[ 58.527896][ T27] audit: type=1800 audit(1581363420.003:27): pid=7774 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 58.551500][ T27] audit: type=1800 audit(1581363420.023:28): pid=7774 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. [ 59.174414][ T27] audit: type=1800 audit(1581363420.743:29): pid=7774 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 [ 59.194688][ T27] audit: type=1800 audit(1581363420.743:30): pid=7774 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2020/02/10 19:37:09 fuzzer started 2020/02/10 19:37:10 dialing manager at 10.128.0.105:43641 2020/02/10 19:37:10 syscalls: 2904 2020/02/10 19:37:10 code coverage: enabled 2020/02/10 19:37:10 comparison tracing: enabled 2020/02/10 19:37:10 extra coverage: enabled 2020/02/10 19:37:10 setuid sandbox: enabled 2020/02/10 19:37:10 namespace sandbox: enabled 2020/02/10 19:37:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/10 19:37:10 fault injection: enabled 2020/02/10 19:37:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/10 19:37:10 net packet injection: enabled 2020/02/10 19:37:10 net device setup: enabled 2020/02/10 19:37:10 concurrency sanitizer: enabled 2020/02/10 19:37:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/02/10 19:37:12 adding functions to KCSAN blacklist: 'generic_write_end' 'ktime_get_real_seconds' 'ext4_free_inode' 'add_timer' 'ext4_nonda_switch' '__ext4_new_inode' 'run_timer_softirq' 'tomoyo_supervisor' 'find_get_pages_range_tag' 'taskstats_exit' 'xas_clear_mark' 'tick_do_update_jiffies64' 'mod_timer' 'ep_poll' 'ext4_free_inodes_count' 'ext4_has_free_clusters' 'blk_mq_sched_dispatch_requests' syzkaller login: [ 98.527682][ T0] ================================================================== [ 98.536385][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 98.545098][ T0] [ 98.547677][ T0] write to 0xffffffff85ebb050 of 4 bytes by interrupt on cpu 1: [ 98.555529][ T0] tick_sched_do_timer+0xc0/0xe0 [ 98.560585][ T0] tick_sched_timer+0x43/0xe0 [ 98.565575][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 98.571062][ T0] hrtimer_interrupt+0x22a/0x480 [ 98.576737][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 98.582550][ T0] apic_timer_interrupt+0xf/0x20 [ 98.587831][ T0] __tsan_func_exit+0x0/0x10 [ 98.592557][ T0] nf_hook_slow_list+0x139/0x285 [ 98.597780][ T0] ip_sublist_rcv+0x510/0x550 [ 98.602570][ T0] ip_list_rcv+0x2f5/0x322 [ 98.608678][ T0] __netif_receive_skb_list_core+0x350/0x5c0 [ 98.615035][ T0] netif_receive_skb_list_internal+0x5d8/0x830 [ 98.621532][ T0] gro_normal_list.part.0+0x3a/0xb0 [ 98.626881][ T0] gro_normal_one+0x162/0x170 [ 98.631892][ T0] napi_gro_receive+0x288/0x300 [ 98.636795][ T0] receive_buf+0x284/0x30b0 [ 98.641641][ T0] virtnet_poll+0x436/0x7d0 [ 98.646714][ T0] net_rx_action+0x3ae/0xa90 [ 98.651576][ T0] __do_softirq+0x115/0x33f [ 98.656188][ T0] run_ksoftirqd+0x46/0x60 [ 98.660634][ T0] smpboot_thread_fn+0x37d/0x4a0 [ 98.665691][ T0] kthread+0x1d4/0x200 [ 98.669799][ T0] ret_from_fork+0x1f/0x30 [ 98.674516][ T0] [ 98.676861][ T0] read to 0xffffffff85ebb050 of 4 bytes by task 0 on cpu 0: [ 98.684327][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 98.690367][ T0] do_idle+0x1b8/0x290 [ 98.694555][ T0] cpu_startup_entry+0x1b/0x20 [ 98.700378][ T0] rest_init+0xec/0xf6 [ 98.704642][ T0] arch_call_rest_init+0x17/0x37 [ 98.709601][ T0] start_kernel+0x838/0x85e [ 98.714216][ T0] x86_64_start_reservations+0x29/0x2b [ 98.719958][ T0] x86_64_start_kernel+0x72/0x76 [ 98.724916][ T0] secondary_startup_64+0xa4/0xb0 [ 98.730079][ T0] [ 98.732578][ T0] Reported by Kernel Concurrency Sanitizer on: [ 98.739314][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 98.747516][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.758139][ T0] ================================================================== [ 98.766313][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 98.773556][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 98.781591][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.793059][ T0] Call Trace: [ 98.796557][ T0] dump_stack+0x11d/0x181 [ 98.801084][ T0] panic+0x210/0x640 [ 98.805007][ T0] ? vprintk_func+0x8d/0x140 [ 98.809631][ T0] kcsan_report.cold+0xc/0x15 [ 98.814334][ T0] kcsan_setup_watchpoint+0x2e2/0x380 [ 98.819984][ T0] __tsan_read4+0xc6/0x100 [ 98.824426][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 98.830126][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.836406][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.842833][ T0] do_idle+0x1b8/0x290 [ 98.847201][ T0] cpu_startup_entry+0x1b/0x20 [ 98.852129][ T0] rest_init+0xec/0xf6 [ 98.856456][ T0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 98.863906][ T0] arch_call_rest_init+0x17/0x37 [ 98.869171][ T0] start_kernel+0x838/0x85e [ 98.874127][ T0] x86_64_start_reservations+0x29/0x2b [ 98.880413][ T0] x86_64_start_kernel+0x72/0x76 [ 98.885662][ T0] secondary_startup_64+0xa4/0xb0 [ 98.892772][ T0] Kernel Offset: disabled [ 98.897424][ T0] Rebooting in 86400 seconds..