[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.578994][ T26] audit: type=1800 audit(1570784277.312:25): pid=7178 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.606821][ T26] audit: type=1800 audit(1570784277.312:26): pid=7178 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.647582][ T26] audit: type=1800 audit(1570784277.312:27): pid=7178 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 '10.128.0.209' (ECDSA) to the list of known hosts. 2019/10/11 08:58:05 fuzzer started 2019/10/11 08:58:06 dialing manager at 10.128.0.105:37331 2019/10/11 08:58:06 syscalls: 2523 2019/10/11 08:58:06 code coverage: enabled 2019/10/11 08:58:06 comparison tracing: enabled 2019/10/11 08:58:06 extra coverage: extra coverage is not supported by the kernel 2019/10/11 08:58:06 setuid sandbox: enabled 2019/10/11 08:58:06 namespace sandbox: enabled 2019/10/11 08:58:06 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 08:58:06 fault injection: enabled 2019/10/11 08:58:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 08:58:06 net packet injection: enabled 2019/10/11 08:58:06 net device setup: enabled 2019/10/11 08:58:06 concurrency sanitizer: enabled syzkaller login: [ 54.560151][ T0] ================================================================== [ 54.568460][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 54.575493][ T0] [ 54.577809][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7343 on cpu 1: [ 54.585709][ T0] mod_timer+0x50d/0x7a0 [ 54.590198][ T0] sk_reset_timer+0x2d/0x70 [ 54.595201][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 54.601439][ T0] tcp_rearm_rto+0x4f/0x60 [ 54.605837][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 54.611272][ T0] tcp_write_xmit+0xa16/0x3080 [ 54.616098][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 54.621618][ T0] tcp_push+0x1e9/0x3d0 [ 54.625759][ T0] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 54.630938][ T0] tcp_sendmsg+0x39/0x60 [ 54.635181][ T0] inet_sendmsg+0x6d/0x90 [ 54.639587][ T0] sock_sendmsg+0x9f/0xc0 [ 54.643905][ T0] sock_write_iter+0x16b/0x210 [ 54.648652][ T0] new_sync_write+0x388/0x4a0 [ 54.653314][ T0] [ 54.655641][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 54.662993][ T0] timer_clear_idle+0x42/0x50 [ 54.667654][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.673543][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.678642][ T0] do_idle+0xb0/0x2c0 [ 54.682606][ T0] cpu_startup_entry+0x1b/0x20 [ 54.687355][ T0] rest_init+0xec/0xf6 [ 54.691411][ T0] arch_call_rest_init+0x17/0x37 [ 54.696362][ T0] start_kernel+0x83e/0x864 [ 54.701469][ T0] x86_64_start_reservations+0x29/0x2b [ 54.707017][ T0] x86_64_start_kernel+0x72/0x76 [ 54.712115][ T0] secondary_startup_64+0xa4/0xb0 [ 54.717131][ T0] [ 54.719444][ T0] Reported by Kernel Concurrency Sanitizer on: [ 54.725688][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 54.732447][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.743537][ T0] ================================================================== [ 54.752314][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 54.758897][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 54.766000][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.776034][ T0] Call Trace: [ 54.779407][ T0] dump_stack+0xf5/0x159 [ 54.784500][ T0] panic+0x209/0x639 [ 54.788395][ T0] ? x86_64_start_reservations+0x29/0x2b [ 54.794375][ T0] ? vprintk_func+0x8d/0x140 [ 54.799136][ T0] kcsan_report.cold+0xc/0x1b [ 54.803792][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 54.809324][ T0] __tsan_write1+0x32/0x40 [ 54.813725][ T0] timer_clear_idle+0x42/0x50 [ 54.818381][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.824265][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.829497][ T0] do_idle+0xb0/0x2c0 [ 54.833476][ T0] cpu_startup_entry+0x1b/0x20 [ 54.838227][ T0] rest_init+0xec/0xf6 [ 54.842288][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 54.849485][ T0] arch_call_rest_init+0x17/0x37 [ 54.854424][ T0] start_kernel+0x83e/0x864 [ 54.858934][ T0] x86_64_start_reservations+0x29/0x2b [ 54.864377][ T0] x86_64_start_kernel+0x72/0x76 [ 54.869294][ T0] secondary_startup_64+0xa4/0xb0 [ 54.876031][ T0] Kernel Offset: disabled [ 54.880530][ T0] Rebooting in 86400 seconds..