[ 51.023156][ T27] audit: type=1800 audit(1581351894.034:27): pid=7855 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.043466][ T27] audit: type=1800 audit(1581351894.034:28): pid=7855 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. [ 52.049550][ T27] audit: type=1800 audit(1581351895.094:29): pid=7855 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 [ 52.069833][ T27] audit: type=1800 audit(1581351895.094:30): pid=7855 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 '10.128.0.193' (ECDSA) to the list of known hosts. 2020/02/10 16:25:03 fuzzer started 2020/02/10 16:25:05 dialing manager at 10.128.0.105:43415 2020/02/10 16:25:10 syscalls: 2904 2020/02/10 16:25:10 code coverage: enabled 2020/02/10 16:25:10 comparison tracing: enabled 2020/02/10 16:25:10 extra coverage: enabled 2020/02/10 16:25:10 setuid sandbox: enabled 2020/02/10 16:25:10 namespace sandbox: enabled 2020/02/10 16:25:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/10 16:25:10 fault injection: enabled 2020/02/10 16:25:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/10 16:25:10 net packet injection: enabled 2020/02/10 16:25:10 net device setup: enabled 2020/02/10 16:25:10 concurrency sanitizer: enabled 2020/02/10 16:25:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/02/10 16:25:12 adding functions to KCSAN blacklist: 'blk_mq_dispatch_rq_list' 'alloc_pid' 'ext4_nonda_switch' 'mod_timer' 'tick_nohz_next_event' '__ext4_new_inode' 'generic_write_end' 'add_timer' 'tomoyo_supervisor' 'ext4_free_inodes_count' 'tick_sched_do_timer' 'timer_clear_idle' 'inode_sync_complete' 'find_get_pages_range_tag' 'ext4_free_inode' 'taskstats_exit' 'do_signal_stop' 'generic_fillattr' 'blk_mq_get_request' 'ktime_get_real_seconds' 'do_readlinkat' 'xas_clear_mark' 'tick_nohz_idle_stop_tick' 'ep_poll' syzkaller login: [ 71.322925][ T0] ================================================================== [ 71.331122][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 71.340050][ T0] [ 71.342398][ T0] write to 0xffffffff8624d7c8 of 8 bytes by interrupt on cpu 1: [ 71.350044][ T0] tick_do_update_jiffies64+0x100/0x250 [ 71.355600][ T0] tick_sched_do_timer+0xd4/0xe0 [ 71.360551][ T0] tick_sched_timer+0x43/0xe0 [ 71.365243][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 71.370449][ T0] hrtimer_interrupt+0x22a/0x480 [ 71.375401][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 71.380880][ T0] apic_timer_interrupt+0xf/0x20 [ 71.385847][ T0] __sanitizer_cov_trace_pc+0x0/0x50 [ 71.391141][ T0] __netif_receive_skb_list_core+0x299/0x5c0 [ 71.397132][ T0] netif_receive_skb_list_internal+0x5d8/0x830 [ 71.403317][ T0] gro_normal_list.part.0+0x3a/0xb0 [ 71.408516][ T0] gro_normal_one+0x162/0x170 [ 71.413203][ T0] napi_gro_receive+0x288/0x300 [ 71.418065][ T0] receive_buf+0x284/0x30b0 [ 71.422590][ T0] virtnet_poll+0x436/0x7d0 [ 71.427099][ T0] net_rx_action+0x3ae/0xa90 [ 71.431714][ T0] __do_softirq+0x115/0x33f [ 71.436217][ T0] irq_exit+0xbb/0xe0 [ 71.440200][ T0] do_IRQ+0x81/0x130 [ 71.444210][ T0] ret_from_intr+0x0/0x21 [ 71.448565][ T0] [ 71.450899][ T0] read to 0xffffffff8624d7c8 of 8 bytes by task 0 on cpu 0: [ 71.458199][ T0] tick_do_update_jiffies64+0x2b/0x250 [ 71.463684][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 71.469616][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 71.475697][ T0] do_idle+0xb1/0x290 [ 71.479692][ T0] cpu_startup_entry+0x1b/0x20 [ 71.484461][ T0] rest_init+0xec/0xf6 [ 71.488554][ T0] arch_call_rest_init+0x17/0x37 [ 71.493492][ T0] start_kernel+0x838/0x85e [ 71.498093][ T0] x86_64_start_reservations+0x29/0x2b [ 71.503565][ T0] x86_64_start_kernel+0x72/0x76 [ 71.508560][ T0] secondary_startup_64+0xa4/0xb0 [ 71.513588][ T0] [ 71.515919][ T0] Reported by Kernel Concurrency Sanitizer on: [ 71.522094][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 71.530000][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.540069][ T0] ================================================================== [ 71.548186][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 71.554817][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 71.562746][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.572825][ T0] Call Trace: [ 71.576120][ T0] dump_stack+0x11d/0x181 [ 71.580457][ T0] panic+0x210/0x640 [ 71.584370][ T0] ? vprintk_func+0x8d/0x140 [ 71.588980][ T0] kcsan_report.cold+0xc/0x15 [ 71.593800][ T0] kcsan_setup_watchpoint+0x2e2/0x380 [ 71.599190][ T0] __tsan_read8+0xc6/0x100 [ 71.603624][ T0] tick_do_update_jiffies64+0x2b/0x250 [ 71.609102][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 71.615054][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 71.620184][ T0] do_idle+0xb1/0x290 [ 71.624283][ T0] cpu_startup_entry+0x1b/0x20 [ 71.630711][ T0] rest_init+0xec/0xf6 [ 71.634800][ T0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 71.642036][ T0] arch_call_rest_init+0x17/0x37 [ 71.647009][ T0] start_kernel+0x838/0x85e [ 71.651541][ T0] x86_64_start_reservations+0x29/0x2b [ 71.657135][ T0] x86_64_start_kernel+0x72/0x76 [ 71.662085][ T0] secondary_startup_64+0xa4/0xb0 [ 71.668717][ T0] Kernel Offset: disabled [ 71.673052][ T0] Rebooting in 86400 seconds..