[ 52.685327][ T26] audit: type=1800 audit(1573008817.953:27): pid=7874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 52.728912][ T26] audit: type=1800 audit(1573008817.963:28): pid=7874 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. [ 53.650120][ T26] audit: type=1800 audit(1573008818.963:29): pid=7874 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 [ 53.670172][ T26] audit: type=1800 audit(1573008818.963:30): pid=7874 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 '10.128.0.110' (ECDSA) to the list of known hosts. 2019/11/06 02:53:47 fuzzer started 2019/11/06 02:53:49 dialing manager at 10.128.0.105:39303 2019/11/06 02:53:50 syscalls: 2553 2019/11/06 02:53:50 code coverage: enabled 2019/11/06 02:53:50 comparison tracing: enabled 2019/11/06 02:53:50 extra coverage: extra coverage is not supported by the kernel 2019/11/06 02:53:50 setuid sandbox: enabled 2019/11/06 02:53:50 namespace sandbox: enabled 2019/11/06 02:53:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/06 02:53:50 fault injection: enabled 2019/11/06 02:53:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/06 02:53:50 net packet injection: enabled 2019/11/06 02:53:50 net device setup: enabled 2019/11/06 02:53:50 concurrency sanitizer: enabled 2019/11/06 02:53:50 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/06 02:53:54 adding functions to KCSAN blacklist: 'generic_fillattr' 'ext4_free_inode' 'ktime_get_real_seconds' 'tomoyo_supervisor' 'vm_area_dup' 'ext4_free_inodes_count' 'ext4_has_free_clusters' 'sit_tunnel_xmit' 'tick_sched_do_timer' '__hrtimer_run_queues' 'run_timer_softirq' 'do_nanosleep' 'tcp_add_backlog' 'find_get_pages_range_tag' 'task_dump_owner' 'generic_write_end' 'tick_nohz_next_event' 'ep_poll' 'rcu_gp_fqs_check_wake' 'blk_mq_dispatch_rq_list' 'wbt_issue' 'generic_permission' 'wbt_done' 'find_next_bit' 'tick_do_update_jiffies64' syzkaller login: [ 76.474169][ T0] ================================================================== [ 76.482295][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 76.489254][ T0] [ 76.491616][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 8024 on cpu 1: [ 76.499158][ T0] mod_timer+0x50d/0x7a0 [ 76.503389][ T0] sk_reset_timer+0x2d/0x70 [ 76.507881][ T0] tcp_rearm_rto+0x1e7/0x2a0 [ 76.512462][ T0] tcp_event_new_data_sent+0x218/0x220 [ 76.517910][ T0] tcp_write_xmit+0xa77/0x3120 [ 76.522924][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 76.528466][ T0] tcp_push+0x1e9/0x3d0 [ 76.532610][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 76.537855][ T0] tcp_sendmsg+0x39/0x60 [ 76.542096][ T0] inet_sendmsg+0x6d/0x90 [ 76.546544][ T0] sock_sendmsg+0x9f/0xc0 [ 76.550888][ T0] sock_write_iter+0x16b/0x210 [ 76.555640][ T0] new_sync_write+0x388/0x4a0 [ 76.560301][ T0] __vfs_write+0xb1/0xc0 [ 76.564530][ T0] vfs_write+0x18a/0x390 [ 76.568762][ T0] ksys_write+0xd5/0x1b0 [ 76.573008][ T0] __x64_sys_write+0x4c/0x60 [ 76.577586][ T0] do_syscall_64+0xcc/0x370 [ 76.582081][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 76.587975][ T0] [ 76.590298][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 76.597659][ T0] timer_clear_idle+0x42/0x50 [ 76.602329][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 76.608213][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 76.613311][ T0] do_idle+0xb1/0x280 [ 76.617376][ T0] cpu_startup_entry+0x1b/0x20 [ 76.622150][ T0] rest_init+0xec/0xf6 [ 76.626298][ T0] arch_call_rest_init+0x17/0x37 [ 76.631228][ T0] start_kernel+0x838/0x85e [ 76.635722][ T0] x86_64_start_reservations+0x29/0x2b [ 76.641173][ T0] x86_64_start_kernel+0x72/0x76 [ 76.646100][ T0] secondary_startup_64+0xa4/0xb0 [ 76.651108][ T0] [ 76.653421][ T0] Reported by Kernel Concurrency Sanitizer on: [ 76.659559][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 76.666689][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.676943][ T0] ================================================================== [ 76.685015][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 76.691599][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 76.698716][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.708758][ T0] Call Trace: [ 76.712046][ T0] dump_stack+0xf5/0x159 [ 76.716312][ T0] panic+0x210/0x640 [ 76.720335][ T0] ? vprintk_func+0x8d/0x140 [ 76.724922][ T0] kcsan_report.cold+0xc/0xe [ 76.729505][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 76.734866][ T0] __tsan_unaligned_write1+0x13d/0x1e0 [ 76.740319][ T0] timer_clear_idle+0x42/0x50 [ 76.744993][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 76.750882][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 76.755988][ T0] do_idle+0xb1/0x280 [ 76.759961][ T0] cpu_startup_entry+0x1b/0x20 [ 76.764716][ T0] rest_init+0xec/0xf6 [ 76.768775][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 76.775959][ T0] arch_call_rest_init+0x17/0x37 [ 76.780896][ T0] start_kernel+0x838/0x85e [ 76.785483][ T0] x86_64_start_reservations+0x29/0x2b [ 76.791452][ T0] x86_64_start_kernel+0x72/0x76 [ 76.796415][ T0] secondary_startup_64+0xa4/0xb0 [ 76.802886][ T0] Kernel Offset: disabled [ 76.807227][ T0] Rebooting in 86400 seconds..