CrossGen2 musl nupkg embeds the libc host

[ayakael]

Description

CrossGen2 6.0.8 nupkg links to wrong libc on linux-musl-arm64 / linux-musl-arm environment.

Unfortunately it seems that it wasn't fixed here, as to this day the error still occurs.

Reproduction Steps

$ wget 'https://globalcdn.nuget.org/packages/microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg'
$ unzip microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg
$ ldd tools/crossgen2
		/lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libpthread.so.0 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libdl.so.2 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xffffb8282000)
	libm.so.6 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xffffb825d000)
	libc.so.6 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
Error loading shared library ld-linux-aarch64.so.1: No such file or directory (needed by tools/crossgen2)

Expected behavior

Should link to ld-linux-musl-aarch64.so.1

Actual behavior

Rather links to ld-linux-aarch64.so.1

Regression?

I've been keeping track of the fix, waiting for it to eventually apply to the crossgen2 nuget packages. It never did.

Known Workarounds

Does not occur when built via source-build on Alpine environment. See package available at via
https://dl-cdn.alpinelinux.org/alpine/edge/community/arm64/dotnet6-bootstrap-artifacts-6.0.108-r2.apk (tar package, available at `./usr/lib/dotnet/artifacts/6.0.108/microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg)

Configuration

No response

Other information

No response

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Issue Details

---

Description

CrossGen2 6.0.8 nupkg links to wrong libc on linux-musl-arm64 / linux-musl-arm environment.

Unfortunately it seems that it wasn't fixed here, as to this day the error still occurs.

Reproduction Steps

$ wget 'https://globalcdn.nuget.org/packages/microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg'
$ unzip microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg
$ ldd tools/crossgen2
		/lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libpthread.so.0 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libdl.so.2 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xffffb8282000)
	libm.so.6 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xffffb825d000)
	libc.so.6 => /lib/ld-linux-aarch64.so.1 (0xffffb84a3000)
Error loading shared library ld-linux-aarch64.so.1: No such file or directory (needed by tools/crossgen2)

Expected behavior

Should link to ld-linux-musl-aarch64.so.1

Actual behavior

Rather links to ld-linux-aarch64.so.1

Regression?

I've been keeping track of the fix, waiting for it to eventually apply to the crossgen2 nuget packages. It never did.

Known Workarounds

Does not occur when built via source-build on Alpine environment. See package available at via
https://dl-cdn.alpinelinux.org/alpine/edge/community/arm64/dotnet6-bootstrap-artifacts-6.0.108-r2.apk (tar package, available at `./usr/lib/dotnet/artifacts/6.0.108/microsoft.netcore.app.crossgen2.linux-musl-arm64.6.0.8.nupkg)

Configuration

No response

Other information

No response

Author:	ayakael
Assignees:	-
Labels:	area-Infrastructure-coreclr
Milestone:	-

[hoyosjs]

@mangod9 I haven't tested if this only affects 6.0

[mangod9]

@am11 as fyi. @ayakael looks like this was only fixed in .NET 7. Is the ask to backport to 6?

[am11]

It is fixed in v7:

$ ldd 7.0.0-preview.7.22375.6/tools//crossgen2
	/lib/ld-musl-aarch64.so.1 (0x4000000000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x4002572000)
	libz.so.1 => /lib/libz.so.1 (0x4002762000)
	libc.musl-aarch64.so.1 => /lib/ld-musl-aarch64.so.1 (0x4000000000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x4002789000)

# vs.

$ ldd 6.0.8/tools/crossgen2
	/lib/ld-linux-aarch64.so.1 (0x4000000000)
	libpthread.so.0 => /lib/ld-linux-aarch64.so.1 (0x4000000000)
	libdl.so.2 => /lib/ld-linux-aarch64.so.1 (0x4000000000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x40018df000)
	libm.so.6 => /lib/ld-linux-aarch64.so.1 (0x4000000000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x4001acf000)
	libc.so.6 => /lib/ld-linux-aarch64.so.1 (0x4000000000)
Error loading shared library ld-linux-aarch64.so.1: No such file or directory (needed by 6.0.8/tools/crossgen2)

so we would need to backport it manually to v6 branch, since in v6, the issue is not related to AOT vs. singlefile but rather the configuration which affects the compile step.

[am11]

@ayakael, if you could apply https://github.com/dotnet/runtime/pull/73986.patch and test whether it fixes the issue in Alpine distro package, that would be great.