[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.950084][ T26] audit: type=1800 audit(1568517971.318:25): pid=8632 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.988578][ T26] audit: type=1800 audit(1568517971.318:26): pid=8632 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.029013][ T26] audit: type=1800 audit(1568517971.318:27): pid=8632 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 '10.128.0.162' (ECDSA) to the list of known hosts. syzkaller login: [ 264.133788][ T8786] IPVS: ftp: loaded support on port[0] = 21 [ 264.188788][ T8786] chnl_net:caif_netlink_parms(): no params data found [ 264.216007][ T8786] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.224171][ T8786] bridge0: port 1(bridge_slave_0) entered disabled state [ 264.232633][ T8786] device bridge_slave_0 entered promiscuous mode [ 264.241136][ T8786] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.248347][ T8786] bridge0: port 2(bridge_slave_1) entered disabled state [ 264.257582][ T8786] device bridge_slave_1 entered promiscuous mode [ 264.274432][ T8786] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 264.285478][ T8786] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 264.304843][ T8786] team0: Port device team_slave_0 added [ 264.312359][ T8786] team0: Port device team_slave_1 added [ 264.388996][ T8786] device hsr_slave_0 entered promiscuous mode [ 264.457169][ T8786] device hsr_slave_1 entered promiscuous mode [ 264.505368][ T8786] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.512914][ T8786] bridge0: port 2(bridge_slave_1) entered forwarding state [ 264.520802][ T8786] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.528077][ T8786] bridge0: port 1(bridge_slave_0) entered forwarding state [ 264.561178][ T8786] 8021q: adding VLAN 0 to HW filter on device bond0 [ 264.574162][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 264.594910][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 264.604013][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 264.613265][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 264.625251][ T8786] 8021q: adding VLAN 0 to HW filter on device team0 [ 264.637162][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 264.645596][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.652812][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 264.663882][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 264.673505][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.680788][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 264.697626][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 264.706733][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 264.718068][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 264.732636][ T8786] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 264.745441][ T8786] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 264.758731][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 264.768544][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 264.777200][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 264.793475][ T8786] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 369.826474][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 369.833357][ C0] rcu: 0-...!: (1 GPs behind) idle=c66/1/0x4000000000000002 softirq=9245/9246 fqs=200 [ 369.843557][ C0] (t=10500 jiffies g=7385 q=168) [ 369.848572][ C0] rcu: rcu_preempt kthread starved for 10099 jiffies! g7385 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 369.859924][ C0] rcu: RCU grace-period kthread stack dump: [ 369.865971][ C0] rcu_preempt I29520 10 2 0x80004000 [ 369.872286][ C0] Call Trace: [ 369.875655][ C0] __schedule+0x755/0x1580 [ 369.880074][ C0] ? __sched_text_start+0x8/0x8 [ 369.884918][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 369.890794][ C0] ? schedule_timeout+0x47c/0xc50 [ 369.895809][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 369.901082][ C0] schedule+0xd9/0x260 [ 369.905326][ C0] schedule_timeout+0x486/0xc50 [ 369.910249][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 369.916042][ C0] ? usleep_range+0x170/0x170 [ 369.920705][ C0] ? trace_hardirqs_on+0x67/0x240 [ 369.925749][ C0] ? __kasan_check_read+0x11/0x20 [ 369.930778][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 369.936316][ C0] ? swake_up_one+0x60/0x60 [ 369.940852][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 369.945785][ C0] ? rcu_barrier+0x310/0x310 [ 369.950371][ C0] ? trace_hardirqs_on+0x67/0x240 [ 369.955391][ C0] ? __kasan_check_read+0x11/0x20 [ 369.960496][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 369.966719][ C0] ? __kthread_parkme+0x108/0x1c0 [ 369.971733][ C0] ? __kasan_check_read+0x11/0x20 [ 369.976741][ C0] kthread+0x361/0x430 [ 369.980801][ C0] ? rcu_barrier+0x310/0x310 [ 369.985383][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 369.991609][ C0] ret_from_fork+0x24/0x30 [ 369.996058][ C0] NMI backtrace for cpu 0 [ 370.000377][ C0] CPU: 0 PID: 8786 Comm: syz-executor242 Not tainted 5.3.0-rc7+ #0 [ 370.008311][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 370.018521][ C0] Call Trace: [ 370.021788][ C0] [ 370.024748][ C0] dump_stack+0x172/0x1f0 [ 370.029078][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 370.034271][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.040500][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 370.046127][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 370.052454][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 370.058369][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 370.063558][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 370.069089][ C0] ? raise_softirq+0x138/0x340 [ 370.073857][ C0] update_process_times+0x32/0x80 [ 370.078868][ C0] tick_sched_handle+0xa2/0x190 [ 370.083892][ C0] tick_sched_timer+0x53/0x140 [ 370.088660][ C0] __hrtimer_run_queues+0x364/0xe40 [ 370.093859][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 370.099220][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 370.104749][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 370.110450][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 370.116684][ C0] hrtimer_interrupt+0x314/0x770 [ 370.121712][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 370.127246][ C0] apic_timer_interrupt+0xf/0x20 [ 370.132161][ C0] [ 370.135139][ C0] RIP: 0010:hhf_dequeue+0x630/0xa20 [ 370.140326][ C0] Code: 49 8d 7f 08 4c 8b 73 08 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 ac 03 00 00 4c 89 f2 4d 89 77 08 48 c1 ea 03 42 80 3c 22 00 <0f> 85 89 03 00 00 4d 89 3e e8 b2 90 aa fb 4d 8d b5 98 03 00 00 4c [ 370.160609][ C0] RSP: 0018:ffff888091557348 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 370.169011][ C0] RAX: 1ffff11013230bbf RBX: ffff888099185df8 RCX: ffffffff85c7e431 [ 370.177084][ C0] RDX: 1ffff11013230bd2 RSI: ffffffff85c7e43b RDI: ffff888099185e98 [ 370.185043][ C0] RBP: ffff888091557398 R08: ffff88809330c140 R09: fffffbfff14e9755 [ 370.193001][ C0] R10: ffff88809330ca48 R11: ffff88809330c140 R12: dffffc0000000000 [ 370.200975][ C0] R13: ffff888099185b00 R14: ffff888099185e90 R15: ffff888099185e90 [ 370.208962][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 370.213542][ C0] ? hhf_dequeue+0x5db/0xa20 [ 370.218141][ C0] ? hhf_dequeue+0x5db/0xa20 [ 370.224639][ C0] __qdisc_run+0x1e7/0x19d0 [ 370.229267][ C0] ? dev_queue_xmit+0x18/0x20 [ 370.233947][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 370.238974][ C0] ? __kasan_check_read+0x11/0x20 [ 370.244857][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 370.251105][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 370.256443][ C0] ? __copy_skb_header+0x2e8/0x550 [ 370.261657][ C0] ? __skb_checksum_complete+0x3f0/0x3f0 [ 370.267364][ C0] ? rcu_read_lock_sched_held+0x110/0x130 [ 370.273309][ C0] ? __kasan_check_write+0x14/0x20 [ 370.278416][ C0] ? __skb_clone+0x5c8/0x820 [ 370.283007][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.289237][ C0] dev_queue_xmit+0x18/0x20 [ 370.293834][ C0] ? dev_queue_xmit+0x18/0x20 [ 370.298598][ C0] netlink_deliver_tap+0x8e2/0xbf0 [ 370.303704][ C0] __netlink_sendskb+0x62/0xc0 [ 370.308463][ C0] netlink_unicast+0x60a/0x710 [ 370.313236][ C0] ? netlink_attachskb+0x7c0/0x7c0 [ 370.318346][ C0] netlink_ack+0x63f/0xb30 [ 370.322779][ C0] ? netlink_sendmsg+0xd60/0xd60 [ 370.327722][ C0] ? find_held_lock+0x35/0x130 [ 370.332662][ C0] netlink_rcv_skb+0x376/0x450 [ 370.337511][ C0] ? rtnetlink_put_metrics+0x580/0x580 [ 370.343068][ C0] ? netlink_ack+0xb30/0xb30 [ 370.347746][ C0] ? __kasan_check_read+0x11/0x20 [ 370.352853][ C0] ? netlink_deliver_tap+0x254/0xbf0 [ 370.358134][ C0] rtnetlink_rcv+0x1d/0x30 [ 370.362548][ C0] netlink_unicast+0x531/0x710 [ 370.367300][ C0] ? netlink_attachskb+0x7c0/0x7c0 [ 370.372558][ C0] ? _copy_from_iter_full+0x25d/0x8a0 [ 370.377927][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 370.383637][ C0] ? __check_object_size+0x3d/0x437 [ 370.388935][ C0] netlink_sendmsg+0x8a5/0xd60 [ 370.393695][ C0] ? netlink_unicast+0x710/0x710 [ 370.398640][ C0] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 370.404178][ C0] ? apparmor_socket_sendmsg+0x2a/0x30 [ 370.409627][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.415878][ C0] ? security_socket_sendmsg+0x8d/0xc0 [ 370.421329][ C0] ? netlink_unicast+0x710/0x710 [ 370.426308][ C0] sock_sendmsg+0xd7/0x130 [ 370.430722][ C0] ___sys_sendmsg+0x803/0x920 [ 370.435387][ C0] ? copy_msghdr_from_user+0x440/0x440 [ 370.440833][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 370.447061][ C0] ? tomoyo_path_number_perm+0x263/0x520 [ 370.452714][ C0] ? sock_ioctl+0x489/0x780 [ 370.457290][ C0] ? dlci_ioctl_set+0x40/0x40 [ 370.461965][ C0] ? __do_page_fault+0x56a/0xdd0 [ 370.466894][ C0] ? dlci_ioctl_set+0x40/0x40 [ 370.471567][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.477793][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.484018][ C0] ? __fget_light+0x1a9/0x230 [ 370.488772][ C0] ? __fdget+0x1b/0x20 [ 370.492832][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 370.499063][ C0] __sys_sendmsg+0x105/0x1d0 [ 370.503647][ C0] ? __sys_sendmsg_sock+0xd0/0xd0 [ 370.508676][ C0] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 370.514135][ C0] ? do_syscall_64+0x26/0x6a0 [ 370.518898][ C0] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 370.525059][ C0] ? do_syscall_64+0x26/0x6a0 [ 370.529727][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 370.534487][ C0] do_syscall_64+0xfd/0x6a0 [ 370.538985][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 370.544867][ C0] RIP: 0033:0x441b19 [ 370.548757][ C0] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 370.568788][ C0] RSP: 002b:00007ffdbed1b898 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 370.577270][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441b19 [ 370.585223][ C0] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 [ 370.593180][ C0] RBP: 00007ffdbed1b8b0 R08: 0000000001bbbbbb R09: 0000000001bbbbbb [ 370.601135][ C0] R10: 0000000001bbbbbb R11: 0000000000000246 R12: 0000000000000000 [ 370.609102][ C0] R13: 00000000004030b0 R14: 0000000000000000 R15: 0000000000000000