[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.570613][ T25] audit: type=1800 audit(1571141768.767:25): pid=7170 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.620396][ T25] audit: type=1800 audit(1571141768.767:26): pid=7170 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.642111][ T25] audit: type=1800 audit(1571141768.777:27): pid=7170 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 '10.128.1.59' (ECDSA) to the list of known hosts. 2019/10/15 12:16:15 fuzzer started 2019/10/15 12:16:17 dialing manager at 10.128.0.105:38903 2019/10/15 12:16:17 syscalls: 2523 2019/10/15 12:16:17 code coverage: enabled 2019/10/15 12:16:17 comparison tracing: enabled 2019/10/15 12:16:17 extra coverage: extra coverage is not supported by the kernel 2019/10/15 12:16:17 setuid sandbox: enabled 2019/10/15 12:16:17 namespace sandbox: enabled 2019/10/15 12:16:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 12:16:17 fault injection: enabled 2019/10/15 12:16:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 12:16:17 net packet injection: enabled 2019/10/15 12:16:17 net device setup: enabled 2019/10/15 12:16:17 concurrency sanitizer: enabled syzkaller login: [ 46.999832][ T0] ================================================================== [ 47.008060][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 47.014983][ T0] [ 47.017291][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7340 on cpu 1: [ 47.024829][ T0] mod_timer+0x50d/0x7a0 [ 47.029060][ T0] sk_reset_timer+0x2d/0x70 [ 47.033540][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 47.038726][ T0] tcp_rearm_rto+0x4f/0x60 [ 47.043130][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 47.048567][ T0] tcp_write_xmit+0xa16/0x3080 [ 47.053305][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 47.058824][ T0] tcp_push+0x1e9/0x3d0 [ 47.062954][ T0] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 47.068125][ T0] tcp_sendmsg+0x39/0x60 [ 47.072360][ T0] inet_sendmsg+0x6d/0x90 [ 47.076665][ T0] sock_sendmsg+0x9f/0xc0 [ 47.080980][ T0] sock_write_iter+0x16b/0x210 [ 47.085720][ T0] new_sync_write+0x388/0x4a0 [ 47.090366][ T0] [ 47.092674][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 47.100028][ T0] timer_clear_idle+0x42/0x50 [ 47.104711][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.110589][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.115676][ T0] do_idle+0xb0/0x2c0 [ 47.119636][ T0] cpu_startup_entry+0x1b/0x20 [ 47.124374][ T0] rest_init+0xec/0xf6 [ 47.128432][ T0] arch_call_rest_init+0x17/0x37 [ 47.133358][ T0] start_kernel+0x83e/0x864 [ 47.137848][ T0] x86_64_start_reservations+0x29/0x2b [ 47.143284][ T0] x86_64_start_kernel+0x72/0x76 [ 47.148198][ T0] secondary_startup_64+0xa4/0xb0 [ 47.153190][ T0] [ 47.155493][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.161632][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.168365][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.178401][ T0] ================================================================== [ 47.186466][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.193028][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.199763][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.209791][ T0] Call Trace: [ 47.213060][ T0] dump_stack+0xf5/0x159 [ 47.217284][ T0] panic+0x209/0x639 [ 47.221161][ T0] ? x86_64_start_reservations+0x29/0x2b [ 47.226785][ T0] ? vprintk_func+0x8d/0x140 [ 47.231415][ T0] kcsan_report.cold+0xc/0x1b [ 47.236083][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.241612][ T0] __tsan_write1+0x32/0x40 [ 47.246017][ T0] timer_clear_idle+0x42/0x50 [ 47.250849][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.256732][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.261830][ T0] do_idle+0xb0/0x2c0 [ 47.265808][ T0] cpu_startup_entry+0x1b/0x20 [ 47.270551][ T0] rest_init+0xec/0xf6 [ 47.274599][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 47.281771][ T0] arch_call_rest_init+0x17/0x37 [ 47.286689][ T0] start_kernel+0x83e/0x864 [ 47.291359][ T0] x86_64_start_reservations+0x29/0x2b [ 47.296797][ T0] x86_64_start_kernel+0x72/0x76 [ 47.301713][ T0] secondary_startup_64+0xa4/0xb0 [ 47.308120][ T0] Kernel Offset: disabled [ 47.312443][ T0] Rebooting in 86400 seconds..