linux-kernel - [PATCH v3 2/2] mm: disable CONFIG_PER_VMA

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Date:   Wed,  5 Jul 2023 10:12:12 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     jirislaby@...nel.org, jacobly.alt@...il.com,
        holger@...lied-asynchrony.com, hdegoede@...hat.com,
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        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: [PATCH v3 2/2] mm: disable CONFIG_PER_VMA_LOCK until its fixed

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 while the problem is
being investigated. 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@google.com

Reported-by: Jiri Slaby <jirislaby@...nel.org>
Closes: https://lore.kernel.org/all/dbdef34c-3a07-5951-e1ae-e9c6e3cdf51b@kernel.org/
Reported-by: Jacob Young <jacobly.alt@...il.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217624
Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first")
Cc: stable@...r.kernel.org
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 mm/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 09130434e30d..0abc6c71dd89 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1224,8 +1224,9 @@ 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.
 
-- 
2.41.0.255.g8b1d071c50-goog