On Mon, Sep 07, 2026 at 06:46:42AM -0400, Greg Troxel wrote:
It seems overwhelmingly likely that there are bugs in the NetBSD ext2
implementation. A program like rsync cannot cause a system lockup other
than via triggering a usually-latent kernel bug.
You might try using the rump option to mount, or to see if there are
fuse ext2fs implementations. Perhaps between code reading and
experiments you can find the bug.
My own approach is not to use ext2fs :-)
Actually I see occasional hangs with rsync to FFS-formatted external drives.
So we can't rule out a USB issue.