------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Not tainted ------------------------------------------------------ ksoftirqd/1/23 is trying to acquire lock: ffff800086de9720 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x7c/0xbc kernel/printk/printk.c:1920 but task is already holding lock: ffff000069fabe18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:598 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 _raw_spin_lock_nested+0x50/0x6c kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested kernel/sched/core.c:598 [inline] raw_spin_rq_lock kernel/sched/sched.h:1514 [inline] task_rq_lock+0xd0/0x2fc kernel/sched/core.c:700 cgroup_move_task+0x88/0x194 kernel/sched/psi.c:1161 css_set_move_task+0x1b8/0x3f8 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x12c/0x5b0 kernel/cgroup/cgroup.c:6691 copy_process+0x33d8/0x50e0 kernel/fork.c:2601 kernel_clone+0x140/0x7ec kernel/fork.c:2787 user_mode_thread+0xb4/0xf0 kernel/fork.c:2865 rest_init+0x2c/0x210 init/main.c:712 start_kernel+0x35c/0x3d4 init/main.c:1102 __primary_switched+0x8c/0x94 arch/arm64/kernel/head.S:246 -> #3 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x58/0x80 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb4/0x18d8 kernel/sched/core.c:4205 default_wake_function+0x34/0x54 kernel/sched/core.c:7090 woken_wake_function+0x4c/0x74 kernel/sched/wait.c:444 __wake_up_common+0x134/0x1e4 kernel/sched/wait.c:89 __wake_up_common_lock kernel/sched/wait.c:106 [inline] __wake_up+0x44/0x70 kernel/sched/wait.c:127 pty_close+0x1d0/0x424 drivers/tty/pty.c:68 tty_release+0x298/0xf98 drivers/tty/tty_io.c:1754 __fput+0x2c4/0x94c fs/file_table.c:450 ____fput+0x14/0x20 fs/file_table.c:478 task_work_run+0x128/0x210 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d0/0x258 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0x100/0x180 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (&tty->write_wait){....}-{3:3}: lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x58/0x80 kernel/locking/spinlock.c:162 __wake_up_common_lock kernel/sched/wait.c:105 [inline] __wake_up+0x28/0x70 kernel/sched/wait.c:127 tty_wakeup+0x4c/0xd8 drivers/tty/tty_io.c:521 tty_port_default_wakeup+0x20/0x38 drivers/tty/tty_port.c:69 tty_port_tty_wakeup+0x54/0x74 drivers/tty/tty_port.c:435 uart_write_wakeup+0x38/0x54 drivers/tty/serial/serial_core.c:120 pl011_tx_chars+0x5f4/0xb48 drivers/tty/serial/amba-pl011.c:1478 pl011_start_tx_pio drivers/tty/serial/amba-pl011.c:1320 [inline] pl011_start_tx+0x2dc/0xaf0 drivers/tty/serial/amba-pl011.c:1362 __uart_start+0x1b0/0x35c drivers/tty/serial/serial_core.c:160 uart_write+0x160/0x85c drivers/tty/serial/serial_core.c:635 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x308/0xb90 drivers/tty/n_tty.c:2389 iterate_tty_write drivers/tty/tty_io.c:1015 [inline] file_tty_write.constprop.0+0x2c4/0x624 drivers/tty/tty_io.c:1090 tty_write drivers/tty/tty_io.c:1111 [inline] redirected_tty_write drivers/tty/tty_io.c:1134 [inline] redirected_tty_write+0xd8/0x130 drivers/tty/tty_io.c:1114 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x4b0/0xad0 fs/read_write.c:679 ksys_write+0xec/0x1d8 fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __arm64_sys_write+0x6c/0x9c fs/read_write.c:739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (&port_lock_key){-.-.}-{3:3}: lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x58/0x80 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:715 [inline] pl011_console_write+0x10c/0x9dc drivers/tty/serial/amba-pl011.c:2316 console_emit_next_record kernel/printk/printk.c:3122 [inline] console_flush_all+0x488/0x8dc kernel/printk/printk.c:3210 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0xd0/0x1c4 kernel/printk/printk.c:3309 vprintk_emit+0x37c/0x498 kernel/printk/printk.c:2432 vprintk_default+0x38/0x44 kernel/printk/printk.c:2447 vprintk+0x40/0x90 kernel/printk/printk_safe.c:86 _printk+0xa8/0xe0 kernel/printk/printk.c:2457 register_console+0x7fc/0xca0 kernel/printk/printk.c:4099 uart_configure_port drivers/tty/serial/serial_core.c:2655 [inline] serial_core_add_one_port drivers/tty/serial/serial_core.c:3182 [inline] serial_core_register_port+0x1324/0x1cb4 drivers/tty/serial/serial_core.c:3419 serial_ctrl_register_port+0x10/0x1c drivers/tty/serial/serial_ctrl.c:41 uart_add_one_port+0x10/0x1c drivers/tty/serial/serial_port.c:143 pl011_register_port+0x10c/0x2ac drivers/tty/serial/amba-pl011.c:2744 pl011_probe+0x490/0x5f4 drivers/tty/serial/amba-pl011.c:2809 amba_probe+0x1c0/0x358 drivers/amba/bus.c:308 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x180/0x7dc drivers/base/dd.c:658 __driver_probe_device+0x15c/0x364 drivers/base/dd.c:800 driver_probe_device+0x5c/0x16c drivers/base/dd.c:830 __device_attach_driver+0x16c/0x270 drivers/base/dd.c:958 bus_for_each_drv+0x104/0x18c drivers/base/bus.c:459 __device_attach+0x168/0x35c drivers/base/dd.c:1030 device_initial_probe+0x14/0x20 drivers/base/dd.c:1079 bus_probe_device+0x124/0x15c drivers/base/bus.c:534 device_add+0xc2c/0x12b8 drivers/base/core.c:3672 amba_device_add+0x70/0x110 drivers/amba/bus.c:575 of_amba_device_create drivers/of/platform.c:257 [inline] of_platform_bus_create+0x554/0x768 drivers/of/platform.c:376 of_platform_populate+0x58/0x160 drivers/of/platform.c:470 of_platform_default_populate drivers/of/platform.c:487 [inline] of_platform_default_populate_init+0xf4/0x118 drivers/of/platform.c:595 do_one_initcall+0x130/0x770 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x484/0x6c0 init/main.c:1577 kernel_init+0x24/0x1e0 init/main.c:1466 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x2b88/0x660c kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x224/0x4f4 kernel/locking/lockdep.c:5849 lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 console_lock_spinning_enable+0xa0/0xbc kernel/printk/printk.c:1924 console_emit_next_record kernel/printk/printk.c:3116 [inline] console_flush_all+0x43c/0x8dc kernel/printk/printk.c:3210 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0xd0/0x1c4 kernel/printk/printk.c:3309 vprintk_emit+0x37c/0x498 kernel/printk/printk.c:2432 vprintk_default+0x38/0x44 kernel/printk/printk.c:2447 vprintk+0x40/0x90 kernel/printk/printk_safe.c:86 _printk+0xa8/0xe0 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x33c/0x47c lib/bug.c:219 bug_handler+0x3c/0x94 arch/arm64/kernel/traps.c:1010 call_break_hook arch/arm64/kernel/debug-monitors.c:315 [inline] brk_handler+0x10c/0x1f8 arch/arm64/kernel/debug-monitors.c:325 do_debug_exception+0xb8/0x310 arch/arm64/mm/fault.c:1002 el1_dbg+0x80/0x9c arch/arm64/kernel/entry-common.c:490 el1h_64_sync_handler+0xe8/0x124 arch/arm64/kernel/entry-common.c:536 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 enqueue_dl_entity+0x1018/0x1d50 kernel/sched/deadline.c:2029 dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 enqueue_task_fair+0x364/0xed8 kernel/sched/fair.c:7038 enqueue_task+0x68/0x254 kernel/sched/core.c:2061 activate_task+0x64/0xdc kernel/sched/core.c:2108 attach_task+0xd4/0x150 kernel/sched/fair.c:9635 attach_tasks kernel/sched/fair.c:9670 [inline] sched_balance_rq+0xdb0/0x254c kernel/sched/fair.c:11747 sched_balance_newidle+0x54c/0xe70 kernel/sched/fair.c:12789 pick_next_task_fair+0x54/0xd48 kernel/sched/fair.c:8937 __pick_next_task kernel/sched/core.c:6023 [inline] pick_next_task kernel/sched/core.c:6542 [inline] __schedule+0x420/0x2db0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6848 smpboot_thread_fn+0x2a0/0x8e4 kernel/smpboot.c:160 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 other info that might help us debug this: Chain exists of: console_owner --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock(console_owner); *** DEADLOCK *** 4 locks held by ksoftirqd/1/23: #0: ffff800086ed8960 (rcu_read_lock){....}-{1:3}, at: rcu_read_unlock include/linux/rcupdate.h:878 [inline] #0: ffff800086ed8960 (rcu_read_lock){....}-{1:3}, at: sched_balance_newidle+0x354/0xe70 kernel/sched/fair.c:12771 #1: ffff000069fabe18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:598 #2: ffff800086de91e0 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x38/0x44 kernel/printk/printk.c:2447 #3: ffff800086de9430 (console_srcu){....}-{0:0}, at: console_flush_all+0x120/0x8dc kernel/printk/printk.c:3180 stack backtrace: CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x428/0x704 kernel/locking/lockdep.c:2074 check_noncircular+0x2dc/0x364 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x2b88/0x660c kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x224/0x4f4 kernel/locking/lockdep.c:5849 lock_acquire+0x90/0xb4 kernel/locking/lockdep.c:5822 console_lock_spinning_enable+0xa0/0xbc kernel/printk/printk.c:1924 console_emit_next_record kernel/printk/printk.c:3116 [inline] console_flush_all+0x43c/0x8dc kernel/printk/printk.c:3210 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0xd0/0x1c4 kernel/printk/printk.c:3309 vprintk_emit+0x37c/0x498 kernel/printk/printk.c:2432 vprintk_default+0x38/0x44 kernel/printk/printk.c:2447 vprintk+0x40/0x90 kernel/printk/printk_safe.c:86 _printk+0xa8/0xe0 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x33c/0x47c lib/bug.c:219 bug_handler+0x3c/0x94 arch/arm64/kernel/traps.c:1010 call_break_hook arch/arm64/kernel/debug-monitors.c:315 [inline] brk_handler+0x10c/0x1f8 arch/arm64/kernel/debug-monitors.c:325 do_debug_exception+0xb8/0x310 arch/arm64/mm/fault.c:1002 el1_dbg+0x80/0x9c arch/arm64/kernel/entry-common.c:490 el1h_64_sync_handler+0xe8/0x124 arch/arm64/kernel/entry-common.c:536 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 enqueue_dl_entity+0x1018/0x1d50 kernel/sched/deadline.c:2029 (P) dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 (L) dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 enqueue_task_fair+0x364/0xed8 kernel/sched/fair.c:7038 enqueue_task+0x68/0x254 kernel/sched/core.c:2061 activate_task+0x64/0xdc kernel/sched/core.c:2108 attach_task+0xd4/0x150 kernel/sched/fair.c:9635 attach_tasks kernel/sched/fair.c:9670 [inline] sched_balance_rq+0xdb0/0x254c kernel/sched/fair.c:11747 sched_balance_newidle+0x54c/0xe70 kernel/sched/fair.c:12789 pick_next_task_fair+0x54/0xd48 kernel/sched/fair.c:8937 __pick_next_task kernel/sched/core.c:6023 [inline] pick_next_task kernel/sched/core.c:6542 [inline] __schedule+0x420/0x2db0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6848 smpboot_thread_fn+0x2a0/0x8e4 kernel/smpboot.c:160 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 WARNING: CPU: 1 PID: 23 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x1018/0x1d50 kernel/sched/deadline.c:2029 Modules linked in: CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Hardware name: linux,dummy-virt (DT) pstate: a00000c5 (NzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : enqueue_dl_entity+0x1018/0x1d50 kernel/sched/deadline.c:1995 lr : dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 sp : ffff80008d057530 x29: ffff80008d057530 x28: dfff800000000000 x27: 0000000000000000 x26: 0000000000000007 x25: 0000000000000001 x24: ffff000069fabe00 x23: ffff000069fac7e8 x22: 1fffe0000d3f5918 x21: 1fffe0000d3f5907 x20: ffff000069fac83c x19: ffff000069fac7e8 x18: 00000000ab2e5a45 x17: 0000000000000000 x16: 0000000000000000 x15: 1fffe00001b64ca4 x14: 1ffff000110ce4ff x13: ffff00000db26540 x12: ffff600001b11813 x11: 1fffe00001b11812 x10: ffff600001b11812 x9 : dfff800000000000 x8 : 1fffe0000d3f57db x7 : 0000000000000001 x6 : 0000000000000000 x5 : 1fffe0000d3f593d x4 : 1fffe00001b4f7aa x3 : 1fffe0000d3f5808 x2 : dfff800000000000 x1 : 0000000000000000 x0 : 0000000000000001 Call trace: enqueue_dl_entity+0x1018/0x1d50 kernel/sched/deadline.c:2029 (P) dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 (L) dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 enqueue_task_fair+0x364/0xed8 kernel/sched/fair.c:7038 enqueue_task+0x68/0x254 kernel/sched/core.c:2061 activate_task+0x64/0xdc kernel/sched/core.c:2108 attach_task+0xd4/0x150 kernel/sched/fair.c:9635 attach_tasks kernel/sched/fair.c:9670 [inline] sched_balance_rq+0xdb0/0x254c kernel/sched/fair.c:11747 sched_balance_newidle+0x54c/0xe70 kernel/sched/fair.c:12789 pick_next_task_fair+0x54/0xd48 kernel/sched/fair.c:8937 __pick_next_task kernel/sched/core.c:6023 [inline] pick_next_task kernel/sched/core.c:6542 [inline] __schedule+0x420/0x2db0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6848 smpboot_thread_fn+0x2a0/0x8e4 kernel/smpboot.c:160 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 irq event stamp: 586054 hardirqs last enabled at (586053): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1526 [inline] hardirqs last enabled at (586053): [] finish_lock_switch kernel/sched/core.c:5123 [inline] hardirqs last enabled at (586053): [] finish_task_switch.isra.0+0x1a8/0x8e0 kernel/sched/core.c:5241 hardirqs last disabled at (586054): [] __schedule+0xbc0/0x2db0 kernel/sched/core.c:6660 softirqs last enabled at (586048): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (586048): [] handle_softirqs+0x87c/0xd44 kernel/softirq.c:582 softirqs last disabled at (586013): [] run_ksoftirqd kernel/softirq.c:943 [inline] softirqs last disabled at (586013): [] run_ksoftirqd+0x90/0xcc kernel/softirq.c:935 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 1 PID: 23 at kernel/sched/deadline.c:1971 enqueue_dl_entity+0x1020/0x1d50 kernel/sched/deadline.c:1995 Modules linked in: CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Tainted: G W 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: a00000c5 (NzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __enqueue_dl_entity kernel/sched/deadline.c:1971 [inline] pc : enqueue_dl_entity+0x1020/0x1d50 kernel/sched/deadline.c:2068 lr : rq_clock kernel/sched/sched.h:1653 [inline] lr : replenish_dl_new_period kernel/sched/deadline.c:777 [inline] lr : update_dl_entity kernel/sched/deadline.c:1089 [inline] lr : enqueue_dl_entity+0x928/0x1d50 kernel/sched/deadline.c:2041 sp : ffff80008d057530 x29: ffff80008d057530 x28: ffff000069fac828 x27: ffff000069fac780 x26: ffff000069fac7e8 x25: 00000000000000b0 x24: 0000000002faf080 x23: ffff000069fac7e8 x22: ffff000069fabe00 x21: ffff000069fac83c x20: 0000000000000004 x19: 1fffe0000d3f5907 x18: 00000000ab2e5a45 x17: 0000000000000000 x16: 0000000000000000 x15: 1fffe00001b64ca4 x14: 1ffff000110ce4ff x13: ffff00000db26540 x12: ffff600001b11813 x11: 1fffe00001b11812 x10: ffff600001b11812 x9 : 0000034cae337910 x8 : 1fffe0000d3f5900 x7 : 0000000000000000 x6 : 1fffe0000d3f5902 x5 : 1fffe0000d3f591b x4 : 1fffe0000d3f5901 x3 : dfff800000000000 x2 : 0000000000000030 x1 : 1fffe0000d3f58fd x0 : 0000000000000001 Call trace: enqueue_dl_entity+0x1020/0x1d50 kernel/sched/deadline.c:1995 (P) rq_clock kernel/sched/sched.h:1653 [inline] (L) replenish_dl_new_period kernel/sched/deadline.c:777 [inline] (L) update_dl_entity kernel/sched/deadline.c:1089 [inline] (L) enqueue_dl_entity+0x928/0x1d50 kernel/sched/deadline.c:2041 (L) dl_server_start+0xb4/0x648 kernel/sched/deadline.c:1650 enqueue_task_fair+0x364/0xed8 kernel/sched/fair.c:7038 enqueue_task+0x68/0x254 kernel/sched/core.c:2061 activate_task+0x64/0xdc kernel/sched/core.c:2108 attach_task+0xd4/0x150 kernel/sched/fair.c:9635 attach_tasks kernel/sched/fair.c:9670 [inline] sched_balance_rq+0xdb0/0x254c kernel/sched/fair.c:11747 sched_balance_newidle+0x54c/0xe70 kernel/sched/fair.c:12789 pick_next_task_fair+0x54/0xd48 kernel/sched/fair.c:8937 __pick_next_task kernel/sched/core.c:6023 [inline] pick_next_task kernel/sched/core.c:6542 [inline] __schedule+0x420/0x2db0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6848 smpboot_thread_fn+0x2a0/0x8e4 kernel/smpboot.c:160 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 irq event stamp: 586054 hardirqs last enabled at (586053): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1526 [inline] hardirqs last enabled at (586053): [] finish_lock_switch kernel/sched/core.c:5123 [inline] hardirqs last enabled at (586053): [] finish_task_switch.isra.0+0x1a8/0x8e0 kernel/sched/core.c:5241 hardirqs last disabled at (586054): [] __schedule+0xbc0/0x2db0 kernel/sched/core.c:6660 softirqs last enabled at (586048): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (586048): [] handle_softirqs+0x87c/0xd44 kernel/softirq.c:582 softirqs last disabled at (586013): [] run_ksoftirqd kernel/softirq.c:943 [inline] softirqs last disabled at (586013): [] run_ksoftirqd+0x90/0xcc kernel/softirq.c:935 ---[ end trace 0000000000000000 ]---