[ 44.170130][ C0] clocksource: Watchdog remote CPU 2 read timed out [ 44.170575][ C0] [ 44.170577][ C0] ======================================================== [ 44.170579][ C0] WARNING: possible irq lock inversion dependency detected [ 44.170581][ C0] 7.2.0-virtme #1 Tainted: G W [ 44.170583][ C0] -------------------------------------------------------- [ 44.170584][ C0] tls/1178 just changed the state of lock: [ 44.170586][ C0] ffffffff9669d760 (console_owner){..-.}-{0:0}, at: console_lock_spinning_enable+0x40/0x60 [ 44.170600][ C0] but this lock took another, SOFTIRQ-unsafe lock in the past: [ 44.170601][ C0] (fs_reclaim){+.+.}-{0:0} [ 44.170604][ C0] [ 44.170604][ C0] [ 44.170604][ C0] and interrupts could create inverse lock ordering between them. [ 44.170604][ C0] [ 44.170605][ C0] [ 44.170605][ C0] other info that might help us debug this: [ 44.170606][ C0] Possible interrupt unsafe locking scenario: [ 44.170606][ C0] [ 44.170606][ C0] CPU0 CPU1 [ 44.170607][ C0] ---- ---- [ 44.170607][ C0] lock(fs_reclaim); [ 44.170608][ C0] local_irq_disable(); [ 44.170609][ C0] lock(console_owner); [ 44.170610][ C0] lock(fs_reclaim); [ 44.170611][ C0] [ 44.170611][ C0] lock(console_owner); [ 44.170612][ C0] [ 44.170612][ C0] *** DEADLOCK *** [ 44.170612][ C0] [ 44.170612][ C0] locks held by tls/1178: 4, last CPU#0: [ 44.170614][ C0] #0: ffa0000000007c90 ((&watchdog_timer)){+.-.}-{0:0}, at: call_timer_fn+0x110/0x4d0 [ 44.170619][ C0] #1: ffffffff967e29f8 (watchdog_lock){+.-.}-{3:3}, at: clocksource_watchdog+0x15/0x30 [ 44.170623][ C0] #2: ffffffff9677ddc0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x320/0x3e0 [ 44.170626][ C0] #3: ffffffff9677de38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0x106/0x710 [ 44.170629][ C0] [ 44.170629][ C0] the shortest dependencies between 2nd lock and 1st lock: [ 44.170633][ C0] -> (fs_reclaim){+.+.}-{0:0} { [ 44.170635][ C0] HARDIRQ-ON-W at: [ 44.170637][ C0] __lock_acquire+0x388/0xc20 [ 44.170641][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170642][ C0] fs_reclaim_acquire+0xd5/0x120 [ 44.170645][ C0] __kmalloc_cache_noprof+0x6e/0x620 [ 44.170647][ C0] kthread_create_worker_on_node+0xea/0x210 [ 44.170650][ C0] workqueue_init+0x2a/0x680 [ 44.170654][ C0] kernel_init_freeable+0x2fe/0x630 [ 44.170657][ C0] kernel_init+0x21/0x150 [ 44.170661][ C0] ret_from_fork+0x474/0x6b0 [ 44.170664][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170667][ C0] SOFTIRQ-ON-W at: [ 44.170668][ C0] __lock_acquire+0x388/0xc20 [ 44.170669][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170670][ C0] fs_reclaim_acquire+0xd5/0x120 [ 44.170672][ C0] __kmalloc_cache_noprof+0x6e/0x620 [ 44.170673][ C0] kthread_create_worker_on_node+0xea/0x210 [ 44.170674][ C0] workqueue_init+0x2a/0x680 [ 44.170676][ C0] kernel_init_freeable+0x2fe/0x630 [ 44.170677][ C0] kernel_init+0x21/0x150 [ 44.170679][ C0] ret_from_fork+0x474/0x6b0 [ 44.170680][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170681][ C0] INITIAL USE at: [ 44.170682][ C0] __lock_acquire+0x388/0xc20 [ 44.170683][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170685][ C0] fs_reclaim_acquire+0xd5/0x120 [ 44.170686][ C0] __kmalloc_cache_noprof+0x6e/0x620 [ 44.170687][ C0] kthread_create_worker_on_node+0xea/0x210 [ 44.170688][ C0] workqueue_init+0x2a/0x680 [ 44.170690][ C0] kernel_init_freeable+0x2fe/0x630 [ 44.170691][ C0] kernel_init+0x21/0x150 [ 44.170693][ C0] ret_from_fork+0x474/0x6b0 [ 44.170694][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170695][ C0] } [ 44.170696][ C0] ... key at: [] __fs_reclaim_map+0x0/0xbe0 [ 44.170700][ C0] ... acquired at: [ 44.170701][ C0] __lock_acquire+0x518/0xc20 [ 44.170702][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170703][ C0] fs_reclaim_acquire+0xd5/0x120 [ 44.170705][ C0] __kmalloc_noprof+0xd3/0x760 [ 44.170706][ C0] alloc_buf.isra.0+0x4b/0x260 [ 44.170710][ C0] put_chars+0x1e1/0x2f0 [ 44.170711][ C0] hvc_console_print+0x292/0x780 [ 44.170714][ C0] console_emit_next_record+0x22f/0x4c0 [ 44.170715][ C0] console_flush_one_record+0x46f/0x710 [ 44.170717][ C0] console_unlock+0xee/0x1f0 [ 44.170719][ C0] vprintk_emit+0x37c/0x3e0 [ 44.170720][ C0] _printk+0xc7/0x100 [ 44.170723][ C0] tun_init+0x24/0xb0 [ 44.170725][ C0] do_one_initcall+0x124/0x4f0 [ 44.170727][ C0] kernel_init_freeable+0x596/0x630 [ 44.170728][ C0] kernel_init+0x21/0x150 [ 44.170729][ C0] ret_from_fork+0x474/0x6b0 [ 44.170730][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170732][ C0] [ 44.170732][ C0] -> (console_owner){..-.}-{0:0} { [ 44.170734][ C0] IN-SOFTIRQ-W at: [ 44.170734][ C0] __lock_acquire+0x388/0xc20 [ 44.170736][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170737][ C0] console_lock_spinning_enable+0x5c/0x60 [ 44.170739][ C0] console_emit_next_record+0x1d1/0x4c0 [ 44.170741][ C0] console_flush_one_record+0x46f/0x710 [ 44.170742][ C0] console_unlock+0xee/0x1f0 [ 44.170744][ C0] vprintk_emit+0x37c/0x3e0 [ 44.170745][ C0] _printk+0xc7/0x100 [ 44.170746][ C0] clocksource_watchdog.part.0.cold+0x105/0x1dd [ 44.170748][ C0] call_timer_fn+0x160/0x4d0 [ 44.170750][ C0] __run_timers+0x68f/0xaa0 [ 44.170751][ C0] run_timer_softirq+0xf0/0x160 [ 44.170753][ C0] handle_softirqs+0x1d3/0x900 [ 44.170756][ C0] __irq_exit_rcu+0x145/0x1c0 [ 44.170757][ C0] irq_exit_rcu+0xe/0x30 [ 44.170758][ C0] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 44.170760][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 44.170762][ C0] free_percpu+0x4/0x20 [ 44.170765][ C0] __mmdrop+0xbb/0x430 [ 44.170767][ C0] finish_task_switch.isra.0+0x6c4/0xa70 [ 44.170769][ C0] schedule_tail+0x13/0xe0 [ 44.170770][ C0] ret_from_fork+0x71/0x6b0 [ 44.170771][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170773][ C0] INITIAL USE at: [ 44.170774][ C0] } [ 44.170774][ C0] ... key at: [] console_owner_dep_map+0x0/0x60 [ 44.170776][ C0] ... acquired at: [ 44.170777][ C0] mark_lock+0x1d7/0xa00 [ 44.170778][ C0] mark_usage+0x42/0x170 [ 44.170780][ C0] __lock_acquire+0x388/0xc20 [ 44.170781][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170782][ C0] console_lock_spinning_enable+0x5c/0x60 [ 44.170784][ C0] console_emit_next_record+0x1d1/0x4c0 [ 44.170785][ C0] console_flush_one_record+0x46f/0x710 [ 44.170787][ C0] console_unlock+0xee/0x1f0 [ 44.170788][ C0] vprintk_emit+0x37c/0x3e0 [ 44.170789][ C0] _printk+0xc7/0x100 [ 44.170791][ C0] clocksource_watchdog.part.0.cold+0x105/0x1dd [ 44.170792][ C0] call_timer_fn+0x160/0x4d0 [ 44.170793][ C0] __run_timers+0x68f/0xaa0 [ 44.170795][ C0] run_timer_softirq+0xf0/0x160 [ 44.170796][ C0] handle_softirqs+0x1d3/0x900 [ 44.170797][ C0] __irq_exit_rcu+0x145/0x1c0 [ 44.170799][ C0] irq_exit_rcu+0xe/0x30 [ 44.170800][ C0] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 44.170801][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 44.170802][ C0] free_percpu+0x4/0x20 [ 44.170803][ C0] __mmdrop+0xbb/0x430 [ 44.170804][ C0] finish_task_switch.isra.0+0x6c4/0xa70 [ 44.170805][ C0] schedule_tail+0x13/0xe0 [ 44.170806][ C0] ret_from_fork+0x71/0x6b0 [ 44.170808][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170809][ C0] [ 44.170809][ C0] [ 44.170809][ C0] stack backtrace: [ 44.170812][ C0] CPU: 0 UID: 0 PID: 1178 Comm: tls Tainted: G W 7.2.0-virtme #1 PREEMPT(full) [ 44.170815][ C0] Tainted: [W]=WARN [ 44.170816][ C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 44.170818][ C0] Call Trace: [ 44.170819][ C0] [ 44.170820][ C0] dump_stack_lvl+0x6f/0xa0 [ 44.170825][ C0] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 44.170835][ C0] mark_lock_irq+0x989/0x9c0 [ 44.170836][ C0] ? add_lock_to_list+0x2c/0x1a0 [ 44.170839][ C0] mark_lock+0x1d7/0xa00 [ 44.170841][ C0] mark_usage+0x42/0x170 [ 44.170843][ C0] __lock_acquire+0x388/0xc20 [ 44.170845][ C0] lock_acquire.part.0+0xd4/0x280 [ 44.170847][ C0] ? console_lock_spinning_enable+0x40/0x60 [ 44.170849][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.170851][ C0] ? lock_acquire+0x13c/0x160 [ 44.170853][ C0] console_lock_spinning_enable+0x5c/0x60 [ 44.170855][ C0] ? console_lock_spinning_enable+0x40/0x60 [ 44.170856][ C0] console_emit_next_record+0x1d1/0x4c0 [ 44.170858][ C0] ? devkmsg_read+0x4b0/0x4b0 [ 44.170860][ C0] ? console_flush_one_record+0x106/0x710 [ 44.170862][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.170863][ C0] ? lock_acquire+0x13c/0x160 [ 44.170865][ C0] console_flush_one_record+0x46f/0x710 [ 44.170867][ C0] ? console_emit_next_record+0x4c0/0x4c0 [ 44.170869][ C0] ? __lock_acquire+0x518/0xc20 [ 44.170871][ C0] console_unlock+0xee/0x1f0 [ 44.170873][ C0] ? console_flush_one_record+0x710/0x710 [ 44.170874][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.170875][ C0] ? lock_acquire+0xe0/0x160 [ 44.170877][ C0] ? __down_trylock_console_sem+0x5e/0xa0 [ 44.170879][ C0] ? vprintk_emit+0x320/0x3e0 [ 44.170880][ C0] vprintk_emit+0x37c/0x3e0 [ 44.170882][ C0] ? wake_up_klogd_work_func+0x90/0x90 [ 44.170883][ C0] ? clocksource_watchdog.part.0+0x450/0x540 [ 44.170885][ C0] _printk+0xc7/0x100 [ 44.170887][ C0] ? snapshot_read.cold+0x21/0x21 [ 44.170889][ C0] ? clocksource_watchdog.part.0+0x450/0x540 [ 44.170890][ C0] ? __lock_release.isra.0+0x69/0x1a0 [ 44.170892][ C0] clocksource_watchdog.part.0.cold+0x105/0x1dd [ 44.170894][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.170895][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.170897][ C0] call_timer_fn+0x160/0x4d0 [ 44.170899][ C0] ? sysvec_apic_timer_interrupt+0x4c/0xe0 [ 44.170900][ C0] ? detach_if_pending+0x1d0/0x1d0 [ 44.170903][ C0] ? _raw_spin_unlock_irq+0x28/0x50 [ 44.170905][ C0] __run_timers+0x68f/0xaa0 [ 44.170907][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.170909][ C0] ? __bpf_trace_itimer_expire+0x10/0x10 [ 44.170911][ C0] ? __lock_acquire+0x518/0xc20 [ 44.170913][ C0] ? __rwlock_init+0x150/0x150 [ 44.170916][ C0] run_timer_softirq+0xf0/0x160 [ 44.170918][ C0] ? __run_timers+0xaa0/0xaa0 [ 44.170920][ C0] ? handle_softirqs+0x19c/0x900 [ 44.170921][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.170922][ C0] handle_softirqs+0x1d3/0x900 [ 44.170924][ C0] ? __lock_release.isra.0+0x69/0x1a0 [ 44.170926][ C0] ? _local_bh_enable+0xc0/0xc0 [ 44.170928][ C0] __irq_exit_rcu+0x145/0x1c0 [ 44.170929][ C0] irq_exit_rcu+0xe/0x30 [ 44.170931][ C0] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 44.170932][ C0] [ 44.170933][ C0] [ 44.170933][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 44.170935][ C0] RIP: 0010:free_percpu+0x4/0x20 [ 44.170937][ C0] Code: e9 fe fa ff ff 4c 89 ef 89 04 24 e8 d6 60 1a 00 8b 04 24 e9 4d fc ff ff 0f 1f 00 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> 1f 44 00 00 48 85 ff 74 05 e9 7d f3 ff ff c3 90 66 66 2e 0f 1f [ 44.170939][ C0] RSP: 0018:ffa000000258fde0 EFLAGS: 00000246 [ 44.170941][ C0] RAX: dffffc0000000000 RBX: ff11000001074cc0 RCX: 0000000000000001 [ 44.170943][ C0] RDX: 1fe220000020e9e8 RSI: 0000000000000004 RDI: 00c0ffff2b621d10 [ 44.170944][ C0] RBP: ff11000001074f40 R08: ffffffff92aa4f2a R09: 1fe220000020e998 [ 44.170944][ C0] R10: ffe21c000020e999 R11: ffe21c000020e999 R12: ff1100000f3723c0 [ 44.170945][ C0] R13: ff1100000f3723c0 R14: ff11000001074cc0 R15: ff1100006c038fc0 [ 44.170946][ C0] ? finish_task_switch.isra.0+0x28a/0xa70 [ 44.170948][ C0] __mmdrop+0xbb/0x430 [ 44.170950][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.170951][ C0] finish_task_switch.isra.0+0x6c4/0xa70 [ 44.170953][ C0] schedule_tail+0x13/0xe0 [ 44.170955][ C0] ret_from_fork+0x71/0x6b0 [ 44.170956][ C0] ? arch_exit_to_user_mode_prepare.isra.0+0x120/0x120 [ 44.170958][ C0] ? __switch_to+0x5a3/0xe00 [ 44.170965][ C0] ret_from_fork_asm+0x11/0x20 [ 44.170968][ C0] [ 44.170972][ C0] BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:322 [ 44.170974][ C0] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1178, name: tls [ 44.170975][ C0] preempt_count: 103, expected: 0 [ 44.170976][ C0] RCU nest depth: 0, expected: 0 [ 44.170977][ C0] INFO: lockdep is turned off. [ 44.170977][ C0] irq event stamp: 377 [ 44.170978][ C0] hardirqs last enabled at (376): [] __down_trylock_console_sem+0x86/0xa0 [ 44.170980][ C0] hardirqs last disabled at (377): [] console_emit_next_record+0x3d4/0x4c0 [ 44.170982][ C0] softirqs last enabled at (0): [] copy_process+0x1d8f/0x62b0 [ 44.170984][ C0] softirqs last disabled at (29): [] __irq_exit_rcu+0x145/0x1c0 [ 44.170986][ C0] Preemption disabled at: [ 44.170986][ C0] [<0000000000000000>] 0x0 [ 44.170989][ C0] CPU: 0 UID: 0 PID: 1178 Comm: tls Tainted: G W 7.2.0-virtme #1 PREEMPT(full) [ 44.170991][ C0] Tainted: [W]=WARN [ 44.170992][ C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 44.170993][ C0] Call Trace: [ 44.170993][ C0] [ 44.170994][ C0] dump_stack_lvl+0x6f/0xa0 [ 44.170996][ C0] __might_resched.cold+0x1fe/0x2c1 [ 44.170999][ C0] ? perf_trace_sched_switch+0x7c0/0x7c0 [ 44.171002][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171003][ C0] __kmalloc_noprof+0x443/0x760 [ 44.171004][ C0] ? __rwlock_init+0x150/0x150 [ 44.171006][ C0] ? alloc_buf.isra.0+0x4b/0x260 [ 44.171008][ C0] ? do_raw_spin_unlock+0x59/0x250 [ 44.171010][ C0] alloc_buf.isra.0+0x4b/0x260 [ 44.171013][ C0] put_chars+0x1e1/0x2f0 [ 44.171014][ C0] ? __send_to_port+0x420/0x420 [ 44.171016][ C0] ? mark_lock+0x1d7/0xa00 [ 44.171018][ C0] hvc_console_print+0x292/0x780 [ 44.171021][ C0] ? hvc_write+0x3a0/0x3a0 [ 44.171023][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171024][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171025][ C0] console_emit_next_record+0x22f/0x4c0 [ 44.171027][ C0] ? devkmsg_read+0x4b0/0x4b0 [ 44.171029][ C0] ? console_flush_one_record+0x106/0x710 [ 44.171031][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171032][ C0] ? lock_acquire+0x13c/0x160 [ 44.171034][ C0] console_flush_one_record+0x46f/0x710 [ 44.171036][ C0] ? console_emit_next_record+0x4c0/0x4c0 [ 44.171038][ C0] ? __lock_acquire+0x518/0xc20 [ 44.171040][ C0] console_unlock+0xee/0x1f0 [ 44.171042][ C0] ? console_flush_one_record+0x710/0x710 [ 44.171044][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171045][ C0] ? lock_acquire+0xe0/0x160 [ 44.171047][ C0] ? __down_trylock_console_sem+0x5e/0xa0 [ 44.171048][ C0] ? vprintk_emit+0x320/0x3e0 [ 44.171050][ C0] vprintk_emit+0x37c/0x3e0 [ 44.171051][ C0] ? wake_up_klogd_work_func+0x90/0x90 [ 44.171053][ C0] ? clocksource_watchdog.part.0+0x450/0x540 [ 44.171054][ C0] _printk+0xc7/0x100 [ 44.171056][ C0] ? snapshot_read.cold+0x21/0x21 [ 44.171058][ C0] ? clocksource_watchdog.part.0+0x450/0x540 [ 44.171059][ C0] ? __lock_release.isra.0+0x69/0x1a0 [ 44.171062][ C0] clocksource_watchdog.part.0.cold+0x105/0x1dd [ 44.171063][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.171065][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.171066][ C0] call_timer_fn+0x160/0x4d0 [ 44.171068][ C0] ? sysvec_apic_timer_interrupt+0x4c/0xe0 [ 44.171069][ C0] ? detach_if_pending+0x1d0/0x1d0 [ 44.171072][ C0] ? _raw_spin_unlock_irq+0x28/0x50 [ 44.171074][ C0] __run_timers+0x68f/0xaa0 [ 44.171075][ C0] ? clocksource_watchdog.part.0+0x540/0x540 [ 44.171078][ C0] ? __bpf_trace_itimer_expire+0x10/0x10 [ 44.171079][ C0] ? __lock_acquire+0x518/0xc20 [ 44.171082][ C0] ? __rwlock_init+0x150/0x150 [ 44.171084][ C0] run_timer_softirq+0xf0/0x160 [ 44.171086][ C0] ? __run_timers+0xaa0/0xaa0 [ 44.171088][ C0] ? handle_softirqs+0x19c/0x900 [ 44.171089][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171090][ C0] handle_softirqs+0x1d3/0x900 [ 44.171092][ C0] ? __lock_release.isra.0+0x69/0x1a0 [ 44.171094][ C0] ? _local_bh_enable+0xc0/0xc0 [ 44.171096][ C0] __irq_exit_rcu+0x145/0x1c0 [ 44.171097][ C0] irq_exit_rcu+0xe/0x30 [ 44.171099][ C0] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 44.171100][ C0] [ 44.171101][ C0] [ 44.171101][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 44.171103][ C0] RIP: 0010:free_percpu+0x4/0x20 [ 44.171104][ C0] Code: e9 fe fa ff ff 4c 89 ef 89 04 24 e8 d6 60 1a 00 8b 04 24 e9 4d fc ff ff 0f 1f 00 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> 1f 44 00 00 48 85 ff 74 05 e9 7d f3 ff ff c3 90 66 66 2e 0f 1f [ 44.171106][ C0] RSP: 0018:ffa000000258fde0 EFLAGS: 00000246 [ 44.171107][ C0] RAX: dffffc0000000000 RBX: ff11000001074cc0 RCX: 0000000000000001 [ 44.171108][ C0] RDX: 1fe220000020e9e8 RSI: 0000000000000004 RDI: 00c0ffff2b621d10 [ 44.171108][ C0] RBP: ff11000001074f40 R08: ffffffff92aa4f2a R09: 1fe220000020e998 [ 44.171109][ C0] R10: ffe21c000020e999 R11: ffe21c000020e999 R12: ff1100000f3723c0 [ 44.171110][ C0] R13: ff1100000f3723c0 R14: ff11000001074cc0 R15: ff1100006c038fc0 [ 44.171111][ C0] ? finish_task_switch.isra.0+0x28a/0xa70 [ 44.171113][ C0] __mmdrop+0xbb/0x430 [ 44.171114][ C0] ? rcu_is_watching+0x16/0xd0 [ 44.171116][ C0] finish_task_switch.isra.0+0x6c4/0xa70 [ 44.171118][ C0] schedule_tail+0x13/0xe0 [ 44.171119][ C0] ret_from_fork+0x71/0x6b0 [ 44.171121][ C0] ? arch_exit_to_user_mode_prepare.isra.0+0x120/0x120 [ 44.171122][ C0] ? __switch_to+0x5a3/0xe00 [ 44.171124][ C0] ret_from_fork_asm+0x11/0x20 [ 44.171127][ C0]