[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.026747][ T23] audit: type=1800 audit(1571841641.124:25): pid=7053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.071648][ T23] audit: type=1800 audit(1571841641.124:26): pid=7053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.102743][ T23] audit: type=1800 audit(1571841641.124:27): pid=7053 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 '10.128.10.56' (ECDSA) to the list of known hosts. 2019/10/23 14:40:48 fuzzer started 2019/10/23 14:40:50 dialing manager at 10.128.0.105:40369 2019/10/23 14:40:50 syscalls: 2524 2019/10/23 14:40:50 code coverage: enabled 2019/10/23 14:40:50 comparison tracing: enabled 2019/10/23 14:40:50 extra coverage: extra coverage is not supported by the kernel 2019/10/23 14:40:50 setuid sandbox: enabled 2019/10/23 14:40:50 namespace sandbox: enabled 2019/10/23 14:40:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 14:40:50 fault injection: enabled 2019/10/23 14:40:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 14:40:50 net packet injection: enabled 2019/10/23 14:40:50 net device setup: enabled 2019/10/23 14:40:50 concurrency sanitizer: enabled syzkaller login: [ 51.024353][ T7221] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/23 14:40:57 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' 'blk_mq_get_request' 'update_defense_level' 'generic_write_end' '__nf_ct_refresh_acct' 'wbt_issue' 'taskstats_exit' 'tcp_poll' 'ext4_free_inode' 'fanotify_handle_event' 'generic_fillattr' 'tcp_add_backlog' 'ep_poll' 'rcu_gp_fqs_check_wake' 'dd_has_work' 'pcpu_alloc' 'tick_do_update_jiffies64' 'pipe_poll' 'find_next_bit' 'ext4_has_free_clusters' 'vti_tunnel_xmit' 'tomoyo_supervisor' 'generic_permission' 'ktime_get_real_seconds' '__nf_conntrack_find_get' 'echo_char' 'ext4_nonda_switch' '__splice_from_pipe' 'poll_schedule_timeout' 'tick_sched_do_timer' '__hrtimer_run_queues' 'common_perm_cond' 'add_timer' 'tick_nohz_idle_stop_tick' 'page_counter_try_charge' [ 67.456796][ T0] ================================================================== [ 67.464910][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 67.471812][ T0] [ 67.474118][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7220 on cpu 1: [ 67.481639][ T0] mod_timer+0x50d/0x7a0 [ 67.485857][ T0] sk_reset_timer+0x2d/0x70 [ 67.490386][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 67.495555][ T0] tcp_rearm_rto+0x4f/0x60 [ 67.499948][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 67.505377][ T0] tcp_write_xmit+0xa16/0x3080 [ 67.510114][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 67.515650][ T0] tcp_push+0x1e9/0x3d0 [ 67.519782][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 67.524999][ T0] tcp_sendmsg+0x39/0x60 [ 67.529264][ T0] inet_sendmsg+0x6d/0x90 [ 67.533571][ T0] sock_sendmsg+0x9f/0xc0 [ 67.537874][ T0] sock_write_iter+0x16b/0x210 [ 67.542613][ T0] new_sync_write+0x388/0x4a0 [ 67.547257][ T0] [ 67.549564][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 67.556906][ T0] timer_clear_idle+0x42/0x50 [ 67.561560][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.567428][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.572514][ T0] do_idle+0xb1/0x280 [ 67.576470][ T0] cpu_startup_entry+0x1b/0x20 [ 67.581208][ T0] rest_init+0xec/0xf6 [ 67.585253][ T0] arch_call_rest_init+0x17/0x37 [ 67.590161][ T0] start_kernel+0x838/0x85e [ 67.594651][ T0] x86_64_start_reservations+0x29/0x2b [ 67.600080][ T0] x86_64_start_kernel+0x72/0x76 [ 67.604990][ T0] secondary_startup_64+0xa4/0xb0 [ 67.609980][ T0] [ 67.612279][ T0] Reported by Kernel Concurrency Sanitizer on: [ 67.618406][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.625483][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.635511][ T0] ================================================================== [ 67.643546][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 67.650109][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.657200][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.667242][ T0] Call Trace: [ 67.670511][ T0] dump_stack+0xf5/0x159 [ 67.674728][ T0] panic+0x210/0x640 [ 67.678600][ T0] ? x86_64_start_reservations+0x29/0x2b [ 67.684210][ T0] ? vprintk_func+0x8d/0x140 [ 67.688803][ T0] kcsan_report.cold+0xc/0x10 [ 67.693457][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 67.698992][ T0] __tsan_write1+0x32/0x40 [ 67.703406][ T0] timer_clear_idle+0x42/0x50 [ 67.708078][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.713951][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.719038][ T0] do_idle+0xb1/0x280 [ 67.722998][ T0] cpu_startup_entry+0x1b/0x20 [ 67.727735][ T0] rest_init+0xec/0xf6 [ 67.731787][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 67.738957][ T0] arch_call_rest_init+0x17/0x37 [ 67.743883][ T0] start_kernel+0x838/0x85e [ 67.748367][ T0] x86_64_start_reservations+0x29/0x2b [ 67.753802][ T0] x86_64_start_kernel+0x72/0x76 [ 67.758719][ T0] secondary_startup_64+0xa4/0xb0 [ 67.765064][ T0] Kernel Offset: disabled [ 67.769385][ T0] Rebooting in 86400 seconds..