[ 36.671270] audit: type=1800 audit(1576799214.357:28): pid=6897 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 37.071660] audit: type=1800 audit(1576799214.757:29): pid=6897 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.094414] audit: type=1800 audit(1576799214.787:30): pid=6897 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 48.501187] IPVS: Creating netns size=2712 id=1 [ 48.506292] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.193' (ECDSA) to the list of known hosts. 2019/12/19 23:47:13 parsed 1 programs 2019/12/19 23:47:13 executed programs: 0 [ 56.304268] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 56.316105] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 56.324286] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 56.332367] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 56.340157] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 56.348697] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 56.367432] IPVS: Creating netns size=2712 id=2 [ 56.372246] IPVS: ftp: loaded support on port[0] = 21 [ 56.445225] IPVS: Creating netns size=2712 id=3 [ 56.450303] IPVS: ftp: loaded support on port[0] = 21 [ 56.600743] chnl_net:caif_netlink_parms(): no params data found [ 56.609129] IPVS: Creating netns size=2712 id=4 [ 56.614171] IPVS: ftp: loaded support on port[0] = 21 [ 56.841397] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.848068] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.857112] device bridge_slave_0 entered promiscuous mode [ 56.873489] chnl_net:caif_netlink_parms(): no params data found [ 56.887628] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.894071] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.903542] device bridge_slave_1 entered promiscuous mode [ 56.921558] IPVS: Creating netns size=2712 id=5 [ 56.927964] IPVS: ftp: loaded support on port[0] = 21 [ 56.991903] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.040072] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.182236] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.189184] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.199485] device bridge_slave_0 entered promiscuous mode [ 57.257524] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.264199] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.273605] device bridge_slave_1 entered promiscuous mode [ 57.286380] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.345482] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.386263] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.404073] IPVS: Creating netns size=2712 id=6 [ 57.408914] IPVS: ftp: loaded support on port[0] = 21 [ 57.443009] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.451135] chnl_net:caif_netlink_parms(): no params data found [ 57.506059] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.576661] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.723759] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.766716] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.774466] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.780837] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.790167] device bridge_slave_0 entered promiscuous mode [ 57.810388] IPVS: Creating netns size=2712 id=7 [ 57.822122] IPVS: ftp: loaded support on port[0] = 21 [ 57.856662] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.863475] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.872997] device bridge_slave_1 entered promiscuous mode [ 57.886291] chnl_net:caif_netlink_parms(): no params data found [ 58.016526] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.037787] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.061550] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.070301] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.086220] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.309669] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.316336] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.326034] device bridge_slave_0 entered promiscuous mode [ 58.345700] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.363902] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.370337] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.379504] device bridge_slave_1 entered promiscuous mode [ 58.397276] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.431206] chnl_net:caif_netlink_parms(): no params data found [ 58.516660] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.540954] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.551192] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.578152] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.650139] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.817391] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.823951] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.833474] device bridge_slave_0 entered promiscuous mode [ 58.854112] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.872315] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.878764] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.896503] device bridge_slave_1 entered promiscuous mode [ 58.905011] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.958231] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.029949] chnl_net:caif_netlink_parms(): no params data found [ 59.059281] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.096751] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.111849] 8021q: adding VLAN 0 to HW filter on device bond0 [ 59.124418] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.134778] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.187703] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 59.245015] 8021q: adding VLAN 0 to HW filter on device bond0 [ 59.256911] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.294320] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 59.302996] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.390600] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.397694] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.407836] device bridge_slave_0 entered promiscuous mode [ 59.427044] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 59.436546] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 59.443645] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.451130] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.463639] device bridge_slave_1 entered promiscuous mode [ 59.495736] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.544556] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 59.553883] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.560257] bridge0: port 1(bridge_slave_0) entered forwarding state [ 59.569292] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 59.577441] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.626748] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 59.648968] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.671353] 8021q: adding VLAN 0 to HW filter on device bond0 [ 59.684337] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.693820] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 59.701564] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.707967] bridge0: port 2(bridge_slave_1) entered forwarding state [ 59.749501] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 59.797640] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 59.805893] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 59.818591] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.825029] bridge0: port 1(bridge_slave_0) entered forwarding state [ 59.848034] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 59.857363] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 59.866450] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 59.879607] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 59.887860] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.915180] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 59.929498] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.935936] bridge0: port 2(bridge_slave_1) entered forwarding state [ 59.943044] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 59.950756] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 59.960125] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 60.030700] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 60.089484] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 60.097534] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 60.105838] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.112248] bridge0: port 1(bridge_slave_0) entered forwarding state [ 60.119275] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 60.173225] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 60.181315] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.187728] bridge0: port 2(bridge_slave_1) entered forwarding state [ 60.195922] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 60.221546] 8021q: adding VLAN 0 to HW filter on device bond0 [ 60.250054] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 60.259098] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 60.272879] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 60.288238] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 60.297905] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 60.326943] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 60.339916] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 60.351374] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 60.414748] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 60.452929] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 60.466560] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 60.498200] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 60.508964] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.515417] bridge0: port 1(bridge_slave_0) entered forwarding state [ 60.553850] 8021q: adding VLAN 0 to HW filter on device bond0 [ 60.560863] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 60.573667] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 60.581736] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.588423] bridge0: port 2(bridge_slave_1) entered forwarding state [ 60.614075] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 60.654491] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 60.697341] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 60.732632] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 60.762817] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 60.803459] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 61.247633] 8021q: adding VLAN 0 to HW filter on device bond0 [ 61.334070] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 61.369339] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.601980] sched: RT throttling activated 2019/12/19 23:47:20 executed programs: 6 [ 70.341994] hrtimer: interrupt took 44605 ns [ 167.841958] INFO: rcu_sched detected stalls on CPUs/tasks: [ 167.847880] (detected by 1, t=10502 jiffies, g=-114, c=-115, q=1) [ 167.854315] All QSes seen, last rcu_sched kthread activity 10500 (4294953928-4294943428), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 167.866354] syz-executor.0 R running task 28928 7398 7145 0x00000000 [ 167.873804] 0000000000001be9 ffff88012c107ca8 ffffffff813d414c ffffffff81615a00 [ 167.881855] 0000000041b58ab3 ffffffff868f20bf ffffffff813d3ec0 ffff88012c107c68 [ 167.889911] ffffffff81491fd4 0000000000000000 ffffffff87651000 0000000000000002 [ 167.897956] Call Trace: [ 167.900521] [] sched_show_task+0x28c/0x400 [ 167.907132] [] ? power_down+0xbf/0xbf [ 167.912569] [] ? SyS_sched_rr_get_interval+0x2b0/0x2b0 [ 167.919563] [] ? rcu_check_callbacks+0x1814/0x2010 [ 167.926125] [] rcu_check_callbacks+0x1c5c/0x2010 [ 167.932519] [] ? tick_sched_do_timer+0x80/0x80 [ 167.938740] [] update_process_times+0x34/0x60 [ 167.944866] [] tick_sched_handle.isra.19+0x44/0xe0 [ 167.951435] [] tick_sched_timer+0x64/0xd0 [ 167.957216] [] __hrtimer_run_queues+0x2d4/0xbf0 [ 167.963526] [] ? enqueue_hrtimer+0x380/0x380 [ 167.969565] [] ? ktime_get_update_offsets_now+0x139/0x350 [ 167.976734] [] ? hrtimer_interrupt+0x20d/0x470 [ 167.982960] [] hrtimer_interrupt+0x19d/0x470 [ 167.989007] [] local_apic_timer_interrupt+0x6e/0xf0 [ 167.995668] [] smp_apic_timer_interrupt+0x76/0xa0 [ 168.002141] [] apic_timer_interrupt+0x8c/0xa0 [ 168.008263] [] ? _raw_spin_unlock_irq+0x56/0x80 [ 168.015321] [] get_signal+0xe61/0x13a0 [ 168.020855] [] do_signal+0x7f/0x1cd0 [ 168.026210] [] ? is_prefetch.isra.27+0x300/0x300 [ 168.032601] [] ? setup_sigcontext+0x7d0/0x7d0 [ 168.038736] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 168.045488] [] ? exit_to_usermode_loop+0x38/0x1c0 [ 168.051963] [] exit_to_usermode_loop+0x16b/0x1c0 [ 168.058360] [] prepare_exit_to_usermode+0x117/0x140 [ 168.065023] [] retint_user+0x8/0x20 [ 168.070289] rcu_sched kthread starved for 10500 jiffies! g18446744073709551502 c18446744073709551501 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 [ 168.082765] rcu_sched R running task 29392 8 2 0x00000000 [ 168.090208] ffff88012b0afac8 ffff88012c020400 ffff88012c020d90 ffff88012c020d68 [ 168.098265] ffff88012c020418 ffff88012b09a1c8 1ffff10000000000 ffff8800bbb56380 [ 168.106298] ffff88012b09a1c0 ffff88012b0a8000 ffffed0025615001 ffff88012b0a8008 [ 168.114355] Call Trace: [ 168.116927] [] schedule+0x9a/0x1c0 [ 168.122098] [] schedule_timeout+0x2e5/0x670 [ 168.128051] [] ? usleep_range+0x130/0x130 [ 168.133831] [] ? prepare_to_swait+0x11e/0x220 [ 168.139956] [] ? swake_up_all+0x370/0x370 [ 168.145739] [] ? init_timer_on_stack_key+0xe0/0xe0 [ 168.152299] [] ? prepare_to_swait_event+0x6c/0xf0 [ 168.158773] [] rcu_gp_kthread+0xee2/0x1f70 [ 168.164638] [] ? pick_next_task_fair+0xa8e/0x1400 [ 168.171113] [] ? force_qs_rnp+0x400/0x400 [ 168.176910] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 168.183745] [] ? _raw_spin_unlock_irq+0x60/0x80 [ 168.190073] [] ? __schedule+0x1206/0x1c00 [ 168.195871] [] ? force_qs_rnp+0x400/0x400 [ 168.201657] [] kthread+0x209/0x2d0 [ 168.206831] [] ? kthread_create_on_node+0x390/0x390 [ 168.213482] [] ret_from_fork+0x22/0x50 [ 168.219004] [] ? kthread_create_on_node+0x390/0x390 [ 168.225685] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 168.231597] (detected by 1, t=10538 jiffies, g=1847, c=1846, q=24) [ 168.238118] All QSes seen, last rcu_preempt kthread activity 10538 (4294953966-4294943428), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 168.250406] syz-executor.0 R running task 28928 7398 7145 0x00000000 [ 168.257871] 0000000000001be9 ffff88012c107ca8 ffffffff813d414c ffffffff81615a00 [ 168.265917] 0000000041b58ab3 ffffffff868f20bf ffffffff813d3ec0 ffff88012c107c68 [ 168.273972] ffffffff81491fd4 0000000000000000 ffffffff87651000 0000000000000002 [ 168.282016] Call Trace: [ 168.284582] [] sched_show_task+0x28c/0x400 [ 168.291191] [] ? power_down+0xbf/0xbf [ 168.296624] [] ? SyS_sched_rr_get_interval+0x2b0/0x2b0 [ 168.303532] [] ? rcu_check_callbacks+0x1814/0x2010 [ 168.310094] [] rcu_check_callbacks+0x1c5c/0x2010 [ 168.316482] [] ? tick_sched_do_timer+0x80/0x80 [ 168.322712] [] update_process_times+0x34/0x60 [ 168.328850] [] tick_sched_handle.isra.19+0x44/0xe0 [ 168.335417] [] tick_sched_timer+0x64/0xd0 [ 168.341215] [] __hrtimer_run_queues+0x2d4/0xbf0 [ 168.347519] [] ? enqueue_hrtimer+0x380/0x380 [ 168.353571] [] ? ktime_get_update_offsets_now+0x139/0x350 [ 168.360742] [] ? hrtimer_interrupt+0x20d/0x470 [ 168.366957] [] hrtimer_interrupt+0x19d/0x470 [ 168.373015] [] local_apic_timer_interrupt+0x6e/0xf0 [ 168.379679] [] smp_apic_timer_interrupt+0x76/0xa0 [ 168.386154] [] apic_timer_interrupt+0x8c/0xa0 [ 168.392278] [] ? _raw_spin_unlock_irq+0x56/0x80 [ 168.399322] [] get_signal+0xe61/0x13a0 [ 168.404843] [] do_signal+0x7f/0x1cd0 [ 168.410188] [] ? is_prefetch.isra.27+0x300/0x300 [ 168.416575] [] ? setup_sigcontext+0x7d0/0x7d0 [ 168.422704] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 168.429565] [] ? exit_to_usermode_loop+0x38/0x1c0 [ 168.436045] [] exit_to_usermode_loop+0x16b/0x1c0 [ 168.442451] [] prepare_exit_to_usermode+0x117/0x140 [ 168.449104] [] retint_user+0x8/0x20 [ 168.454374] rcu_preempt kthread starved for 10538 jiffies! g1847 c1846 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 [ 168.464145] rcu_preempt R running task 29392 7 2 0x00000000 [ 168.471597] ffff88012b0a7ac8 ffff88012c020400 ffff88012c020d90 ffff88012c020d68 [ 168.479654] ffff88012c020418 ffff88012b098188 1ffff10000000000 ffff8800afb22280 [ 168.487700] ffff88012b098180 ffff88012b0a0000 ffffed0025614001 ffff88012b0a0008 [ 168.495752] Call Trace: [ 168.498320] [] schedule+0x9a/0x1c0 [ 168.503492] [] schedule_timeout+0x2e5/0x670 [ 168.509446] [] ? usleep_range+0x130/0x130 [ 168.515231] [] ? prepare_to_swait+0x11e/0x220 [ 168.521359] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 168.528096] [] ? swake_up_all+0x370/0x370 [ 168.533878] [] ? init_timer_on_stack_key+0xe0/0xe0 [ 168.540442] [] ? prepare_to_swait_event+0x6c/0xf0 [ 168.546919] [] rcu_gp_kthread+0xee2/0x1f70 [ 168.552784] [] ? pick_next_task_fair+0xa8e/0x1400 [ 168.559277] [] ? force_qs_rnp+0x400/0x400 [ 168.565063] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 168.571886] [] ? _raw_spin_unlock_irq+0x60/0x80 [ 168.578184] [] ? __schedule+0x1206/0x1c00 [ 168.583979] [] ? force_qs_rnp+0x400/0x400 [ 168.589773] [] kthread+0x209/0x2d0 [ 168.594954] [] ? kthread_create_on_node+0x390/0x390 [ 168.601626] [] ret_from_fork+0x22/0x50 [ 168.607162] [] ? kthread_create_on_node+0x390/0x390