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 B78E63AEF2D; Thu, 17 Sep 2026 18:59:52 +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=1789671594; cv=none; b=kOzT0dCPSPxHLwiKcYG+g5BrTAtXXgx4Jv2BXWTDtzeTJY3SQTJxCPxYoBogQqBM26MzwKAzTUhNXCfHS4QDJmy8nUt9At9tu0lzB9j10W7iG9pzqoYa1NA7/rzHRt/WSv789Vzq5bLCpbblo7Y3GPlhBuDjppu31dZ+WG6Qh/k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789671594; c=relaxed/simple; bh=gxcmB8CBC8gze2Z925c3gIpdTtqezX+kOxhCOa8zRMM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=inj65nL0rwmKZ6S+iKE5+DiouslBUdqwB1tAT6IdJYyVU3nIOt8JCzkyudMs9ox0kjaodrwAhk70p6z4dKByJpE6Gzf0ggIIAn+dYJ7tTJlJA5k32DT2L+hv602iox9L12fodCJOVyZfUr9i4cYTE7wry1rEnoJzgsftMxM/LHo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LI1oWWXe; 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="LI1oWWXe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 199091F000FF; Thu, 17 Sep 2026 18:59:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789671592; bh=GkSTqFcifmT1nBp6EmJOOobw+et3DOr/2qR8LI9Da/A=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LI1oWWXeYkAPs56g1HxCHfpk9/IxReKL7oqG/dvuZeZKIRoh9EuQYSkw8h2BoTuEc 9CPdwKovgTa37CU+Z4Hkuz434VTvXLWoMCWCNJs60LB2OmyS8qLsBlpZNlnOVnQkvb A7S7G3dt8QP0XInyDPBoie07ihCtpRnenMMWSiDg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 6.12 1027/1102] nfsd: fix clock domain mismatch in clients_still_reclaiming() Date: Thu, 17 Sep 2026 16:16:10 +0100 Message-ID: <20260917151606.552361979@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151539.408551884@linuxfoundation.org> References: <20260917151539.408551884@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeff Layton [ Upstream commit 09ea3eb9a518565f5bca386e81b993ed8825f5e8 ] 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 [ preserved the branch’s boolean fields instead of the upstream flags bitmap ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/netns.h | 1 + fs/nfsd/nfs4state.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -69,6 +69,7 @@ struct nfsd_net { bool grace_end_forced; bool client_tracking_active; time64_t boot_time; + time64_t boot_time_bt; /* same instant in CLOCK_BOOTTIME */ struct dentry *nfsd_client_dir; --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6469,7 +6469,7 @@ bool nfsd4_force_end_grace(struct nfsd_n */ 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 (READ_ONCE(nn->grace_end_forced)) @@ -8877,6 +8877,7 @@ static int nfs4_state_create_net(struct 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(); nn->grace_ended = false; nn->grace_end_forced = false; nn->client_tracking_active = false;