** Information type changed from Proprietary to Public
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Status: New => Fix Released
** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1704323
Title:
[Bug] Crystal Ridge - 4.12 - libnvdimm, pfn: fix 'npfns' vs section
alignment
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Fix Released
Bug description:
Description:
Fix failures to create namespaces due to the vmem_altmap not advertising
enough free space to store the memmap.
WARNING: CPU: 15 PID: 8022 at arch/x86/mm/init_64.c:656
arch_add_memory+0xde/0xf0
[..]
Call Trace:
dump_stack+0x63/0x83
__warn+0xcb/0xf0
warn_slowpath_null+0x1d/0x20
arch_add_memory+0xde/0xf0
devm_memremap_pages+0x244/0x440
pmem_attach_disk+0x37e/0x490 [nd_pmem]
nd_pmem_probe+0x7e/0xa0 [nd_pmem]
nvdimm_bus_probe+0x71/0x120 [libnvdimm]
driver_probe_device+0x2bb/0x460
bind_store+0x114/0x160
drv_attr_store+0x25/0x30
In commit 658922e57b84 "libnvdimm, pfn: fix memmap reservation sizing"
we arranged for the capacity to be allocated, but failed to also update
the 'npfns' parameter. This leads to cases where there is enough
capacity reserved to hold all the allocated sections, but
vmemmap_populate_hugepages() still encounters -ENOMEM from
altmap_alloc_block_buf().
This fix is a stop-gap until we can teach the core memory hotplug
implementation to permit sub-section hotplug.
Target Kernel:4.12
Target Release: 17.10
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