T26] audit: type=1800 audit(1570502009.753:25): 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 [ 41.258164][ T26] audit: type=1800 audit(1570502009.763:26): 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 [ 41.283557][ T26] audit: type=1800 audit(1570502009.763:27): 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 '10.128.0.149' (ECDSA) to the list of known hosts. 2019/10/08 02:33:40 fuzzer started 2019/10/08 02:33:41 dialing manager at 10.128.0.105:39369 2019/10/08 02:33:41 syscalls: 2523 2019/10/08 02:33:41 code coverage: enabled 2019/10/08 02:33:41 comparison tracing: enabled 2019/10/08 02:33:41 extra coverage: extra coverage is not supported by the kernel 2019/10/08 02:33:41 setuid sandbox: enabled 2019/10/08 02:33:41 namespace sandbox: enabled 2019/10/08 02:33:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 02:33:41 fault injection: enabled 2019/10/08 02:33:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 02:33:41 net packet injection: enabled 2019/10/08 02:33:41 net device setup: enabled 2019/10/08 02:33:41 concurrency sanitizer: enabled syzkaller login: [ 53.974755][ T0] ================================================================== [ 53.982967][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 53.989974][ T0] [ 53.992283][ T0] read to 0xffff88812be1b6e4 of 1 bytes by interrupt on cpu 1: [ 53.999858][ T0] mod_timer+0x50d/0x7a0 [ 54.004078][ T0] sk_reset_timer+0x2d/0x70 [ 54.008559][ T0] tcp_send_delayed_ack+0x21d/0x2b0 [ 54.013931][ T0] __tcp_ack_snd_check+0x3c8/0x4e0 [ 54.019055][ T0] tcp_rcv_established+0x750/0xf50 [ 54.024148][ T0] tcp_v4_do_rcv+0x381/0x4e0 [ 54.028711][ T0] tcp_v4_rcv+0x1a03/0x1bf0 [ 54.033205][ T0] ip_protocol_deliver_rcu+0x51/0x470 [ 54.038553][ T0] ip_local_deliver_finish+0x110/0x140 [ 54.043995][ T0] ip_local_deliver+0x133/0x210 [ 54.048906][ T0] ip_rcv_finish+0x121/0x160 [ 54.053472][ T0] ip_rcv+0x18f/0x1a0 [ 54.057808][ T0] __netif_receive_skb_one_core+0xa7/0xe0 [ 54.063520][ T0] __netif_receive_skb+0x37/0xf0 [ 54.068435][ T0] [ 54.070754][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 54.089567][ T0] timer_clear_idle+0x42/0x50 [ 54.094227][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.100101][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.105195][ T0] do_idle+0xb0/0x2c0 [ 54.109174][ T0] cpu_startup_entry+0x1b/0x20 [ 54.113917][ T0] rest_init+0xec/0xf6 [ 54.117979][ T0] arch_call_rest_init+0x17/0x37 [ 54.122893][ T0] start_kernel+0x83e/0x864 [ 54.127373][ T0] x86_64_start_reservations+0x29/0x2b [ 54.132809][ T0] x86_64_start_kernel+0x72/0x76 [ 54.137726][ T0] secondary_startup_64+0xa4/0xb0 [ 54.142762][ T0] [ 54.145063][ T0] Reported by Kernel Concurrency Sanitizer on: [ 54.151272][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 54.158028][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.168063][ T0] ================================================================== [ 54.176099][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 54.182674][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 54.189414][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.199452][ T0] Call Trace: [ 54.202730][ T0] dump_stack+0xf5/0x159 [ 54.206954][ T0] panic+0x209/0x639 [ 54.210838][ T0] ? vprintk_func+0x8d/0x140 [ 54.215406][ T0] kcsan_report.cold+0x57/0xeb [ 54.220149][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 54.225669][ T0] __tsan_write1+0x32/0x40 [ 54.230062][ T0] timer_clear_idle+0x42/0x50 [ 54.234717][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.240586][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.245691][ T0] do_idle+0xb0/0x2c0 [ 54.249651][ T0] cpu_startup_entry+0x1b/0x20 [ 54.254388][ T0] rest_init+0xec/0xf6 [ 54.259132][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 54.266399][ T0] arch_call_rest_init+0x17/0x37 [ 54.271332][ T0] start_kernel+0x83e/0x864 [ 54.275822][ T0] x86_64_start_reservations+0x29/0x2b [ 54.281258][ T0] x86_64_start_kernel+0x72/0x76 [ 54.286210][ T0] secondary_startup_64+0xa4/0xb0 [ 54.292589][ T0] Kernel Offset: disabled [ 54.296911][ T0] Rebooting in 86400 seconds..