[diffoscope] diffoscope - Excessive memory usage?

[Adam Baxter]

I hit this, with two ISO files. I can provide them - or you can probably attempt the same thing I did:

One was an image generated from pretty much default settings at https://incusos-customizer.linuxcontainers.org, the other was https://images.linuxcontainers.org/os/202511070055/x86_64/IncusOS_202511070055.iso.gz which I ungzipped before trying to compare.

diffoscope 306 installed using pipx on a Debian Trixie VM that luckily had enough memory allocated for the ~48GB diffoscope used before producing...

--- IncusOS_202511070055.iso
+++ IncusOS_202511070055_custom.iso
├── 1
│ @@ -4194297,8 +4194297,8 @@
│  03ffff80: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffff90: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffffa0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffffb0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffffc0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffffd0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│  03ffffe0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
│ -[ Too much input for diff (SHA256: 8b95fc3b6cb2f9cbcd6399026808cd2748a079932fa63c0ecea4e0a06fd5456a) ]
│ +[ Too much input for diff (SHA256: 614aeff5d99bfab421798c245c85bf50228d0b6750ee5aea8ca5f93f877625c7) ]


Thanks,
Adam