[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.070285][ T25] audit: type=1800 audit(1571789020.050:25): pid=6930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 40.110343][ T25] audit: type=1800 audit(1571789020.060:26): pid=6930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 40.135816][ T25] audit: type=1800 audit(1571789020.060:27): pid=6930 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 '10.128.0.107' (ECDSA) to the list of known hosts. 2019/10/23 00:03:46 fuzzer started 2019/10/23 00:03:47 dialing manager at 10.128.0.105:33369 2019/10/23 00:03:47 syscalls: 2524 2019/10/23 00:03:47 code coverage: enabled 2019/10/23 00:03:47 comparison tracing: enabled 2019/10/23 00:03:47 extra coverage: extra coverage is not supported by the kernel 2019/10/23 00:03:47 setuid sandbox: enabled 2019/10/23 00:03:47 namespace sandbox: enabled 2019/10/23 00:03:47 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 00:03:47 fault injection: enabled 2019/10/23 00:03:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 00:03:47 net packet injection: enabled 2019/10/23 00:03:47 net device setup: enabled 2019/10/23 00:03:47 concurrency sanitizer: enabled syzkaller login: [ 49.996306][ T0] ================================================================== [ 50.004509][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 50.011436][ T0] [ 50.013769][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7095 on cpu 0: [ 50.021315][ T0] mod_timer+0x50d/0x7a0 [ 50.025652][ T0] sk_reset_timer+0x2d/0x70 [ 50.030274][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 50.035471][ T0] tcp_rearm_rto+0x4f/0x60 [ 50.039888][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.045345][ T0] tcp_write_xmit+0xa16/0x3080 [ 50.050105][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.055655][ T0] tcp_push+0x1e9/0x3d0 [ 50.059873][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 50.065071][ T0] tcp_sendmsg+0x39/0x60 [ 50.069327][ T0] inet_sendmsg+0x6d/0x90 [ 50.073658][ T0] sock_sendmsg+0x9f/0xc0 [ 50.077984][ T0] sock_write_iter+0x16b/0x210 [ 50.082756][ T0] new_sync_write+0x388/0x4a0 [ 50.087422][ T0] [ 50.089748][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 50.097110][ T0] timer_clear_idle+0x42/0x50 [ 50.101784][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.107685][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.112803][ T0] do_idle+0xb1/0x280 [ 50.116837][ T0] cpu_startup_entry+0x1b/0x20 [ 50.121594][ T0] start_secondary+0x208/0x260 [ 50.126364][ T0] secondary_startup_64+0xa4/0xb0 [ 50.131378][ T0] [ 50.133706][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.139885][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 50.147100][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.157156][ T0] ================================================================== [ 50.165209][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.171843][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 50.178948][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.189059][ T0] Call Trace: [ 50.192346][ T0] dump_stack+0xf5/0x159 [ 50.196644][ T0] panic+0x210/0x640 [ 50.200548][ T0] ? vprintk_func+0x8d/0x140 [ 50.205677][ T0] kcsan_report.cold+0xc/0x10 [ 50.210518][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.216081][ T0] __tsan_write1+0x32/0x40 [ 50.220564][ T0] timer_clear_idle+0x42/0x50 [ 50.225246][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.231153][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.236282][ T0] do_idle+0xb1/0x280 [ 50.240270][ T0] ? complete+0x44/0x50 [ 50.244480][ T0] cpu_startup_entry+0x1b/0x20 [ 50.249238][ T0] start_secondary+0x208/0x260 [ 50.254041][ T0] secondary_startup_64+0xa4/0xb0 [ 50.259964][ T0] Kernel Offset: disabled [ 50.264290][ T0] Rebooting in 86400 seconds..