[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.628152][ T25] audit: type=1800 audit(1571718498.786:25): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.655828][ T25] audit: type=1800 audit(1571718498.786:26): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.695503][ T25] audit: type=1800 audit(1571718498.786:27): pid=7081 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 '10.128.0.113' (ECDSA) to the list of known hosts. 2019/10/22 04:28:29 fuzzer started 2019/10/22 04:28:30 dialing manager at 10.128.0.105:37053 2019/10/22 04:28:30 syscalls: 2524 2019/10/22 04:28:30 code coverage: enabled 2019/10/22 04:28:30 comparison tracing: enabled 2019/10/22 04:28:30 extra coverage: extra coverage is not supported by the kernel 2019/10/22 04:28:30 setuid sandbox: enabled 2019/10/22 04:28:30 namespace sandbox: enabled 2019/10/22 04:28:30 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 04:28:30 fault injection: enabled 2019/10/22 04:28:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 04:28:30 net packet injection: enabled 2019/10/22 04:28:30 net device setup: enabled 2019/10/22 04:28:30 concurrency sanitizer: enabled syzkaller login: [ 48.639918][ T0] ================================================================== [ 48.648031][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 48.654945][ T0] [ 48.657259][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7243 on cpu 0: [ 48.664786][ T0] mod_timer+0x50d/0x7a0 [ 48.669012][ T0] sk_reset_timer+0x2d/0x70 [ 48.673507][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 48.678690][ T0] tcp_rearm_rto+0x4f/0x60 [ 48.683099][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 48.688539][ T0] tcp_write_xmit+0xa16/0x3080 [ 48.693279][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 48.698802][ T0] tcp_push+0x1e9/0x3d0 [ 48.702935][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 48.708106][ T0] tcp_sendmsg+0x39/0x60 [ 48.712422][ T0] inet_sendmsg+0x6d/0x90 [ 48.716744][ T0] sock_sendmsg+0x9f/0xc0 [ 48.721056][ T0] sock_write_iter+0x16b/0x210 [ 48.725805][ T0] new_sync_write+0x388/0x4a0 [ 48.730469][ T0] [ 48.732778][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 48.740124][ T0] timer_clear_idle+0x42/0x50 [ 48.744829][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 48.750794][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 48.755882][ T0] do_idle+0xb1/0x280 [ 48.759846][ T0] cpu_startup_entry+0x1b/0x20 [ 48.765211][ T0] start_secondary+0x208/0x260 [ 48.770039][ T0] secondary_startup_64+0xa4/0xb0 [ 48.775559][ T0] [ 48.777870][ T0] Reported by Kernel Concurrency Sanitizer on: [ 48.784360][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 48.791717][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.802581][ T0] ================================================================== [ 48.810626][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 48.817209][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 48.824416][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.834557][ T0] Call Trace: [ 48.838172][ T0] dump_stack+0xf5/0x159 [ 48.842502][ T0] panic+0x210/0x640 [ 48.846399][ T0] ? vprintk_func+0x8d/0x140 [ 48.851439][ T0] kcsan_report.cold+0xc/0x10 [ 48.856220][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.861785][ T0] __tsan_write1+0x32/0x40 [ 48.866202][ T0] timer_clear_idle+0x42/0x50 [ 48.870941][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 48.876843][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 48.881971][ T0] do_idle+0xb1/0x280 [ 48.886743][ T0] ? complete+0x44/0x50 [ 48.891045][ T0] cpu_startup_entry+0x1b/0x20 [ 48.895895][ T0] start_secondary+0x208/0x260 [ 48.900681][ T0] secondary_startup_64+0xa4/0xb0 [ 48.907011][ T0] Kernel Offset: disabled [ 48.911358][ T0] Rebooting in 86400 seconds..