[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.281382][ T26] audit: type=1800 audit(1571705597.671:25): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.301061][ T26] audit: type=1800 audit(1571705597.671:26): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.362775][ T26] audit: type=1800 audit(1571705597.751:27): pid=7060 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 '10.128.1.1' (ECDSA) to the list of known hosts. 2019/10/22 00:53:24 fuzzer started 2019/10/22 00:53:25 dialing manager at 10.128.0.105:37053 2019/10/22 00:53:25 syscalls: 2524 2019/10/22 00:53:25 code coverage: enabled 2019/10/22 00:53:25 comparison tracing: enabled 2019/10/22 00:53:25 extra coverage: extra coverage is not supported by the kernel 2019/10/22 00:53:25 setuid sandbox: enabled 2019/10/22 00:53:25 namespace sandbox: enabled 2019/10/22 00:53:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 00:53:25 fault injection: enabled 2019/10/22 00:53:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 00:53:25 net packet injection: enabled 2019/10/22 00:53:25 net device setup: enabled 2019/10/22 00:53:25 concurrency sanitizer: enabled syzkaller login: [ 43.063323][ T0] ================================================================== [ 43.071660][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 43.078581][ T0] [ 43.080922][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7213 on cpu 0: [ 43.088472][ T0] mod_timer+0x50d/0x7a0 [ 43.092719][ T0] sk_reset_timer+0x2d/0x70 [ 43.097321][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 43.102515][ T0] tcp_rearm_rto+0x4f/0x60 [ 43.106933][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 43.112391][ T0] tcp_write_xmit+0xa16/0x3080 [ 43.117160][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 43.122708][ T0] tcp_push+0x1e9/0x3d0 [ 43.126868][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 43.132066][ T0] tcp_sendmsg+0x39/0x60 [ 43.136313][ T0] inet_sendmsg+0x6d/0x90 [ 43.140644][ T0] sock_sendmsg+0x9f/0xc0 [ 43.144979][ T0] sock_write_iter+0x16b/0x210 [ 43.149740][ T0] new_sync_write+0x388/0x4a0 [ 43.154404][ T0] [ 43.156736][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 43.165071][ T0] timer_clear_idle+0x42/0x50 [ 43.169769][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 43.175781][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 43.180994][ T0] do_idle+0xb1/0x280 [ 43.184984][ T0] cpu_startup_entry+0x1b/0x20 [ 43.189759][ T0] start_secondary+0x208/0x260 [ 43.194531][ T0] secondary_startup_64+0xa4/0xb0 [ 43.199548][ T0] [ 43.201875][ T0] Reported by Kernel Concurrency Sanitizer on: [ 43.208032][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 43.215134][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.225187][ T0] ================================================================== [ 43.233310][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 43.239900][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 43.247002][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.257057][ T0] Call Trace: [ 43.260355][ T0] dump_stack+0xf5/0x159 [ 43.264603][ T0] panic+0x210/0x640 [ 43.268503][ T0] ? vprintk_func+0x8d/0x140 [ 43.273086][ T0] kcsan_report.cold+0xc/0x10 [ 43.277754][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 43.283303][ T0] __tsan_write1+0x32/0x40 [ 43.287739][ T0] timer_clear_idle+0x42/0x50 [ 43.292581][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 43.298573][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 43.303685][ T0] do_idle+0xb1/0x280 [ 43.307705][ T0] ? complete+0x44/0x50 [ 43.311963][ T0] cpu_startup_entry+0x1b/0x20 [ 43.316727][ T0] start_secondary+0x208/0x260 [ 43.321498][ T0] secondary_startup_64+0xa4/0xb0 [ 43.327892][ T0] Kernel Offset: disabled [ 43.332216][ T0] Rebooting in 86400 seconds..