[ 53.653598][ T26] audit: type=1800 audit(1573339783.603:26): pid=7936 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 53.674126][ T26] audit: type=1800 audit(1573339783.613:27): pid=7936 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 53.752279][ T26] audit: type=1800 audit(1573339783.723:28): pid=7936 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. [ 54.716638][ T26] audit: type=1800 audit(1573339784.683:29): pid=7936 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 '10.128.0.133' (ECDSA) to the list of known hosts. 2019/11/09 22:49:52 fuzzer started 2019/11/09 22:49:54 dialing manager at 10.128.0.105:33901 2019/11/09 22:49:55 syscalls: 2553 2019/11/09 22:49:55 code coverage: enabled 2019/11/09 22:49:55 comparison tracing: enabled 2019/11/09 22:49:55 extra coverage: extra coverage is not supported by the kernel 2019/11/09 22:49:55 setuid sandbox: enabled 2019/11/09 22:49:55 namespace sandbox: enabled 2019/11/09 22:49:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/09 22:49:55 fault injection: enabled 2019/11/09 22:49:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/09 22:49:55 net packet injection: enabled 2019/11/09 22:49:55 net device setup: enabled 2019/11/09 22:49:55 concurrency sanitizer: enabled 2019/11/09 22:49:55 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 68.115362][ T8107] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/09 22:49:58 adding functions to KCSAN blacklist: 'blk_mq_dispatch_rq_list' 'tcp_add_backlog' 'find_next_bit' '__ext4_new_inode' 'generic_write_end' 'ep_poll' 'wbt_issue' 'vm_area_dup' 'ktime_get_real_seconds' 'tomoyo_supervisor' 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' 'run_timer_softirq' 'mod_timer' '__hrtimer_run_queues' 'xas_clear_mark' 'generic_permission' 'tick_sched_do_timer' 'poll_schedule_timeout' 'ext4_mark_iloc_dirty' [ 69.470291][ T0] ================================================================== [ 69.478437][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 69.487008][ T0] [ 69.489334][ T0] write to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 0: [ 69.496734][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 69.502271][ T0] do_idle+0x1a5/0x280 [ 69.506330][ T0] cpu_startup_entry+0x1b/0x20 [ 69.511081][ T0] rest_init+0xec/0xf6 [ 69.515149][ T0] arch_call_rest_init+0x17/0x37 [ 69.520075][ T0] start_kernel+0x838/0x85e [ 69.524562][ T0] x86_64_start_reservations+0x29/0x2b [ 69.530010][ T0] x86_64_start_kernel+0x72/0x76 [ 69.534933][ T0] secondary_startup_64+0xa4/0xb0 [ 69.539930][ T0] [ 69.542242][ T0] read to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 1: [ 69.549512][ T0] tick_nohz_next_event+0x19d/0x370 [ 69.554698][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 69.560231][ T0] do_idle+0x1a5/0x280 [ 69.564294][ T0] cpu_startup_entry+0x1b/0x20 [ 69.569130][ T0] start_secondary+0x208/0x260 [ 69.574027][ T0] secondary_startup_64+0xa4/0xb0 [ 69.579029][ T0] [ 69.581340][ T0] Reported by Kernel Concurrency Sanitizer on: [ 69.587484][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 69.594694][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.604866][ T0] ================================================================== [ 69.612912][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 69.619506][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 69.626591][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.636628][ T0] Call Trace: [ 69.639922][ T0] dump_stack+0xf5/0x159 [ 69.644156][ T0] panic+0x210/0x640 [ 69.648043][ T0] ? vprintk_func+0x8d/0x140 [ 69.652625][ T0] kcsan_report.cold+0xc/0xe [ 69.657464][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 69.662822][ T0] __tsan_read4+0x145/0x1f0 [ 69.667320][ T0] tick_nohz_next_event+0x19d/0x370 [ 69.672532][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 69.678216][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.684471][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.690718][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 69.696176][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.702421][ T0] do_idle+0x1a5/0x280 [ 69.706495][ T0] cpu_startup_entry+0x1b/0x20 [ 69.711335][ T0] start_secondary+0x208/0x260 [ 69.716091][ T0] secondary_startup_64+0xa4/0xb0 [ 69.722656][ T0] Kernel Offset: disabled [ 69.726994][ T0] Rebooting in 86400 seconds..