Re: ZFS deadlocks/memory accounting issues

On Mon, Mar 16, 2026 at 03:08:44PM -0600, Alan Somers wrote:
> I once saw a similar bug.  In my case I had a process that mmap()ed
> some very large files on fusefs, consuming lots of inactive pages.
> And when the system comes under memory pressure, it asks ARC to evict
> first.  So the ARC would end up shrinking down to arc_min every time.
> In my case, the solution was to set vfs.fusefs.data_cache_mode=0 .  I
> suspect that similar bugs could be possible with UFS or tmpfs, if they
> have giant files that are mmaped().

What are 'similar bugs with UFS or tmpfs'?
Can you please be more specific, what is the erronous behavior?