Error opening trace log.

[Jon Lui]

I am trying to open my trace file and i am constantly getting this eror. I built a C wrapper around perfetto for me to use in my C application.

UI: https://ui.perfetto.dev/v49.0-b2340d0ca RuntimeError: abort(undefined) at Error @ perfetto::trace_processor::SystemInfoTracker::SetKernelVersion(perfetto::base::StringView, perfetto::base::StringView) - jsStackTrace (engine_bundle.js:1917:16) - stackTrace (engine_bundle.js:1932:13) - abort (engine_bundle.js:1776:45) - _abort (engine_bundle.js:5293:4) - std::__2::__throw_bad_function_call() (wasm://wasm/027944ce:wasm-function[534]:0x385f5) - perfetto::trace_processor::SystemInfoTracker::SetKernelVersion(perfetto::base::StringView, perfetto::base::StringView) (wasm://wasm/027944ce:wasm-function[1971]:0x181e83) - perfetto::trace_processor::SystemProbesParser::ParseSystemInfo(protozero::ConstBytes) (wasm://wasm/027944ce:wasm-function[4727]:0x31430f) - perfetto::trace_processor::SystemProbesModule::TokenizePacket(perfetto::protos::pbzero::TracePacket_Decoder const&, perfetto::trace_processor::TraceBlobView*, long long, perfetto::trace_processor::RefPtr<perfetto::trace_processor::PacketSequenceStateGeneration>, unsigned int) (wasm://wasm/027944ce:wasm-function[4712]:0x30d1f1) - perfetto::trace_processor::ProtoTraceReader::ParsePacket(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3030]:0x219aab) - perfetto::trace_processor::ProtoTraceReader::Parse(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3029]:0x2182e7) - jsStackTrace (engine_bundle.js:1917:16) - stackTrace (engine_bundle.js:1932:13) - abort (engine_bundle.js:1776:45) - _abort (engine_bundle.js:5293:4) - std::__2::__throw_bad_function_call() (wasm://wasm/027944ce:wasm-function[534]:0x385f5) - perfetto::trace_processor::SystemInfoTracker::SetKernelVersion(perfetto::base::StringView, perfetto::base::StringView) (wasm://wasm/027944ce:wasm-function[1971]:0x181e83) - perfetto::trace_processor::SystemProbesParser::ParseSystemInfo(protozero::ConstBytes) (wasm://wasm/027944ce:wasm-function[4727]:0x31430f) - perfetto::trace_processor::SystemProbesModule::TokenizePacket(perfetto::protos::pbzero::TracePacket_Decoder const&, perfetto::trace_processor::TraceBlobView*, long long, perfetto::trace_processor::RefPtr<perfetto::trace_processor::PacketSequenceStateGeneration>, unsigned int) (wasm://wasm/027944ce:wasm-function[4712]:0x30d1f1) - perfetto::trace_processor::ProtoTraceReader::ParsePacket(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3030]:0x219aab) - perfetto::trace_processor::ProtoTraceReader::Parse(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3029]:0x2182e7) - abort (engine_bundle.js:1778:12) - _abort (engine_bundle.js:5293:4) - std::__2::__throw_bad_function_call() (wasm://wasm/027944ce:wasm-function[534]:0x385f5) - perfetto::trace_processor::SystemInfoTracker::SetKernelVersion(perfetto::base::StringView, perfetto::base::StringView) (wasm://wasm/027944ce:wasm-function[1971]:0x181e83) - perfetto::trace_processor::SystemProbesParser::ParseSystemInfo(protozero::ConstBytes) (wasm://wasm/027944ce:wasm-function[4727]:0x31430f) - perfetto::trace_processor::SystemProbesModule::TokenizePacket(perfetto::protos::pbzero::TracePacket_Decoder const&, perfetto::trace_processor::TraceBlobView*, long long, perfetto::trace_processor::RefPtr<perfetto::trace_processor::PacketSequenceStateGeneration>, unsigned int) (wasm://wasm/027944ce:wasm-function[4712]:0x30d1f1) - perfetto::trace_processor::ProtoTraceReader::ParsePacket(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3030]:0x219aab) - perfetto::trace_processor::ProtoTraceReader::Parse(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[3029]:0x2182e7) - perfetto::trace_processor::ForwardingTraceParser::Parse(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[1537]:0x156472) - perfetto::trace_processor::TraceProcessorStorageImpl::Parse(perfetto::trace_processor::TraceBlobView) (wasm://wasm/027944ce:wasm-function[1641]:0x15fc7c) - (stderr: ) Trace: not available (No trace loaded). Provide repro steps. UA: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 Referrer:

[Lalit Maganti]

This was fixed recently in https://cs.android.com/android/_/android/platform/external/perfetto/+/5c17fc6e089cecec6bd75073875f57c99dcd2f02

Should be released in the next version of the UI. You can switch to canary/autopush UI which should already have the fix 

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[Jon Lui]

Thanks! I just tried and it works. Do you know why there's an empty space on the left most?

[Lalit Maganti]

Usually there is some data source emitting information before scheduling was enabled

It can happen if you have multiple buffers and the data rate of the other data source is lower than ftrace (which is what provides scheduling info). 

To view this discussion visit https://groups.google.com/d/msgid/perfetto-dev/816793a4-e7bd-470a-92e2-a5e5f525ddddn%40googlegroups.com.

[Jon Lui]

Sorry, false alarm. The web UI opened a cached trace. I am using canary and i can still see the issue.

[Jon Lui]

Works on Autopush UI.

[Lalit Maganti]

Try autopush. Canary may also not have the fix. Go to "flags" and change release to autopush. 

To view this discussion visit https://groups.google.com/d/msgid/perfetto-dev/86811c92-61ab-4895-b6c0-04763ce56dbfn%40googlegroups.com.

[Jon Lui]

I don't see my trace events. this is what i defined. Did I do something wrong?

PERFETTO_DEFINE_CATEGORIES(

    perfetto::Category("media_drv")

        .SetDescription("Events related to VA buffer creation"),

    perfetto::Category("gst")

        .SetDescription("Events related to GstVaEncoder encoding"));

data_sources {

  config {

    name: "track_event"

    track_event_config {

      enabled_categories: "media_drv"

      enabled_categories: "gst"

      disabled_categories: "*"

    }

  }

}

[Lalit Maganti]

I'm not sure but also fwiw if you are using the SDK inside a C application, any reason why you are not using the C SDK? 

Headers at: https://cs.android.com/android/platform/superproject/main/+/main:external/perfetto/include/perfetto/public/;l=1?q=f:Perfetto%20f:public&sq=

Self contained example at: https://cs.android.com/android/platform/superproject/main/+/main:external/perfetto/examples/shared_lib/example_shlib_track_event.c

I'd suggest seeing if the example works first to confirm if the problem is on the collection side or recording side. 

To view this discussion visit https://groups.google.com/d/msgid/perfetto-dev/3b7f672c-f0c9-4ae6-b250-70735aa5a4c5n%40googlegroups.com.

[Jon Lui]

I wasn't aware of a C SDK. I was reading the document and it only showed C++. Thanks for the links.