[ 53.166004][ T25] audit: type=1800 audit(1572964626.492:26): pid=7917 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 53.220366][ T25] audit: type=1800 audit(1572964626.492:27): pid=7917 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 53.241175][ T25] audit: type=1800 audit(1572964626.492:28): pid=7917 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 54.099906][ T25] audit: type=1800 audit(1572964627.482:29): pid=7917 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.211' (ECDSA) to the list of known hosts. 2019/11/05 14:37:15 fuzzer started 2019/11/05 14:37:17 dialing manager at 10.128.0.105:43787 2019/11/05 14:37:17 syscalls: 2553 2019/11/05 14:37:17 code coverage: enabled 2019/11/05 14:37:17 comparison tracing: enabled 2019/11/05 14:37:17 extra coverage: extra coverage is not supported by the kernel 2019/11/05 14:37:17 setuid sandbox: enabled 2019/11/05 14:37:17 namespace sandbox: enabled 2019/11/05 14:37:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/05 14:37:17 fault injection: enabled 2019/11/05 14:37:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/05 14:37:17 net packet injection: enabled 2019/11/05 14:37:17 net device setup: enabled 2019/11/05 14:37:17 concurrency sanitizer: enabled 2019/11/05 14:37:17 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/05 14:37:20 adding functions to KCSAN blacklist: 'pipe_poll' '__hrtimer_run_queues' 'tomoyo_supervisor' 'osq_lock' 'pipe_wait' 'ktime_get_real_seconds' 'ep_poll' 'tick_do_update_jiffies64' 'rcu_gp_fqs_check_wake' 'get_task_cred' 'generic_write_end' 'task_dump_owner' 'pid_update_inode' 'tcp_add_backlog' 'tick_sched_do_timer' 'find_next_bit' 'generic_permission' 'blk_mq_sched_dispatch_requests' 'do_nanosleep' syzkaller login: [ 70.048943][ T0] ================================================================== [ 70.057237][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 70.064159][ T0] [ 70.066473][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 8086 on cpu 1: [ 70.074013][ T0] mod_timer+0x50d/0x7a0 [ 70.078240][ T0] sk_reset_timer+0x2d/0x70 [ 70.082725][ T0] tcp_rearm_rto+0x1e7/0x2a0 [ 70.087324][ T0] tcp_event_new_data_sent+0x218/0x220 [ 70.092950][ T0] tcp_write_xmit+0xa77/0x3120 [ 70.097714][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 70.103263][ T0] tcp_push+0x1e9/0x3d0 [ 70.107406][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 70.112587][ T0] tcp_sendmsg+0x39/0x60 [ 70.116824][ T0] inet_sendmsg+0x6d/0x90 [ 70.121137][ T0] sock_sendmsg+0x9f/0xc0 [ 70.125462][ T0] sock_write_iter+0x16b/0x210 [ 70.130209][ T0] new_sync_write+0x388/0x4a0 [ 70.134866][ T0] __vfs_write+0xb1/0xc0 [ 70.139180][ T0] vfs_write+0x18a/0x390 [ 70.143419][ T0] ksys_write+0xd5/0x1b0 [ 70.147643][ T0] __x64_sys_write+0x4c/0x60 [ 70.152219][ T0] do_syscall_64+0xcc/0x370 [ 70.156704][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 70.162569][ T0] [ 70.164880][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 70.177655][ T0] timer_clear_idle+0x42/0x50 [ 70.182360][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 70.188415][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 70.193518][ T0] do_idle+0xb1/0x280 [ 70.197489][ T0] cpu_startup_entry+0x1b/0x20 [ 70.202239][ T0] rest_init+0xec/0xf6 [ 70.206308][ T0] arch_call_rest_init+0x17/0x37 [ 70.211231][ T0] start_kernel+0x838/0x85e [ 70.215738][ T0] x86_64_start_reservations+0x29/0x2b [ 70.221202][ T0] x86_64_start_kernel+0x72/0x76 [ 70.226125][ T0] secondary_startup_64+0xa4/0xb0 [ 70.231138][ T0] [ 70.233448][ T0] Reported by Kernel Concurrency Sanitizer on: [ 70.239585][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 70.246691][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.256987][ T0] ================================================================== [ 70.265028][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 70.271615][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 70.278715][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.288777][ T0] Call Trace: [ 70.292072][ T0] dump_stack+0xf5/0x159 [ 70.296314][ T0] panic+0x210/0x640 [ 70.300200][ T0] ? vprintk_func+0x8d/0x140 [ 70.304796][ T0] kcsan_report.cold+0xc/0xe [ 70.309388][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 70.314765][ T0] __tsan_unaligned_write1+0x13d/0x1e0 [ 70.320210][ T0] timer_clear_idle+0x42/0x50 [ 70.324886][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 70.330809][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 70.335911][ T0] do_idle+0xb1/0x280 [ 70.339884][ T0] cpu_startup_entry+0x1b/0x20 [ 70.344660][ T0] rest_init+0xec/0xf6 [ 70.348718][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 70.355902][ T0] arch_call_rest_init+0x17/0x37 [ 70.360928][ T0] start_kernel+0x838/0x85e [ 70.365438][ T0] x86_64_start_reservations+0x29/0x2b [ 70.370888][ T0] x86_64_start_kernel+0x72/0x76 [ 70.375828][ T0] secondary_startup_64+0xa4/0xb0 [ 70.382296][ T0] Kernel Offset: disabled [ 70.386625][ T0] Rebooting in 86400 seconds..