[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.868504][ T26] audit: type=1800 audit(1570470120.029:25): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.912180][ T26] audit: type=1800 audit(1570470120.029:26): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.933672][ T26] audit: type=1800 audit(1570470120.029:27): pid=7043 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 '10.128.0.79' (ECDSA) to the list of known hosts. 2019/10/07 17:42:10 fuzzer started 2019/10/07 17:42:11 dialing manager at 10.128.0.105:39369 2019/10/07 17:42:11 syscalls: 2523 2019/10/07 17:42:11 code coverage: enabled 2019/10/07 17:42:11 comparison tracing: enabled 2019/10/07 17:42:11 extra coverage: extra coverage is not supported by the kernel 2019/10/07 17:42:11 setuid sandbox: enabled 2019/10/07 17:42:11 namespace sandbox: enabled 2019/10/07 17:42:11 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/07 17:42:11 fault injection: enabled 2019/10/07 17:42:11 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/07 17:42:11 net packet injection: enabled 2019/10/07 17:42:11 net device setup: enabled 2019/10/07 17:42:11 concurrency sanitizer: enabled syzkaller login: [ 56.542869][ T0] ================================================================== [ 56.551662][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 56.558579][ T0] [ 56.560886][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7195 on cpu 1: [ 56.568419][ T0] mod_timer+0x50d/0x7a0 [ 56.572656][ T0] sk_reset_timer+0x2d/0x70 [ 56.577162][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 56.583061][ T0] tcp_rearm_rto+0x4f/0x60 [ 56.587477][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 56.593053][ T0] tcp_write_xmit+0xa16/0x3080 [ 56.598085][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 56.604473][ T0] tcp_push+0x1e9/0x3d0 [ 56.608678][ T0] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 56.613997][ T0] tcp_sendmsg+0x39/0x60 [ 56.618584][ T0] inet_sendmsg+0x6d/0x90 [ 56.622893][ T0] sock_sendmsg+0x9f/0xc0 [ 56.627203][ T0] sock_write_iter+0x16b/0x210 [ 56.631945][ T0] new_sync_write+0x388/0x4a0 [ 56.636594][ T0] [ 56.638925][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 56.646287][ T0] timer_clear_idle+0x42/0x50 [ 56.650950][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 56.656904][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 56.662011][ T0] do_idle+0xb0/0x2c0 [ 56.666023][ T0] cpu_startup_entry+0x1b/0x20 [ 56.670793][ T0] rest_init+0xec/0xf6 [ 56.675111][ T0] arch_call_rest_init+0x17/0x37 [ 56.680335][ T0] start_kernel+0x83e/0x864 [ 56.685324][ T0] x86_64_start_reservations+0x29/0x2b [ 56.690771][ T0] x86_64_start_kernel+0x72/0x76 [ 56.695801][ T0] secondary_startup_64+0xa4/0xb0 [ 56.700807][ T0] [ 56.703137][ T0] Reported by Kernel Concurrency Sanitizer on: [ 56.709278][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 56.716017][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.726056][ T0] ================================================================== [ 56.734264][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 56.740833][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 56.747595][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.757713][ T0] Call Trace: [ 56.761007][ T0] dump_stack+0xf5/0x159 [ 56.765235][ T0] panic+0x209/0x639 [ 56.769112][ T0] ? vprintk_func+0x8d/0x140 [ 56.773682][ T0] kcsan_report.cold+0x57/0xeb [ 56.778446][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 56.783970][ T0] __tsan_write1+0x32/0x40 [ 56.788378][ T0] timer_clear_idle+0x42/0x50 [ 56.793468][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 56.799427][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 56.804559][ T0] do_idle+0xb0/0x2c0 [ 56.808531][ T0] cpu_startup_entry+0x1b/0x20 [ 56.813296][ T0] rest_init+0xec/0xf6 [ 56.817465][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 56.824645][ T0] arch_call_rest_init+0x17/0x37 [ 56.829563][ T0] start_kernel+0x83e/0x864 [ 56.834057][ T0] x86_64_start_reservations+0x29/0x2b [ 56.839609][ T0] x86_64_start_kernel+0x72/0x76 [ 56.844541][ T0] secondary_startup_64+0xa4/0xb0 [ 56.851023][ T0] Kernel Offset: disabled [ 56.855386][ T0] Rebooting in 86400 seconds..