panic: bounce buffer already in use!

[davidkaroly]

Got this panic while building llvm18. It seems to happen after heavy usage of the file system, with lots of small files.

Steps to reproduce looks something like this:

1. build llvm18 with haikuporter
2. delete the work directory: rm -rf work-18.1.2
3. start the build again.
4. we get a panic

Screenshot: tbd, unfortunately I didn't create one. It will take some time to trigger this again.

I saw this on recent hrevs e.g. hrev57667 in VMware Player. Seems to happen both on 32-bit and 64-bit.