BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index

Hi. Output of git bugreport:

---

Thank you for filling out a Git bug report! Please answer the following questions to help us understand your issue.

What did you do before the bug happened? (Steps to reproduce your issue)

Wanted to retain git tree structure when pulling latest and rebasing. First indication of error was the `rebase -r` of the merge commit

What did you expect to happen? (Expected behavior)

successful --rebase-merges rebase of my commits on top of master

What happened instead? (Actual behavior)

```sh
❯ git rebase -r master
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)
zsh: abort      git rebase -r master
```

What's different between what you expected and what actually happened?

Anything else you want to add:

I'm currently "stuck" in this state, not sure how to recover or repro:

```sh
❯ git s
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)
error: git died of signal 6

❯ git log

❯ git d head~
error: git died of signal 6
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)

❯ git log # works

❯ git status
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)
zsh: abort      git status

❯ git commit --amend
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)
zsh: abort      git commit --amend

❯ git checkout head fatal: Unable to create '/Users/XXXXX/YYYYY/.git/index.lock': File exists.

Another git process seems to be running in this repository, e.g. # All of this was run while git bugreport was running an editor opened by 'git commit'. Please make sure all processes are terminated then try again. If it still fails, a git process may have crashed in this repository earlier: remove the file manually to continue.

❯ rm /Users/XXXXX/YYYYY/.git/index.lock

❯ git checkout head
BUG: fsmonitor.c:21: fsmonitor_dirty has more entries than the index
(179457 > 1040)
zsh: abort      git checkout head

❯ git checkout head fatal: Unable to create '/Users/XXXXX/YYYYY/.git/index.lock': File exists.

Another git process seems to be running in this repository, e.g. an editor opened by 'git commit'. Please make sure all processes are terminated then try again. If it still fails, a git process may have crashed in this repository earlier: remove the file manually to continue. ```

Please review the rest of the bug report below. You can delete any lines you don't wish to share.

[System Info] git version: git version 2.37.1 cpu: x86_64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh feature: fsmonitor--daemon uname: Darwin 20.6.0 Darwin Kernel Version 20.6.0: Tue Feb 22 21:10:41 PST 2022; root:xnu-7195.141.26~1/RELEASE_X86_64 x86_64 compiler info: clang: 13.0.0 (clang-1300.0.29.30) libc info: no libc information available $SHELL (typically, interactive shell): /bin/zsh

[Enabled Hooks] pre-commit pre-push