[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.122935][ T25] audit: type=1800 audit(1571663417.344:25): pid=7051 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.155113][ T25] audit: type=1800 audit(1571663417.344:26): pid=7051 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.178951][ T25] audit: type=1800 audit(1571663417.344:27): pid=7051 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 '10.128.15.224' (ECDSA) to the list of known hosts. 2019/10/21 13:10:28 fuzzer started 2019/10/21 13:10:30 dialing manager at 10.128.0.105:39747 2019/10/21 13:10:30 syscalls: 2524 2019/10/21 13:10:30 code coverage: enabled 2019/10/21 13:10:30 comparison tracing: enabled 2019/10/21 13:10:30 extra coverage: extra coverage is not supported by the kernel 2019/10/21 13:10:30 setuid sandbox: enabled 2019/10/21 13:10:30 namespace sandbox: enabled 2019/10/21 13:10:30 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 13:10:30 fault injection: enabled 2019/10/21 13:10:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 13:10:30 net packet injection: enabled 2019/10/21 13:10:30 net device setup: enabled 2019/10/21 13:10:30 concurrency sanitizer: enabled syzkaller login: [ 49.803033][ T0] ================================================================== [ 49.811170][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 49.818087][ T0] [ 49.820394][ T0] read to 0xffff88812be1b6e4 of 1 bytes by interrupt on cpu 1: [ 49.827916][ T0] mod_timer+0x5e7/0x7a0 [ 49.832143][ T0] sk_reset_timer+0x2d/0x70 [ 49.836633][ T0] tcp_send_delayed_ack+0x21d/0x2b0 [ 49.841809][ T0] __tcp_ack_snd_check+0x3d1/0x4f0 [ 49.846894][ T0] tcp_rcv_established+0x750/0xf50 [ 49.851992][ T0] tcp_v4_do_rcv+0x381/0x4e0 [ 49.856557][ T0] tcp_v4_rcv+0x19dc/0x1bb0 [ 49.861034][ T0] ip_protocol_deliver_rcu+0x4d/0x420 [ 49.866379][ T0] ip_local_deliver_finish+0x110/0x140 [ 49.871811][ T0] ip_local_deliver+0x133/0x210 [ 49.876634][ T0] ip_rcv_finish+0x121/0x160 [ 49.881197][ T0] ip_rcv+0x18f/0x1a0 [ 49.885155][ T0] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.890847][ T0] __netif_receive_skb+0x37/0xf0 [ 49.895796][ T0] [ 49.898141][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 49.905489][ T0] timer_clear_idle+0x42/0x50 [ 49.910143][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 49.916057][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 49.921211][ T0] do_idle+0xb1/0x280 [ 49.925168][ T0] cpu_startup_entry+0x1b/0x20 [ 49.929922][ T0] rest_init+0xec/0xf6 [ 49.933979][ T0] arch_call_rest_init+0x17/0x37 [ 49.938910][ T0] start_kernel+0x838/0x85e [ 49.943395][ T0] x86_64_start_reservations+0x29/0x2b [ 49.948839][ T0] x86_64_start_kernel+0x72/0x76 [ 49.953756][ T0] secondary_startup_64+0xa4/0xb0 [ 49.958773][ T0] [ 49.961086][ T0] Reported by Kernel Concurrency Sanitizer on: [ 49.967222][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.974357][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.984394][ T0] ================================================================== [ 49.992440][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 49.999137][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 50.006216][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.016244][ T0] Call Trace: [ 50.019519][ T0] dump_stack+0xf5/0x159 [ 50.023742][ T0] panic+0x210/0x640 [ 50.027619][ T0] ? x86_64_start_reservations+0x29/0x2b [ 50.033231][ T0] ? vprintk_func+0x8d/0x140 [ 50.037799][ T0] kcsan_report.cold+0xc/0x10 [ 50.042469][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.048955][ T0] __tsan_write1+0x32/0x40 [ 50.053354][ T0] timer_clear_idle+0x42/0x50 [ 50.058010][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.063880][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.068973][ T0] do_idle+0xb1/0x280 [ 50.072938][ T0] cpu_startup_entry+0x1b/0x20 [ 50.077677][ T0] rest_init+0xec/0xf6 [ 50.081725][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 50.088895][ T0] arch_call_rest_init+0x17/0x37 [ 50.093808][ T0] start_kernel+0x838/0x85e [ 50.098300][ T0] x86_64_start_reservations+0x29/0x2b [ 50.103732][ T0] x86_64_start_kernel+0x72/0x76 [ 50.108647][ T0] secondary_startup_64+0xa4/0xb0 [ 50.114889][ T0] Kernel Offset: disabled [ 50.119212][ T0] Rebooting in 86400 seconds..