From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (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 17D292EC090; Thu, 15 Oct 2026 00:58:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=94.136.29.106 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792025884; cv=none; b=JJ26Pn+xMnCPxDcqLmfU+ZP1EyZkxlyJ+zEXQMvcrLnVtlwYOLopWa+6cuKfvkBAOaY3XufzVUnVU1+OtMrdw3Ka8Tg2lii7rqqCvo+pMlKMP1Pw6ipkWEDen1+E6GmPqygf5fQ/nq1E2Ms7ZHTrYT8FhKbkKkEoVfDU1BuOdpg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792025884; c=relaxed/simple; bh=BOUiJpFDSD9/2JBzgiFuKETS6BD5hFqNsWrC6W8j3GI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CJ1bGcQ8rKCUyptgP5PD6L29tQhizzSWlXgfv+zp1CjMNfSgrIX5KWNs+Nnw30QDqKDK4v+YqRLijMkMFBJuWB00XVdfsXHYkJZeLN249oYjevF/xc7BcJLp25RLzr8Clf/seMTnIri41rhTmWFyOOEcuoZMoWoP9+XjYhn4Th8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=proxmox.com; spf=pass smtp.mailfrom=proxmox.com; arc=none smtp.client-ip=94.136.29.106 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=proxmox.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=proxmox.com Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 235AB422D2; Thu, 15 Oct 2026 02:58:00 +0200 (CEST) From: Lubos Rendek To: stable@vger.kernel.org Cc: Jeff Layton , Sasha Levin , Chuck Lever , linux-nfs@vger.kernel.org, regressions@lists.linux.dev, linux-kernel@vger.kernel.org, =?UTF-8?q?Fabian=20Gr=C3=BCnbichler?= Subject: [PATCH 6.18.y] nfsd: fix all-zero stateid in CB_OFFLOAD for async COPY Date: Thu, 15 Oct 2026 11:57:25 +1100 Message-ID: <20261015005725.550511-1-l.rendek@proxmox.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1792025879200 [ There is no upstream commit: this fixes the 6.18.y backport of d0beaee498e1. Mainline fixed the problem as part of the async COPY rework in commit f307b4f7ed17 ("nfsd: split nfsd4_copy into transient and durable async copy objects"), which is too risky to backport. ] Since commit 9b4e5e9ba5ae ("nfsd: fix stale s2s_cp_stateids IDR entry for async COPY"), nfsd4_copy() calls dup_copy_fields() before the copy stateid is created and then writes the new stateid only into the COPY result. The async copy's own cp_res.cb_stateid stays zero, so nfsd4_send_cb_offload() sends CB_OFFLOAD with an all-zero stateid. The client cannot match it to its pending COPY and waits forever in nfs42_proc_copy(). Also copy the new stateid into async_copy->cp_res.cb_stateid. Calling dup_copy_fields() after nfs4_init_copy_state() instead is not an option, because dup_copy_fields() also copies cp_stateid and would overwrite the stateid that the backport moved to the async copy. Tested on 6.18.56 with an NFSv4.2 server-side COPY between two exports: with this change the copy completes and CB_OFFLOAD carries the same stateid as the COPY reply. Without it, cp(1) hangs on 6.18.55; the affected code in nfsd4_copy() is the same in 6.18.56. Fixes: 9b4e5e9ba5ae ("nfsd: fix stale s2s_cp_stateids IDR entry for async COPY") Closes: https://lore.kernel.org/stable/7cc824c4-632d-49df-ae5e-cfcbb5bf76ad@proxmox.com/ Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Lubos Rendek --- fs/nfsd/nfs4proc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index bc14c3939..aeab09dde 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -2084,6 +2084,8 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, goto out_dec_async_copy_err; memcpy(&result->cb_stateid, &async_copy->cp_stateid.cs_stid, sizeof(result->cb_stateid)); + memcpy(&async_copy->cp_res.cb_stateid, &async_copy->cp_stateid.cs_stid, + sizeof(async_copy->cp_res.cb_stateid)); if ((READ_ONCE(copy->nf_dst->nf_file->f_mode) & FMODE_NOCMTIME) != 0) async_copy->attr_update = true; -- 2.47.3