I got the git upstream sources.
I used "git bisect" for the first time.
Out of 356 commits between 3.0.9 and the current version....
[8b3e60523aa3d86583a1df54c81c9d480ea19740] Improved the fix that ensures that the generator gets notified about an I/O error for the incremental directory that generated the error. The PROTOCOL_VERSION was bumped to 31 to implement this.
I got the git upstream sources.
I used "git bisect" for the first time.
Out of 356 commits between 3.0.9 and the current version....
[8b3e60523aa3d8 6583a1df54c81c9 d480ea19740] Improved the fix that ensures that the generator gets notified about an I/O error for the incremental directory that generated the error. The PROTOCOL_VERSION was bumped to 31 to implement this.
.... is the one that causes the problem.