[FUZZ] OOM in lodestar_enr

[Daft-Wullie]

I've identified a fuzzer crash and am contributing to the security of Ethereum 2!

I've done and provided the following:

• Checked to see if any other [FUZZ] issue already refers to that crasher
• Attached the crashing input (either attached to the issue as a .zip or .gz, or as a link to a file sharing service)
• Noted the beacon-fuzz version or commit used.
• Provided crash output
• Noted the command or fuzzer used to generate the crash
• Name of the original crash file
• (Optional but optimal) Checked if the crash can be consistently replicated by re-running the input.

Info to Reproduce

• Command run: e.g. make fuzz-all
• Crasher file name: crash-333c4abf56a03bb10a790ecf860a8dd41557849c8c635bf1e66d9f2c8a80f3d6
  crash-333c4abf56a03bb10a790ecf860a8dd41557849c8c635bf1e66d9f2c8a80f3d6.zip
• Client exercised: lodestar
• Fuzzing engine used (if applicable): jsfuzz

Crash output and stacktrace

#22477 PULSE     cov: 6738 corp: 3562 exec/s: 24 rss: 159.9 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 412.4 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 663.46 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 965.88 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 1050.84 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 1356.09 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 1562.6 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 1775.48 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 2004.07 MB
#22477 PULSE     cov: 6738 corp: 3562 exec/s: 0 rss: 2005.75 MB
MEMORY OOM: exceeded 2048 MB. Killing worker
Worker killed
crash was written to crash-333c4abf56a03bb10a790ecf860a8dd41557849c8c635bf1e66d9f2c8a80f3d6
Worker exited

Your Environment

• Fuzzer ran: eth2fuzz
• Version/Commit used:
• Operating System and version: Ubuntu 20.04

[pventuzelo]

Look like a duplicate of ChainSafe/discv5#64.

Nevertheless I prefer to keep this issue open until it is fixed.