[ 52.156952][ T26] audit: type=1800 audit(1573096060.791:26): pid=7920 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 52.185476][ T26] audit: type=1800 audit(1573096060.801:27): pid=7920 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 52.208215][ T26] audit: type=1800 audit(1573096060.801:28): pid=7920 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. [ 53.077586][ T26] audit: type=1800 audit(1573096061.751:29): pid=7920 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 '10.128.0.108' (ECDSA) to the list of known hosts. 2019/11/07 03:07:52 fuzzer started 2019/11/07 03:07:54 dialing manager at 10.128.0.105:34849 2019/11/07 03:07:54 syscalls: 2553 2019/11/07 03:07:54 code coverage: enabled 2019/11/07 03:07:54 comparison tracing: enabled 2019/11/07 03:07:54 extra coverage: extra coverage is not supported by the kernel 2019/11/07 03:07:54 setuid sandbox: enabled 2019/11/07 03:07:54 namespace sandbox: enabled 2019/11/07 03:07:54 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/07 03:07:54 fault injection: enabled 2019/11/07 03:07:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/07 03:07:54 net packet injection: enabled 2019/11/07 03:07:54 net device setup: enabled 2019/11/07 03:07:54 concurrency sanitizer: enabled 2019/11/07 03:07:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/07 03:07:57 adding functions to KCSAN blacklist: 'tick_do_update_jiffies64' 'ext4_free_inode' 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'tick_nohz_idle_stop_tick' 'pid_update_inode' 'echo_char' 'ep_poll' 'audit_log_start' 'blk_mq_get_request' 'tomoyo_supervisor' 'run_timer_softirq' 'tcp_add_backlog' 'generic_permission' 'taskstats_exit' 'fasync_remove_entry' '__hrtimer_run_queues' 'ktime_get_real_seconds' 'find_next_bit' syzkaller login: [ 70.429110][ C0] ================================================================== [ 70.437304][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 70.445366][ C0] [ 70.447712][ C0] write to 0xffffffff85cb26d0 of 4 bytes by interrupt on cpu 1: [ 70.455366][ C0] tick_sched_do_timer+0xc0/0xe0 [ 70.460330][ C0] tick_sched_timer+0x43/0xe0 [ 70.465045][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 70.470255][ C0] hrtimer_interrupt+0x22a/0x480 [ 70.475208][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.480694][ C0] apic_timer_interrupt+0xf/0x20 [ 70.485914][ C0] __tsan_unaligned_write4+0x51/0x1f0 [ 70.491304][ C0] __build_skb_around+0x79/0x1b0 [ 70.496405][ C0] __build_skb+0x63/0x80 [ 70.500670][ C0] __napi_alloc_skb+0x18a/0x210 [ 70.505737][ C0] page_to_skb+0x8d/0x480 [ 70.510088][ C0] receive_buf+0x17c7/0x30b0 [ 70.514960][ C0] virtnet_poll+0x436/0x7d0 [ 70.519488][ C0] net_rx_action+0x3ae/0xa90 [ 70.524195][ C0] __do_softirq+0x115/0x33f [ 70.528716][ C0] irq_exit+0xbb/0xe0 [ 70.532727][ C0] do_IRQ+0xa6/0x180 [ 70.536631][ C0] ret_from_intr+0x0/0x19 [ 70.540975][ C0] [ 70.543315][ C0] read to 0xffffffff85cb26d0 of 4 bytes by interrupt on cpu 0: [ 70.550984][ C0] tick_sched_do_timer+0x33/0xe0 [ 70.556122][ C0] tick_sched_timer+0x43/0xe0 [ 70.560895][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 70.566208][ C0] hrtimer_interrupt+0x22a/0x480 [ 70.571188][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.576664][ C0] apic_timer_interrupt+0xf/0x20 [ 70.581636][ C0] native_safe_halt+0xe/0x10 [ 70.586515][ C0] arch_cpu_idle+0x1f/0x30 [ 70.590970][ C0] default_idle_call+0x1e/0x40 [ 70.595750][ C0] do_idle+0x1af/0x280 [ 70.599865][ C0] cpu_startup_entry+0x1b/0x20 [ 70.604648][ C0] rest_init+0xec/0xf6 [ 70.608760][ C0] arch_call_rest_init+0x17/0x37 [ 70.613721][ C0] start_kernel+0x838/0x85e [ 70.618257][ C0] x86_64_start_reservations+0x29/0x2b [ 70.623863][ C0] x86_64_start_kernel+0x72/0x76 [ 70.628935][ C0] secondary_startup_64+0xa4/0xb0 [ 70.633956][ C0] [ 70.636290][ C0] Reported by Kernel Concurrency Sanitizer on: [ 70.642452][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 70.649730][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.660035][ C0] ================================================================== [ 70.668100][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 70.674680][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 70.681779][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.691953][ C0] Call Trace: [ 70.695235][ C0] [ 70.698083][ C0] dump_stack+0xf5/0x159 [ 70.702314][ C0] panic+0x210/0x640 [ 70.706208][ C0] ? vprintk_func+0x8d/0x140 [ 70.710804][ C0] kcsan_report.cold+0xc/0xe [ 70.715557][ C0] kcsan_setup_watchpoint+0x3fe/0x410 [ 70.721013][ C0] __tsan_read4+0x145/0x1f0 [ 70.725594][ C0] tick_sched_do_timer+0x33/0xe0 [ 70.730531][ C0] tick_sched_timer+0x43/0xe0 [ 70.735210][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 70.740409][ C0] ? tick_sched_handle+0x100/0x100 [ 70.745785][ C0] hrtimer_interrupt+0x22a/0x480 [ 70.750714][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.756165][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 70.762004][ C0] apic_timer_interrupt+0xf/0x20 [ 70.766930][ C0] [ 70.769861][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 70.775228][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 6c 00 4c 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 5c 00 4c 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 32 36 a4 fc e8 4d 82 b8 fd 0f [ 70.794910][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 70.803310][ C0] RAX: 00000000000000b0 RBX: ffffffff85a2b780 RCX: 0000ffffffffffff [ 70.811263][ C0] RDX: 0000000000000000 RSI: 0000000000000016 RDI: ffffffff85a56378 [ 70.819477][ C0] RBP: ffffffff85a03e18 R08: 0000ffff85a56378 R09: 00000000aaaaaaab [ 70.827433][ C0] R10: 0000ffff85a5637f R11: 0000000000000000 R12: 0000000000000000 [ 70.835507][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000 [ 70.843508][ C0] ? default_idle+0x50/0x230 [ 70.848112][ C0] arch_cpu_idle+0x1f/0x30 [ 70.852516][ C0] default_idle_call+0x1e/0x40 [ 70.857267][ C0] do_idle+0x1af/0x280 [ 70.861324][ C0] cpu_startup_entry+0x1b/0x20 [ 70.866075][ C0] rest_init+0xec/0xf6 [ 70.870145][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 70.877521][ C0] arch_call_rest_init+0x17/0x37 [ 70.882476][ C0] start_kernel+0x838/0x85e [ 70.886991][ C0] x86_64_start_reservations+0x29/0x2b [ 70.892440][ C0] x86_64_start_kernel+0x72/0x76 [ 70.897389][ C0] secondary_startup_64+0xa4/0xb0 [ 70.904372][ C0] Kernel Offset: disabled [ 70.908753][ C0] Rebooting in 86400 seconds..