[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 34.790047][ T26] audit: type=1800 audit(1572870155.001:25): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.836566][ T26] audit: type=1800 audit(1572870155.001:26): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.862195][ T26] audit: type=1800 audit(1572870155.001:27): pid=7028 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.107' (ECDSA) to the list of known hosts. 2019/11/04 12:22:43 fuzzer started 2019/11/04 12:22:45 dialing manager at 10.128.0.105:43623 2019/11/04 12:22:46 syscalls: 2553 2019/11/04 12:22:46 code coverage: enabled 2019/11/04 12:22:46 comparison tracing: enabled 2019/11/04 12:22:46 extra coverage: extra coverage is not supported by the kernel 2019/11/04 12:22:46 setuid sandbox: enabled 2019/11/04 12:22:46 namespace sandbox: enabled 2019/11/04 12:22:46 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/04 12:22:46 fault injection: enabled 2019/11/04 12:22:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/04 12:22:46 net packet injection: enabled 2019/11/04 12:22:46 net device setup: enabled 2019/11/04 12:22:46 concurrency sanitizer: enabled 2019/11/04 12:22:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/04 12:22:52 adding functions to KCSAN blacklist: '__nf_conntrack_find_get' 'echo_char' 'ext4_free_inode' 'ext4_has_free_clusters' '__ext4_new_inode' 'tick_nohz_idle_stop_tick' 'wbt_done' '__hrtimer_run_queues' 'find_next_bit' 'ep_poll' 'ktime_get_real_seconds' 'taskstats_exit' 'tick_do_update_jiffies64' 'run_timer_softirq' 'generic_permission' 'add_timer' 'rcu_gp_fqs_loop' 'ext4_setattr' 'tomoyo_supervisor' '__tcp_select_window' 'tcp_poll' 'tcp_add_backlog' 'pid_update_inode' '__nf_ct_refresh_acct' 'rcu_gp_fqs_check_wake' 'pipe_poll' 'do_nanosleep' 'tick_sched_do_timer' 'kauditd_thread' 'ktime_get_seconds' 'generic_fillattr' 'task_dump_owner' 'dd_has_work' 'find_get_pages_range_tag' 'generic_write_end' syzkaller login: [ 67.167864][ T0] ================================================================== [ 67.176024][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 67.182942][ T0] [ 67.185251][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7182 on cpu 1: [ 67.192809][ T0] mod_timer+0x50d/0x7a0 [ 67.197079][ T0] sk_reset_timer+0x2d/0x70 [ 67.201586][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 67.206814][ T0] tcp_rearm_rto+0x4f/0x60 [ 67.211227][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 67.216683][ T0] tcp_write_xmit+0xa16/0x3080 [ 67.221454][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 67.227005][ T0] tcp_push+0x1e9/0x3d0 [ 67.231170][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 67.236406][ T0] tcp_sendmsg+0x39/0x60 [ 67.240656][ T0] inet_sendmsg+0x6d/0x90 [ 67.244974][ T0] sock_sendmsg+0x9f/0xc0 [ 67.249317][ T0] sock_write_iter+0x16b/0x210 [ 67.254074][ T0] new_sync_write+0x388/0x4a0 [ 67.258729][ T0] [ 67.261055][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 67.268418][ T0] timer_clear_idle+0x42/0x50 [ 67.273097][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.278983][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.284100][ T0] do_idle+0xb1/0x280 [ 67.288081][ T0] cpu_startup_entry+0x1b/0x20 [ 67.292838][ T0] rest_init+0xec/0xf6 [ 67.296903][ T0] arch_call_rest_init+0x17/0x37 [ 67.301835][ T0] start_kernel+0x838/0x85e [ 67.306330][ T0] x86_64_start_reservations+0x29/0x2b [ 67.311783][ T0] x86_64_start_kernel+0x72/0x76 [ 67.316716][ T0] secondary_startup_64+0xa4/0xb0 [ 67.321725][ T0] [ 67.324034][ T0] Reported by Kernel Concurrency Sanitizer on: [ 67.330189][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.337284][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.347329][ T0] ================================================================== [ 67.355394][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 67.361999][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.369098][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.379145][ T0] Call Trace: [ 67.382417][ T0] dump_stack+0xf5/0x159 [ 67.386768][ T0] panic+0x210/0x640 [ 67.390673][ T0] ? x86_64_start_reservations+0x29/0x2b [ 67.396312][ T0] ? vprintk_func+0x8d/0x140 [ 67.400902][ T0] kcsan_report.cold+0xc/0x10 [ 67.405580][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 67.411137][ T0] __tsan_write1+0x32/0x40 [ 67.415561][ T0] timer_clear_idle+0x42/0x50 [ 67.420239][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.426121][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.431223][ T0] do_idle+0xb1/0x280 [ 67.435208][ T0] cpu_startup_entry+0x1b/0x20 [ 67.439965][ T0] rest_init+0xec/0xf6 [ 67.444033][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 67.451224][ T0] arch_call_rest_init+0x17/0x37 [ 67.456158][ T0] start_kernel+0x838/0x85e [ 67.460645][ T0] x86_64_start_reservations+0x29/0x2b [ 67.466084][ T0] x86_64_start_kernel+0x72/0x76 [ 67.471002][ T0] secondary_startup_64+0xa4/0xb0 [ 67.477154][ T0] Kernel Offset: disabled [ 67.481518][ T0] Rebooting in 86400 seconds..