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 A6F7A4AF9D9 for ; Thu, 3 Sep 2026 13:39:45 +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=1788442800; cv=none; b=bvIenqI5FZHG+KpmXCdNy/pIg8x5uxPVoWx+J4ECvJ8biILMEIX+PT+W66ajpvJmDOU6tubInpDqOGM1zUYtx6aJVdZ8k+uyACgvnySuxlDN5W8Sa7bmccAJrwc9oh+Ej3p2BQioPSNhIR91zy/c93h6zZh1g6/wMNerUU1jVUI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788442800; c=relaxed/simple; bh=VH67p9QHeLpcjO56ucxx0sCBCNAGMRzwb4HGWFnUUPs=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=MNcfoADgQp1UAU2LiCMv2Szl+dsKuovb8JnpevlbU6Xd6ld1OwoQwRqrWqqZZUhCLTaS0GP3mr2rGG0YsfIO/FFD0I+Y+FTgd3mpCfMr7FAxVcK3U+C+xsAhKCFL3gsUu9ANPoNgRCHYVxHWjFgw5Arg1QJgQDoFBZyNnD01FrE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PGfmKpiO; 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="PGfmKpiO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6CAB1F00ADE; Thu, 3 Sep 2026 13:39:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788442785; bh=KuOCvp9fHXEkFp/0c7B/2rQ5y04Ls1BArZS7BhLazeQ=; h=Subject:To:Cc:From:Date; b=PGfmKpiOaoB8xMWdPwDS911Fpp9SdAnoUpqSRm1ILTj3/1DV9u19RbeOlzXtL7YaQ 7RhRIDI3PpukDxQg/Hyh0qAumhk3n+bTYo1lTA03mHO1FQ6QAEn28rfseRZuh2pJP0 veU1kHdsB4Iz/y1y6KjLT2/nkPw8LEAcBgrRsUbc= Subject: FAILED: patch "[PATCH] nfsd: fix clock domain mismatch in clients_still_reclaiming()" failed to apply to 6.6-stable tree To: jlayton@kernel.org,cel@kernel.org Cc: From: Date: Thu, 03 Sep 2026 15:13:15 +0200 Message-ID: <2026090315-grew-sinner-ab84@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-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 . 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-6.6.y git checkout FETCH_HEAD git cherry-pick -x 09ea3eb9a518565f5bca386e81b993ed8825f5e8 # git commit -s git send-email --to '' --in-reply-to '2026090315-grew-sinner-ab84@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 09ea3eb9a518565f5bca386e81b993ed8825f5e8 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Thu, 11 Jun 2026 16:00:55 -0400 Subject: [PATCH] nfsd: fix clock domain mismatch in clients_still_reclaiming() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit clients_still_reclaiming() computes a deadline from nn->boot_time (CLOCK_REALTIME, ~1.7 billion) but compares it against ktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot). The comparison is always false — it would take ~54 years of uptime for BOOTTIME to exceed the REALTIME-derived deadline. This means any client can hold the server in grace indefinitely by sending CLAIM_PREVIOUS OPEN requests, blocking all non-reclaim operations for all other clients. Add boot_time_bt (CLOCK_BOOTTIME) alongside the existing boot_time and use it for the deadline computation. boot_time (CLOCK_REALTIME) is preserved for its cl_boot clientid-nonce role. Fixes: 20b7d86f29d3 ("nfsd: use boottime for lease expiry calculation") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Jeff Layton Link: https://patch.msgid.link/20260611-nfsd-testing-v2-12-5b90e276f2d9@kernel.org Signed-off-by: Chuck Lever diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index 5c33c96da28e..03724bef10a7 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -78,6 +78,7 @@ struct nfsd_net { struct lock_manager nfsd4_manager; unsigned long flags; time64_t boot_time; + time64_t boot_time_bt; /* same instant in CLOCK_BOOTTIME */ struct dentry *nfsd_client_dir; diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 3dc0c0f6eb5d..17cb3b0ad956 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6870,7 +6870,7 @@ bool nfsd4_force_end_grace(struct nfsd_net *nn) */ static bool clients_still_reclaiming(struct nfsd_net *nn) { - time64_t double_grace_period_end = nn->boot_time + + time64_t double_grace_period_end = nn->boot_time_bt + 2 * nn->nfsd4_lease; if (test_bit(NFSD_NET_GRACE_END_FORCED, &nn->flags)) @@ -9245,6 +9245,7 @@ static int nfs4_state_create_net(struct net *net) nn->conf_name_tree = RB_ROOT; nn->unconf_name_tree = RB_ROOT; nn->boot_time = ktime_get_real_seconds(); + nn->boot_time_bt = ktime_get_boottime_seconds(); clear_bit(NFSD_NET_GRACE_ENDED, &nn->flags); clear_bit(NFSD_NET_GRACE_END_FORCED, &nn->flags); nn->nfsd4_manager.block_opens = true;