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 C73B24E80DD; Wed, 16 Sep 2026 11:07:36 +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=1789556867; cv=none; b=fGbLdHEMIdUQUZBEFo565aj48sUCFIjz0j6rOk8iFLnx21zmtBKpKOU84vjmh8v94sM1oF7+5kqiG421GDwz4b9R+xvZVqVUbH6PJhrfZnzvEF50eqQt+dU7IudZUO+hONBddobel9PMkfYiZPrXCTyA6XN3b5uRM8SK/S/YJRQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789556867; c=relaxed/simple; bh=s2Y8FHl5pad2JXrMEcI+IO41iYjxfJC9s5kMq8AS9gs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Cvut2sY/tMkiKvtaDfTbMY3jik3t0Giqo/iaBJ/AQkIKFvC81FT378Qg5xvy2aWzH9XF2suekdwxv2t45x7TU5d27W/SOAVxWrPYGFqmdvL0hqn3K+ECmx5Z3jgSq2zWUdph07CAd9cMUu456A0w79mfbjUMkUYaq27i2ZUWQ+0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VTEsINa2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VTEsINa2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18AA31F00893; Wed, 16 Sep 2026 11:07:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789556854; bh=bs+upltXBSfzi2cwzUqhfJ6FPdIoXvrWqG+jJg+gVXM=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=VTEsINa2F1VsHRKrr/U/51hnfEYjvbpG9J0WgfIigy5Jtw23slJDE125eFA7ISd+u OTtTMFs7B55cGFJ1wor1ydXar802KL3+8mbjDWYZdACbSbuR4rwrjCNCn0SF8N3hoP sJfGaoyYo7EazfbtgkZNL7i7cQlAnyn78VmKhQWLImFVyF14tex3hKRjTVcpbbCG0V Qqok0JQyHLbJbMRu2JT5Emlj69WcAKq5z/8/66NJ5asn1JF3dR7lNxmp7qBAEeSu6w ZD69rOjcJBnxvNt171QmNaTnoORjV9uhw9U9x2ynC8fLSTu8WeK8qbxMP5c75j580D YbRKiHWdT8stA== Message-ID: Subject: Re: [PATCH] lockd: Fix host reference leak in nlmclnt_recovery() From: Jeff Layton To: Wentao Liang , Dai.Ngo@oracle.com Cc: anna@kernel.org, chuck.lever@oracle.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, neil@brown.name, okorniev@redhat.com, tom@talpey.com, trondmy@kernel.org, stable@vger.kernel.org Date: Wed, 16 Sep 2026 07:07:32 -0400 In-Reply-To: <20260916074034.1972173-1-vulab@iscas.ac.cn> References: <20260916074034.1972173-1-vulab@iscas.ac.cn> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Wed, 2026-09-16 at 07:40 +0000, Wentao Liang wrote: > In nlmclnt_recovery(), nlm_get_host(host) is called to take a reference > on the host before spawning the reclaimer thread via kthread_run(). If > kthread_run() fails, the reference is never released, and > host->h_reclaiming remains incremented, preventing subsequent reclaim > attempts. >=20 > Fix this by releasing the host reference with nlmclnt_release_host(host) > and resetting host->h_reclaiming to 0 on kthread_run() error. >=20 > Fixes: df94f000c46c ("lockd: convert reclaimer thread to kthread interfac= e") > Cc: stable@vger.kernel.org > Signed-off-by: Wentao Liang > --- > fs/lockd/clntlock.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c > index 8fa30c42c92a..aba37847356c 100644 > --- a/fs/lockd/clntlock.c > +++ b/fs/lockd/clntlock.c > @@ -216,10 +216,13 @@ nlmclnt_recovery(struct nlm_host *host) > if (!host->h_reclaiming++) { > nlm_get_host(host); > task =3D kthread_run(reclaimer, host, "%s-reclaim", host->h_name); > - if (IS_ERR(task)) > + if (IS_ERR(task)) { > printk(KERN_ERR "lockd: unable to spawn reclaimer " > "thread. Locks for %s won't be reclaimed! " > "(%ld)\n", host->h_name, PTR_ERR(task)); > + host->h_reclaiming =3D 0; > + nlmclnt_release_host(host); > + } > } > } > =20 Good catch! Reviewed-by: Jeff Layton