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    SubjectRe: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4]
    On Fri, 29 Oct 2004 23:25:45 +0200
    Ingo Molnar <mingo@elte.hu> wrote:

    > > will do so. btw: i think i'm a bit confused right now. What debugging
    > > features should i have enabled for this test?
    >
    > this particular one (atomicity-checking) is always-enabled if you have
    > the -RT patch applied (it's a really cheap check).
    >
    > for the 'application-triggered tracing' facility we talked about earlier
    > is only active if LATENCY_TRACING is enabled. In that case to turn the
    > tracer on, call:
    [snip]

    Ok,

    .config attached,

    running the patched jackd -R -P 60 -d alsa -p64 for a bit and provoking
    xruns via window wiggling :)

    mango:~# cat /proc/sys/kernel/trace_enabled
    2
    mango:~# cat /proc/sys/kernel/preempt_max_latency
    75
    mango:~# cat /proc/sys/kernel/preempt_thresh
    0

    mango:~# cat /proc/latency_trace
    preemption latency trace v1.0.7 on 2.6.9-mm1-RT-V0.5.14-rt
    -------------------------------------------------------
    latency: 75 us, entries: 54 (54) | [VP:0 KP:1 SP:1 HP:1 #CPUS:1]
    -----------------
    | task: jackd/1083, uid:1000 nice:0 policy:1 rt_prio:60
    -----------------
    => started at: try_to_wake_up+0x5a/0x110 <c01151ca>
    => ended at: finish_task_switch+0x31/0xc0 <c0115691>
    =======>
    834 80000000 0.000ms (+0.000ms): (39) ((115))
    834 80000000 0.000ms (+0.000ms): (1083) ((834))
    834 80000000 0.000ms (+0.000ms): preempt_schedule (try_to_wake_up)
    834 80000000 0.000ms (+0.000ms): preempt_schedule (__up_write)
    834 00000000 0.000ms (+0.000ms): preempt_schedule (up_write_mutex)
    834 80000000 0.000ms (+0.000ms): __schedule (preempt_schedule)
    834 80000000 0.000ms (+0.000ms): profile_hit (__schedule)
    834 80000000 0.000ms (+0.000ms): sched_clock (__schedule)
    1083 80000000 0.001ms (+0.000ms): __switch_to (__schedule)
    1083 80000000 0.001ms (+0.000ms): (834) ((1083))
    1083 80000000 0.001ms (+0.000ms): (115) ((39))
    1083 80000000 0.002ms (+0.000ms): finish_task_switch (__schedule)
    1083 80000000 0.002ms (+0.000ms): trace_stop_sched_switched (finish_task_switch)
    1083 80000000 0.002ms (+0.000ms): (1083) ((39))
    1083 00000000 0.003ms (+0.000ms): _mutex_unlock (kfree)
    1083 00000000 0.003ms (+0.000ms): up_mutex (kfree)
    1083 00000000 0.003ms (+0.000ms): up_write_mutex (kfree)
    1083 00000000 0.003ms (+0.000ms): __up_write (up_write_mutex)
    1083 00000000 0.003ms (+0.000ms): poll_freewait (sys_poll)
    1083 00000000 0.003ms (+0.000ms): remove_wait_queue (poll_freewait)
    1083 00000000 0.003ms (+0.000ms): _mutex_lock_irqsave (remove_wait_queue)
    1083 00000000 0.003ms (+0.000ms): __mutex_lock (_mutex_lock_irqsave)
    1083 00000000 0.003ms (+0.000ms): __might_sleep (__mutex_lock)
    1083 00000000 0.004ms (+0.000ms): down_mutex (__mutex_lock)
    1083 00000000 0.004ms (+0.000ms): down_write_mutex (__mutex_lock)
    1083 00000000 0.004ms (+0.000ms): __might_sleep (down_write_mutex)
    1083 00000000 0.004ms (+0.000ms): _mutex_unlock_irqrestore (remove_wait_queue)
    1083 00000000 0.004ms (+0.000ms): up_mutex (remove_wait_queue)
    1083 00000000 0.004ms (+0.000ms): up_write_mutex (remove_wait_queue)
    1083 00000000 0.004ms (+0.000ms): __up_write (up_write_mutex)
    1083 00000000 0.004ms (+0.000ms): fput (poll_freewait)
    1083 00000000 0.005ms (+0.000ms): free_pages (poll_freewait)
    1083 00000000 0.005ms (+0.000ms): __free_pages (poll_freewait)
    1083 00000000 0.005ms (+0.000ms): free_hot_page (poll_freewait)
    1083 00000000 0.006ms (+0.000ms): __free_pages_ok (free_hot_page)
    1083 00000000 0.006ms (+0.000ms): free_pages_bulk (__free_pages_ok)
    1083 00000000 0.006ms (+0.000ms): _mutex_lock_irqsave (free_pages_bulk)
    1083 00000000 0.006ms (+0.000ms): __mutex_lock (_mutex_lock_irqsave)
    1083 00000000 0.007ms (+0.000ms): __might_sleep (__mutex_lock)
    1083 00000000 0.007ms (+0.000ms): down_mutex (__mutex_lock)
    1083 00000000 0.007ms (+0.000ms): down_write_mutex (__mutex_lock)
    1083 00000000 0.007ms (+0.000ms): __might_sleep (down_write_mutex)
    1083 00000000 0.007ms (+0.000ms): bad_range (free_pages_bulk)
    1083 00000000 0.007ms (+0.000ms): bad_range (free_pages_bulk)
    1083 00000000 0.008ms (+0.000ms): _mutex_unlock_irqrestore (free_pages_bulk)
    1083 00000000 0.008ms (+0.000ms): up_mutex (free_pages_bulk)
    1083 00000000 0.008ms (+0.000ms): up_write_mutex (free_pages_bulk)
    1083 00000000 0.008ms (+0.004ms): __up_write (up_write_mutex)
    1083 00000000 0.013ms (+0.000ms): sys_gettimeofday (syscall_call)
    1083 00000000 0.013ms (+0.000ms): user_trace_stop (sys_gettimeofday)
    1083 80000000 0.013ms (+0.000ms): user_trace_stop (sys_gettimeofday)
    1083 80000000 0.013ms (+0.000ms): update_max_trace (user_trace_stop)
    1083 80000000 0.014ms (+0.000ms): _mmx_memcpy (update_max_trace)
    1083 80000000 0.014ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)



    mango:~# chrt -p `pidof "IRQ 3"`
    pid 118's current scheduling policy: SCHED_FIFO
    pid 118's current scheduling priority: 99

    mango:~# ps aux|grep jackd
    tapas 1080 4.2 3.6 28244 28220 pts/1 SLl+ 00:22 0:18 jackd -R -P 60 -d alsa -p 64
    mango:~# chrt -p 1080
    pid 1080's current scheduling policy: SCHED_OTHER
    pid 1080's current scheduling priority: 0
    mango:~# chrt -p 1081
    pid 1081's current scheduling policy: SCHED_OTHER
    pid 1081's current scheduling priority: 0
    mango:~# chrt -p 1082
    pid 1082's current scheduling policy: SCHED_FIFO
    pid 1082's current scheduling priority: 70
    mango:~# chrt -p 1083
    pid 1083's current scheduling policy: SCHED_FIFO
    pid 1083's current scheduling priority: 60


    and here's some syslog stuff:

    Oct 30 00:20:32 mango kernel: Realtime LSM initialized (group 1002, mlock=1)
    Oct 30 00:20:35 mango kernel: IRQ#3 thread RT prio: 43.
    Oct 30 00:20:38 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:20:38 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:20:38 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:20:38 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:20:38 mango kernel: ---------------------------
    Oct 30 00:20:38 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:20:38 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:20:38 mango kernel: ----------------------------------------
    Oct 30 00:20:38 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:20:38 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:20:38 mango kernel:
    Oct 30 00:20:47 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:20:47 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:20:47 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:20:47 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:20:47 mango kernel: ---------------------------
    Oct 30 00:20:47 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:20:47 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:20:47 mango kernel: ----------------------------------------
    Oct 30 00:20:47 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:20:47 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:20:47 mango kernel:
    Oct 30 00:20:51 mango kernel: (IRQ 3/118/CPU#0): new 4 us maximum-latency wakeup.
    Oct 30 00:20:51 mango kernel: (bash/867/CPU#0): new 6 us maximum-latency wakeup.
    Oct 30 00:20:52 mango kernel: (bash/1035/CPU#0): new 7 us maximum-latency wakeup.
    Oct 30 00:20:52 mango kernel: (ksoftirqd/0/2/CPU#0): new 8 us maximum-latency wakeup.
    Oct 30 00:20:52 mango kernel: (ksoftirqd/0/2/CPU#0): new 13 us maximum-latency wakeup.
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: (IRQ 12/15/CPU#0): new 19 us maximum-latency wakeup.
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:11 mango kernel: (IRQ 12/15/CPU#0): new 75 us maximum-latency wakeup.
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:11 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:11 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:11 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:11 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:11 mango kernel: ---------------------------
    Oct 30 00:21:11 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:11 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:11 mango kernel: ----------------------------------------
    Oct 30 00:21:11 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:11 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:11 mango kernel:
    Oct 30 00:21:12 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:12 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:12 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:12 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:12 mango kernel: ---------------------------
    Oct 30 00:21:12 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:12 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:12 mango kernel: ----------------------------------------
    Oct 30 00:21:12 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:12 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:12 mango kernel:
    Oct 30 00:21:13 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:13 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:13 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:13 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:13 mango kernel: ---------------------------
    Oct 30 00:21:13 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:13 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:13 mango kernel: ----------------------------------------
    Oct 30 00:21:13 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:13 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:13 mango kernel:
    Oct 30 00:21:31 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:31 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:31 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:31 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:31 mango kernel: ---------------------------
    Oct 30 00:21:31 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:31 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:31 mango kernel: ----------------------------------------
    Oct 30 00:21:31 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:31 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:31 mango kernel:
    Oct 30 00:21:32 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:32 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:32 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:32 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:32 mango kernel: ---------------------------
    Oct 30 00:21:32 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:32 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:32 mango kernel: ----------------------------------------
    Oct 30 00:21:32 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:32 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:32 mango kernel:
    Oct 30 00:21:32 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:32 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:32 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:32 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:32 mango kernel: ---------------------------
    Oct 30 00:21:32 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:32 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:32 mango kernel: ----------------------------------------
    Oct 30 00:21:32 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:32 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:32 mango kernel:
    Oct 30 00:21:32 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:32 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:32 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:32 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:32 mango kernel: ---------------------------
    Oct 30 00:21:32 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:32 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:32 mango kernel: ----------------------------------------
    Oct 30 00:21:32 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:32 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:32 mango kernel:
    Oct 30 00:21:34 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:34 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:34 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:34 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:34 mango kernel: ---------------------------
    Oct 30 00:21:34 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:34 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:34 mango kernel: ----------------------------------------
    Oct 30 00:21:34 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:34 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:34 mango kernel:
    Oct 30 00:21:35 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:35 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:35 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:35 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:35 mango kernel: ---------------------------
    Oct 30 00:21:35 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:35 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:35 mango kernel: ----------------------------------------
    Oct 30 00:21:35 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:35 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:35 mango kernel:
    Oct 30 00:21:37 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:21:37 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:21:37 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:21:37 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:21:37 mango kernel: ---------------------------
    Oct 30 00:21:37 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:21:37 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:21:37 mango kernel: ----------------------------------------
    Oct 30 00:21:37 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:21:37 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:21:37 mango kernel:
    Oct 30 00:22:09 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:22:09 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:22:09 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:22:09 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:22:09 mango kernel: ---------------------------
    Oct 30 00:22:09 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:22:09 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:22:09 mango kernel: ----------------------------------------
    Oct 30 00:22:09 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:22:09 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:22:09 mango kernel:
    Oct 30 00:22:10 mango kernel: jackd:1019 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:22:10 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:22:10 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:22:10 mango kernel: [kernel_config_data+5091/6569] io_schedule+0x13/0x20 (8)
    Oct 30 00:22:10 mango kernel: [do_hardirq+104/304] sync_page+0x38/0x50 (12)
    Oct 30 00:22:10 mango kernel: [kernel_config_data+5981/6569] __wait_on_bit_lock+0x5d/0x70 (32)
    Oct 30 00:22:10 mango kernel: [init_irq_proc+137/176] __lock_page+0x89/0xa0 (92)
    Oct 30 00:22:10 mango kernel: [__generic_file_aio_read+402/544] filemap_nopage+0x2b2/0x3e0 (60)
    Oct 30 00:22:10 mango kernel: [do_no_page+74/848] do_no_page+0xba/0x390 (68)
    Oct 30 00:22:10 mango kernel: [handle_mm_fault+207/416] handle_mm_fault+0xef/0x180 (48)
    Oct 30 00:22:10 mango kernel: [get_user_pages+169/912] get_user_pages+0x139/0x380 (60)
    Oct 30 00:22:10 mango kernel: [make_pages_present+108/192] make_pages_present+0x9c/0x110 (56)
    Oct 30 00:22:10 mango kernel: [do_mmap_pgoff+699/1808] do_mmap_pgoff+0x47b/0x700 (88)
    Oct 30 00:22:10 mango kernel: [old_mmap+149/304] old_mmap+0xc5/0xf0 (96)
    Oct 30 00:22:10 mango kernel: [irq_entries_start+3/128] syscall_call+0x7/0xb (-8124)
    Oct 30 00:22:10 mango kernel: ---------------------------
    Oct 30 00:22:10 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:22:10 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:22:10 mango kernel: ----------------------------------------
    Oct 30 00:22:10 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:22:10 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:22:10 mango kernel:
    Oct 30 00:24:40 mango kernel: jackd:1083 userspace BUG: scheduling in user-atomic context!
    Oct 30 00:24:40 mango kernel: [show_registers+99/464] dump_stack+0x23/0x30 (20)
    Oct 30 00:24:40 mango kernel: [kernel_config_data+2090/6569] schedule+0x7a/0x120 (36)
    Oct 30 00:24:40 mango kernel: [irq_entries_start+43/128] work_resched+0x6/0x17 (-8124)
    Oct 30 00:24:40 mango kernel: ---------------------------
    Oct 30 00:24:40 mango kernel: | preempt count: 00000001 ]
    Oct 30 00:24:40 mango kernel: | 1-level deep critical section nesting:
    Oct 30 00:24:40 mango kernel: ----------------------------------------
    Oct 30 00:24:40 mango kernel: .. [l_show+173/272] .... print_traces+0x1d/0x90
    Oct 30 00:24:40 mango kernel: .....[show_registers+99/464] .. ( <= dump_stack+0x23/0x30)
    Oct 30 00:24:40 mango kernel:
    Oct 30 00:28:29 mango kernel: (IRQ 3/118/CPU#0): new 205 us maximum-latency wakeup.
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