Crash on android device with "Assertion at /__w/1/s/src/mono/mono/component/debugger-agent.c:5652"

[AArnott]

Android application type

.NET Android (net7.0-android, net8.0-android, etc.)

Affected platform version

VS 2022 17.9.2

Description

My android app starts on an android device, and quickly crashes with this in the debug output window:

Assertion at /__w/1/s/src/mono/mono/component/debugger-agent.c:5652, condition `extra_space != NULL && *extra_space != NULL' not met
[libc] Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 5599 (bank.eZcash.App), pid 5599 (bank.eZcash.App)

Steps to Reproduce

This doesn't repro on the most simple app that executes the same code that crashes in the original, so I'm not sure what else the app is doing or has done previously to get it into a state where the code fails. But for what it's worth, the method that just starts when the app crashes is:

public static Bip39Mnemonic Create(int entropyLengthInBits, ReadOnlyMemory<char> password)
{
	Requires.Argument(entropyLengthInBits % 32 == 0, nameof(entropyLengthInBits), Strings.MustBeNonZeroMultipleOf32);
	Span<byte> entropy = stackalloc byte[entropyLengthInBits / 8];
	RandomNumberGenerator.Fill(entropy);
	return new(entropy, password);
}

Note that a breakpoint set on the opening { is hit, but before I can even hit F10 to Step in the debugger, the app then crashes. It crashes whether or not the debugger is attached, though the crash without the debugger might be for another cause -- I can't tell.

Did you find any workaround?

No

Relevant log output

Here is the tail of the debug log:


[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.Serialization.Primitives.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.Encoding.Extensions.dll
Loaded assembly: /data/data/com.Nerdbank.eZcash.App/files/.__override__/System.Text.Encoding.Extensions.dll [External]
Resolved pending breakpoint at 'Bip39Mnemonic.cs:94,1' to Nerdbank.Bitcoin.Bip39Mnemonic Nerdbank.Bitcoin.Bip39Mnemonic.Create (int entropyLengthInBits, System.ReadOnlyMemory<char> password) [0x00000].
[bank.eZcash.App] * Assertion at /__w/1/s/src/mono/mono/component/debugger-agent.c:5652, condition `extra_space != NULL && *extra_space != NULL' not met
[libc] Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 5599 (bank.eZcash.App), pid 5599 (bank.eZcash.App)
[bank.eZcash.App] Background concurrent mark compact GC freed 12233(6984KB) AllocSpace objects, 0(0B) LOS objects, 91% free, 2221KB/26MB, paused 523us,5.172ms total 17.965ms

[grendello]

@thaystg would you mind taking a look at this? Thanks! :)

[thaystg]

Can you please test the same app using .NET 8.0.3? I fixed something that can be related.
Please install the 8.0.3 and then install the workloads and test again.
dotnet/runtime#97568

[AArnott]

Wonderful that you may have already fixed it. How do I install .NET 8.0.3 on the device? https://dotnet.microsoft.com/en-us/download/dotnet/8.0 suggests that 8.0.2 is the latest version. I believe I would control the runtime version on the device by controlling the SDK version, correct?

[thaystg]

Hum. It's not shipped yet. Also you are reproducing it on .net7 also? So it's not what I fixed.
Can you please run this adb command: adb shell setprop debug.mono.env "'MONO_SDB_ENV_OPTIONS=loglevel=10'
And then send us the log that is printed in the output window of VS?
Thanks.

[AArnott]

@thaystg I've attached the output window log after running the command and repro'ing the crash:
outputwindow.txt

This is while targeting .NET 8. This app's primary dependency is a library that targets .NET 8, so testing on .NET 7 would be non-trivial.

[thaystg]

Oh, okay. You didn't reproduce it on .net7 because it's hard to test, right?
So I suggest to wait .net8 8.0.3 that will be shipped very soon. And if it's still reproducing then we continue the investigation. I really think it's related with what I fixed.

[AArnott]

Sounds good. Hopefully 8.0.3 will come out tomorrow, since it's Patch Tuesday. :)