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.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
https://docs.microsoft.com/dotnet/core/
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libhostpolicy.so requires pthread_create but does not include it #43036

Closed vitek-karas closed 1 year ago

vitek-karas commented 4 years ago

On Linux in .NET 5 libhostpolicy.so requires symbol pthread_create, but it doesn't include it, so if used the calling code must provide this dependency. This is effectively breaking change from .NET Core 3.1 where libhostpolicy.do didn't require this symbol.

Repro: Get a local close of the HostingWithHostFxr sample. It targets 3.1 - so running dotnet run from the root of the sample should just work (prints out some sample output). Retargetting the projects to .NET 5 (modify DotNetLib.csproj and NativeHost.csproj to target net5.0) and running dotnet run again (using .NET 5 RC2) will fail with:

Failed to load /home/user/.dotnet.installs/5.0.rc2/shared/Microsoft.NETCore.App/5.0.0-rc.2.20468.4/libhostpolicy.so, error: /home/user/.dotnet.installs/5.0.rc2/shared/Microsoft.NETCore.App/5.0.0-rc.2.20468.4/libhostpolicy.so: undefined symbol: pthread_create
An error occurred while loading required library libhostpolicy.so from [/home/user/.dotnet.installs/5.0.rc2/shared/Microsoft.NETCore.App/5.0.0-rc.2.20468.4]
Failed to initialize context for config: /home/user/dotnet/samples/core/hosting/HostWithHostFxr/bin/Debug/DotNetLib.runtimeconfig.json. Error code: 0x80008082
Init failed: 0x80008082

Looking into the make files the apphost will be built with -pthread but no library will be built that way. So any hosting which is not going through apphost (or dotnet) will potentially run into this problem. https://github.com/dotnet/runtime/blob/f1e131a4bef5bd5373a3dab65523851b54a94306/src/installer/corehost/cli/common.cmake#L46-L53

If we have a hard dependency on pthread from hostpolicy, then hostpolicy should be built with it.

ghost commented 4 years ago

Tagging subscribers to this area: @vitek-karas, @agocke See info in area-owners.md if you want to be subscribed.

TheVice commented 3 years ago

Hello.

This behavior should be noted for all who test functional that use 'libhostpolicy.so'. For example if you use Google Test, that configured to use 'pthread', that is by default at current version that located at Ubuntu repository, you will success call that functional.

However at deploy version, that usually build without test libraries, you will have a problem described here.

Let see a quick sample that get context and read the properties of host:

extern "C" {
#include "host_fxr.h"
};

#include <gtest/gtest.h>

#include <string>

#include <cstdlib>
#include <cstdint>

#include <fstream>
#include <ostream>
#include <iostream>

#define HOST_FX_RESOLVER_NON_SUCCESS_(RESULT) ((RESULT) < static_cast<int32_t>(host_fxr_Success) || static_cast<int32_t>(host_fxr_Success_DifferentRuntimeProperties) < (RESULT))

std::string create_json_config(const char* tfm, const char* framework_version)
{
    std::string content;
    content += "{\n";
    content += "  \"runtimeOptions\": {\n";
    content += "    \"tfm\": \"";
    content += tfm;
    content += "\",\n";
    content += "    \"rollForward\": \"LatestMinor\",\n";
    content += "    \"framework\": {\n";
    content += "      \"name\": \"Microsoft.NETCore.App\",\n";
    content += "      \"version\": \"";
    content += framework_version;
    content += "\"\n";
    content += "    }\n";
    content += "  }\n";
    content += "}";
    return content;
}

#if defined(_MSC_VER)
GTEST_API_ int wmain(int argc, wchar_t** argv)
#else
GTEST_API_ int main(int argc, char** argv)
#endif
{
    testing::InitGoogleTest(&argc, argv);

    if (argc < 2)
    {
        std::cout << "No input data." << std::endl;
        return EXIT_FAILURE;
    }

    {
        const auto json_config = create_json_config("netcoreapp5.0", "5.0.0");//"netcoreapp3.1", "3.1.0"
        std::ofstream json_config_file("1.json");
        json_config_file << json_config;
        json_config_file.close();
    }

    uint8_t ptr_to_host_fxr_object[UINT8_MAX];
    const type_of_element* path_to_host_fxr = reinterpret_cast<const type_of_element*>(argv[1]);
#if defined(_MSC_VER)
    const type_of_element* runtime_config_path = L"1.json";
#else
    const type_of_element* runtime_config_path = reinterpret_cast<const type_of_element*>("1.json");
#endif

    if (!host_fx_resolver_load(path_to_host_fxr, ptr_to_host_fxr_object, sizeof(ptr_to_host_fxr_object)))
    {
        std::cerr << "Failed to load object from '" << path_to_host_fxr << "' " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

    const auto function_name = reinterpret_cast<const uint8_t*>("hostfxr_initialize_for_runtime_config");
    const uint8_t function_name_length = 37;

    if (!host_fx_resolver_is_function_exists(ptr_to_host_fxr_object, function_name, function_name_length))
    {
        host_fx_resolver_unload(ptr_to_host_fxr_object);
        std::cerr << "Host '" << path_to_host_fxr << "' do not have '" << function_name << "' function at line " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

    type_of_element* path_to_assembly = nullptr;
    type_of_element* path_to_dot_net_root = nullptr;
    void* context;
    //
    int32_t result = host_fxr_initialize_for_runtime_config_parameters_in_parts(ptr_to_host_fxr_object,
                     runtime_config_path, path_to_assembly, path_to_dot_net_root, &context);

    if (HOST_FX_RESOLVER_NON_SUCCESS_(result))
    {
        host_fx_resolver_unload(ptr_to_host_fxr_object);
        std::cerr << "Failed to call '" << function_name << "' function " << result << " at line " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

    size_t count = 0;
    type_of_element** keys = NULL;
    type_of_element** values = NULL;
    //
    result = host_fxr_get_runtime_properties(ptr_to_host_fxr_object, context, &count, keys, values);

    if (static_cast<int32_t>(host_fxr_HostApiBufferTooSmall) != result)
    {
        result = host_fxr_close(ptr_to_host_fxr_object, context);

        if (HOST_FX_RESOLVER_NON_SUCCESS_(result))
        {
            host_fx_resolver_unload(ptr_to_host_fxr_object);
            std::cerr << "Failed to call 'close' function " << result << " at line " << __LINE__ << std::endl;
        }

        host_fx_resolver_unload(ptr_to_host_fxr_object);
        std::cerr << "Failed to call 'host_fxr_get_runtime_properties' function " << result << " at line " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

    std::string data(2 * count * sizeof(type_of_element*), '\0');
    keys = reinterpret_cast<type_of_element**>(&data[0]);
    values = reinterpret_cast<type_of_element**>(&data[0] + count * sizeof(type_of_element*));
    //
    result = host_fxr_get_runtime_properties(ptr_to_host_fxr_object, context, &count, keys, values);

    if (HOST_FX_RESOLVER_NON_SUCCESS_(result))
    {
        result = host_fxr_close(ptr_to_host_fxr_object, context);

        if (HOST_FX_RESOLVER_NON_SUCCESS_(result))
        {
            host_fx_resolver_unload(ptr_to_host_fxr_object);
            std::cerr << "Failed to call 'close' function " << result << " at line " << __LINE__ << std::endl;
        }

        host_fx_resolver_unload(ptr_to_host_fxr_object);
        std::cerr << "Failed to call 'host_fxr_get_runtime_properties' function " << result << " at line " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

#if defined(_MSC_VER)
    std::wstring key(INT8_MAX, L'\0');
    std::wstring value(INT16_MAX, L'\0');
#else
    std::string key(INT8_MAX, '\0');
    std::string value(INT16_MAX, '\0');
#endif

    for (size_t i = 0; i < count; ++i)
    {
        key.clear();
        value.clear();
#if defined(_MSC_VER)
        key += keys[i];
        value += values[i];
        //
        std::wcout << i << std::endl <<
                   L"PROPERTY NAME: '" << key << L"'" << std::endl <<
                   L"PROPERTY VALUE: '" << value << L"'" << std::endl;
#else
        key += reinterpret_cast<const char*>(keys[i]);
        value += reinterpret_cast<const char*>(values[i]);
        //
        std::cout << i << std::endl <<
                  "PROPERTY NAME: '" << key << "'" << std::endl <<
                  "PROPERTY VALUE: '" << value << "'" << std::endl;
#endif
    }

    result = host_fxr_close(ptr_to_host_fxr_object, context);

    if (HOST_FX_RESOLVER_NON_SUCCESS_(result))
    {
        host_fx_resolver_unload(ptr_to_host_fxr_object);
        std::cerr << "Failed to call 'close' function " << result << " at line " << __LINE__ << std::endl;
        return EXIT_FAILURE;
    }

    host_fx_resolver_unload(ptr_to_host_fxr_object);
    return EXIT_SUCCESS;
}

If you will remove call of 'testing::InitGoogleTest(&argc, argv);' function, code will fail and you got

root@7c078117f286:# ./tests /usr/share/dotnet/host/fxr/5.0.3/libhostfxr.so Failed to load /usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/libhostpolicy.so, error: /usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/libhostpolicy.so: undefined symbol: pthread_create An error occurred while loading required library libhostpolicy.so from [/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3] Failed to initialize context for config: 1.json. Error code: 0x80008082 Failed to call 'hostfxr_initialize_for_runtime_config' function -2147450750 at line 96

However without that remove, code success output required data:

root@7c078117f286:# ./tests /usr/share/dotnet/host/fxr/5.0.3/libhostfxr.so 0 PROPERTY NAME: 'RUNTIME_IDENTIFIER' PROPERTY VALUE: 'ubuntu.20.04-x64' 1 PROPERTY NAME: 'FX_DEPS_FILE' PROPERTY VALUE: '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/Microsoft.NETCore.App.deps.json' 2 PROPERTY NAME: 'APP_CONTEXT_DEPS_FILES' PROPERTY VALUE: '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/Microsoft.NETCore.App.deps.json' 3 PROPERTY NAME: 'APP_CONTEXT_BASE_DIRECTORY' PROPERTY VALUE: '' 4 PROPERTY NAME: 'PLATFORM_RESOURCE_ROOTS' PROPERTY VALUE: ':' 5 PROPERTY NAME: 'PROBING_DIRECTORIES' PROPERTY VALUE: '' 6 PROPERTY NAME: 'NATIVE_DLL_SEARCH_DIRECTORIES' PROPERTY VALUE: ':/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3:' 7 PROPERTY NAME: 'TRUSTED_PLATFORM_ASSEMBLIES' PROPERTY VALUE: '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/netstandard.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/WindowsBase.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.XmlDocument.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.XPath.XDocument.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.XDocument.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.ReaderWriter.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Web.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Web.HttpUtility.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.ValueTuple.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Transactions.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Xml.XmlSerializer.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Transactions.Local.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Thread.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Tasks.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Tasks.Extensions.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.ThreadPool.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Tasks.Dataflow.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Text.RegularExpressions.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Text.Json.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Text.Encoding.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Text.Encoding.Extensions.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Text.Encoding.CodePages.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Timer.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Threading.Tasks.Parallel.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Linq.Parallel.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Diagnostics.DiagnosticSource.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Numerics.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.FileSystem.Primitives.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.Compression.FileSystem.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.Compression.Brotli.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Diagnostics.Process.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Net.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Globalization.Calendars.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.FileSystem.DriveInfo.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Net.NameResolution.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Formats.Asn1.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Dynamic.Runtime.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.FileSystem.AccessControl.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Drawing.Primitives.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.ComponentModel.DataAnnotations.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Linq.Queryable.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Linq.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Runtime.Serialization.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.MemoryMappedFiles.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Diagnostics.TraceSource.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Runtime.InteropServices.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/Microsoft.CSharp.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Globalization.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.ComponentModel.Annotations.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Runtime.Serialization.Primitives.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.IO.FileSystem.Watcher.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Diagnostics.Tracing.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Net.ServicePoint.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Collections.Concurrent.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Collections.Immutable.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Drawing.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Resources.ResourceManager.dll:/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.3/System.Diagnostics.Debug.dll:/usr/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Full source code can be found here. Two runs of GitHub actions, with different results, can be view here: FAILED (no call InitGoogleTest) SUCCESS (call InitGoogleTest) (commit that made this possible).

That also can be used as workaround way, of course do not use Google Test library, but by directly loading of 'pthread' library into process that required to use 'libhostpolicy.so'.

Cheers.

abhishekthetechguy commented 2 years ago

Hello @vitek-karas

Hope you are doing well. I wanted to know if a solution has been made available for this? Or if you can suggest how to work our way around this. I have run into the same problem on CentOS7 with .net core 5.0. I have tried loading the pthread library using dlopen but it doesn't solve my problem. If possible, it would be great if you can share some code reference on how to navigate my way around this.

Please let me know if you need any specific details from my side.

Regards Abhishek

vitek-karas commented 2 years ago

I don't have an answer right now, nobody from our side actually looked into this yet. @VSadov might have some additional ideas.

AaronRobinsonMSFT commented 1 year ago

@vitek-karas @agocke @elinor-fung Users of DNNE are hitting this issue now. See this issue, linked above. I was able to fix it by linking against the pthreads lib, but only if the native lib exporting the .NET function was also passed to the linker. If users are using dlopen to dynamically reference and load the native library, finding the export via dlsym, passing pthread to the linker does nothing because it isn't being used in any of the translation units and is thus not linked against.

vitek-karas commented 1 year ago

https://github.com/dotnet/runtime/issues/86940 also mentiond potential need for libdl.so

vitek-karas commented 1 year ago

@elinor-fung could you please look what it would take to fix this? Maybe it's simple enough...

suihan0104 commented 1 year ago

Why can't I directly add a -lpthread -ldl @vitek-karas

vitek-karas commented 1 year ago

Why can't I directly add a -lpthread -ldl

To what - to the build of hostfxr? It's very possible that it's that simple, I just don't trust my very limited knowledge of the linux build in runtime repo to answer that - hopefully @elinor-fung will be able to do so.

jkoritzinsky commented 1 year ago

Interestingly, the deb packaging build emits warnings about this exact issue, but generally we don't try to keep that portion of the build warning-clean. Probably would have caught this earlier if we used more standard tooling and had better validation of that space.

elinor-fung commented 1 year ago

Huh - that is good to know. Also lets me confirm that the warning no longer shows up in https://github.com/dotnet/runtime/pull/87042.