[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.171392][ T26] audit: type=1800 audit(1571742962.110:25): pid=7063 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.191883][ T26] audit: type=1800 audit(1571742962.110:26): pid=7063 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.212942][ T26] audit: type=1800 audit(1571742962.110:27): pid=7063 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 '10.128.0.57' (ECDSA) to the list of known hosts. 2019/10/22 11:16:10 fuzzer started 2019/10/22 11:16:12 dialing manager at 10.128.0.105:37053 2019/10/22 11:16:12 syscalls: 2524 2019/10/22 11:16:12 code coverage: enabled 2019/10/22 11:16:12 comparison tracing: enabled 2019/10/22 11:16:12 extra coverage: extra coverage is not supported by the kernel 2019/10/22 11:16:12 setuid sandbox: enabled 2019/10/22 11:16:12 namespace sandbox: enabled 2019/10/22 11:16:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 11:16:12 fault injection: enabled 2019/10/22 11:16:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 11:16:12 net packet injection: enabled 2019/10/22 11:16:12 net device setup: enabled 2019/10/22 11:16:12 concurrency sanitizer: enabled syzkaller login: [ 49.205008][ T0] ================================================================== [ 49.215333][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 49.222263][ T0] [ 49.224585][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7231 on cpu 1: [ 49.232169][ T0] mod_timer+0x50d/0x7a0 [ 49.236397][ T0] sk_reset_timer+0x2d/0x70 [ 49.240880][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 49.246055][ T0] tcp_rearm_rto+0x4f/0x60 [ 49.250464][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 49.255898][ T0] tcp_write_xmit+0xa16/0x3080 [ 49.260642][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 49.266259][ T0] tcp_push+0x1e9/0x3d0 [ 49.270561][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 49.275757][ T0] tcp_sendmsg+0x39/0x60 [ 49.279980][ T0] inet_sendmsg+0x6d/0x90 [ 49.284405][ T0] sock_sendmsg+0x9f/0xc0 [ 49.288755][ T0] sock_write_iter+0x16b/0x210 [ 49.293496][ T0] new_sync_write+0x388/0x4a0 [ 49.298145][ T0] [ 49.300471][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 49.307826][ T0] timer_clear_idle+0x42/0x50 [ 49.312510][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 49.318396][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 49.323489][ T0] do_idle+0xb1/0x280 [ 49.327448][ T0] cpu_startup_entry+0x1b/0x20 [ 49.332205][ T0] rest_init+0xec/0xf6 [ 49.336267][ T0] arch_call_rest_init+0x17/0x37 [ 49.341197][ T0] start_kernel+0x838/0x85e [ 49.345709][ T0] x86_64_start_reservations+0x29/0x2b [ 49.351151][ T0] x86_64_start_kernel+0x72/0x76 [ 49.356086][ T0] secondary_startup_64+0xa4/0xb0 [ 49.361089][ T0] [ 49.363405][ T0] Reported by Kernel Concurrency Sanitizer on: [ 49.369540][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.376916][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.387039][ T0] ================================================================== [ 49.395170][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 49.401845][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.409233][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.419463][ T0] Call Trace: [ 49.422743][ T0] dump_stack+0xf5/0x159 [ 49.426996][ T0] panic+0x210/0x640 [ 49.430888][ T0] ? x86_64_start_reservations+0x29/0x2b [ 49.436536][ T0] ? vprintk_func+0x8d/0x140 [ 49.441296][ T0] kcsan_report.cold+0xc/0x10 [ 49.445968][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.451618][ T0] __tsan_write1+0x32/0x40 [ 49.456017][ T0] timer_clear_idle+0x42/0x50 [ 49.460677][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 49.466568][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 49.471662][ T0] do_idle+0xb1/0x280 [ 49.475644][ T0] cpu_startup_entry+0x1b/0x20 [ 49.480391][ T0] rest_init+0xec/0xf6 [ 49.484457][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 49.491652][ T0] arch_call_rest_init+0x17/0x37 [ 49.496598][ T0] start_kernel+0x838/0x85e [ 49.501107][ T0] x86_64_start_reservations+0x29/0x2b [ 49.506563][ T0] x86_64_start_kernel+0x72/0x76 [ 49.511514][ T0] secondary_startup_64+0xa4/0xb0 [ 49.518346][ T0] Kernel Offset: disabled [ 49.522801][ T0] Rebooting in 86400 seconds..