[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.950306][ T25] audit: type=1800 audit(1570533581.880:25): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.978675][ T25] audit: type=1800 audit(1570533581.890:26): pid=7090 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.002779][ T25] audit: type=1800 audit(1570533581.890:27): pid=7090 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 '10.128.0.37' (ECDSA) to the list of known hosts. 2019/10/08 11:19:52 fuzzer started 2019/10/08 11:19:53 dialing manager at 10.128.0.105:33861 2019/10/08 11:19:53 syscalls: 2523 2019/10/08 11:19:53 code coverage: enabled 2019/10/08 11:19:53 comparison tracing: enabled 2019/10/08 11:19:53 extra coverage: extra coverage is not supported by the kernel 2019/10/08 11:19:53 setuid sandbox: enabled 2019/10/08 11:19:53 namespace sandbox: enabled 2019/10/08 11:19:53 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 11:19:53 fault injection: enabled 2019/10/08 11:19:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 11:19:53 net packet injection: enabled 2019/10/08 11:19:53 net device setup: enabled 2019/10/08 11:19:53 concurrency sanitizer: enabled syzkaller login: [ 47.516121][ T0] ================================================================== [ 47.524316][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 47.531384][ T0] [ 47.533769][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7238 on cpu 0: [ 47.541335][ T0] mod_timer+0x50d/0x7a0 [ 47.545611][ T0] sk_reset_timer+0x2d/0x70 [ 47.550110][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 47.555294][ T0] tcp_rearm_rto+0x4f/0x60 [ 47.559751][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 47.565238][ T0] tcp_write_xmit+0xa16/0x3080 [ 47.570142][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 47.575673][ T0] tcp_push+0x1e9/0x3d0 [ 47.579807][ T0] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 47.584985][ T0] tcp_sendmsg+0x39/0x60 [ 47.589208][ T0] inet_sendmsg+0x6d/0x90 [ 47.593524][ T0] sock_sendmsg+0x9f/0xc0 [ 47.597827][ T0] sock_write_iter+0x16b/0x210 [ 47.602579][ T0] new_sync_write+0x388/0x4a0 [ 47.607223][ T0] [ 47.609528][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 47.616871][ T0] timer_clear_idle+0x42/0x50 [ 47.621527][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.627411][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.632495][ T0] do_idle+0xb0/0x2c0 [ 47.636463][ T0] cpu_startup_entry+0x1b/0x20 [ 47.641204][ T0] start_secondary+0x207/0x260 [ 47.645953][ T0] secondary_startup_64+0xa4/0xb0 [ 47.650944][ T0] [ 47.653244][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.659370][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 47.666099][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.676127][ T0] ================================================================== [ 47.684169][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.690735][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 47.697474][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.707502][ T0] Call Trace: [ 47.710779][ T0] dump_stack+0xf5/0x159 [ 47.715009][ T0] panic+0x209/0x639 [ 47.718897][ T0] ? vprintk_func+0x8d/0x140 [ 47.723463][ T0] kcsan_report.cold+0x57/0xeb [ 47.728206][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 47.733727][ T0] __tsan_write1+0x32/0x40 [ 47.738130][ T0] timer_clear_idle+0x42/0x50 [ 47.742786][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 47.748664][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 47.753759][ T0] do_idle+0xb0/0x2c0 [ 47.757726][ T0] ? complete+0x44/0x50 [ 47.761861][ T0] cpu_startup_entry+0x1b/0x20 [ 47.766600][ T0] start_secondary+0x207/0x260 [ 47.771339][ T0] secondary_startup_64+0xa4/0xb0 [ 47.777557][ T0] Kernel Offset: disabled [ 47.781877][ T0] Rebooting in 86400 seconds..