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+Date: Wed, 14 Jan 2026 17:49:30 +0000
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+To: linux-kernel@vger.kernel.org
+Cc: linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev,
+ dan.j.williams@intel.com, willy@infradead.org, jack@suse.cz,
+ Nick.Connolly@arm.com, ffidencio@nvidia.com
+From: Seunguk Shin <seunguk.shin@arm.com>
+Subject: [PATCH] fs/dax: check zero or empty entry before converting xarray
+Content-Type: text/plain; charset=UTF-8; format=flowed
+Content-Transfer-Encoding: 8bit
+
+Trying to convert zero or empty xarray entry causes kernel panic.
+
+[    0.737679] EXT4-fs (pmem0p1): mounted filesystem 
+79676804-7c8b-491a-b2a6-9bae3c72af70 ro with ordered data mode. Quota 
+mode: disabled.
+[    0.737891] VFS: Mounted root (ext4 filesystem) readonly on device 259:1.
+[    0.739119] devtmpfs: mounted
+[    0.739476] Freeing unused kernel memory: 1920K
+[    0.740156] Run /sbin/init as init process
+[    0.740229]   with arguments:
+[    0.740286]     /sbin/init
+[    0.740321]   with environment:
+[    0.740369]     HOME=/
+[    0.740400]     TERM=linux
+[    0.743162] Unable to handle kernel paging request at virtual address 
+fffffdffbf000008
+[    0.743285] Mem abort info:
+[    0.743316]   ESR = 0x0000000096000006
+[    0.743371]   EC = 0x25: DABT (current EL), IL = 32 bits
+[    0.743444]   SET = 0, FnV = 0
+[    0.743489]   EA = 0, S1PTW = 0
+[    0.743545]   FSC = 0x06: level 2 translation fault
+[    0.743610] Data abort info:
+[    0.743656]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
+[    0.743720]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
+[    0.743785]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
+[    0.743848] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000b9d17000
+[    0.743931] [fffffdffbf000008] pgd=10000000bfa3d403, 
+p4d=10000000bfa3d403, pud=1000000040bfe403, pmd=0000000000000000
+[    0.744070] Internal error: Oops: 0000000096000006 [#1]  SMP
+[    0.748888] CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.18.4 #1 NONE
+[    0.749421] pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS 
+BTYPE=--)
+[    0.749969] pc : dax_disassociate_entry.constprop.0+0x20/0x50
+[    0.750444] lr : dax_insert_entry+0xcc/0x408
+[    0.750802] sp : ffff80008000b9e0
+[    0.751083] x29: ffff80008000b9e0 x28: 0000000000000000 x27: 
+0000000000000000
+[    0.751682] x26: 0000000001963d01 x25: ffff0000004f7d90 x24: 
+0000000000000000
+[    0.752264] x23: 0000000000000000 x22: ffff80008000bcc8 x21: 
+0000000000000011
+[    0.752836] x20: ffff80008000ba90 x19: 0000000001963d01 x18: 
+0000000000000000
+[    0.753407] x17: 0000000000000000 x16: 0000000000000000 x15: 
+0000000000000000
+[    0.753970] x14: ffffbf3154b9ae70 x13: 0000000000000000 x12: 
+ffffbf3154b9ae70
+[    0.754548] x11: ffffffffffffffff x10: 0000000000000000 x9 : 
+0000000000000000
+[    0.755122] x8 : 000000000000000d x7 : 000000000000001f x6 : 
+0000000000000000
+[    0.755707] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 
+fffffdffc0000000
+[    0.756287] x2 : 0000000000000008 x1 : 0000000040000000 x0 : 
+fffffdffbf000000
+[    0.756871] Call trace:
+[    0.757107]  dax_disassociate_entry.constprop.0+0x20/0x50 (P)
+[    0.757592]  dax_iomap_pte_fault+0x4fc/0x808
+[    0.757951]  dax_iomap_fault+0x28/0x30
+[    0.758258]  ext4_dax_huge_fault+0x80/0x2dc
+[    0.758594]  ext4_dax_fault+0x10/0x3c
+[    0.758892]  __do_fault+0x38/0x12c
+[    0.759175]  __handle_mm_fault+0x530/0xcf0
+[    0.759518]  handle_mm_fault+0xe4/0x230
+[    0.759833]  do_page_fault+0x17c/0x4dc
+[    0.760144]  do_translation_fault+0x30/0x38
+[    0.760483]  do_mem_abort+0x40/0x8c
+[    0.760771]  el0_ia+0x4c/0x170
+[    0.761032]  el0t_64_sync_handler+0xd8/0xdc
+[    0.761371]  el0t_64_sync+0x168/0x16c
+[    0.761677] Code: f9453021 f2dfbfe3 cb813080 8b001860 (f9400401)
+[    0.762168] ---[ end trace 0000000000000000 ]---
+[    0.762550] note: init[1] exited with irqs disabled
+[    0.762631] Kernel panic - not syncing: Attempted to kill init! 
+exitcode=0x0000000b
+
+This patch just reorders checking and converting.
+
+Signed-off-by: Seunguk Shin <seunguk.shin@arm.com>
+---
+ fs/dax.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/fs/dax.c b/fs/dax.c
+index 516f995a9..69ac2562c 100644
+--- a/fs/dax.c
++++ b/fs/dax.c
+@@ -443,11 +443,12 @@ static void dax_associate_entry(void *entry, struct address_space *mapping,
+ 				unsigned long address, bool shared)
+ {
+ 	unsigned long size = dax_entry_size(entry), index;
+-	struct folio *folio = dax_to_folio(entry);
++	struct folio *folio;
+ 
+ 	if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry))
+ 		return;
+ 
++	folio = dax_to_folio(entry);
+ 	index = linear_page_index(vma, address & ~(size - 1));
+ 	if (shared && (folio->mapping || dax_folio_is_shared(folio))) {
+ 		if (folio->mapping)
+@@ -468,21 +469,23 @@ static void dax_associate_entry(void *entry, struct address_space *mapping,
+ static void dax_disassociate_entry(void *entry, struct address_space *mapping,
+ 				bool trunc)
+ {
+-	struct folio *folio = dax_to_folio(entry);
++	struct folio *folio;
+ 
+ 	if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry))
+ 		return;
+ 
++	folio = dax_to_folio(entry);
+ 	dax_folio_put(folio);
+ }
+ 
+ static struct page *dax_busy_page(void *entry)
+ {
+-	struct folio *folio = dax_to_folio(entry);
++	struct folio *folio;
+ 
+ 	if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry))
+ 		return NULL;
+ 
++	folio = dax_to_folio(entry);
+ 	if (folio_ref_count(folio) - folio_mapcount(folio))
+ 		return &folio->page;
+ 	else
+-- 
+2.43.0
+
@@ -0,0 +1,8 @@
+The ebpf build type has no kernel source patches of its own.
+
+The eBPF/BTF tracing stack is enabled entirely through config fragments
+(see packaging/kernel/build-type/ebpf), not source patches. Version-level
+patches in the parent directory (6.18.x/) still apply to this build type.
+
+This file exists so apply_patches.sh finds a directory here and treats it
+as "no patches to apply" instead of failing. See packaging/scripts/apply_patches.sh.
@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2020 Red Hat, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# This script apply patches.
+#
+set -e
+
+# shellcheck disable=SC2034
+script_dir="$(realpath "$(dirname "$0")")"
+patches_dir="$1"
+
+if [[ -z "${patches_dir}" ]]; then
+	cat <<-EOF
+	Apply patches to the sources at the current directory.
+
+	Patches are expected to be named in the standard git-format-patch(1) format where
+	the first part of the filename represents the patch ordering (lowest numbers
+	apply first):
+	    'NUMBER-DASHED_DESCRIPTION.patch'
+
+	For example,
+
+	    0001-fix-the-bad-thing.patch
+	    0002-improve-the-fix-the-bad-thing-fix.patch
+	    0003-correct-compiler-warnings.patch
+
+	Usage:
+	    $0 PATCHES_DIR
+	Where:
+	    PATCHES_DIR is the directory containing the patches
+	EOF
+	exit 1
+fi
+
+echo "INFO: Apply patches from ${patches_dir}"
+if [[ -d "${patches_dir}" ]]; then
+	mapfile -t patches < <(find "${patches_dir}" -maxdepth 1 -name '*.patch'|sort -t- -k1,1n)
+	echo "INFO: Found ${#patches[@]} patches"
+	for patch in "${patches[@]}"; do
+		echo "INFO: Apply ${patch}"
+		patch -p1 < "${patch}" || \
+			{ echo >&2 "ERROR: Not applied. Exiting..."; exit 1; }
+	done
+else
+	echo "INFO: Patches directory does not exist: ${patches_dir}"
+	echo "INFO: Create a ${patches_dir}/no_patches.txt file if the current version has no patches"
+	exit 1;
+fi