[ 548.365394][ T2023] Test #1 from CPU1: netcons_DMMtK [ 550.190618][ T2045] Test #2 from CPU1: netcons_DMMtK [ 552.246376][ T2069] Test #3 from CPU0: netcons_DMMtK [ 558.938179][ T178] sched: DL replenish lagged too much [ 558.938646][ C2] [ 558.938651][ C2] ======================================================== [ 558.938654][ C2] WARNING: possible irq lock inversion dependency detected [ 558.938658][ C2] 6.17.0-rc1-virtme #1 Not tainted [ 558.938660][ C2] -------------------------------------------------------- [ 558.938661][ C2] kworker/u19:1/178 just changed the state of lock: [ 558.938663][ C2] ffffffffacc77e60 (console_owner){-...}-{0:0}, at: console_lock_spinning_enable+0x7d/0xb0 [ 558.938684][ C2] but this lock took another, HARDIRQ-unsafe lock in the past: [ 558.938686][ C2] (_xmit_ETHER#2){+.-.}-{3:3} [ 558.938689][ C2] [ 558.938689][ C2] [ 558.938689][ C2] and interrupts could create inverse lock ordering between them. [ 558.938689][ C2] [ 558.938690][ C2] [ 558.938690][ C2] other info that might help us debug this: [ 558.938693][ C2] Chain exists of: [ 558.938693][ C2] console_owner --> target_list_lock --> _xmit_ETHER#2 [ 558.938693][ C2] [ 558.938698][ C2] Possible interrupt unsafe locking scenario: [ 558.938698][ C2] [ 558.938699][ C2] CPU0 CPU1 [ 558.938700][ C2] ---- ---- [ 558.938701][ C2] lock(_xmit_ETHER#2); [ 558.938703][ C2] local_irq_disable(); [ 558.938705][ C2] lock(console_owner); [ 558.938707][ C2] lock(target_list_lock); [ 558.938708][ C2] [ 558.938709][ C2] lock(console_owner); [ 558.938711][ C2] [ 558.938711][ C2] *** DEADLOCK *** [ 558.938711][ C2] [ 558.938712][ C2] 7 locks held by kworker/u19:1/178: [ 558.938714][ C2] #0: ffff8880010d1d48 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7e5/0x1650 [ 558.938724][ C2] #1: ffffc90000787d40 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0xded/0x1650 [ 558.938730][ C2] #2: ffff888005fa00b8 (&buf->lock){+.+.}-{4:4}, at: flush_to_ldisc+0x36/0x700 [ 558.938744][ C2] #3: ffff88800c07e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1e/0x70 [ 558.938753][ C2] #4: ffff88800c07eae8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_receive_buf_common+0x7c/0xb00 [ 558.938762][ C2] #5: ffffffffacd584c0 (console_lock){+.+.}-{0:0}, at: irq_work_single+0x108/0x210 [ 558.938776][ C2] #6: ffffffffacd58530 (console_srcu){....}-{0:0}, at: console_flush_all+0x12f/0x620 [ 558.938782][ C2] [ 558.938782][ C2] the shortest dependencies between 2nd lock and 1st lock: [ 558.938791][ C2] -> (_xmit_ETHER#2){+.-.}-{3:3} { [ 558.938796][ C2] HARDIRQ-ON-W at: [ 558.938798][ C2] __lock_acquire+0x20b/0x7e0 [ 558.938803][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.938806][ C2] _raw_spin_trylock+0x69/0x80 [ 558.938815][ C2] virtnet_poll_cleantx.isra.0+0x1fe/0x500 [ 558.938821][ C2] virtnet_poll+0xf9/0xad0 [ 558.938825][ C2] __napi_poll.constprop.0+0x9f/0x460 [ 558.938833][ C2] net_rx_action+0x54f/0xda0 [ 558.938836][ C2] handle_softirqs+0x215/0x610 [ 558.938842][ C2] do_softirq+0xad/0xe0 [ 558.938845][ C2] __local_bh_enable_ip+0x101/0x120 [ 558.938848][ C2] virtnet_open+0x228/0xb40 [ 558.938850][ C2] __dev_open+0x224/0x670 [ 558.938852][ C2] __dev_change_flags+0x460/0x6c0 [ 558.938854][ C2] netif_change_flags+0x80/0x160 [ 558.938856][ C2] do_setlink.constprop.0+0x984/0x2640 [ 558.938861][ C2] rtnl_newlink+0x693/0xa60 [ 558.938863][ C2] rtnetlink_rcv_msg+0x709/0xc00 [ 558.938865][ C2] netlink_rcv_skb+0x121/0x340 [ 558.938871][ C2] netlink_unicast+0x4aa/0x780 [ 558.938874][ C2] netlink_sendmsg+0x71d/0xbe0 [ 558.938876][ C2] ____sys_sendmsg+0x3dd/0x890 [ 558.938881][ C2] ___sys_sendmsg+0xed/0x170 [ 558.938884][ C2] __sys_sendmsg+0x10b/0x1a0 [ 558.938887][ C2] do_syscall_64+0xc1/0x370 [ 558.938893][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.938897][ C2] IN-SOFTIRQ-W at: [ 558.938899][ C2] __lock_acquire+0x20b/0x7e0 [ 558.938901][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.938903][ C2] _raw_spin_lock+0x33/0x40 [ 558.938906][ C2] virtnet_poll_tx+0x1da/0x6f0 [ 558.938909][ C2] __napi_poll.constprop.0+0x9f/0x460 [ 558.938912][ C2] net_rx_action+0x54f/0xda0 [ 558.938915][ C2] handle_softirqs+0x215/0x610 [ 558.938918][ C2] do_softirq+0xad/0xe0 [ 558.938921][ C2] __local_bh_enable_ip+0x101/0x120 [ 558.938923][ C2] virtnet_napi_tx_enable+0x1b1/0x270 [ 558.938930][ C2] virtnet_open+0x27c/0xb40 [ 558.938932][ C2] __dev_open+0x224/0x670 [ 558.938934][ C2] __dev_change_flags+0x460/0x6c0 [ 558.938936][ C2] netif_change_flags+0x80/0x160 [ 558.938938][ C2] do_setlink.constprop.0+0x984/0x2640 [ 558.938940][ C2] rtnl_newlink+0x693/0xa60 [ 558.938943][ C2] rtnetlink_rcv_msg+0x709/0xc00 [ 558.938945][ C2] netlink_rcv_skb+0x121/0x340 [ 558.938947][ C2] netlink_unicast+0x4aa/0x780 [ 558.938949][ C2] netlink_sendmsg+0x71d/0xbe0 [ 558.938952][ C2] ____sys_sendmsg+0x3dd/0x890 [ 558.938954][ C2] ___sys_sendmsg+0xed/0x170 [ 558.938957][ C2] __sys_sendmsg+0x10b/0x1a0 [ 558.938960][ C2] do_syscall_64+0xc1/0x370 [ 558.938962][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.938964][ C2] INITIAL USE at: [ 558.938966][ C2] __lock_acquire+0x20b/0x7e0 [ 558.938968][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.938971][ C2] _raw_spin_trylock+0x69/0x80 [ 558.938973][ C2] virtnet_poll_cleantx.isra.0+0x1fe/0x500 [ 558.938976][ C2] virtnet_poll+0xf9/0xad0 [ 558.938978][ C2] __napi_poll.constprop.0+0x9f/0x460 [ 558.938982][ C2] net_rx_action+0x54f/0xda0 [ 558.938985][ C2] handle_softirqs+0x215/0x610 [ 558.938987][ C2] do_softirq+0xad/0xe0 [ 558.938989][ C2] __local_bh_enable_ip+0x101/0x120 [ 558.938992][ C2] virtnet_open+0x228/0xb40 [ 558.938994][ C2] __dev_open+0x224/0x670 [ 558.938996][ C2] __dev_change_flags+0x460/0x6c0 [ 558.938998][ C2] netif_change_flags+0x80/0x160 [ 558.939000][ C2] do_setlink.constprop.0+0x984/0x2640 [ 558.939002][ C2] rtnl_newlink+0x693/0xa60 [ 558.939004][ C2] rtnetlink_rcv_msg+0x709/0xc00 [ 558.939006][ C2] netlink_rcv_skb+0x121/0x340 [ 558.939008][ C2] netlink_unicast+0x4aa/0x780 [ 558.939010][ C2] netlink_sendmsg+0x71d/0xbe0 [ 558.939012][ C2] ____sys_sendmsg+0x3dd/0x890 [ 558.939014][ C2] ___sys_sendmsg+0xed/0x170 [ 558.939017][ C2] __sys_sendmsg+0x10b/0x1a0 [ 558.939020][ C2] do_syscall_64+0xc1/0x370 [ 558.939022][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.939025][ C2] } [ 558.939026][ C2] ... key at: [] netdev_xmit_lock_key+0x10/0x3c0 [ 558.939038][ C2] ... acquired at: [ 558.939040][ C2] __lock_acquire+0x449/0x7e0 [ 558.939042][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939044][ C2] _raw_spin_lock+0x33/0x40 [ 558.939047][ C2] virtnet_poll_tx+0x1da/0x6f0 [ 558.939049][ C2] poll_napi+0xf8/0x250 [ 558.939054][ C2] netpoll_poll_dev+0x264/0x2f0 [ 558.939056][ C2] __netpoll_send_skb+0x6ba/0x8a0 [ 558.939058][ C2] netpoll_send_skb+0x2a/0x90 [ 558.939060][ C2] send_ext_msg_udp+0x422/0x570 [netconsole] [ 558.939069][ C2] write_ext_msg+0x1c6/0x220 [netconsole] [ 558.939073][ C2] console_emit_next_record+0x20a/0x430 [ 558.939076][ C2] console_flush_all+0x3b4/0x620 [ 558.939078][ C2] console_unlock+0xba/0x190 [ 558.939081][ C2] vprintk_emit+0x290/0x2d0 [ 558.939083][ C2] devkmsg_emit.constprop.0+0xab/0xe0 [ 558.939086][ C2] devkmsg_write+0x193/0x300 [ 558.939089][ C2] vfs_write+0xaae/0x12c0 [ 558.939094][ C2] ksys_write+0xf7/0x1d0 [ 558.939097][ C2] do_syscall_64+0xc1/0x370 [ 558.939099][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.939101][ C2] [ 558.939102][ C2] -> (target_list_lock){....}-{3:3} { [ 558.939106][ C2] INITIAL USE at: [ 558.939107][ C2] __lock_acquire+0x20b/0x7e0 [ 558.939110][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939112][ C2] _raw_spin_lock_irqsave+0x42/0x60 [ 558.939115][ C2] netconsole_netdev_event+0x78/0x63e [netconsole] [ 558.939119][ C2] notifier_call_chain+0xcc/0x150 [ 558.939123][ C2] netif_change_name+0x45a/0x920 [ 558.939125][ C2] do_setlink.constprop.0+0x1ca6/0x2640 [ 558.939128][ C2] rtnl_setlink+0x2ad/0x590 [ 558.939130][ C2] rtnetlink_rcv_msg+0x709/0xc00 [ 558.939132][ C2] netlink_rcv_skb+0x121/0x340 [ 558.939134][ C2] netlink_unicast+0x4aa/0x780 [ 558.939136][ C2] netlink_sendmsg+0x71d/0xbe0 [ 558.939139][ C2] __sys_sendto+0x24b/0x380 [ 558.939141][ C2] __x64_sys_sendto+0xe0/0x1b0 [ 558.939144][ C2] do_syscall_64+0xc1/0x370 [ 558.939146][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.939148][ C2] } [ 558.939149][ C2] ... key at: [] target_list_lock+0x18/0x60 [netconsole] [ 558.939154][ C2] ... acquired at: [ 558.939155][ C2] __lock_acquire+0x449/0x7e0 [ 558.939157][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939160][ C2] _raw_spin_lock_irqsave+0x42/0x60 [ 558.939163][ C2] write_msg+0x9a/0x280 [netconsole] [ 558.939167][ C2] console_emit_next_record+0x20a/0x430 [ 558.939170][ C2] console_flush_all+0x3b4/0x620 [ 558.939172][ C2] console_unlock+0xba/0x190 [ 558.939175][ C2] vprintk_emit+0x290/0x2d0 [ 558.939178][ C2] devkmsg_emit.constprop.0+0xab/0xe0 [ 558.939181][ C2] devkmsg_write+0x193/0x300 [ 558.939183][ C2] vfs_write+0xaae/0x12c0 [ 558.939186][ C2] ksys_write+0xf7/0x1d0 [ 558.939187][ C2] do_syscall_64+0xc1/0x370 [ 558.939190][ C2] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 558.939192][ C2] [ 558.939192][ C2] -> (console_owner){-...}-{0:0} { [ 558.939196][ C2] IN-HARDIRQ-W at: [ 558.939197][ C2] __lock_acquire+0x20b/0x7e0 [ 558.939199][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939201][ C2] console_lock_spinning_enable+0x99/0xb0 [ 558.939204][ C2] console_emit_next_record+0x1b2/0x430 [ 558.939207][ C2] console_flush_all+0x3b4/0x620 [ 558.939209][ C2] console_unlock+0xba/0x190 [ 558.939212][ C2] wake_up_klogd_work_func+0x5b/0x80 [ 558.939214][ C2] irq_work_single+0x108/0x210 [ 558.939217][ C2] irq_work_run_list+0x6a/0x90 [ 558.939220][ C2] update_process_times+0x136/0x1a0 [ 558.939226][ C2] tick_nohz_handler+0x319/0x4e0 [ 558.939232][ C2] __run_hrtimer+0x158/0x370 [ 558.939235][ C2] __hrtimer_run_queues+0x194/0x260 [ 558.939238][ C2] hrtimer_interrupt+0x339/0x850 [ 558.939241][ C2] __sysvec_apic_timer_interrupt+0xc6/0x150 [ 558.939246][ C2] sysvec_apic_timer_interrupt+0xa3/0xc0 [ 558.939249][ C2] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 558.939252][ C2] _raw_spin_unlock_irqrestore+0x41/0x70 [ 558.939255][ C2] uart_start+0x1c6/0x5e0 [ 558.939261][ C2] __receive_buf+0x672/0xcd0 [ 558.939264][ C2] n_tty_receive_buf_common+0x15d/0xb00 [ 558.939266][ C2] tty_port_default_receive_buf+0x65/0xa0 [ 558.939270][ C2] flush_to_ldisc+0x1be/0x700 [ 558.939273][ C2] process_one_work+0xe35/0x1650 [ 558.939276][ C2] worker_thread+0x591/0xcf0 [ 558.939278][ C2] kthread+0x37b/0x5f0 [ 558.939283][ C2] ret_from_fork+0x240/0x320 [ 558.939288][ C2] ret_from_fork_asm+0x11/0x20 [ 558.939292][ C2] INITIAL USE at: [ 558.939294][ C2] } [ 558.939295][ C2] ... key at: [] console_owner_dep_map+0x0/0x60 [ 558.939307][ C2] ... acquired at: [ 558.939308][ C2] mark_lock+0x16c/0x2f0 [ 558.939310][ C2] mark_usage+0x11d/0x140 [ 558.939312][ C2] __lock_acquire+0x20b/0x7e0 [ 558.939314][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939316][ C2] console_lock_spinning_enable+0x99/0xb0 [ 558.939319][ C2] console_emit_next_record+0x1b2/0x430 [ 558.939322][ C2] console_flush_all+0x3b4/0x620 [ 558.939324][ C2] console_unlock+0xba/0x190 [ 558.939326][ C2] wake_up_klogd_work_func+0x5b/0x80 [ 558.939329][ C2] irq_work_single+0x108/0x210 [ 558.939332][ C2] irq_work_run_list+0x6a/0x90 [ 558.939334][ C2] update_process_times+0x136/0x1a0 [ 558.939337][ C2] tick_nohz_handler+0x319/0x4e0 [ 558.939340][ C2] __run_hrtimer+0x158/0x370 [ 558.939342][ C2] __hrtimer_run_queues+0x194/0x260 [ 558.939345][ C2] hrtimer_interrupt+0x339/0x850 [ 558.939348][ C2] __sysvec_apic_timer_interrupt+0xc6/0x150 [ 558.939351][ C2] sysvec_apic_timer_interrupt+0xa3/0xc0 [ 558.939354][ C2] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 558.939356][ C2] _raw_spin_unlock_irqrestore+0x41/0x70 [ 558.939359][ C2] uart_start+0x1c6/0x5e0 [ 558.939362][ C2] __receive_buf+0x672/0xcd0 [ 558.939364][ C2] n_tty_receive_buf_common+0x15d/0xb00 [ 558.939367][ C2] tty_port_default_receive_buf+0x65/0xa0 [ 558.939370][ C2] flush_to_ldisc+0x1be/0x700 [ 558.939372][ C2] process_one_work+0xe35/0x1650 [ 558.939375][ C2] worker_thread+0x591/0xcf0 [ 558.939378][ C2] kthread+0x37b/0x5f0 [ 558.939380][ C2] ret_from_fork+0x240/0x320 [ 558.939383][ C2] ret_from_fork_asm+0x11/0x20 [ 558.939385][ C2] [ 558.939385][ C2] [ 558.939385][ C2] stack backtrace: [ 558.939392][ C2] CPU: 2 UID: 0 PID: 178 Comm: kworker/u19:1 Not tainted 6.17.0-rc1-virtme #1 PREEMPT(full) [ 558.939396][ C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 558.939401][ C2] Workqueue: events_unbound flush_to_ldisc [ 558.939407][ C2] Call Trace: [ 558.939411][ C2] [ 558.939415][ C2] dump_stack_lvl+0x82/0xc0 [ 558.939420][ C2] print_irq_inversion_bug.part.0+0x206/0x260 [ 558.939425][ C2] mark_lock_irq+0x248/0x400 [ 558.939431][ C2] mark_lock+0x16c/0x2f0 [ 558.939435][ C2] mark_usage+0x11d/0x140 [ 558.939437][ C2] __lock_acquire+0x20b/0x7e0 [ 558.939442][ C2] lock_acquire.part.0+0xb6/0x240 [ 558.939445][ C2] ? console_lock_spinning_enable+0x7d/0xb0 [ 558.939449][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939456][ C2] ? lock_acquire+0x104/0x160 [ 558.939458][ C2] ? console_lock_spinning_enable+0x7d/0xb0 [ 558.939463][ C2] console_lock_spinning_enable+0x99/0xb0 [ 558.939466][ C2] ? console_lock_spinning_enable+0x7d/0xb0 [ 558.939469][ C2] console_emit_next_record+0x1b2/0x430 [ 558.939473][ C2] ? devkmsg_read+0x460/0x460 [ 558.939477][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939482][ C2] console_flush_all+0x3b4/0x620 [ 558.939487][ C2] ? console_emit_next_record+0x430/0x430 [ 558.939490][ C2] ? __lock_acquire+0x449/0x7e0 [ 558.939495][ C2] console_unlock+0xba/0x190 [ 558.939498][ C2] ? console_flush_all+0x620/0x620 [ 558.939502][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939505][ C2] ? irq_work_single+0x108/0x210 [ 558.939508][ C2] ? irq_work_single+0x108/0x210 [ 558.939513][ C2] wake_up_klogd_work_func+0x5b/0x80 [ 558.939516][ C2] irq_work_single+0x108/0x210 [ 558.939520][ C2] irq_work_run_list+0x6a/0x90 [ 558.939523][ C2] ? irq_work_tick+0x9b/0x140 [ 558.939526][ C2] update_process_times+0x136/0x1a0 [ 558.939530][ C2] tick_nohz_handler+0x319/0x4e0 [ 558.939533][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939537][ C2] __run_hrtimer+0x158/0x370 [ 558.939541][ C2] ? tick_do_update_jiffies64.part.0+0x280/0x280 [ 558.939545][ C2] __hrtimer_run_queues+0x194/0x260 [ 558.939549][ C2] ? hrtimer_interrupt+0x12a/0x850 [ 558.939553][ C2] ? __run_hrtimer+0x370/0x370 [ 558.939556][ C2] ? kvm_clock_get_cycles+0x18/0x30 [ 558.939563][ C2] hrtimer_interrupt+0x339/0x850 [ 558.939567][ C2] ? __common_interrupt+0xa4/0x230 [ 558.939576][ C2] __sysvec_apic_timer_interrupt+0xc6/0x150 [ 558.939579][ C2] sysvec_apic_timer_interrupt+0xa3/0xc0 [ 558.939583][ C2] [ 558.939584][ C2] [ 558.939585][ C2] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 558.939588][ C2] RIP: 0010:_raw_spin_unlock_irqrestore+0x41/0x70 [ 558.939592][ C2] Code: 74 24 10 e8 31 ba f9 fd 48 89 ef e8 59 09 fa fd 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 9a 3d ee fd 65 8b 05 13 5c 03 02 85 c0 74 0a 5b 5d c3 e8 d7 be [ 558.939595][ C2] RSP: 0018:ffffc90000787a68 EFLAGS: 00000206 [ 558.939601][ C2] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 0000000000000080 [ 558.939603][ C2] RDX: 0000000000000000 RSI: ffffffffac7ea7a3 RDI: 0000000000000001 [ 558.939605][ C2] RBP: ffffffffaf067760 R08: 0000000000000001 R09: 0000000000000001 [ 558.939606][ C2] R10: ffffffffad61c117 R11: ffff888005fb0970 R12: ffffffffaf067868 [ 558.939608][ C2] R13: 00000000ffffffff R14: 0000000000000286 R15: ffffffffaf0678a0 [ 558.939615][ C2] uart_start+0x1c6/0x5e0 [ 558.939619][ C2] __receive_buf+0x672/0xcd0 [ 558.939625][ C2] n_tty_receive_buf_common+0x15d/0xb00 [ 558.939632][ C2] tty_port_default_receive_buf+0x65/0xa0 [ 558.939636][ C2] flush_to_ldisc+0x1be/0x700 [ 558.939641][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939646][ C2] process_one_work+0xe35/0x1650 [ 558.939652][ C2] ? pwq_dec_nr_in_flight+0x550/0x550 [ 558.939658][ C2] ? assign_work+0x168/0x240 [ 558.939662][ C2] worker_thread+0x591/0xcf0 [ 558.939668][ C2] ? rescuer_thread+0xd10/0xd10 [ 558.939672][ C2] kthread+0x37b/0x5f0 [ 558.939676][ C2] ? kthread_is_per_cpu+0xc0/0xc0 [ 558.939679][ C2] ? ret_from_fork+0x1b/0x320 [ 558.939681][ C2] ? __lock_release+0x5d/0x170 [ 558.939684][ C2] ? rcu_is_watching+0x12/0xb0 [ 558.939688][ C2] ? kthread_is_per_cpu+0xc0/0xc0 [ 558.939692][ C2] ret_from_fork+0x240/0x320 [ 558.939694][ C2] ? kthread_is_per_cpu+0xc0/0xc0 [ 558.939697][ C2] ret_from_fork_asm+0x11/0x20 [ 558.939704][ C2]