[scudo] `cat -v` and `dd` report `memory exhausted`

[DemiMarie]

When Scudo malloc is in use, coreutils cat -v fails with memory exhausted before doing anything. dd can also faiil with this error, though it seems intermittent. Other programs, including complex ones like Chromium and the COSMIC desktop environment, work as expected.

This was originally reported to Nixpkgs as NixOS/nixpkgs#459884, but NixOS/nixpkgs#459884 (comment) recommended that I report this here.

In case it matters, Scudo is loaded via NixOS’s environment.memoryAllocator.provider, which uses what I believe is the equivalent of /etc/ld.so.preload on non-NixOS. Switching to GrapheneOS’s hardened allocator makes the problem go away, which indicates that it is not simply due to overriding libc malloc..

[cferris1000]

It sounds like the configuration for Scudo used is causing problems.

For this error, it usually means that there are too many allocations of a particular size being allocated and the region is not big enough to hold them all. Most of the time, simply increasing the region size in the configuration would fix this.

I can't even debug this without the config data used by this project.