[ 51.829928][ T25] audit: type=1800 audit(1573142906.383:26): pid=7899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 51.856127][ T25] audit: type=1800 audit(1573142906.383:27): pid=7899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.928870][ T25] audit: type=1800 audit(1573142906.393:28): pid=7899 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. [ 52.686838][ T25] audit: type=1800 audit(1573142907.263:29): pid=7899 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 '10.128.15.201' (ECDSA) to the list of known hosts. 2019/11/07 16:08:36 fuzzer started 2019/11/07 16:08:38 dialing manager at 10.128.0.105:38105 2019/11/07 16:08:40 syscalls: 2553 2019/11/07 16:08:40 code coverage: enabled 2019/11/07 16:08:40 comparison tracing: enabled 2019/11/07 16:08:40 extra coverage: extra coverage is not supported by the kernel 2019/11/07 16:08:40 setuid sandbox: enabled 2019/11/07 16:08:40 namespace sandbox: enabled 2019/11/07 16:08:40 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/07 16:08:40 fault injection: enabled 2019/11/07 16:08:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/07 16:08:40 net packet injection: enabled 2019/11/07 16:08:40 net device setup: enabled 2019/11/07 16:08:40 concurrency sanitizer: enabled 2019/11/07 16:08:40 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 66.048387][ T8066] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/07 16:08:44 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'poll_schedule_timeout' 'tick_do_update_jiffies64' 'pipe_poll' 'ext4_free_inode' 'blk_mq_get_request' 'tick_nohz_next_event' 'tcp_add_backlog' 'tomoyo_supervisor' 'generic_permission' 'ktime_get_real_seconds' 'ext4_has_free_clusters' 'do_exit' 'find_next_bit' 'run_timer_softirq' 'ext4_nonda_switch' 'find_get_pages_range_tag' 'common_perm_cond' 'pid_update_inode' 'do_nanosleep' '__skb_try_recv_from_queue' 'tick_sched_do_timer' 'add_timer' 'generic_fillattr' 'taskstats_exit' 'ep_poll' 'generic_write_end' 'blk_mq_run_hw_queue' 'rcu_gp_fqs_check_wake' [ 90.784918][ T0] ================================================================== [ 90.793180][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 90.800226][ T0] [ 90.802577][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 8051 on cpu 0: [ 90.810123][ T0] mod_timer+0x50d/0x7a0 [ 90.814373][ T0] sk_reset_timer+0x2d/0x70 [ 90.818985][ T0] tcp_rearm_rto+0x1e7/0x2a0 [ 90.823566][ T0] tcp_event_new_data_sent+0x218/0x220 [ 90.829019][ T0] tcp_write_xmit+0xa77/0x3120 [ 90.833787][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 90.839367][ T0] tcp_push+0x1e9/0x3d0 [ 90.843547][ T0] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 90.848758][ T0] tcp_sendmsg+0x39/0x60 [ 90.853117][ T0] inet_sendmsg+0x6d/0x90 [ 90.857590][ T0] sock_sendmsg+0x9f/0xc0 [ 90.861937][ T0] sock_write_iter+0x16b/0x210 [ 90.866704][ T0] new_sync_write+0x388/0x4a0 [ 90.871373][ T0] __vfs_write+0xb1/0xc0 [ 90.875609][ T0] vfs_write+0x18a/0x390 [ 90.879844][ T0] ksys_write+0xd5/0x1b0 [ 90.884092][ T0] __x64_sys_write+0x4c/0x60 [ 90.888682][ T0] do_syscall_64+0xcc/0x370 [ 90.893201][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 90.899089][ T0] [ 90.901429][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 90.908824][ T0] timer_clear_idle+0x42/0x50 [ 90.913532][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 90.919427][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 90.924548][ T0] do_idle+0xb1/0x280 [ 90.928542][ T0] cpu_startup_entry+0x1b/0x20 [ 90.933320][ T0] start_secondary+0x208/0x260 [ 90.938111][ T0] secondary_startup_64+0xa4/0xb0 [ 90.943135][ T0] [ 90.945454][ T0] Reported by Kernel Concurrency Sanitizer on: [ 90.951717][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 90.958882][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.968939][ T0] ================================================================== [ 90.977130][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 90.983726][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 90.990827][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.000961][ T0] Call Trace: [ 91.004272][ T0] dump_stack+0xf5/0x159 [ 91.008524][ T0] panic+0x210/0x640 [ 91.012439][ T0] ? vprintk_func+0x8d/0x140 [ 91.017054][ T0] kcsan_report.cold+0xc/0xe [ 91.021648][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 91.027019][ T0] __tsan_unaligned_write1+0x13d/0x1e0 [ 91.032506][ T0] timer_clear_idle+0x42/0x50 [ 91.037217][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 91.043120][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 91.048228][ T0] do_idle+0xb1/0x280 [ 91.052208][ T0] cpu_startup_entry+0x1b/0x20 [ 91.056967][ T0] start_secondary+0x208/0x260 [ 91.061745][ T0] secondary_startup_64+0xa4/0xb0 [ 91.068233][ T0] Kernel Offset: disabled [ 91.072579][ T0] Rebooting in 86400 seconds..