This is a note to let you know that I've just added the patch titled
mm: disable CONFIG_PER_VMA_LOCK until its fixed
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-disable-config_per_vma_lock-until-its-fixed.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 841878e2ca4600b3ffaf09921cde08f9f944b9f7
Author: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Date: Wed Jul 5 18:14:00 2023 -0700
mm: disable CONFIG_PER_VMA_LOCK until its fixed
[ Upstream commit f96c48670319d685d18d50819ed0c1ef751ed2ac ]
A memory corruption was reported in [1] with bisection pointing to the
patch [2] enabling per-VMA locks for x86. Disable per-VMA locks config to
prevent this issue until the fix is confirmed. This is expected to be a
temporary measure.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=217624
[2] https://lore.kernel.org/all/20230227173632.3292573-30-surenb@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20230706011400.2949242-3-surenb@xxxxxxxxxx
Reported-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/dbdef34c-3a07-5951-e1ae-e9c6e3cdf51b@xxxxxxxxxx/
Reported-by: Jacob Young <jacobly.alt@xxxxxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217624
Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first")
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Holger Hoffstätte <holger@xxxxxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/mm/Kconfig b/mm/Kconfig
index e3454087fd31a..1d2afc2567d0e 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1198,8 +1198,9 @@ config ARCH_SUPPORTS_PER_VMA_LOCK
def_bool n
config PER_VMA_LOCK
- def_bool y
+ bool "Enable per-vma locking during page fault handling."
depends on ARCH_SUPPORTS_PER_VMA_LOCK && MMU && SMP
+ depends on BROKEN
help
Allow per-vma locking during page fault handling.
