FAILED: patch "[PATCH] ext4: fix dirtyclusters double decrement on fs shutdown" failed to apply to 5.15-stable tree

PATCH New [email protected] 2 participants 2 messages Feb 24 – Feb 25

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Stable branch ext4 file system

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lore

[email protected]

author maintainer

2026-02-24 21:45 UTC #0 lore raw

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 94a8cea54cd935c54fa2fba70354757c0fc245e3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026022422-deviancy-scanning-ca65@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 94a8cea54cd935c54fa2fba70354757c0fc245e3 Mon Sep 17 00:00:00 2001
From: Brian Foster <[email protected]>
Date: Tue, 13 Jan 2026 12:19:05 -0500
Subject: [PATCH] ext4: fix dirtyclusters double decrement on fs shutdown

fstests test generic/388 occasionally reproduces a warning in ext4_put_super() associated with the dirty clusters count:

  WARNING: CPU: 7 PID: 76064 at fs/ext4/super.c:1324 ext4_put_super+0x48c/0x590 [ext4]

Tracing the failure shows that the warning fires due to an s_dirtyclusters_counter value of -1. IOW, this appears to be a spurious decrement as opposed to some sort of leak. Further tracing of the dirty cluster count deltas and an LLM scan of the resulting output identified the cause as a double decrement in the error path between ext4_mb_mark_diskspace_used() and the caller ext4_mb_new_blocks().

First, note that generic/388 is a shutdown vs. fsstress test and so produces a random set of operations and shutdown injections. In the problematic case, the shutdown triggers an error return from the ext4_handle_dirty_metadata() call(s) made from ext4_mb_mark_context(). The changed value is non-zero at this point, so ext4_mb_mark_diskspace_used() does not exit after the error bubbles up from ext4_mb_mark_context(). Instead, the former decrements both cluster counters and returns the error up to ext4_mb_new_blocks(). The latter falls into the !ar->len out path which decrements the dirty clusters counter a second time, creating the inconsistency.

To avoid this problem and simplify ownership of the cluster reservation in this codepath, lift the counter reduction to a single place in the caller. This makes it more clear that ext4_mb_new_blocks() is responsible for acquiring cluster reservation (via ext4_claim_free_clusters()) in the !delalloc case as well as releasing it, regardless of whether it ends up consumed or returned due to failure.

Fixes 0087d9fb3f29 ("ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc")

Signed-off-by Brian Foster <[email protected]>

Reviewed-by Baokun Li <[email protected]>

Link https://patch.msgid.link/[email protected] open here

Signed-off-by Theodore Ts'o <[email protected]>

Cc [email protected]

fs/ext4/mballoc-test.c +1 -1

index a9416b20ff64..4abb40d4561c 100644
@@ -567,7 +567,7 @@ test_mark_diskspace_used_range(struct kunit *test,
 
 	bitmap = mbt_ctx_bitmap(sb, TEST_GOAL_GROUP);
 	memset(bitmap, 0, sb->s_blocksize);
-	ret = ext4_mb_mark_diskspace_used(ac, NULL, 0);
+	ret = ext4_mb_mark_diskspace_used(ac, NULL);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
 	max = EXT4_CLUSTERS_PER_GROUP(sb);

fs/ext4/mballoc.c +5 ~~-16~~

index de4cacb740b3..dd29558ad753 100644
@@ -4186,8 +4186,7 @@ ext4_mb_mark_context(handle_t *handle, struct super_block *sb, bool state,
  * Returns 0 if success or error code
  */
 static noinline_for_stack int
-ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
-				handle_t *handle, unsigned int reserv_clstrs)
+ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, handle_t *handle)
 {
 	struct ext4_group_desc *gdp;
 	struct ext4_sb_info *sbi;

@@ -4242,13 +4241,6 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
 	BUG_ON(changed != ac->ac_b_ex.fe_len);
 #endif
 	percpu_counter_sub(&sbi->s_freeclusters_counter, ac->ac_b_ex.fe_len);
-	/*
-	 * Now reduce the dirty block count also. Should not go negative
-	 */
-	if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED))
-		/* release all the reserved blocks if non delalloc */
-		percpu_counter_sub(&sbi->s_dirtyclusters_counter,
-				   reserv_clstrs);
 
 	return err;
 }

@@ -6333,7 +6325,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 			ext4_mb_pa_put_free(ac);
 	}
 	if (likely(ac->ac_status == AC_STATUS_FOUND)) {
-		*errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs);
+		*errp = ext4_mb_mark_diskspace_used(ac, handle);
 		if (*errp) {
 			ext4_discard_allocated_blocks(ac);
 			goto errout;

@@ -6364,12 +6356,9 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 out:
 	if (inquota && ar->len < inquota)
 		dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len));
-	if (!ar->len) {
-		if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0)
-			/* release all the reserved blocks if non delalloc */
-			percpu_counter_sub(&sbi->s_dirtyclusters_counter,
-						reserv_clstrs);
-	}
+	/* release any reserved blocks */
+	if (reserv_clstrs)
+		percpu_counter_sub(&sbi->s_dirtyclusters_counter, reserv_clstrs);
 
 	trace_ext4_allocate_blocks(ar, (unsigned long long)block);

Sasha Levin

maintainer

2026-02-25 14:52 UTC #1 lore raw

PATCH 1/1 ext4: fix dirtyclusters double decrement on fs shutdown

From: Brian Foster <[email protected]>

[ Upstream commit 94a8cea54cd935c54fa2fba70354757c0fc245e3 ]