sigsegv trying to start remote IDE session via JetBrains Gateway about nix-ld

[SuperSandro2000]

You could use system.replaceRuntimeDependencies to only replace the final package.
Do you know the command that is being executed? Can you run strace on it?

[Mic92]

You wouldn't override /lib64/ld-linux-x86-64.so.2 because this is not your libc. Instead, you would set NIX_LD to a glibc with debug symbols.

[Mic92]

The crash also happens actually in glibc and not in nix-ld as you can see from the stacktrace.

[Mic92]

I have not added yet support to make nix-ld an executable - it's only a library, so the way you are trying to start will not work yet. For now you have to manually replace /lib64/ld-linux-x86-64.so.2 in your script with the actual glibc link loader.

[pschyska]

I have not added yet support to make nix-ld an executable - it's only a library, so the way you are trying to start will not work yet. For now you have to manually replace /lib64/ld-linux-x86-64.so.2 in your script with the actual glibc link loader.

Ah yes! This is it. I didn't realize the script ¹ actually calls ld-linux-x86-64.so.2 --library-path … exe instead of LD_LIBRARY_PATH=… exe. I'll try to find out if that behaviour can be controlled somehow. I think I should be able to hack $PATH for this specific use-case to prefer glibc instead of nix-ld.

Would it be hard to make nix-ld executable standalone by putting the arguments into (NIX_?)LD_LIBRARY_PATH and calling into glibc? Or alternatively (as nix-ld's functionality is not required here) just forwarding to ${glibc}/…/ld-linux-x86-64.so.2?

Footnotes

1. Which unfortunately isn't mine, but JetBrains'. AFAICS an attempt to be able to deploy IDEs to arbitary "linux" hosts over ssh without incurring remote dependencies by shipping some .so files with it — which faceplants on systems like NixOS. To add insult to injury it all happens in some temporary folders which disappear after the processes crash, but I'll try to preserve them somehow, or find the source of this script. ↩

[Mic92]

Not so hard, it would be another execve to $NIX_LD, if it detects that it is not called as a library.

[Mic92]

so musl libc detect this by checking if aux[AT_BASE] is set:

https://git.musl-libc.org/cgit/musl/tree/ldso/dlstart.c?id=f47a8cdd250d9163fcfb39bf4e9d813957c0b187#n104

[Mic92]

fixed in #47