[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.546856][ T25] audit: type=1800 audit(1572817496.395:25): pid=7029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.566471][ T25] audit: type=1800 audit(1572817496.405:26): pid=7029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.566485][ T25] audit: type=1800 audit(1572817496.405:27): pid=7029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. 2019/11/03 21:45:08 fuzzer started 2019/11/03 21:45:09 dialing manager at 10.128.0.105:42255 2019/11/03 21:45:09 syscalls: 2553 2019/11/03 21:45:09 code coverage: enabled 2019/11/03 21:45:09 comparison tracing: enabled 2019/11/03 21:45:09 extra coverage: extra coverage is not supported by the kernel 2019/11/03 21:45:09 setuid sandbox: enabled 2019/11/03 21:45:09 namespace sandbox: enabled 2019/11/03 21:45:09 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 21:45:09 fault injection: enabled 2019/11/03 21:45:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 21:45:09 net packet injection: enabled 2019/11/03 21:45:09 net device setup: enabled 2019/11/03 21:45:09 concurrency sanitizer: enabled 2019/11/03 21:45:09 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/03 21:45:15 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'tomoyo_supervisor' '__splice_from_pipe' 'blk_stat_add' 'blk_mq_sched_dispatch_requests' '__nf_ct_refresh_acct' 'ext4_free_inode' 'tcp_add_backlog' 'blk_mq_get_request' 'tcp_poll' 'run_timer_softirq' '__nf_conntrack_find_get' 'find_get_pages_range_tag' 'add_timer' 'taskstats_exit' 'snapshot_refaults' 'ep_poll' 'pipe_poll' 'get_wchan' 'generic_write_end' 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'generic_fillattr' 'task_dump_owner' 'generic_permission' 'audit_log_start' 'find_next_bit' 'vm_area_dup' 'fsnotify' 'ext4_nonda_switch' 'pid_update_inode' 'ktime_get_real_seconds' '__tcp_select_window' syzkaller login: [ 65.545538][ T0] ================================================================== [ 65.553704][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 65.560628][ T0] [ 65.562957][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by task 7179 on cpu 0: [ 65.570502][ T0] mod_timer+0x50d/0x7a0 [ 65.574745][ T0] sk_reset_timer+0x2d/0x70 [ 65.579248][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 65.584449][ T0] tcp_rearm_rto+0x4f/0x60 [ 65.588870][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 65.594323][ T0] tcp_write_xmit+0xa16/0x3080 [ 65.599096][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 65.604639][ T0] tcp_push+0x1e9/0x3d0 [ 65.608796][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 65.613984][ T0] tcp_sendmsg+0x39/0x60 [ 65.618214][ T0] inet_sendmsg+0x6d/0x90 [ 65.622544][ T0] sock_sendmsg+0x9f/0xc0 [ 65.626860][ T0] sock_write_iter+0x16b/0x210 [ 65.631610][ T0] new_sync_write+0x388/0x4a0 [ 65.636279][ T0] [ 65.638598][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 65.645957][ T0] timer_clear_idle+0x42/0x50 [ 65.650625][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 65.656510][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 65.661612][ T0] do_idle+0xb1/0x280 [ 65.665589][ T0] cpu_startup_entry+0x1b/0x20 [ 65.670341][ T0] start_secondary+0x208/0x260 [ 65.675115][ T0] secondary_startup_64+0xa4/0xb0 [ 65.680124][ T0] [ 65.682443][ T0] Reported by Kernel Concurrency Sanitizer on: [ 65.688596][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 65.695698][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.705775][ T0] ================================================================== [ 65.713825][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 65.720404][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 65.727612][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.737652][ T0] Call Trace: [ 65.740938][ T0] dump_stack+0xf5/0x159 [ 65.745171][ T0] panic+0x210/0x640 [ 65.749089][ T0] ? vprintk_func+0x8d/0x140 [ 65.753681][ T0] kcsan_report.cold+0xc/0x10 [ 65.758369][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 65.763925][ T0] __tsan_write1+0x32/0x40 [ 65.768344][ T0] timer_clear_idle+0x42/0x50 [ 65.773022][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 65.778922][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 65.784029][ T0] do_idle+0xb1/0x280 [ 65.788007][ T0] ? complete+0x44/0x50 [ 65.792169][ T0] cpu_startup_entry+0x1b/0x20 [ 65.796935][ T0] start_secondary+0x208/0x260 [ 65.801697][ T0] secondary_startup_64+0xa4/0xb0 [ 65.808011][ T0] Kernel Offset: disabled [ 65.812328][ T0] Rebooting in 86400 seconds..