[ 51.349343][ T26] audit: type=1800 audit(1573490242.690:27): pid=7839 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.369574][ T26] audit: type=1800 audit(1573490242.700:28): pid=7839 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. [ 51.961436][ T26] audit: type=1800 audit(1573490243.340:29): pid=7839 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 [ 51.983519][ T26] audit: type=1800 audit(1573490243.340:30): pid=7839 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 '10.128.1.44' (ECDSA) to the list of known hosts. 2019/11/11 16:37:33 fuzzer started 2019/11/11 16:37:35 dialing manager at 10.128.0.105:44241 2019/11/11 16:37:35 syscalls: 2566 2019/11/11 16:37:35 code coverage: enabled 2019/11/11 16:37:35 comparison tracing: enabled 2019/11/11 16:37:35 extra coverage: extra coverage is not supported by the kernel 2019/11/11 16:37:35 setuid sandbox: enabled 2019/11/11 16:37:35 namespace sandbox: enabled 2019/11/11 16:37:35 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/11 16:37:35 fault injection: enabled 2019/11/11 16:37:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/11 16:37:35 net packet injection: enabled 2019/11/11 16:37:35 net device setup: enabled 2019/11/11 16:37:35 concurrency sanitizer: enabled 2019/11/11 16:37:35 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/11 16:37:40 adding functions to KCSAN blacklist: 'tick_do_update_jiffies64' 'vm_area_dup' 'tick_sched_do_timer' 'echo_char' 'file_update_time' 'ep_poll' 'ktime_get_real_seconds' 'pipe_poll' 'fsnotify' 'tick_nohz_idle_stop_tick' 'p9_poll_workfn' 'pid_update_inode' '__hrtimer_run_queues' 'find_get_pages_range_tag' 'common_perm_cond' '__add_to_page_cache_locked' '__ip6_datagram_connect' 'generic_write_end' 'generic_permission' 'find_next_bit' 'n_tty_receive_buf_common' 'tomoyo_supervisor' 'tcp_add_backlog' 'wbt_done' 'run_timer_softirq' 'ext4_free_inode' 'ext4_has_free_clusters' 'do_nanosleep' 'taskstats_exit' 'rcu_gp_fqs_check_wake' '__ext4_new_inode' syzkaller login: [ 88.019359][ T0] ================================================================== [ 88.027679][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 88.034687][ T0] [ 88.037035][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 8003 on cpu 1: [ 88.044674][ T0] mod_timer+0x50d/0x7a0 [ 88.048956][ T0] sk_reset_timer+0x2d/0x70 [ 88.053484][ T0] tcp_rearm_rto+0x1e7/0x2a0 [ 88.058106][ T0] tcp_event_new_data_sent+0x218/0x220 [ 88.063590][ T0] tcp_write_xmit+0xa77/0x3120 [ 88.068619][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 88.074178][ T0] tcp_push+0x1e9/0x3d0 [ 88.078359][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 88.083714][ T0] tcp_sendmsg+0x39/0x60 [ 88.088043][ T0] inet_sendmsg+0x6d/0x90 [ 88.092372][ T0] sock_sendmsg+0x9f/0xc0 [ 88.096714][ T0] sock_write_iter+0x16b/0x210 [ 88.101619][ T0] new_sync_write+0x388/0x4a0 [ 88.106284][ T0] __vfs_write+0xb1/0xc0 [ 88.110652][ T0] vfs_write+0x18a/0x390 [ 88.114892][ T0] ksys_write+0xd5/0x1b0 [ 88.119263][ T0] __x64_sys_write+0x4c/0x60 [ 88.123853][ T0] do_syscall_64+0xcc/0x370 [ 88.128349][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.134243][ T0] [ 88.136578][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 88.144063][ T0] timer_clear_idle+0x42/0x50 [ 88.148728][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 88.154695][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 88.159793][ T0] do_idle+0xb1/0x280 [ 88.163766][ T0] cpu_startup_entry+0x1b/0x20 [ 88.168519][ T0] rest_init+0xec/0xf6 [ 88.172670][ T0] arch_call_rest_init+0x17/0x37 [ 88.177603][ T0] start_kernel+0x838/0x85e [ 88.182110][ T0] x86_64_start_reservations+0x29/0x2b [ 88.187556][ T0] x86_64_start_kernel+0x72/0x76 [ 88.192505][ T0] secondary_startup_64+0xa4/0xb0 [ 88.197523][ T0] [ 88.199841][ T0] Reported by Kernel Concurrency Sanitizer on: [ 88.205995][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 88.213104][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.223167][ T0] ================================================================== [ 88.231226][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 88.237825][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 88.245189][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.255385][ T0] Call Trace: [ 88.258846][ T0] dump_stack+0xf5/0x159 [ 88.263095][ T0] panic+0x210/0x640 [ 88.266978][ T0] ? vprintk_func+0x8d/0x140 [ 88.271556][ T0] kcsan_report.cold+0xc/0xe [ 88.276144][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 88.281523][ T0] __tsan_unaligned_write1+0x13d/0x1e0 [ 88.286991][ T0] timer_clear_idle+0x42/0x50 [ 88.291686][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 88.297596][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 88.302744][ T0] do_idle+0xb1/0x280 [ 88.306746][ T0] cpu_startup_entry+0x1b/0x20 [ 88.311512][ T0] rest_init+0xec/0xf6 [ 88.315581][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 88.322991][ T0] arch_call_rest_init+0x17/0x37 [ 88.327934][ T0] start_kernel+0x838/0x85e [ 88.332442][ T0] x86_64_start_reservations+0x29/0x2b [ 88.337898][ T0] x86_64_start_kernel+0x72/0x76 [ 88.342842][ T0] secondary_startup_64+0xa4/0xb0 [ 88.349442][ T0] Kernel Offset: disabled [ 88.353768][ T0] Rebooting in 86400 seconds..