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Date: Sun, 21 May 2023 08:03:41 +0200
From: Mike Galbraith <efault@....de>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: lkml <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: r8169: disable ASPM during NAPI poll locking changes --> BUG:
Invalid wait context --> PREEMPT_RT pain
Greetings,
The locks added to prep for $subject induce invalid context moaning due
to not being raw locks, but if I do that, the hold time does very bad
things to RT. Nouveau apparently didn't appreciate ftrace recording
the 160us latency hit all that much either, because my GUI ceased
responding, and I had to ssh in to find out what happened.
[ 783.226457] nouveau 0000:01:00.0: ce2: LAUNCHERR 0000000a [UNUSED_FIELD]
[ 787.530456] nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
[ 787.530501] nouveau 0000:01:00.0: fifo:000000:0002:[X[2677]] rc scheduled
[ 787.530504] nouveau 0000:01:00.0: fifo:000000: rc scheduled
[ 787.530516] nouveau 0000:01:00.0: fifo:000000:0002:0002:[X[2677]] errored - disabling channel
[ 787.530522] nouveau 0000:01:00.0: X[2677]: channel 2 killed!
# tracer: wakeup_RT
#
# wakeup_RT latency trace v1.1.5 on 6.4.0.gd635f6c-master-eevdf-rt
# --------------------------------------------------------------------
# latency: 160 us, #116/116, CPU#0 | (M:preempt_rt VP:0, KP:0, SP:0 HP:0 #P:8)
# -----------------
# | task: cyclictest-29050 (uid:0 nice:0 policy:1 rt_prio:99)
# -----------------
#
# _--------=> CPU#
# / _-------=> irqs-off/BH-disabled
# | / _------=> need-resched
# || / _-----=> need-resched-lazy
# ||| / _----=> hardirq/softirq
# |||| / _---=> preempt-depth
# ||||| / _--=> preempt-lazy-depth
# |||||| / _-=> migrate-disable
# ||||||| / delay
# cmd pid |||||||| time | caller
# \ / |||||||| \ | /
<idle>-0 0dn.h5.. 0us : 0:120:R + [000] 29050: 0:R cyclictest
<idle>-0 0dn.h5.. 1us : 0
<idle>-0 0dn.h4.. 1us : task_woken_rt <-ttwu_do_activate
<idle>-0 0dn.h4.. 1us : preempt_count_sub <-__raw_spin_unlock
<idle>-0 0dn.h3.. 1us : _raw_spin_unlock_irqrestore <-try_to_wake_up
<idle>-0 0dn.h3.. 1us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h2.. 2us : preempt_count_sub <-try_to_wake_up
<idle>-0 0dn.h1.. 2us : _raw_spin_lock_irq <-__hrtimer_run_queues
<idle>-0 0dn.h1.. 2us : preempt_count_add <-_raw_spin_lock_irq
<idle>-0 0dn.h2.. 2us : hrtimer_update_next_event <-hrtimer_interrupt
<idle>-0 0dn.h2.. 2us : __hrtimer_get_next_event <-hrtimer_update_next_event
<idle>-0 0dn.h2.. 2us : __hrtimer_next_event_base <-__hrtimer_get_next_event
<idle>-0 0dn.h2.. 3us : __hrtimer_get_next_event <-hrtimer_update_next_event
<idle>-0 0dn.h2.. 3us : __hrtimer_next_event_base <-hrtimer_update_next_event
<idle>-0 0dn.h2.. 3us : _raw_spin_unlock_irqrestore <-hrtimer_interrupt
<idle>-0 0dn.h2.. 3us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h1.. 3us : tick_program_event <-hrtimer_interrupt
<idle>-0 0dn.h1.. 3us : clockevents_program_event <-hrtimer_interrupt
<idle>-0 0dn.h1.. 3us : ktime_get <-clockevents_program_event
<idle>-0 0dn.h1.. 3us : lapic_next_deadline <-clockevents_program_event
<idle>-0 0dn.h1.. 4us : irq_exit_rcu <-sysvec_apic_timer_interrupt
<idle>-0 0dn..1.. 4us : idle_cpu <-irq_exit_rcu
<idle>-0 0dn..1.. 4us : irq_enter_rcu <-common_interrupt
<idle>-0 0dn.h1.. 4us : tick_irq_enter <-irq_enter_rcu
<idle>-0 0dn.h1.. 4us : tick_check_oneshot_broadcast_this_cpu <-tick_irq_enter
<idle>-0 0dn.h1.. 5us : __common_interrupt <-common_interrupt
<idle>-0 0dn.h1.. 5us : handle_edge_irq <-__common_interrupt
<idle>-0 0dn.h1.. 5us : _raw_spin_lock <-handle_edge_irq
<idle>-0 0dn.h1.. 5us : preempt_count_add <-_raw_spin_lock
<idle>-0 0dn.h2.. 5us : irq_may_run <-handle_edge_irq
<idle>-0 0dn.h2.. 5us : irq_chip_ack_parent <-handle_edge_irq
<idle>-0 0dn.h2.. 5us : apic_ack_irq <-handle_edge_irq
<idle>-0 0dn.h2.. 6us : handle_irq_event <-handle_edge_irq
<idle>-0 0dn.h2.. 6us : preempt_count_sub <-handle_irq_event
<idle>-0 0dn.h1.. 6us : handle_irq_event_percpu <-handle_irq_event
<idle>-0 0dn.h1.. 6us : __handle_irq_event_percpu <-handle_irq_event_percpu
<idle>-0 0dn.h1.. 6us+: rtl8169_interrupt <-__handle_irq_event_percpu
<idle>-0 0dn.h1.. 81us : napi_schedule_prep <-rtl8169_interrupt
<idle>-0 0dn.h1.. 81us : rtl_unlock_config_regs <-rtl8169_interrupt
<idle>-0 0dn.h1.. 81us : _raw_spin_lock_irqsave <-rtl_unlock_config_regs
<idle>-0 0dn.h1.. 81us : preempt_count_add <-_raw_spin_lock_irqsave
<idle>-0 0dn.h2.. 82us : _raw_spin_unlock_irqrestore <-rtl8169_interrupt
<idle>-0 0dn.h2.. 82us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h1.. 82us : rtl_hw_aspm_clkreq_enable <-rtl8169_interrupt
<idle>-0 0dn.h1.. 82us : rtl_mod_config2 <-rtl_hw_aspm_clkreq_enable
<idle>-0 0dn.h1.. 82us : _raw_spin_lock_irqsave <-rtl_mod_config2
<idle>-0 0dn.h1.. 82us+: preempt_count_add <-_raw_spin_lock_irqsave
<idle>-0 0dn.h2.. 110us : _raw_spin_unlock_irqrestore <-rtl_hw_aspm_clkreq_enable
<idle>-0 0dn.h2.. 110us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h1.. 110us : rtl_mod_config5 <-rtl8169_interrupt
<idle>-0 0dn.h1.. 110us : _raw_spin_lock_irqsave <-rtl_mod_config5
<idle>-0 0dn.h1.. 110us+: preempt_count_add <-_raw_spin_lock_irqsave
<idle>-0 0dn.h2.. 149us : _raw_spin_unlock_irqrestore <-rtl8169_interrupt
<idle>-0 0dn.h2.. 150us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h1.. 150us : rtl_lock_config_regs <-rtl8169_interrupt
<idle>-0 0dn.h1.. 150us : _raw_spin_lock_irqsave <-rtl_lock_config_regs
<idle>-0 0dn.h1.. 150us : preempt_count_add <-_raw_spin_lock_irqsave
<idle>-0 0dn.h2.. 150us : _raw_spin_unlock_irqrestore <-rtl8169_interrupt
<idle>-0 0dn.h2.. 150us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn.h1.. 151us : __napi_schedule <-rtl8169_interrupt
<idle>-0 0dn.h1.. 151us : __raise_softirq_irqoff <-__napi_schedule
<idle>-0 0dn.h1.. 151us : add_interrupt_randomness <-handle_irq_event_percpu
<idle>-0 0dn.h1.. 151us : fast_mix <-add_interrupt_randomness
<idle>-0 0dn.h1.. 151us : note_interrupt <-handle_irq_event_percpu
<idle>-0 0dn.h1.. 151us : _raw_spin_lock <-handle_irq_event
<idle>-0 0dn.h1.. 152us : preempt_count_add <-_raw_spin_lock
<idle>-0 0dn.h2.. 152us : preempt_count_sub <-handle_edge_irq
<idle>-0 0dn.h1.. 152us : irq_exit_rcu <-common_interrupt
<idle>-0 0dn..1.. 152us : wakeup_softirqd <-irq_exit_rcu
<idle>-0 0dn..1.. 152us : wake_up_process <-irq_exit_rcu
<idle>-0 0dn..1.. 152us : try_to_wake_up <-irq_exit_rcu
<idle>-0 0dn..1.. 153us : preempt_count_add <-try_to_wake_up
<idle>-0 0dn..2.. 153us : _raw_spin_lock_irqsave <-try_to_wake_up
<idle>-0 0dn..2.. 153us : preempt_count_add <-_raw_spin_lock_irqsave
<idle>-0 0dn..3.. 153us : kthread_is_per_cpu <-is_cpu_allowed
<idle>-0 0dn..3.. 153us : ttwu_queue_wakelist <-try_to_wake_up
<idle>-0 0dn..3.. 153us : preempt_count_add <-try_to_wake_up
<idle>-0 0dn..4.. 154us : _raw_spin_lock <-try_to_wake_up
<idle>-0 0dn..4.. 154us : preempt_count_add <-_raw_spin_lock
<idle>-0 0dn..5.. 154us : preempt_count_sub <-try_to_wake_up
<idle>-0 0dn..4.. 154us : update_rq_clock <-try_to_wake_up
<idle>-0 0dn..4.. 155us : update_rq_clock.part.110 <-try_to_wake_up
<idle>-0 0dn..4.. 155us : ttwu_do_activate <-try_to_wake_up
<idle>-0 0dn..4.. 155us : activate_task <-ttwu_do_activate
<idle>-0 0dn..4.. 155us : enqueue_task_fair <-activate_task
<idle>-0 0dn..4.. 155us : update_curr <-enqueue_task_fair
<idle>-0 0dn..4.. 155us : __update_load_avg_se <-enqueue_task_fair
<idle>-0 0dn..4.. 156us : __update_load_avg_cfs_rq <-enqueue_task_fair
<idle>-0 0dn..4.. 156us : place_entity <-enqueue_task_fair
<idle>-0 0dn..4.. 156us : avg_vruntime <-place_entity
<idle>-0 0dn..4.. 156us : __enqueue_entity <-enqueue_task_fair
<idle>-0 0dn..4.. 156us : hrtick_update <-activate_task
<idle>-0 0dn..4.. 156us : check_preempt_curr <-ttwu_do_activate
<idle>-0 0dn..4.. 157us : resched_curr <-check_preempt_curr
<idle>-0 0dn..5.. 157us : __traceiter_sched_wakeup <-ttwu_do_activate
<idle>-0 0dn..4.. 157us : preempt_count_sub <-__raw_spin_unlock
<idle>-0 0dn..3.. 157us : _raw_spin_unlock_irqrestore <-try_to_wake_up
<idle>-0 0dn..3.. 157us : preempt_count_sub <-_raw_spin_unlock_irqrestore
<idle>-0 0dn..2.. 157us : preempt_count_sub <-try_to_wake_up
<idle>-0 0dn..1.. 158us : idle_cpu <-irq_exit_rcu
<idle>-0 0dn..1.. 158us : rcu_note_context_switch <-__schedule
<idle>-0 0dn..1.. 158us : rcu_qs <-rcu_note_context_switch
<idle>-0 0dn..1.. 158us : preempt_count_add <-__schedule
<idle>-0 0dn..2.. 158us : _raw_spin_lock <-__schedule
<idle>-0 0dn..2.. 159us : preempt_count_add <-_raw_spin_lock
<idle>-0 0dn..3.. 159us : preempt_count_sub <-__schedule
<idle>-0 0dn..2.. 159us : update_rq_clock <-__schedule
<idle>-0 0dn..2.. 159us : put_prev_task_idle <-__schedule
<idle>-0 0dn..2.. 159us : pick_next_task_stop <-__schedule
<idle>-0 0dn..2.. 159us : pick_next_task_dl <-__schedule
<idle>-0 0dn..2.. 159us : pick_next_task_rt <-__schedule
<idle>-0 0dn..2.. 160us : pick_next_rt_entity <-pick_next_task_rt
<idle>-0 0dn..2.. 160us : update_rt_rq_load_avg <-pick_next_task_rt
<idle>-0 0d...3.. 160us : __traceiter_sched_switch <-__schedule
<idle>-0 0d...3.. 160us : __traceiter_sched_switch
<idle>-0 0d...3.. 160us : 0:120:R ==> [000] 29050: 0:R cyclictest
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