[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.451879][ T26] audit: type=1800 audit(1568466045.531:25): pid=8374 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.495945][ T26] audit: type=1800 audit(1568466045.541:26): pid=8374 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.533136][ T26] audit: type=1800 audit(1568466045.541:27): pid=8374 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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 '10.128.10.61' (ECDSA) to the list of known hosts. syzkaller login: [ 398.964338][ T8527] IPVS: ftp: loaded support on port[0] = 21 [ 399.024229][ T8527] chnl_net:caif_netlink_parms(): no params data found [ 399.051202][ T8527] bridge0: port 1(bridge_slave_0) entered blocking state [ 399.058650][ T8527] bridge0: port 1(bridge_slave_0) entered disabled state [ 399.066696][ T8527] device bridge_slave_0 entered promiscuous mode [ 399.074237][ T8527] bridge0: port 2(bridge_slave_1) entered blocking state [ 399.081409][ T8527] bridge0: port 2(bridge_slave_1) entered disabled state [ 399.088981][ T8527] device bridge_slave_1 entered promiscuous mode [ 399.104624][ T8527] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 399.115272][ T8527] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 399.133229][ T8527] team0: Port device team_slave_0 added [ 399.141004][ T8527] team0: Port device team_slave_1 added [ 399.198279][ T8527] device hsr_slave_0 entered promiscuous mode [ 399.256222][ T8527] device hsr_slave_1 entered promiscuous mode [ 399.303062][ T8527] bridge0: port 2(bridge_slave_1) entered blocking state [ 399.310188][ T8527] bridge0: port 2(bridge_slave_1) entered forwarding state [ 399.317897][ T8527] bridge0: port 1(bridge_slave_0) entered blocking state [ 399.324926][ T8527] bridge0: port 1(bridge_slave_0) entered forwarding state [ 399.355227][ T8527] 8021q: adding VLAN 0 to HW filter on device bond0 [ 399.367381][ T8531] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 399.387104][ T8531] bridge0: port 1(bridge_slave_0) entered disabled state [ 399.394843][ T8531] bridge0: port 2(bridge_slave_1) entered disabled state [ 399.403177][ T8531] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 399.414702][ T8527] 8021q: adding VLAN 0 to HW filter on device team0 [ 399.424659][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 399.433136][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 399.440184][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 399.450536][ T8531] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 399.459424][ T8531] bridge0: port 2(bridge_slave_1) entered blocking state [ 399.466488][ T8531] bridge0: port 2(bridge_slave_1) entered forwarding state [ 399.482332][ T8530] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 399.490981][ T8530] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 399.501474][ T8531] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 399.515383][ T8527] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 399.527636][ T8527] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 399.539578][ T8530] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 399.547996][ T8530] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 399.556300][ T8530] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 399.572018][ T8527] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 504.615829][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 504.622569][ C1] rcu: 1-...!: (10499 ticks this GP) idle=1de/1/0x4000000000000002 softirq=9172/9172 fqs=0 [ 504.632848][ C1] (t=10501 jiffies g=6869 q=74) [ 504.637775][ C1] rcu: rcu_preempt kthread starved for 10502 jiffies! g6869 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 504.649035][ C1] rcu: RCU grace-period kthread stack dump: [ 504.654909][ C1] rcu_preempt I29440 10 2 0x80004000 [ 504.661241][ C1] Call Trace: [ 504.664601][ C1] __schedule+0x755/0x1580 [ 504.669018][ C1] ? __sched_text_start+0x8/0x8 [ 504.673856][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 504.679650][ C1] ? schedule_timeout+0x47c/0xc50 [ 504.684663][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 504.689945][ C1] schedule+0xd9/0x260 [ 504.694008][ C1] schedule_timeout+0x486/0xc50 [ 504.698845][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 504.704642][ C1] ? usleep_range+0x170/0x170 [ 504.709310][ C1] ? trace_hardirqs_on+0x67/0x240 [ 504.714327][ C1] ? __kasan_check_read+0x11/0x20 [ 504.719348][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 504.724886][ C1] ? swake_up_one+0x60/0x60 [ 504.729395][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 504.734154][ C1] ? rcu_barrier+0x310/0x310 [ 504.738736][ C1] ? trace_hardirqs_on+0x67/0x240 [ 504.743747][ C1] ? __kasan_check_read+0x11/0x20 [ 504.748765][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 504.754996][ C1] ? __kthread_parkme+0x108/0x1c0 [ 504.760006][ C1] ? __kasan_check_read+0x11/0x20 [ 504.765021][ C1] kthread+0x361/0x430 [ 504.769078][ C1] ? rcu_barrier+0x310/0x310 [ 504.773658][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 504.779887][ C1] ret_from_fork+0x24/0x30 [ 504.784346][ C1] NMI backtrace for cpu 1 [ 504.788667][ C1] CPU: 1 PID: 8531 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0 [ 504.796228][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 504.806344][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 504.812305][ C1] Call Trace: [ 504.815575][ C1] [ 504.818445][ C1] dump_stack+0x172/0x1f0 [ 504.822769][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 504.827955][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 504.834186][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 504.839807][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 504.845779][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 504.851661][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 504.856767][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 504.862304][ C1] ? raise_softirq+0x138/0x340 [ 504.867068][ C1] update_process_times+0x32/0x80 [ 504.872082][ C1] tick_sched_handle+0xa2/0x190 [ 504.876937][ C1] tick_sched_timer+0x53/0x140 [ 504.881693][ C1] __hrtimer_run_queues+0x364/0xe40 [ 504.886883][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 504.892165][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 504.897698][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 504.903408][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 504.909473][ C1] hrtimer_interrupt+0x314/0x770 [ 504.914445][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 504.919983][ C1] apic_timer_interrupt+0xf/0x20 [ 504.924909][ C1] [ 504.927839][ C1] RIP: 0010:__kasan_check_read+0x1/0x20 [ 504.933376][ C1] Code: 79 99 af ff 0f 0b 4c 8b 4d d0 e9 27 ee ff ff 48 8b 73 58 89 c2 48 c7 c7 08 a8 a9 88 f7 da e8 5a 99 af ff e9 da ee ff ff 90 55 <89> f6 31 d2 48 89 e5 48 8b 4d 08 e8 cf 26 00 00 5d c3 0f 1f 00 66 [ 504.952965][ C1] RSP: 0018:ffff88809304ecb0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 504.961364][ C1] RAX: 0000000000000000 RBX: ffff888094c7eea8 RCX: ffffffff81595c37 [ 504.969325][ C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888094c7eea8 [ 504.977283][ C1] RBP: ffff88809304ed80 R08: 1ffff1101298fdd5 R09: ffffed101298fdd6 [ 504.985244][ C1] R10: ffffed101298fdd5 R11: ffff888094c7eeab R12: 0000000000000001 [ 504.993210][ C1] R13: 0000000000000003 R14: ffffed101298fdd5 R15: 0000000000000001 [ 505.001188][ C1] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 505.007514][ C1] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 505.013834][ C1] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 505.020066][ C1] ? mark_held_locks+0xf0/0xf0 [ 505.024833][ C1] ? mark_held_locks+0xf0/0xf0 [ 505.029588][ C1] do_raw_spin_lock+0x20e/0x2e0 [ 505.034431][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 505.039353][ C1] ? lock_acquire+0x190/0x410 [ 505.044067][ C1] ? __dev_queue_xmit+0x14b8/0x3650 [ 505.049262][ C1] _raw_spin_lock+0x37/0x40 [ 505.053763][ C1] ? __dev_queue_xmit+0x14b8/0x3650 [ 505.058950][ C1] __dev_queue_xmit+0x14b8/0x3650 [ 505.063982][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 505.069369][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 505.074652][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 505.080952][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 505.086281][ C1] ? br_forward_finish+0x235/0x400 [ 505.091389][ C1] ? find_held_lock+0x35/0x130 [ 505.096147][ C1] ? br_forward_finish+0x235/0x400 [ 505.101260][ C1] dev_queue_xmit+0x18/0x20 [ 505.105755][ C1] ? dev_queue_xmit+0x18/0x20 [ 505.110429][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 505.115805][ C1] ? __kasan_check_read+0x11/0x20 [ 505.120824][ C1] br_forward_finish+0xfa/0x400 [ 505.125669][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 505.131208][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 505.135966][ C1] ? __kasan_check_read+0x11/0x20 [ 505.140987][ C1] __br_forward+0x641/0xb00 [ 505.145486][ C1] ? br_forward_finish+0x400/0x400 [ 505.150593][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 505.156137][ C1] deliver_clone+0x61/0xc0 [ 505.160545][ C1] maybe_deliver+0x2c7/0x390 [ 505.165129][ C1] br_flood+0x13a/0x3d0 [ 505.169288][ C1] br_dev_xmit+0x98c/0x15a0 [ 505.173790][ C1] ? br_poll_controller+0x10/0x10 [ 505.178801][ C1] ? netif_skb_features+0x6c2/0xb90 [ 505.183998][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 505.190230][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 505.195349][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 505.200362][ C1] ? __kasan_check_read+0x11/0x20 [ 505.205378][ C1] ? __lock_acquire+0x1702/0x4c30 [ 505.210412][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 505.215687][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 505.221055][ C1] ? __kasan_check_read+0x11/0x20 [ 505.226069][ C1] ? mark_lock+0xc0/0x11e0 [ 505.230503][ C1] ? mark_held_locks+0xa4/0xf0 [ 505.235284][ C1] dev_queue_xmit+0x18/0x20 [ 505.239782][ C1] ? dev_queue_xmit+0x18/0x20 [ 505.244499][ C1] neigh_resolve_output+0x5a5/0x970 [ 505.249701][ C1] ip6_finish_output2+0x1034/0x2520 [ 505.254891][ C1] ? ip6_mtu+0x2e6/0x460 [ 505.259134][ C1] ? ip6_forward_finish+0x530/0x530 [ 505.264326][ C1] ? lock_downgrade+0x920/0x920 [ 505.269173][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 505.275417][ C1] ? __kasan_check_read+0x11/0x20 [ 505.280437][ C1] __ip6_finish_output+0x444/0xa50 [ 505.285540][ C1] ? __ip6_finish_output+0x444/0xa50 [ 505.290820][ C1] ip6_finish_output+0x38/0x1f0 [ 505.295688][ C1] ip6_output+0x235/0x7c0 [ 505.300033][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 505.305149][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 505.310484][ C1] ndisc_send_skb+0xf29/0x1450 [ 505.315261][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 505.320577][ C1] ? skb_set_owner_w+0x21b/0x320 [ 505.325521][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 505.331259][ C1] ndisc_send_ns+0x3a9/0x850 [ 505.335849][ C1] ? mark_held_locks+0xa4/0xf0 [ 505.340608][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 505.345795][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 505.351071][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 505.356259][ C1] ? trace_hardirqs_on+0x67/0x240 [ 505.361279][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 505.366474][ C1] addrconf_dad_work+0xb88/0x1150 [ 505.371496][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 505.377065][ C1] process_one_work+0x9af/0x1740 [ 505.382013][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 505.387380][ C1] ? lock_acquire+0x190/0x410 [ 505.392064][ C1] worker_thread+0x98/0xe40 [ 505.396559][ C1] ? trace_hardirqs_on+0x67/0x240 [ 505.401590][ C1] kthread+0x361/0x430 [ 505.405651][ C1] ? process_one_work+0x1740/0x1740 [ 505.410842][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 505.417078][ C1] ret_from_fork+0x24/0x30