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Filename Latest commit message Latest commit date
Mike Rapoport (IBM) cfe13e1486 x86/mm: Drop the 4 MB restriction on minimal NUMA node memory size 
[ Upstream commit a1e2b8b36820d8c91275f207e77e91645b7c6836 ]

Qi Zheng reported crashes in a production environment and provided a
simplified example as a reproducer:

 |  For example, if we use Qemu to start a two NUMA node kernel,
 |  one of the nodes has 2M memory (less than NODE_MIN_SIZE),
 |  and the other node has 2G, then we will encounter the
 |  following panic:
 |
 |    BUG: kernel NULL pointer dereference, address: 0000000000000000
 |    <...>
 |    RIP: 0010:_raw_spin_lock_irqsave+0x22/0x40
 |    <...>
 |    Call Trace:
 |      <TASK>
 |      deactivate_slab()
 |      bootstrap()
 |      kmem_cache_init()
 |      start_kernel()
 |      secondary_startup_64_no_verify()

The crashes happen because of inconsistency between the nodemask that
has nodes with less than 4MB as memoryless, and the actual memory fed
into the core mm.

The commit:

  9391a3f9c7 ("[PATCH] x86_64: Clear more state when ignoring empty node in SRAT parsing")

... that introduced minimal size of a NUMA node does not explain why
a node size cannot be less than 4MB and what boot failures this
restriction might fix.

Fixes have been submitted to the core MM code to tighten up the
memory topologies it accepts and to not crash on weird input:

  mm: page_alloc: skip memoryless nodes entirely
  mm: memory_hotplug: drop memoryless node from fallback lists

Andrew has accepted them into the -mm tree, but there are no
stable SHA1's yet.

This patch drops the limitation for minimal node size on x86:

  - which works around the crash without the fixes to the core MM.
  - makes x86 topologies less weird,
  - removes an arbitrary and undocumented limitation on NUMA topologies.

[ mingo: Improved changelog clarity. ]

Reported-by: Qi Zheng <zhengqi.arch@bytedance.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Rik van Riel <riel@surriel.com>
Link: https://lore.kernel.org/r/ZS+2qqjEO5/867br@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-11-28 16:50:13 +00:00
arch x86/mm: Drop the 4 MB restriction on minimal NUMA node memory size 2023-11-28 16:50:13 +00:00
block
certs
crypto X.509: if signature is unsupported skip validation 2023-09-23 10:59:55 +02:00
Documentation firmware: ti_sci: Replace HTTP links with HTTPS ones 2023-11-20 10:30:12 +01:00
drivers clocksource/drivers/timer-atmel-tcb: Fix initialization on SAM9 hardware 2023-11-28 16:50:13 +00:00
fs btrfs: use u64 for buffer sizes in the tree search ioctls 2023-11-20 10:30:16 +01:00
include netfilter: nft_redir: use struct nf_nat_range2 throughout and deduplicate eval call-backs 2023-11-20 10:30:16 +01:00
init
ipc
kernel perf/core: Bail out early if the request AUX area is out of bound 2023-11-28 16:50:13 +00:00
lib kobject: Fix slab-out-of-bounds in fill_kobj_path() 2023-11-08 11:23:38 +01:00
LICENSES
mm vfs: fix readahead(2) on block devices 2023-11-20 10:30:08 +01:00
net netfilter: nat: fix ipv6 nat redirect with mapped and scoped addresses 2023-11-20 10:30:16 +01:00
samples
scripts modpost: fix tee MODULE_DEVICE_TABLE built on big-endian host 2023-11-20 10:30:14 +01:00
security ima: rework CONFIG_IMA dependency block 2023-10-10 21:46:46 +02:00
sound ASoC: ams-delta.c: use component after check 2023-11-20 10:30:13 +01:00
tools tools: iio: iio_generic_buffer ensure alignment 2023-11-20 10:30:14 +01:00
usr
virt
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Makefile Linux 5.4.261 2023-11-20 10:30:17 +01:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.