{ "generated_local": "2026-09-10T19:47:54.178049-07:00", "full_record": { "window": { "started_local": "2026-09-10T19:33:15.523367-07:00", "started_epoch_ns": 1789093995523367000, "started_monotonic_ns": 3581002437871750, "device": "K-Mix", "input_channels": [ 3, 4 ], "rate": 48000, "bits": 24, "maximum_seconds": 1200, "command": [ "/opt/homebrew/bin/sox", "--buffer", "131072", "-q", "-t", "coreaudio", "-r", "48000", "-c", "8", "K-Mix", "-b", "24", "/private/tmp/smartgrid-system-trace-r2-20260910/audio.wav", "remix", "3", "4", "trim", "0", "1200" ], "wrapper_pid": 40020, "source": "Focused native scheduler/workgroup/USB traces, nominal then induced Serious. Same normal DSP/UI/MIDI JUCE8.0.15 build,48k/512,PD connected. Continuous K-Mix3/4 audio includes startup, trace setup/draining and thermal transition. See events and phase trace timestamps for exposure.", "status": "recorded", "sox_pid": 40027, "system_log_pid": 40025, "keep_awake_pid": 40026, "returncode": 0, "ended_local": "2026-09-10T19:40:04.611367-07:00", "ended_epoch_ns": 1789094404611367000, "wrapper_ended_local": "2026-09-10T19:40:04.950268-07:00", "wrapper_started_epoch_ns": 1789093995523387000, "wrapper_ended_epoch_ns": 1789094404950342000, "measured_wav_seconds": 409.088, "timing_note": "Window local and epoch boundaries are derived from the same ISO timestamps at microsecond precision. End is nominal recorder start plus exact WAVE data-frame duration. Original separately sampled wrapper epoch timestamps and completion time are retained in wrapper_* fields and the raw recorder JSON. 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"median_width_ms": 0.5625, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 310, "end_seconds": 320, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 320, "end_seconds": 330, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 330, "end_seconds": 340, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 340, "end_seconds": 350, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 350, "end_seconds": 360, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 360, "end_seconds": 370, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 370, "end_seconds": 380, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 380, "end_seconds": 390, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 390, "end_seconds": 400, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] }, { "start_seconds": 400, "end_seconds": 409.088, "holes": 0, "holes_per_second": 0.0, "flat_fraction": 0, "median_width_ms": null, "onset_spacing_ms_p10_p50_p90": [] } ], "method": "Consecutive 1-second bins with at least 10 short flat candidates form dense episodes. Same criterion as the earlier UI comparison. Natural quiet/smooth music can produce candidates; inspect waveform and cadence to attribute periodic blanking. Analog settling affects widths. No claim against subtle clicks." }, "all_processing_overruns": [ { "cb": 1.0, "t_us": 187464649046.0, "gap_us": 0.0, "prev_budget_us": 0.0, "dsp_us": 17262.0, "n": 470.0, "sr": 48000.0, "xr": 0.0, "thermal": -1.0, "lp": 0.0, "muted": 0.0, "epoch": 1789094003.168776, "at": "2026-09-10T19:33:23.168776-07:00" } ], "sequence_holes": 0, "logger_misses": [], "midi_enabled_running": true, "drift_events": [ { "epoch": 1789093995.570897, "at": "2026-09-10 19:33:15.570897-0700", "message": " [0x98b]:AUAAudioDevice_updateTimeStamp ioDriftNS 1725667 at sampleTime 8654625", "thread_id": 1405265 }, { "epoch": 1789094073.386971, "at": "2026-09-10 19:34:33.386971-0700", "message": " [0x98b]:AUAAudioDevice_updateTimeStamp ioDriftNS 2020791 at sampleTime 3372000", "thread_id": 1405169 }, { "epoch": 1789094073.635026, "at": "2026-09-10 19:34:33.635026-0700", "message": " [0x98b]:AUAAudioDevice_updateTimeStamp ioDriftNS 2020792 at sampleTime 3384000", "thread_id": 1405169 }, { "epoch": 1789094286.131936, 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2.136252833333333, "5": 0.8029529999999999, "6": 0.6521496249999998, "7": 0.3617573333333333 } } ] } ], "captured_fault": { "usb_error_ticks": 4503839060130, "usb_error_t_us": 187659960838.75, "usb_status": "0xe00002ed", "device_endpoint_encoded": "0x48200", "unified_log_match": { "epoch": 1789094198.480863, "at": "2026-09-10 19:36:38.480863-0700", "message": "AppleUSBIORequest: AppleUSBIORequest::complete: device 4 (MAYA44 USB+@00140000) endpoint 0x82: status 0xe00002ed (transaction error)", "thread_id": 1362566 }, "previous_callback": { "cb": 18291.0, "t_us": 187659951407.0, "gap_us": 10665.0, "prev_budget_us": 10667.0, "dsp_us": 4847.0, "n": 512.0, "sr": 48000.0, "xr": 1.0, "thermal": 0.0, "lp": 0.0, "muted": 0.0, "epoch": 1789094198.4712257, "at": "2026-09-10T19:36:38.471226-07:00" }, "resumed_callback": { "cb": 18292.0, "t_us": 187660181032.0, "gap_us": 229625.0, "prev_budget_us": 10667.0, "dsp_us": 3806.0, "n": 512.0, "sr": 48000.0, "xr": 2.0, "thermal": 0.0, "lp": 0.0, "muted": 0.0, "epoch": 1789094198.7008035, "at": "2026-09-10T19:36:38.700804-07:00" }, "previous_processing_end_before_usb_ms": 4.58475, "audio_last_cpu_exit_before_usb_ms": 4.579541666666666, "audio_next_runnable_after_usb_ms": 220.1872083333333, "audio_next_scheduled_after_usb_ms": 220.1895833333333, "resume_ready_delay_us": 2.375, "callback_gap_ms": 229.625, "message_scheduled_ms_while_audio_waiting": 40.2745, "midi_scheduled_ms_while_audio_waiting": 4.21025, "waker_before_fault": "audiomxd audio IO: VAD [vdef] AggDev392, thread1407797", "state_evidence": "MACH_BLOCK then MACH_STKHANDOFF, dispatch stateTH_WAIT=1; no audioMKRUNNABLE until+220.187ms.", "usb_kernel_threads": [ { "tid": 1565, "thread": "AppleUSB20XHCIARMPort@00100000", "wakeups_prior100ms_to_after2ms": 0, "wake_to_in_us_p50_p99_max": [], "last_wakes": [] }, { "tid": 1362566, "thread": "AppleUSB20HubPort@00140000", "wakeups_prior100ms_to_after2ms": 22, "wake_to_in_us_p50_p99_max": [ 11.291666666666666, 12.5725, 12.625 ], "last_wakes": [ { "relative_to_error_ms": -24.069375, "ready_us": 11.833333333333332 }, { "relative_to_error_ms": -16.067666666666668, "ready_us": 11.0 }, { "relative_to_error_ms": -13.833958333333332, "ready_us": 11.041666666666666 }, { "relative_to_error_ms": -8.063333333333333, "ready_us": 11.833333333333332 }, { "relative_to_error_ms": -0.06908333333333333, "ready_us": 11.541666666666666 }, { "relative_to_error_ms": 1.4524583333333332, "ready_us": 11.666666666666666 }, { "relative_to_error_ms": 1.6247083333333332, "ready_us": 9.166666666666666 }, { "relative_to_error_ms": 1.6737916666666666, "ready_us": 7.375 } ] }, { "tid": 1559, "thread": "AppleT8122USBXHCI@00000000", "wakeups_prior100ms_to_after2ms": 20, "wake_to_in_us_p50_p99_max": [ 7.145833333333333, 12.775833333333333, 12.791666666666666 ], "last_wakes": [ { "relative_to_error_ms": -32.10795833333333, "ready_us": 7.375 }, { "relative_to_error_ms": -29.860208333333333, "ready_us": 6.333333333333333 }, { "relative_to_error_ms": -24.1165, "ready_us": 10.5 }, { "relative_to_error_ms": -16.104916666666664, "ready_us": 6.75 }, { "relative_to_error_ms": -13.858083333333331, "ready_us": 6.208333333333333 }, { "relative_to_error_ms": -8.111291666666666, "ready_us": 10.833333333333332 }, { "relative_to_error_ms": -0.107625, "ready_us": 6.708333333333333 }, { "relative_to_error_ms": 1.3633333333333333, "ready_us": 12.083333333333332 } ] } ] }, "limits": [ "Four short native windows, same profiler configuration and verified thermal states; not a reliable failure-rate estimate.", "Profiler streaming materially adds workload. The first long attempt failed its transfer-coverage gate and is preserved separately.", "Native scheduler and USB-class trace is not the full Instruments Audio System Trace track set.", "Scheduled intervals include any interrupt time. No CPU-frequency, peripheral electrical telemetry or returned native output samples were captured.", "Captured failure rejects a simple delayed-runnable-app-audio explanation for this episode; workload may still influence driver, clock or electrical state.", "Serious did not materially change measured UI/MIDI/I/O-worker wake activity or priority in these windows. Other OS policies remain unmeasured." ] }