[ 51.083075][ T26] audit: type=1800 audit(1573053997.528:27): pid=7807 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.083095][ T26] audit: type=1800 audit(1573053997.528:28): pid=7807 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. [ 52.103166][ T26] audit: type=1800 audit(1573053998.598:29): pid=7807 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 [ 52.123368][ T26] audit: type=1800 audit(1573053998.598:30): pid=7807 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.255' (ECDSA) to the list of known hosts. 2019/11/06 15:26:49 fuzzer started 2019/11/06 15:26:51 dialing manager at 10.128.0.105:44951 2019/11/06 15:26:52 syscalls: 2553 2019/11/06 15:26:52 code coverage: enabled 2019/11/06 15:26:52 comparison tracing: enabled 2019/11/06 15:26:52 extra coverage: extra coverage is not supported by the kernel 2019/11/06 15:26:52 setuid sandbox: enabled 2019/11/06 15:26:52 namespace sandbox: enabled 2019/11/06 15:26:52 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/06 15:26:52 fault injection: enabled 2019/11/06 15:26:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/06 15:26:52 net packet injection: enabled 2019/11/06 15:26:52 net device setup: enabled 2019/11/06 15:26:52 concurrency sanitizer: enabled 2019/11/06 15:26:52 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 69.223803][ T7977] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/06 15:27:00 adding functions to KCSAN blacklist: 'blk_mq_sched_dispatch_requests' 'generic_fillattr' '__ext4_new_inode' 'lruvec_lru_size' 'echo_char' 'pipe_poll' '__skb_try_recv_from_queue' 'p9_poll_workfn' 'ext4_free_inodes_count' 'ep_poll' 'generic_permission' 'ktime_get_seconds' 'ktime_get_real_seconds' 'taskstats_exit' 'ext4_nonda_switch' 'poll_schedule_timeout' 'xas_clear_mark' '__hrtimer_run_queues' 'tomoyo_supervisor' 'blk_mq_dispatch_rq_list' 'sit_tunnel_xmit' 'add_timer' 'ext4_free_inode' 'tick_do_update_jiffies64' 'do_nanosleep' 'dd_has_work' 'run_timer_softirq' 'tcp_add_backlog' 'tick_nohz_next_event' 'vm_area_dup' 'rcu_gp_fqs_check_wake' 'tick_sched_do_timer' 'rcu_gp_fqs_loop' 'pid_update_inode' 'wbt_done' 'find_next_bit' 'blk_mq_get_request' 'init_peercred' [ 96.565042][ T0] ================================================================== [ 96.573212][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 96.580131][ T0] [ 96.582477][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7966 on cpu 1: [ 96.590035][ T0] mod_timer+0x50d/0x7a0 [ 96.594290][ T0] sk_reset_timer+0x2d/0x70 [ 96.598796][ T0] tcp_rearm_rto+0x1e7/0x2a0 [ 96.603391][ T0] tcp_event_new_data_sent+0x218/0x220 [ 96.608845][ T0] tcp_write_xmit+0xa77/0x3120 [ 96.613615][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 96.619180][ T0] tcp_push+0x1e9/0x3d0 [ 96.623371][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 96.628588][ T0] tcp_sendmsg+0x39/0x60 [ 96.632828][ T0] inet_sendmsg+0x6d/0x90 [ 96.637169][ T0] sock_sendmsg+0x9f/0xc0 [ 96.641501][ T0] sock_write_iter+0x16b/0x210 [ 96.646260][ T0] new_sync_write+0x388/0x4a0 [ 96.650961][ T0] __vfs_write+0xb1/0xc0 [ 96.655214][ T0] vfs_write+0x18a/0x390 [ 96.659526][ T0] ksys_write+0xd5/0x1b0 [ 96.663775][ T0] __x64_sys_write+0x4c/0x60 [ 96.668380][ T0] do_syscall_64+0xcc/0x370 [ 96.672906][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 96.678846][ T0] [ 96.681186][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 96.688590][ T0] timer_clear_idle+0x42/0x50 [ 96.693274][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 96.699214][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 96.704324][ T0] do_idle+0xb1/0x280 [ 96.708306][ T0] cpu_startup_entry+0x1b/0x20 [ 96.713059][ T0] rest_init+0xec/0xf6 [ 96.717137][ T0] arch_call_rest_init+0x17/0x37 [ 96.722080][ T0] start_kernel+0x838/0x85e [ 96.726582][ T0] x86_64_start_reservations+0x29/0x2b [ 96.732055][ T0] x86_64_start_kernel+0x72/0x76 [ 96.736999][ T0] secondary_startup_64+0xa4/0xb0 [ 96.742015][ T0] [ 96.744325][ T0] Reported by Kernel Concurrency Sanitizer on: [ 96.750466][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 96.757555][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 96.767604][ T0] ================================================================== [ 96.775669][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 96.782260][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 96.789366][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 96.799427][ T0] Call Trace: [ 96.802745][ T0] dump_stack+0xf5/0x159 [ 96.806994][ T0] panic+0x210/0x640 [ 96.810908][ T0] ? vprintk_func+0x8d/0x140 [ 96.815504][ T0] kcsan_report.cold+0xc/0xe [ 96.820101][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 96.825490][ T0] __tsan_unaligned_write1+0x13d/0x1e0 [ 96.830967][ T0] timer_clear_idle+0x42/0x50 [ 96.835659][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 96.841585][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 96.846723][ T0] do_idle+0xb1/0x280 [ 96.850733][ T0] cpu_startup_entry+0x1b/0x20 [ 96.855518][ T0] rest_init+0xec/0xf6 [ 96.859593][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 96.866792][ T0] arch_call_rest_init+0x17/0x37 [ 96.871747][ T0] start_kernel+0x838/0x85e [ 96.876261][ T0] x86_64_start_reservations+0x29/0x2b [ 96.881723][ T0] x86_64_start_kernel+0x72/0x76 [ 96.886666][ T0] secondary_startup_64+0xa4/0xb0 [ 96.893023][ T0] Kernel Offset: disabled [ 96.897468][ T0] Rebooting in 86400 seconds..