From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23A2E30ACF6; Sat, 12 Sep 2026 17:10:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789233035; cv=none; b=kThV6D/7tQZKY5pZRVkHOLmcdhwhqzFi5EXZn6TTVvJWN5kaQV7WYhYOmzrUZKIxo60b/fOo1VtZy27wGEVM/GRDWbaxumwSknbFM11ucoVKPix+RZY4NDOwaCoQUEMN1AvSudDpXGijGnLoLWsPGdJOG0vu05vcy1wn5rr9044= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789233035; c=relaxed/simple; bh=8Vrr517ZJTxCQUTsaIxktO4UXfkpQ0Q4bjsUv/ZiRrg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u/+gB0QVxrFVEf1paTIToMrDS4KXFkaHUics17EUPHM0ClrJyVbsW8XNnswgl5DZznpT5NAXTJrUB3/lvNYKoJ/SBeTPo6viUTM3S1nwjU5yzP4mo0hS2MtHgWFjqCYfMd71z7PDUPafycVxI38kYYjT0gi9kIEH2DZxQIGIbCo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PvuMvU2N; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="PvuMvU2N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF4EA1F000FF; Sat, 12 Sep 2026 17:10:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789233033; bh=xC0LQ1v10MOVY6NkCh7bOkzfUaLgR9JXu+BQyo8aU/s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PvuMvU2N8eTn5nAEcEO3p1sUcgcQfNt8No2/Y38KRPNk3wpKZ1RxmmiIuv/qNbJtn RatPYnupV8OHeHpfli4zKS1sAEFrrwRscgH1fYN47ELqpJINveOXZcLsX2X76kUsis Pf/1NvNJairnQTXtdyegsVD4xg6Wm6p0vFzaxSCY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Joseph Qi , Changwei Ge , Heming Zhao , Joel Becker , Jun Piao , Junxiao Bi , Mark Fasheh , Andrew Morton Subject: [PATCH 5.15 133/935] ocfs2: cluster: avoid lock order inversion in o2hb_region_pin() from drop_item Date: Sat, 12 Sep 2026 08:52:43 +0200 Message-ID: <20260912065529.874506921@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joseph Qi commit cd789996db3c87427343f54f509d17810bd7ba7c upstream. o2hb_heartbeat_group_drop_item() is called from configfs rmdir with the parent directory's inode_lock held. It calls o2hb_region_pin() -> o2nm_depend_item() -> configfs_depend_item(), which acquires the configfs root inode_lock. This creates a parent -> root inode_lock nesting that could deadlock against paths taking root -> parent (e.g. subsystem unregistration). Fix this by using configfs_depend_item_unlocked() when o2hb_region_pin() is called from a configfs callback context. This variant skips the root inode_lock when caller and target are in the same subsystem, which is safe because VFS already holds a lock preventing unregistration. Add o2nm_depend_item_unlocked() wrapper and a from_callback parameter to o2hb_region_pin() to select the appropriate variant. Link: https://lore.kernel.org/20260722124933.430554-3-joseph.qi@linux.alibaba.com Fixes: 58a3158a5d17 ("ocfs2/cluster: Pin/unpin o2hb regions") Signed-off-by: Joseph Qi Cc: Changwei Ge Cc: Heming Zhao Cc: Joel Becker Cc: Jun Piao Cc: Junxiao Bi Cc: Mark Fasheh Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- fs/ocfs2/cluster/heartbeat.c | 17 ++++++++++------- fs/ocfs2/cluster/nodemanager.c | 6 ++++++ fs/ocfs2/cluster/nodemanager.h | 1 + 3 files changed, 17 insertions(+), 7 deletions(-) --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -145,7 +145,7 @@ static unsigned int o2hb_dependent_users * In global heartbeat mode, we pin/unpin all o2hb regions. This solution * works for both file system and userdlm domains. */ -static int o2hb_region_pin(const char *region_uuid); +static int o2hb_region_pin(const char *region_uuid, bool from_callback); static void o2hb_region_unpin(const char *region_uuid); /* Only sets a new threshold if there are no active regions. @@ -2131,7 +2131,7 @@ static void o2hb_heartbeat_group_drop_it if (bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) - o2hb_region_pin(NULL); + o2hb_region_pin(NULL, true); unlock: spin_unlock(&o2hb_live_lock); @@ -2272,7 +2272,7 @@ EXPORT_SYMBOL_GPL(o2hb_setup_callback); * In local, we only pin the matching region. In global we pin all the active * regions. */ -static int o2hb_region_pin(const char *region_uuid) +static int o2hb_region_pin(const char *region_uuid, bool from_callback) { int ret = 0, found; struct o2hb_region *reg, *pinned; @@ -2327,7 +2327,10 @@ static int o2hb_region_pin(const char *r spin_unlock(&o2hb_live_lock); /* Ignore ENOENT only for local hb (userdlm domain) */ - ret = o2nm_depend_item(&pinned->hr_item); + if (from_callback) + ret = o2nm_depend_item_unlocked(&pinned->hr_item); + else + ret = o2nm_depend_item(&pinned->hr_item); spin_lock(&o2hb_live_lock); if (!ret) { @@ -2425,8 +2428,8 @@ static int o2hb_region_inc_user(const ch /* local heartbeat */ if (!o2hb_global_heartbeat_active()) { - ret = o2hb_region_pin(region_uuid); - goto unlock; + ret = o2hb_region_pin(region_uuid, false); + goto unlock; } /* @@ -2439,7 +2442,7 @@ static int o2hb_region_inc_user(const ch if (bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) - ret = o2hb_region_pin(NULL); + ret = o2hb_region_pin(NULL, false); unlock: spin_unlock(&o2hb_live_lock); --- a/fs/ocfs2/cluster/nodemanager.c +++ b/fs/ocfs2/cluster/nodemanager.c @@ -776,6 +776,12 @@ int o2nm_depend_item(struct config_item return configfs_depend_item(&o2nm_cluster_group.cs_subsys, item); } +int o2nm_depend_item_unlocked(struct config_item *item) +{ + return configfs_depend_item_unlocked(&o2nm_cluster_group.cs_subsys, + item); +} + void o2nm_undepend_item(struct config_item *item) { configfs_undepend_item(item); --- a/fs/ocfs2/cluster/nodemanager.h +++ b/fs/ocfs2/cluster/nodemanager.h @@ -64,6 +64,7 @@ void o2nm_node_get(struct o2nm_node *nod void o2nm_node_put(struct o2nm_node *node); int o2nm_depend_item(struct config_item *item); +int o2nm_depend_item_unlocked(struct config_item *item); void o2nm_undepend_item(struct config_item *item); int o2nm_depend_this_node(void); void o2nm_undepend_this_node(void);