[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.887781][ T25] audit: type=1800 audit(1571152123.502:25): pid=7023 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.916188][ T25] audit: type=1800 audit(1571152123.512:26): pid=7023 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.971037][ T25] audit: type=1800 audit(1571152123.592:27): pid=7023 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. 2019/10/15 15:08:54 fuzzer started 2019/10/15 15:08:55 dialing manager at 10.128.0.105:38903 2019/10/15 15:08:55 syscalls: 2523 2019/10/15 15:08:55 code coverage: enabled 2019/10/15 15:08:55 comparison tracing: enabled 2019/10/15 15:08:55 extra coverage: extra coverage is not supported by the kernel 2019/10/15 15:08:55 setuid sandbox: enabled 2019/10/15 15:08:55 namespace sandbox: enabled 2019/10/15 15:08:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 15:08:55 fault injection: enabled 2019/10/15 15:08:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 15:08:55 net packet injection: enabled 2019/10/15 15:08:55 net device setup: enabled 2019/10/15 15:08:55 concurrency sanitizer: enabled syzkaller login: [ 47.898712][ C0] ================================================================== [ 47.906831][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 47.914867][ C0] [ 47.917178][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 47.924802][ C0] tick_sched_do_timer+0xc0/0xe0 [ 47.929719][ C0] tick_sched_timer+0x43/0xe0 [ 47.934377][ C0] __hrtimer_run_queues+0x288/0x600 [ 47.939556][ C0] hrtimer_interrupt+0x22a/0x480 [ 47.944486][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 47.949946][ C0] apic_timer_interrupt+0xf/0x20 [ 47.954853][ C0] [ 47.957162][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 47.964684][ C0] tick_sched_do_timer+0x33/0xe0 [ 47.969624][ C0] tick_sched_timer+0x43/0xe0 [ 47.974289][ C0] __hrtimer_run_queues+0x288/0x600 [ 47.981467][ C0] hrtimer_interrupt+0x22a/0x480 [ 47.986383][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 47.991822][ C0] apic_timer_interrupt+0xf/0x20 [ 47.996740][ C0] __kcsan_check_watchpoint+0xa3/0x180 [ 48.002183][ C0] __tsan_read1+0x15/0x30 [ 48.006494][ C0] netdev_pick_tx+0xa2/0x5e0 [ 48.011065][ C0] netdev_core_pick_tx+0x1a0/0x1b0 [ 48.016156][ C0] __dev_queue_xmit+0x4ba/0x1b90 [ 48.021082][ C0] dev_queue_xmit+0x21/0x30 [ 48.025570][ C0] ip_finish_output2+0x834/0xe40 [ 48.030481][ C0] [ 48.032785][ C0] Reported by Kernel Concurrency Sanitizer on: [ 48.039354][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 48.046786][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.056817][ C0] ================================================================== [ 48.064856][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 48.071425][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 48.078335][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.088365][ C0] Call Trace: [ 48.091630][ C0] [ 48.094469][ C0] dump_stack+0xf5/0x159 [ 48.098708][ C0] panic+0x209/0x639 [ 48.102590][ C0] ? netdev_pick_tx+0xa2/0x5e0 [ 48.107344][ C0] ? vprintk_func+0x8d/0x140 [ 48.111916][ C0] kcsan_report.cold+0xc/0x1b [ 48.116577][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.122108][ C0] __tsan_read4+0x2c/0x30 [ 48.126421][ C0] tick_sched_do_timer+0x33/0xe0 [ 48.131344][ C0] tick_sched_timer+0x43/0xe0 [ 48.136005][ C0] __hrtimer_run_queues+0x288/0x600 [ 48.141185][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 48.146284][ C0] hrtimer_interrupt+0x22a/0x480 [ 48.151212][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 48.156653][ C0] apic_timer_interrupt+0xf/0x20 [ 48.161567][ C0] [ 48.164489][ C0] RIP: 0010:__kcsan_check_watchpoint+0xa3/0x180 [ 48.170716][ C0] Code: 4c 37 ff 8d 42 01 48 89 c2 49 0f af c2 89 d3 48 c1 e8 21 8d 04 40 29 c3 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 eb 1a 44 01 d8 <83> e0 3f 44 29 d8 48 98 4c 8d 1c c5 20 2c 04 86 48 8b 04 c5 20 2c [ 48.190301][ C0] RSP: 0018:ffffc90000cb3118 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 48.198694][ C0] RAX: 0000000000000009 RBX: 0000000000000000 RCX: 0000ffffffffffff [ 48.206820][ C0] RDX: 0000000000000003 RSI: 000000000000000a RDI: 0000888124e4ac80 [ 48.214781][ C0] RBP: ffffc90000cb3140 R08: 0000000000000000 R09: 0000888124e4ac80 [ 48.222738][ C0] R10: 00000000aaaaaaab R11: 0000000000000000 R12: 0000000000000000 [ 48.230697][ C0] R13: ffff888124e4ac80 R14: 0000000000000001 R15: 0000000000000000 [ 48.238674][ C0] __tsan_read1+0x15/0x30 [ 48.242993][ C0] netdev_pick_tx+0xa2/0x5e0 [ 48.247572][ C0] netdev_core_pick_tx+0x1a0/0x1b0 [ 48.252668][ C0] __dev_queue_xmit+0x4ba/0x1b90 [ 48.257589][ C0] ? ipt_do_table+0x8e6/0xe40 [ 48.262247][ C0] ? __tsan_read1+0x2c/0x30 [ 48.266738][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 48.272352][ C0] ? __tsan_write4+0x32/0x40 [ 48.276923][ C0] dev_queue_xmit+0x21/0x30 [ 48.281413][ C0] ip_finish_output2+0x834/0xe40 [ 48.286339][ C0] __ip_finish_output+0x23a/0x490 [ 48.291349][ C0] ip_finish_output+0x41/0x160 [ 48.296097][ C0] ip_output+0xdf/0x210 [ 48.300241][ C0] ? __ip_finish_output+0x490/0x490 [ 48.305424][ C0] ip_local_out+0x74/0x90 [ 48.309735][ C0] __ip_queue_xmit+0x3a8/0xa40 [ 48.314483][ C0] ip_queue_xmit+0x45/0x60 [ 48.318886][ C0] __tcp_transmit_skb+0xdeb/0x1cd0 [ 48.323993][ C0] __tcp_send_ack+0x246/0x300 [ 48.328661][ C0] tcp_send_ack+0x34/0x40 [ 48.332973][ C0] __tcp_ack_snd_check+0xd9/0x4e0 [ 48.337983][ C0] tcp_rcv_established+0xce9/0xf50 [ 48.343092][ C0] ? ipv4_dst_check+0xc6/0xf0 [ 48.347754][ C0] tcp_v4_do_rcv+0x381/0x4e0 [ 48.352332][ C0] tcp_v4_rcv+0x1a03/0x1bf0 [ 48.356819][ C0] ? __tsan_read8+0x2c/0x30 [ 48.361311][ C0] ip_protocol_deliver_rcu+0x51/0x470 [ 48.366670][ C0] ip_local_deliver_finish+0x110/0x140 [ 48.372120][ C0] ip_local_deliver+0x133/0x210 [ 48.376958][ C0] ? ip_protocol_deliver_rcu+0x470/0x470 [ 48.382574][ C0] ip_rcv_finish+0x121/0x160 [ 48.387148][ C0] ip_rcv+0x18f/0x1a0 [ 48.391124][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 48.395954][ C0] ? ip_local_deliver+0x210/0x210 [ 48.401046][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.406750][ C0] __netif_receive_skb+0x37/0xf0 [ 48.411671][ C0] netif_receive_skb_internal+0x59/0x190 [ 48.417289][ C0] napi_gro_receive+0x28f/0x330 [ 48.422123][ C0] receive_buf+0x284/0x30b0 [ 48.426608][ C0] ? __tsan_write8+0x32/0x40 [ 48.431187][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 48.436626][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 48.442241][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 48.447860][ C0] virtnet_poll+0x436/0x7d0 [ 48.452359][ C0] net_rx_action+0x3ae/0xa50 [ 48.456940][ C0] __do_softirq+0x115/0x33f [ 48.461440][ C0] ? takeover_tasklets+0x250/0x250 [ 48.466531][ C0] run_ksoftirqd+0x46/0x60 [ 48.470929][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 48.475852][ C0] kthread+0x1d4/0x200 [ 48.479905][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 48.485864][ C0] ? kthread_bind+0x50/0x50 [ 48.490351][ C0] ret_from_fork+0x1f/0x30 [ 48.496113][ C0] Kernel Offset: disabled [ 48.500430][ C0] Rebooting in 86400 seconds..