[camera][iOS] using startImageStream() can lead to memory crash on iOS #97941

renanyoy · 2022-02-07T08:21:47Z

Steps to Reproduce

Execute flutter run on the code sample
memory problems..

Code sample

    final controller = CameraController(camera, ResolutionPreset.max,
        enableAudio: false, imageFormatGroup: ImageFormatGroup.bgra8888);
    await controller.initialize();
    controller.lockCaptureOrientation(DeviceOrientation.portraitUp);
      controller.startImageStream((image) async {
        if (paused) return;
        //this.image = image;
      });

Logs

[  322 ms] flutter: |L2K|camera initialized
[ 1156 ms] [ServicesDaemonManager] interruptionHandler is called. -[FontServicesDaemonManager connection]_block_invoke
[  434 ms] *** Terminating app due to uncaught exception 'NSMallocException', reason: 'Failed to grow buffer'
[        ] *** First throw call stack:
[        ] (0x18091d0fc 0x199169d64 0x180a2ab24 0x180a22e10 0x1808b733c 0x1820e1ad8 0x1820dd764 0x182125870 0x182127fa8 0x18210d69c 0x10f30d234 0x10f30d044 0x10f30d234 0x10f30d788 0x10f30af84 0x10c445528 0x18058d924 0x18058f670 0x18059db70 0x1808d5d84 0x18088ff5c 0x1808a3468 0x19c44338c
0x1832465d0 0x182fc4f74 0x10404085c 0x10b795aa4)
[        ] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** NSAllocateMemoryPages(33177600) failed'
[        ] *** First throw call stack:
[        ] (0x18091d0fc 0x199169d64 0x182127f30 0x1820d3260 0x1820e69e0 0x10c444ab0 0x19f304124 0x19f2ee27c 0x19f534098 0x19f6ea6b8 0x18058f670 0x180592b44 0x1805a5c48 0x180596ccc 0x180597968 0x1805a21b8 0x1f13ab0f4 0x1f13aae94)
[        ] libc  abi: terminating with uncaught exception of type NSException
[        ] libc  abi: terminating with uncaught exception of type NSException
[  305 ms] Process 4459 stopped
[        ] * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
[        ]     frame #0: 0x00000001b7e79964 libsystem_kernel.dylib`__pthread_kill   8
[        ] libsystem_kernel.dylib`__pthread_kill:
[        ] ->  0x1b7e79964 < 8>:  b.lo   0x1b7e79984               ; < 40>
[        ]     0x1b7e79968 < 12>: pacibsp 
[        ]     0x1b7e7996c < 16>: stp    x29, x30, [sp, #-0x10]!
[        ]     0x1b7e79970 < 20>: mov    x29, sp
[        ] Target 0: (Runner) stopped.
[        ] ios-deploy exited with code 0
[  157 ms] Service protocol connection closed.
[        ] Lost connection to device.

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The text was updated successfully, but these errors were encountered:

danagbemava-nc · 2022-02-07T13:06:58Z

Hi @renanyoy, thanks for filing the issue.

Please provide a complete minimal reproducible code sample and the full flutter run -v logs.

Also, what version of camera are you using?

Thank you

renanyoy · 2022-02-07T13:26:38Z

the log and the sample are in the first post

we are using the latest camera addon 0.9.4 10.

danagbemava-nc · 2022-02-07T14:25:38Z

Neither of the info you provided in the initial post is complete, which is why I asked for a complete minimal reproducible code sample as well as full logs.

Also, the steps to reproduce aren't quite clear to me.

Does the app crash on startup or does it crash after a certain period of time? Also, what device did you experience the crash with?

also, when seeking after solutions, I found that the problem should be fixed with this pull request
flutter/plugins#4520

If this PR should fix the issue, then this issue should probably be dedup'd with #44436

renanyoy · 2022-02-08T09:43:26Z

it crash at startImageStream(..)

made a mistake I don't think this PR will fix it finally..

I'll try to make a sample project

renanyoy · 2022-02-09T08:42:32Z

the full code

import 'dart:developer' as dev;
import 'dart:math';

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const Home(),
    );
  }
}

class Home extends StatefulWidget {
  const Home({Key? key}) : super(key: key);
  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  late CameraController controller;
  bool initialized = false;

  @override
  void initState() {
    super.initState();
    init();
  }

  Future<CameraController> initCamera(CameraDescription camera) async {
    final controller = CameraController(camera, ResolutionPreset.max,
        enableAudio: false, imageFormatGroup: ImageFormatGroup.yuv420);
    await controller.initialize();
    controller.lockCaptureOrientation(DeviceOrientation.portraitUp);
    return controller;
  }

  Future<void> init() async {
    final cameras = await availableCameras();
    controller = await initCamera(cameras.first);
    initialized = true;
    setState(() {});
    controller.startImageStream((image) {
      dev.log('frame');
    });
    (() async {
      // OCR cpu usage simulation
      while (true) {
        await Future.delayed(const Duration(seconds: 2));
        double z = 0;
        for (int i = 0; i < 100000000; i  ) {
          z = cos(z);
        }
      }
    })();
  }

  @override
  Widget build(BuildContext context) {
    return initialized ? CameraPreview(controller) : Container();
  }
}

danagbemava-nc · 2022-02-09T12:38:27Z

Hi @renanyoy, can you also provide the full flutter run -v log? Also, did you experience this issue in debug mode or profile/release mode?

renanyoy · 2022-02-11T08:52:14Z

it crash in debug and release
but I seen it working one time without crashing

https://pub.waves.pw/ms/crash.log.txt
log is too big to post here

danagbemava-nc · 2022-02-11T12:52:51Z

Hi @renanyoy, what device were you testing with?

renanyoy · 2022-02-11T13:19:52Z

iPhone XR

danagbemava-nc · 2022-02-11T14:15:56Z

I can reproduce the memory crash in debug mode, but I haven't been able to reproduce the crash in profile mode yet.

Tested on iPhone XS.

Steps to reproduce

Run the code sample below
Use the camera to scan around
Depending on which mode you're in debug/profile, it'll take a while until the memory error comes. I haven't been able to get it crash in profile mode yet

code sample

import 'dart:developer' as dev;
import 'dart:math';

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const Home(),
    );
  }
}

class Home extends StatefulWidget {
  const Home({Key? key}) : super(key: key);
  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  late CameraController controller;
  bool initialized = false;

  @override
  void initState() {
    super.initState();
    init();
  }

  Future<CameraController> initCamera(CameraDescription camera) async {
    final controller = CameraController(camera, ResolutionPreset.max,
        enableAudio: false, imageFormatGroup: ImageFormatGroup.yuv420);
    await controller.initialize();
    controller.lockCaptureOrientation(DeviceOrientation.portraitUp);
    return controller;
  }

  Future<void> init() async {
    final cameras = await availableCameras();
    controller = await initCamera(cameras.first);
    initialized = true;
    setState(() {});
    controller.startImageStream((image) {
      dev.log('frame');
    });
    (() async {
      // OCR cpu usage simulation
      while (true) {
        await Future.delayed(const Duration(seconds: 2));
        double z = 0;
        for (int i = 0; i < 100000000; i  ) {
          z = cos(z);
        }
      }
    })();
  }

  @override
  Widget build(BuildContext context) {
    return initialized ? CameraPreview(controller) : Container();
  }
}

crash log

debug.log

flutter doctor -v

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    • #0      _Utf8Decoder.convertSingle (dart:convert-patch/convert_patch.dart:1789:7)
      #1      Utf8Decoder.convert (dart:convert/utf.dart:351:42)
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      #9      IntelliJValidator.validate (package:flutter_tools/src/intellij/intellij_validator.dart:103:15)
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      #11     asyncGuard.<anonymous closure> (package:flutter_tools/src/base/async_guard.dart:109:18)
      #12     _rootRun (dart:async/zone.dart:1426:13)
      #13     _CustomZone.run (dart:async/zone.dart:1328:19)
      #14     _runZoned (dart:async/zone.dart:1861:10)
      #15     runZonedGuarded (dart:async/zone.dart:1849:12)
      #16     runZoned (dart:async/zone.dart:1780:12)
      #17     asyncGuard (package:flutter_tools/src/base/async_guard.dart:109:3)
      #18     Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:205:9)
      #19     Doctor.diagnose (package:flutter_tools/src/doctor.dart:309:47)
      #20     DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:50:48)
      #21     FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:1320:12)
      <asynchronous suspension>
      #22     FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1161:27)
      <asynchronous suspension>
      #23     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
      <asynchronous suspension>
      #24     CommandRunner.runCommand (package:args/command_runner.dart:209:13)
      <asynchronous suspension>
      #25     FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:281:9)
      <asynchronous suspension>
      #26     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
      <asynchronous suspension>
      #27     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:229:5)
      <asynchronous suspension>
      #28     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:62:9)
      <asynchronous suspension>
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      <asynchronous suspension>
      #30     main (package:flutter_tools/executable.dart:94:3)
      <asynchronous suspension>


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hellohuanlin · 2022-02-11T21:40:38Z

@danagbemava-nc how long did it take for you to crash on your device? I couldn't get it crash on my iPhone 13 mini but can try my old phone.

hellohuanlin · 2022-02-11T22:11:14Z

I wasn't able to get it crashed on my phone, but i do notice the lagging, which is expected because of the expensive operation in the example:

      // OCR cpu usage simulation
      while (true) {
        await Future.delayed(const Duration(seconds: 2));
        double z = 0;
        for (int i = 0; i < 100000000; i  ) {
          z = cos(z);
        }
      }

@renanyoy does it crash for you if you remove this block?

renanyoy · 2022-02-12T07:53:59Z

in the real app, there is a block doing the OCR using google ML kit, in that case it always crashes. you can try

// OCR cpu usage simulation
      while (true) {
        await Future.delayed(const Duration(milliseconds: 200));
        double z = 0;
        for (int i = 0; i < 1000000000; i  ) {
          z = cos(z);
        }
      }

to stress even more your iPhone 13. I tried to do a minimal reproducible sample, it's why this loop.

we can't activate the OCR part in our app for our iOS users cause of that crash.

without the loop it doesn't crash. I think the problem is that somewhere/sometime, when the flutter thread hang, the camera part is not skipping frames and retains them.. and in real app, consuming already lots of ram.. it crash quickly..

renanyoy · 2022-02-12T08:10:11Z

maybe it's possible to add a ram usage stress too, to get the crash more often.

danagbemava-nc · 2022-02-15T06:31:17Z

@danagbemava-nc how long did it take for you to crash on your device? I couldn't get it crash on my iPhone 13 mini but can try my old phone.

@hellohuanlin It took about 2 minutes. This time around, instead of moving the camera around, I just left the phone by itself.

Anfet · 2022-02-15T11:06:14Z

Not only IOS, but android experience issues with memory on several samsung and xiaomi phones.

I'm intererested why "stopImageStream" actually somehow stops and resets camera.

There is also a frequent error:
Fatal Exception: java.lang.IllegalArgumentException: Surface was abandoned at android.hardware.camera2.utils.SurfaceUtils.getSurfaceSize(SurfaceUtils.java:134) at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:426) at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:171) at io.flutter.plugins.camera.Camera.createCaptureSession(Camera.java:100) at io.flutter.plugins.camera.Camera.createCaptureSession(Camera.java:1) at io.flutter.plugins.camera.Camera.startPreview(Camera.java:23) at io.flutter.plugins.camera.Camera$1.onOpened(Camera.java:7) at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:165) at android.os.Handler.handleCallback(Handler.java:938)

hellohuanlin · 2022-02-15T21:13:01Z

@renanyoy the skipping frame part sounds somewhat related to #69874 but I am not sure yet.

Is it possible to bring that heavy computation off the ui thread? Or is it required to be on UI thread?

renanyoy · 2022-02-16T03:43:17Z

the computation is here to reproduce the crash more often, like in a real app, with lots of async things running everywhere in the app, and in our case, also doing OCR same time. If you manage to reproduce the crash without it, just remove it.

I think google ML kit runs in another thread/isolate, but copying images between isolates create some UI thread hang too.

stuartmorgan · 2022-02-17T21:30:16Z

Duplicate of #44436

github-actions · 2022-03-03T22:01:05Z

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

renanyoy changed the title ~~[camera] startImageStream() - memory crash~~ [camera] startImageStream() - memory crash on iOS (works on android) Feb 7, 2022

danagbemava-nc added the in triage Presently being triaged by the triage team label Feb 7, 2022

danagbemava-nc added the waiting for customer response The Flutter team cannot make further progress on this issue until the original reporter responds label Feb 7, 2022

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danagbemava-nc changed the title ~~[camera] startImageStream() - memory crash on iOS (works on android)~~ [camera][iOS] using startImageStream() can lead to memory crash on iOS Feb 11, 2022

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danagbemava-nc added perf: memory Performance issues related to memory plugin c: fatal crash Crashes that terminate the process labels Feb 11, 2022

stuartmorgan marked this as a duplicate of #44436 Feb 17, 2022

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[camera][iOS] using startImageStream() can lead to memory crash on iOS #97941

[camera][iOS] using startImageStream() can lead to memory crash on iOS #97941

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stuartmorgan commented Feb 17, 2022

github-actions bot commented Mar 3, 2022

[camera][iOS] using startImageStream() can lead to memory crash on iOS #97941

[camera][iOS] using startImageStream() can lead to memory crash on iOS #97941

Comments

renanyoy commented Feb 7, 2022 • edited Loading

Steps to Reproduce

danagbemava-nc commented Feb 7, 2022

renanyoy commented Feb 7, 2022 • edited Loading

danagbemava-nc commented Feb 7, 2022

renanyoy commented Feb 8, 2022 • edited Loading

renanyoy commented Feb 9, 2022

danagbemava-nc commented Feb 9, 2022

renanyoy commented Feb 11, 2022

danagbemava-nc commented Feb 11, 2022

renanyoy commented Feb 11, 2022

danagbemava-nc commented Feb 11, 2022

Steps to reproduce

hellohuanlin commented Feb 11, 2022

hellohuanlin commented Feb 11, 2022 • edited Loading

renanyoy commented Feb 12, 2022 • edited Loading

renanyoy commented Feb 12, 2022

danagbemava-nc commented Feb 15, 2022

Anfet commented Feb 15, 2022 • edited Loading

hellohuanlin commented Feb 15, 2022 • edited Loading

renanyoy commented Feb 16, 2022 • edited Loading

stuartmorgan commented Feb 17, 2022

github-actions bot commented Mar 3, 2022

renanyoy commented Feb 7, 2022 •

edited

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renanyoy commented Feb 7, 2022 •

edited

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renanyoy commented Feb 8, 2022 •

edited

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hellohuanlin commented Feb 11, 2022 •

edited

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renanyoy commented Feb 12, 2022 •

edited

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Anfet commented Feb 15, 2022 •

edited

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hellohuanlin commented Feb 15, 2022 •

edited

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renanyoy commented Feb 16, 2022 •

edited

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