+ fault-inject-fix-boot-failure-with-fault-injection-boot-parameters.patch added to mm-nonmm-hotfixes-unstable branch

+ fault-inject-fix-boot-failure-with-fault-injection-boot-parameters.patch added to mm-nonmm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: fault-inject: fix boot failure with fault injection boot parameters
has been added to the -mm mm-nonmm-hotfixes-unstable branch.  Its filename is
     fault-inject-fix-boot-failure-with-fault-injection-boot-parameters.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fault-inject-fix-boot-failure-with-fault-injection-boot-parameters.patch

This patch will later appear in the mm-nonmm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Sang-Heon Jeon <ekffu200098@gmail.com>
Subject: fault-inject: fix boot failure with fault injection boot parameters
Date: Fri,  6 Nov 2026 01:01:58 +0900

Since commit e9bc360b105c ("fault-inject: use prandom where
cryptographically secure randomness is not needed"), setup_fault_attr()
calls prandom_init_once(), which calls kmalloc() and schedule_work().

But setup_fault_attr() can be called from __setup handlers before slab and
workqueues are initialized, so any fault injection boot parameter leads to
boot failure.

So use DO_ONCE_LITE() instead.

Link: https://lore.kernel.org/20261105160209.1504867-1-ekffu200098@gmail.com
Fixes: e9bc360b105c ("fault-inject: use prandom where cryptographically secure randomness is not needed")
Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <stable@vger.kernel.org>
---

 lib/fault-inject.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/lib/fault-inject.c~fault-inject-fix-boot-failure-with-fault-injection-boot-parameters
+++ a/lib/fault-inject.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/once_lite.h>
 #include <linux/prandom.h>
 #include <linux/debugfs.h>
 #include <linux/sched.h>
@@ -50,7 +51,12 @@ int setup_fault_attr(struct fault_attr *
 		return 0;
 	}
 
-	prandom_init_once(&fault_rnd_state);
+	/*
+	 * __setup handlers run before slab and workqueues are initialized,
+	 * but prandom_init_once() calls kmalloc() and schedule_work(). So use
+	 * DO_ONCE_LITE() instead.
+	 */
+	DO_ONCE_LITE(prandom_seed_full_state, &fault_rnd_state);
 
 	attr->probability = probability;
 	attr->interval = interval;
_

Patches currently in -mm which might be from ekffu200098@gmail.com are

mm-memory-remove-unused-vmf_insert_mixed_mkwrite.patch
mm-memory-remove-the-mkwrite-argument-from-__vm_insert_mixed.patch
mm-memory-merge-__vm_insert_mixed-into-vmf_insert_mixed.patch
fault-inject-fix-boot-failure-with-fault-injection-boot-parameters.patch