[ 32.587676][ T25] audit: type=1800 audit(1571545789.021:25): pid=7039 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 32.607370][ T25] audit: type=1800 audit(1571545789.021:26): pid=7039 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 32.629197][ T25] audit: type=1800 audit(1571545789.021:27): pid=7039 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. [ 33.020029][ T7103] sshd (7103) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts. 2019/10/20 04:29:57 fuzzer started 2019/10/20 04:29:58 dialing manager at 10.128.0.105:43535 2019/10/20 04:29:58 syscalls: 2524 2019/10/20 04:29:58 code coverage: enabled 2019/10/20 04:29:58 comparison tracing: enabled 2019/10/20 04:29:58 extra coverage: extra coverage is not supported by the kernel 2019/10/20 04:29:58 setuid sandbox: enabled 2019/10/20 04:29:58 namespace sandbox: enabled 2019/10/20 04:29:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 04:29:58 fault injection: enabled 2019/10/20 04:29:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 04:29:58 net packet injection: enabled 2019/10/20 04:29:58 net device setup: enabled 2019/10/20 04:29:58 concurrency sanitizer: enabled syzkaller login: [ 45.039963][ T0] ================================================================== [ 45.048101][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 45.055017][ T0] [ 45.057354][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7196 on cpu 0: [ 45.064884][ T0] mod_timer+0x50d/0x7a0 [ 45.069116][ T0] sk_reset_timer+0x2d/0x70 [ 45.073623][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 45.078821][ T0] tcp_rearm_rto+0x4f/0x60 [ 45.083238][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 45.088691][ T0] tcp_write_xmit+0xa16/0x3080 [ 45.093454][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 45.099003][ T0] tcp_push+0x1e9/0x3d0 [ 45.103182][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 45.108390][ T0] tcp_sendmsg+0x39/0x60 [ 45.112626][ T0] inet_sendmsg+0x6d/0x90 [ 45.116947][ T0] sock_sendmsg+0x9f/0xc0 [ 45.121279][ T0] sock_write_iter+0x16b/0x210 [ 45.126033][ T0] new_sync_write+0x388/0x4a0 [ 45.130690][ T0] [ 45.133015][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 45.140390][ T0] timer_clear_idle+0x42/0x50 [ 45.145070][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 45.150949][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 45.156071][ T0] do_idle+0xb1/0x280 [ 45.160056][ T0] cpu_startup_entry+0x1b/0x20 [ 45.164818][ T0] start_secondary+0x208/0x260 [ 45.169581][ T0] secondary_startup_64+0xa4/0xb0 [ 45.174591][ T0] [ 45.176907][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.183045][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 45.190136][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.200192][ T0] ================================================================== [ 45.208239][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.214826][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 45.221930][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.237023][ T0] Call Trace: [ 45.240432][ T0] dump_stack+0xf5/0x159 [ 45.244681][ T0] panic+0x210/0x640 [ 45.248580][ T0] ? vprintk_func+0x8d/0x140 [ 45.253183][ T0] kcsan_report.cold+0xc/0x10 [ 45.257864][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.263406][ T0] __tsan_write1+0x32/0x40 [ 45.267829][ T0] timer_clear_idle+0x42/0x50 [ 45.272505][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 45.278392][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 45.283520][ T0] do_idle+0xb1/0x280 [ 45.287503][ T0] ? complete+0x44/0x50 [ 45.291676][ T0] cpu_startup_entry+0x1b/0x20 [ 45.296941][ T0] start_secondary+0x208/0x260 [ 45.301735][ T0] secondary_startup_64+0xa4/0xb0 [ 45.308210][ T0] Kernel Offset: disabled [ 45.312542][ T0] Rebooting in 86400 seconds..