On Thu, Feb 29, 2024 at 07:37:11PM +0000, Matthew Wilcox wrote: > On Thu, Feb 29, 2024 at 11:25:13AM -0700, Greg Edwards wrote: >>> [1/1] block: Remove special-casing of compound pages >>> commit: 1b151e2435fc3a9b10c8946c6aebe9f3e1938c55 >> >> This commit results in a change of behavior for QEMU VMs backed by hugepages >> that open their VM disk image file with O_DIRECT (QEMU cache=none or >> cache.direct=on options). When the VM shuts down and the QEMU process exits, >> one or two hugepages may fail to free correctly. It appears to be a race, as >> it doesn't happen every time. > > By sheer coincidence the very next email after this one was: > > https://lore.kernel.org/linux-mm/86e592a9-98d4-4cff-a646-0c0084328356@xxxxxxxxxxxxxxx/T/#u > > Can you try Tony's patch and see if it fixes your problem? > I haven't even begun to analyse either your email or his patch, > but there's a strong likelihood that they're the same thing. This does appear to fix it. Thank you! I'll do some more testing on it today, then add a Tested-by: tag if it holds up. Greg
