[ 50.964584][ T26] audit: type=1800 audit(1572956994.714:27): 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 [ 50.984863][ T26] audit: type=1800 audit(1572956994.714:28): 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. [ 51.870943][ T26] audit: type=1800 audit(1572956995.694:29): 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 [ 51.891032][ T26] audit: type=1800 audit(1572956995.694:30): 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 '10.128.0.136' (ECDSA) to the list of known hosts. 2019/11/05 12:30:06 fuzzer started 2019/11/05 12:30:07 dialing manager at 10.128.0.105:39277 2019/11/05 12:30:07 syscalls: 2553 2019/11/05 12:30:07 code coverage: enabled 2019/11/05 12:30:07 comparison tracing: enabled 2019/11/05 12:30:07 extra coverage: extra coverage is not supported by the kernel 2019/11/05 12:30:07 setuid sandbox: enabled 2019/11/05 12:30:07 namespace sandbox: enabled 2019/11/05 12:30:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/05 12:30:07 fault injection: enabled 2019/11/05 12:30:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/05 12:30:07 net packet injection: enabled 2019/11/05 12:30:07 net device setup: enabled 2019/11/05 12:30:07 concurrency sanitizer: enabled 2019/11/05 12:30:07 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 64.599887][ T7979] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/05 12:30:11 adding functions to KCSAN blacklist: 'copy_process' '__hrtimer_run_queues' 'ep_poll' 'task_dump_owner' 'pipe_poll' 'generic_write_end' 'tick_sched_do_timer' 'taskstats_exit' 'poll_schedule_timeout' 'kauditd_thread' 'ep_insert' '__ext4_new_inode' 'vm_area_dup' 'ext4_free_inode' 'tomoyo_supervisor' 'ktime_get_real_seconds' 'generic_permission' 'do_exit' 'dd_has_work' 'xas_clear_mark' 'timer_clear_idle' 'tcp_add_backlog' 'pid_update_inode' 'tick_do_update_jiffies64' 'blk_mq_dispatch_rq_list' 'ktime_get_seconds' 'find_next_bit' 'ext4_nonda_switch' [ 84.095968][ T0] ================================================================== [ 84.104142][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 84.112724][ T0] [ 84.115071][ T0] write to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 0: [ 84.122497][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 84.128049][ T0] do_idle+0x1a5/0x280 [ 84.132128][ T0] cpu_startup_entry+0x1b/0x20 [ 84.136896][ T0] rest_init+0xec/0xf6 [ 84.140965][ T0] arch_call_rest_init+0x17/0x37 [ 84.145906][ T0] start_kernel+0x838/0x85e [ 84.150419][ T0] x86_64_start_reservations+0x29/0x2b [ 84.155888][ T0] x86_64_start_kernel+0x72/0x76 [ 84.160822][ T0] secondary_startup_64+0xa4/0xb0 [ 84.165839][ T0] [ 84.168184][ T0] read to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 1: [ 84.175521][ T0] tick_nohz_next_event+0x19d/0x370 [ 84.180716][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 84.186267][ T0] do_idle+0x1a5/0x280 [ 84.190384][ T0] cpu_startup_entry+0x1b/0x20 [ 84.195156][ T0] start_secondary+0x208/0x260 [ 84.199935][ T0] secondary_startup_64+0xa4/0xb0 [ 84.204956][ T0] [ 84.207279][ T0] Reported by Kernel Concurrency Sanitizer on: [ 84.213422][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 84.220523][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.230589][ T0] ================================================================== [ 84.238663][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 84.245252][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 84.252353][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.262522][ T0] Call Trace: [ 84.265818][ T0] dump_stack+0xf5/0x159 [ 84.270066][ T0] panic+0x210/0x640 [ 84.273972][ T0] ? vprintk_func+0x8d/0x140 [ 84.278569][ T0] kcsan_report.cold+0xc/0xe [ 84.283190][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 84.288604][ T0] __tsan_read4+0x145/0x1f0 [ 84.293154][ T0] tick_nohz_next_event+0x19d/0x370 [ 84.298366][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 84.303909][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 84.310163][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 84.316443][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 84.321935][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 84.328226][ T0] do_idle+0x1a5/0x280 [ 84.332304][ T0] cpu_startup_entry+0x1b/0x20 [ 84.337083][ T0] start_secondary+0x208/0x260 [ 84.341889][ T0] secondary_startup_64+0xa4/0xb0 [ 84.348185][ T0] Kernel Offset: disabled [ 84.352510][ T0] Rebooting in 86400 seconds..