[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.159058][ T26] audit: type=1800 audit(1567990542.138:25): pid=8568 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.194207][ T26] audit: type=1800 audit(1567990542.138:26): pid=8568 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.215718][ T26] audit: type=1800 audit(1567990542.138:27): pid=8568 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 '10.128.0.22' (ECDSA) to the list of known hosts. syzkaller login: [ 231.610851][ T8722] IPVS: ftp: loaded support on port[0] = 21 [ 231.670701][ T8722] chnl_net:caif_netlink_parms(): no params data found [ 231.699766][ T8722] bridge0: port 1(bridge_slave_0) entered blocking state [ 231.707632][ T8722] bridge0: port 1(bridge_slave_0) entered disabled state [ 231.715693][ T8722] device bridge_slave_0 entered promiscuous mode [ 231.724185][ T8722] bridge0: port 2(bridge_slave_1) entered blocking state [ 231.731337][ T8722] bridge0: port 2(bridge_slave_1) entered disabled state [ 231.739180][ T8722] device bridge_slave_1 entered promiscuous mode [ 231.757511][ T8722] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 231.768137][ T8722] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 231.786708][ T8722] team0: Port device team_slave_0 added [ 231.794282][ T8722] team0: Port device team_slave_1 added [ 231.875965][ T8722] device hsr_slave_0 entered promiscuous mode [ 231.944625][ T8722] device hsr_slave_1 entered promiscuous mode [ 232.021890][ T8722] bridge0: port 2(bridge_slave_1) entered blocking state [ 232.029095][ T8722] bridge0: port 2(bridge_slave_1) entered forwarding state [ 232.037109][ T8722] bridge0: port 1(bridge_slave_0) entered blocking state [ 232.044327][ T8722] bridge0: port 1(bridge_slave_0) entered forwarding state [ 232.080081][ T8722] 8021q: adding VLAN 0 to HW filter on device bond0 [ 232.091095][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 232.101332][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 232.109935][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 232.117831][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 232.129936][ T8722] 8021q: adding VLAN 0 to HW filter on device team0 [ 232.140503][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 232.149123][ T43] bridge0: port 1(bridge_slave_0) entered blocking state [ 232.156233][ T43] bridge0: port 1(bridge_slave_0) entered forwarding state [ 232.175097][ T8726] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 232.184160][ T8726] bridge0: port 2(bridge_slave_1) entered blocking state [ 232.191246][ T8726] bridge0: port 2(bridge_slave_1) entered forwarding state [ 232.200150][ T8726] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 232.210143][ T8727] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 232.220848][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 232.234605][ T8726] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 232.247327][ T8722] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 232.259448][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 232.267505][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program executing program executing program executing program executing program executing program [ 232.288889][ T8722] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 337.593761][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 337.600812][ C0] (detected by 0, t=10502 jiffies, g=7237, q=150) [ 337.607321][ C0] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294970900-4294960397), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 337.620931][ C0] syz-executor241 R running task 28160 8799 8722 0x0000000a [ 337.628832][ C0] Call Trace: [ 337.632110][ C0] [ 337.634967][ C0] sched_show_task.cold+0x2ed/0x34e [ 337.640170][ C0] rcu_sched_clock_irq.cold+0xac8/0xc13 [ 337.645729][ C0] update_process_times+0x32/0x80 [ 337.650749][ C0] tick_sched_handle+0xa2/0x190 [ 337.655595][ C0] tick_sched_timer+0x53/0x140 [ 337.660359][ C0] __hrtimer_run_queues+0x364/0xe40 [ 337.665554][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 337.670838][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 337.676384][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 337.682099][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 337.688164][ C0] hrtimer_interrupt+0x314/0x770 [ 337.693147][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 337.698690][ C0] apic_timer_interrupt+0xf/0x20 [ 337.703612][ C0] [ 337.706552][ C0] RIP: 0010:check_memory_region+0x14/0x1a0 [ 337.712354][ C0] Code: 89 e5 e8 ef 70 92 05 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 34 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 55 <0f> b6 d2 48 39 c7 48 89 e5 41 55 41 54 53 0f 86 07 01 00 00 4c 8d [ 337.731952][ C0] RSP: 0018:ffff888085f6f2d8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 337.740447][ C0] RAX: ffff7fffffffffff RBX: ffff88809824d768 RCX: ffffffff81595c37 [ 337.748420][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88809824d768 [ 337.756403][ C0] RBP: ffff888085f6f2e8 R08: 1ffff11013049aed R09: ffffed1013049aee [ 337.764369][ C0] R10: ffffed1013049aed R11: ffff88809824d76b R12: 0000000000000001 [ 337.772336][ C0] R13: 0000000000000003 R14: ffffed1013049aed R15: 0000000000000001 [ 337.780320][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 337.786653][ C0] ? __kasan_check_read+0x11/0x20 [ 337.791670][ C0] native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 337.797822][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 337.804063][ C0] ? mark_held_locks+0xf0/0xf0 [ 337.808825][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 337.813670][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 337.818618][ C0] ? lock_acquire+0x190/0x410 [ 337.823358][ C0] ? hhf_change+0x2e3/0xad0 [ 337.827865][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 337.832621][ C0] ? hhf_change+0x2e3/0xad0 [ 337.837115][ C0] hhf_change+0x2e3/0xad0 [ 337.841445][ C0] ? hhf_reset+0x40/0x40 [ 337.845686][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 337.851935][ C0] ? nla_strcmp+0xe3/0x120 [ 337.856344][ C0] ? hhf_reset+0x40/0x40 [ 337.860656][ C0] tc_modify_qdisc+0xfcf/0x1c50 [ 337.865515][ C0] ? qdisc_create+0x1210/0x1210 [ 337.870382][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 337.876620][ C0] ? qdisc_create+0x1210/0x1210 [ 337.881671][ C0] rtnetlink_rcv_msg+0x463/0xb00 [ 337.886651][ C0] ? rtnetlink_put_metrics+0x580/0x580 [ 337.892173][ C0] ? netlink_deliver_tap+0x22d/0xbf0 [ 337.897463][ C0] ? find_held_lock+0x35/0x130 [ 337.902234][ C0] netlink_rcv_skb+0x177/0x450 [ 337.906994][ C0] ? rtnetlink_put_metrics+0x580/0x580 [ 337.912452][ C0] ? netlink_ack+0xb30/0xb30 [ 337.917038][ C0] ? __kasan_check_read+0x11/0x20 [ 337.922062][ C0] ? netlink_deliver_tap+0x254/0xbf0 [ 337.927391][ C0] rtnetlink_rcv+0x1d/0x30 [ 337.931830][ C0] netlink_unicast+0x531/0x710 [ 337.936748][ C0] ? netlink_attachskb+0x7c0/0x7c0 [ 337.941880][ C0] ? _copy_from_iter_full+0x25d/0x8a0 [ 337.947268][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 337.952991][ C0] ? __check_object_size+0x3d/0x437 [ 337.958196][ C0] netlink_sendmsg+0x8a5/0xd60 [ 337.962968][ C0] ? netlink_unicast+0x710/0x710 [ 337.967928][ C0] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 337.973522][ C0] ? apparmor_socket_sendmsg+0x2a/0x30 [ 337.978975][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 337.985213][ C0] ? security_socket_sendmsg+0x8d/0xc0 [ 337.990665][ C0] ? netlink_unicast+0x710/0x710 [ 337.995715][ C0] sock_sendmsg+0xd7/0x130 [ 338.000136][ C0] ___sys_sendmsg+0x803/0x920 [ 338.004810][ C0] ? copy_msghdr_from_user+0x440/0x440 [ 338.010267][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 338.016499][ C0] ? tomoyo_path_number_perm+0x263/0x520 [ 338.022134][ C0] ? sock_ioctl+0x489/0x780 [ 338.026632][ C0] ? dlci_ioctl_set+0x40/0x40 [ 338.031330][ C0] ? __do_page_fault+0x56a/0xdd0 [ 338.036270][ C0] ? dlci_ioctl_set+0x40/0x40 [ 338.040941][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 338.047177][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 338.053851][ C0] ? __fget_light+0x1a9/0x230 [ 338.058536][ C0] ? __fdget+0x1b/0x20 [ 338.062595][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 338.068839][ C0] __sys_sendmsg+0x105/0x1d0 [ 338.073426][ C0] ? __sys_sendmsg_sock+0xd0/0xd0 [ 338.078469][ C0] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 338.083921][ C0] ? do_syscall_64+0x26/0x6a0 [ 338.088603][ C0] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 338.094679][ C0] ? do_syscall_64+0x26/0x6a0 [ 338.099379][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 338.104140][ C0] do_syscall_64+0xfd/0x6a0 [ 338.108643][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 338.114526][ C0] RIP: 0033:0x442399 [ 338.118424][ C0] Code: e8 9c 07 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 3b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 338.138023][ C0] RSP: 002b:00007ffcc9c88358 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 338.146428][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442399 [ 338.154392][ C0] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 [ 338.162355][ C0] RBP: 0000000000038c68 R08: 0000000000000000 R09: 0000000000000000 [ 338.170341][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 338.178321][ C0] R13: 00000000004032f0 R14: 0000000000000000 R15: 0000000000000000 [ 338.186443][ C0] rcu: rcu_preempt kthread starved for 10561 jiffies! g7237 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 338.197532][ C0] rcu: RCU grace-period kthread stack dump: [ 338.203418][ C0] rcu_preempt R running task 29440 10 2 0x80004000 [ 338.211408][ C0] Call Trace: [ 338.214761][ C0] __schedule+0x755/0x1580 [ 338.219267][ C0] ? __sched_text_start+0x8/0x8 [ 338.224131][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 338.229934][ C0] ? schedule_timeout+0x47c/0xc50 [ 338.234955][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 338.240282][ C0] schedule+0xd9/0x260 [ 338.244372][ C0] schedule_timeout+0x486/0xc50 [ 338.249256][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 338.255086][ C0] ? usleep_range+0x170/0x170 [ 338.259785][ C0] ? trace_hardirqs_on+0x67/0x240 [ 338.264806][ C0] ? __kasan_check_read+0x11/0x20 [ 338.269833][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 338.275380][ C0] ? swake_up_one+0x60/0x60 [ 338.279884][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 338.284650][ C0] ? rcu_barrier+0x310/0x310 [ 338.289232][ C0] ? trace_hardirqs_on+0x67/0x240 [ 338.294249][ C0] ? __kasan_check_read+0x11/0x20 [ 338.299273][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 338.305507][ C0] ? __kthread_parkme+0x108/0x1c0 [ 338.310523][ C0] ? __kasan_check_read+0x11/0x20 [ 338.315559][ C0] kthread+0x361/0x430 [ 338.319625][ C0] ? rcu_barrier+0x310/0x310 [ 338.324211][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 338.330464][ C0] ret_from_fork+0x24/0x30