The Linux Kernel fix is here:
commit 274b924088e9
Author: Jeff Moyer <jmo...@redhat.com>
Date: Wed Aug 28 12:49:46 2019
libnvdimm/pfn: Fix namespace creation on misaligned addresses
Yi reported[1] that after commit a3619190d62e ("libnvdimm/pfn: stop
padding pmem namespaces to section alignment"), it was no longer
possible to create a device dax namespace with a 1G alignment. The
reason was that the pmem region was not itself 1G-aligned. The code
happily skips past the first 512M, but fails to account for a now
misaligned end offset (since space was allocated starting at that
misaligned address, and extending for size GBs). Reintroduce
end_trunc, so that the code correctly handles the misaligned end
address. This results in the same behavior as before the introduction
of the offending commit.
[1] https://lists.01.org/pipermail/linux-nvdimm/2019-July/022813.html
Fixes: a3619190d62e ("libnvdimm/pfn: stop padding pmem namespaces ...")
Reported-and-tested-by: Yi Zhang <yi.zh...@redhat.com>
Signed-off-by: Jeff Moyer <jmo...@redhat.com>
Link:
https://lore.kernel.org/r/x49ftll8f39....@segfault.boston.devel.redhat.com
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
So marking kernel as Fix Released (as this is included in Focal).
** Also affects: qemu (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Also affects: linux (Ubuntu Focal)
Importance: Medium
Status: Fix Released
** Also affects: ndctl (Ubuntu Focal)
Importance: Medium
Status: Confirmed
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https://bugs.launchpad.net/bugs/1855177
Title:
QEMU emulated nvdimm regions alignment need (128MB) or ndctl create-
namespace namespace1.0 might fail
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