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 3C7D847F2C6; Sat, 12 Sep 2026 13:30:13 +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=1789219814; cv=none; b=udO2m6nE7MD1bNYuj3YcnMJr4KdWXpjRHpLtkMS4tgH4/cvY6K1mLUT+ucy8HSFk05LvFGoHElVYT7ta8LtLov4RjLAZdgIOLYZhpxgxZPz7h5SrbT9BCBx402pRlGiJAMzc0AQy7mbGMSniF5ovQ3hA8nrta6xFzKxw6XuZ8Zg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789219814; c=relaxed/simple; bh=ZsfN2omY4DG5SAdvImr4tF0w+22oJGn19lCH+081Ggg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iIRVIktri6t+U2K4demcJtB5DpOxVFAnL4P/tacd/ExINokjPWVLZ+cb9st0Y9WzX9dEaSEvG+SVZrgI6H5S6i8Teth6IfsdVA7lu4G385g7I/nwTaN/8gpXuUA6etIJXqGuUid9CzZfoBU8aVkSwW35ta0920GqAoo6x8gvWKg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dA31ez/v; 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="dA31ez/v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2260F1F000FF; Sat, 12 Sep 2026 13:30:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789219813; bh=VWyYGQdm0bQ+wl+9v1MCYuZnl9QiVWhZ6DnQ1NeNlKs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dA31ez/vjv1aF9DXtpRp0kQ6OI4/M2VavjgIB66N6rdMZreMX05SCRsCH1iga/TrL OLC1kK7WKZKeHyWnmzsDNVrnwUW5qDnLCbdUwn+DskCNbE+Ox5iwRjLbQVa1i+gHce vxJL4V83UqPpK0DaKqsH5J+YoryKIkyrw47q/Kcg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , Trond Myklebust Subject: [PATCH 6.6 0050/1424] NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path Date: Sat, 12 Sep 2026 08:41:22 +0200 Message-ID: <20260912065608.422562862@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo commit ee5a386cfe60f3f8286de16a9db8e1a08f0bc124 upstream. When the server returns a new layout stateid while a valid one is still held, pnfs_layout_process() calls pnfs_mark_matching_lsegs_return() on the on-stack free_me list and jumps to out_forget. Segments whose reference count drops to zero are unlinked from lo->plh_segs and moved to free_me by mark_lseg_invalid(); for an idle cached segment the layout header holds the only reference, so this happens on the first decrement. out_forget never drains free_me -- only the success path calls pnfs_free_lseg_list(). Commit 814b84971388 ("pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()") added the drain; commit 08bd8dbe8882 ("pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()") removed it while switching the destination to lo->plh_return_segs, which is drained elsewhere. Commit fb700ef02676 ("NFSv4.1: Simplify layout return in pnfs_layout_process()") switched the destination back to free_me without restoring the drain. Restore the pnfs_free_lseg_list() call. Fixes: fb700ef02676 ("NFSv4.1: Simplify layout return in pnfs_layout_process()") Reported-by: Yuhao Jiang Assisted-by: Claude:claude-opus-5 Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/pnfs.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -2506,6 +2506,7 @@ out_forget: spin_unlock(&ino->i_lock); lseg->pls_layout = lo; NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); + pnfs_free_lseg_list(&free_me); return ERR_PTR(-EAGAIN); }