[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.126568][ T26] audit: type=1800 audit(1572046888.947:25): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.168338][ T26] audit: type=1800 audit(1572046888.947:26): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.192650][ T26] audit: type=1800 audit(1572046888.947:27): pid=7066 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 '10.128.0.90' (ECDSA) to the list of known hosts. 2019/10/25 23:41:39 fuzzer started 2019/10/25 23:41:41 dialing manager at 10.128.0.105:32811 2019/10/25 23:41:41 syscalls: 2533 2019/10/25 23:41:41 code coverage: enabled 2019/10/25 23:41:41 comparison tracing: enabled 2019/10/25 23:41:41 extra coverage: extra coverage is not supported by the kernel 2019/10/25 23:41:41 setuid sandbox: enabled 2019/10/25 23:41:41 namespace sandbox: enabled 2019/10/25 23:41:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/25 23:41:41 fault injection: enabled 2019/10/25 23:41:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/25 23:41:41 net packet injection: enabled 2019/10/25 23:41:41 net device setup: enabled 2019/10/25 23:41:41 concurrency sanitizer: enabled 2019/10/25 23:41:43 adding functions to KCSAN blacklist: 'common_perm_cond' 'echo_char' 'tcp_add_backlog' 'tomoyo_supervisor' 'pid_update_inode' '__tcp_select_window' 'generic_permission' '__hrtimer_run_queues' 'ktime_get_real_seconds' syzkaller login: [ 50.261190][ T0] ================================================================== [ 50.269326][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 50.276370][ T0] [ 50.278701][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7219 on cpu 0: [ 50.286238][ T0] mod_timer+0x50d/0x7a0 [ 50.290477][ T0] sk_reset_timer+0x2d/0x70 [ 50.294983][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 50.300175][ T0] tcp_rearm_rto+0x4f/0x60 [ 50.304618][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.310077][ T0] tcp_write_xmit+0xa16/0x3080 [ 50.314836][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.320368][ T0] tcp_push+0x1e9/0x3d0 [ 50.324506][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 50.329690][ T0] tcp_sendmsg+0x39/0x60 [ 50.333937][ T0] inet_sendmsg+0x6d/0x90 [ 50.338253][ T0] sock_sendmsg+0x9f/0xc0 [ 50.342602][ T0] sock_write_iter+0x16b/0x210 [ 50.347360][ T0] new_sync_write+0x388/0x4a0 [ 50.352040][ T0] [ 50.354370][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 50.361830][ T0] timer_clear_idle+0x42/0x50 [ 50.366500][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.372387][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.377503][ T0] do_idle+0xb1/0x280 [ 50.381468][ T0] cpu_startup_entry+0x1b/0x20 [ 50.386222][ T0] start_secondary+0x208/0x260 [ 50.390971][ T0] secondary_startup_64+0xa4/0xb0 [ 50.395969][ T0] [ 50.398285][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.404431][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 50.411523][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.421565][ T0] ================================================================== [ 50.429612][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.436181][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 50.443267][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.453314][ T0] Call Trace: [ 50.456612][ T0] dump_stack+0xf5/0x159 [ 50.460864][ T0] panic+0x210/0x640 [ 50.464767][ T0] ? vprintk_func+0x8d/0x140 [ 50.469363][ T0] kcsan_report.cold+0xc/0x10 [ 50.474046][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.479603][ T0] __tsan_write1+0x32/0x40 [ 50.484021][ T0] timer_clear_idle+0x42/0x50 [ 50.488692][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.494577][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.499677][ T0] do_idle+0xb1/0x280 [ 50.503701][ T0] ? complete+0x44/0x50 [ 50.507896][ T0] cpu_startup_entry+0x1b/0x20 [ 50.512653][ T0] start_secondary+0x208/0x260 [ 50.517491][ T0] secondary_startup_64+0xa4/0xb0 [ 50.524011][ T0] Kernel Offset: disabled [ 50.528331][ T0] Rebooting in 86400 seconds..