ipfs files write corruption in large HAMTs

[aschmahmann]

• Version:
  js-ipfs version: 0.11.1-5ddd0c555cc6577ee15667f4ef4e7f3a3b17d04c
  interface-ipfs-core version: ^0.151.1
  ipfs-http-client version: 1.0.0
  Repo version: 11
  System version: x64/linux
  Node.js version: v16.11.1
  Commit: 5ddd0c5

• Platform:
  Linux AdinPC 5.10.16.3-microsoft-standard-WSL2 #1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

• Subsystem:
  MFS

Severity:

High

Description:

• Added a large HAMT to jsipfs
• Copied the directory to MFS
• Wrote a small file into the new MFS directory
• Noticed that data disappeared

Steps to reproduce the error:

1. Extract the zip
2. jsipfs dag import basehamt.car (the output root CID is QmRrSZQc6bZBvdLzzeWy6ekLW4jGpNfTdiv1MeDstDmiM8)
3. jsipfs files cp /ipfs/QmRrSZQc6bZBvdLzzeWy6ekLW4jGpNfTdiv1MeDstDmiM8 /hamttest-mfs
4. cat supermodule_test | jsipfs files write --create /hamttest-mfs/supermodule_test
5. jsipfs stat /hamttest-mfs (should be QmTES6nWfSKFiDHUfqh4gNpibq9STwrUTjXnUxMsrXcdHC)
6. jsipfs ls QmRrSZQc6bZBvdLzzeWy6ekLW4jGpNfTdiv1MeDstDmiM8 | wc -l (output is 2006)
7. jsipfs ls QmTES6nWfSKFiDHUfqh4gNpibq9STwrUTjXnUxMsrXcdHC | wc -l (output is 2005 despite us having just added a new file)