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 2303A3624D3; Thu, 15 Oct 2026 17:14:51 +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=1792084505; cv=none; b=bQIAp9YWDxs3Rl3MpQxtifh2I9sS8VSbv4X2vKgQ55THATP/cM9NDB2G7CT46jxfkTsmTuBxpA/EOLUHmSPH/anxclBQ11YFSCpFriIgZDeKZ72yqSUjhlMAv2tFyv+jBnQt17JJ/A30Gq2ub20Ft93Gwat8FgmCO9tJQr6UMsk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792084505; c=relaxed/simple; bh=eZt1UaUU1vVsBntHCLv6tEKj/sW21ddy9aCK090k4Xk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Roz5wT3gDhUO5C9e6ISmnthQOA97rv86mKW5LH6t4X38ofh/VevCmjCuMk2+Eorbad6l85b8tEIC3cOCxuFhYCd8NOUx4+UU9lvKm9F0Exb2LoC393vQQWne9lh39xWR5fID9dn8bEch+5MEi/k0q8EmYSR3MVhQBDdxmof/d1U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fhISbsyO; 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="fhISbsyO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C18561F000C4; Thu, 15 Oct 2026 17:14:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792084491; bh=KLdykWTLGoPKYRJKwfyasOnAusZA7QJ5FaONPm+7FFM=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=fhISbsyOr19DwR/zy3EgBIzPH1Ysf2RMXimt6k7bgWBs1T12fu2FFUwIlXW+69+h4 jOoz7Jy8/6hXk+uXF+KKKGPXkKBst9FVF8kCNXL67RGzJyVEv3YO/u6QIDe8MUE7FS kQnsd+4tPbzPDUP08T479szl//OXJzBjRyTaE36/qb+5d9WeDDWy7W5VJdChKlnD3o TKVVNkwX0JRm8eg2gezK/CT2iMV1Sf21P+EQJvBtd4spb4g0blo64O3nGZMTrQAJu2 H4N5l1BTyeZHcQHjOOOAKxTXl3lx97UrO9IJ0CcGtkOzuhZ0lhXnAQs2zBg//X2c1D xosgbGX5gBYVQ== Message-ID: <41e63ab9155a4fca2ac377dfa3dc2a07518a3eee.camel@kernel.org> Subject: Re: [PATCH 7.2.y] nfsd: fix all-zero stateid in CB_OFFLOAD for async COPY From: Jeff Layton To: Lubos Rendek , stable@vger.kernel.org Cc: Sasha Levin , Chuck Lever , linux-nfs@vger.kernel.org, regressions@lists.linux.dev, linux-kernel@vger.kernel.org, Fabian =?ISO-8859-1?Q?Gr=FCnbichler?= Date: Thu, 15 Oct 2026 13:14:47 -0400 In-Reply-To: <20261015005340.550134-1-l.rendek@proxmox.com> References: <20261015005340.550134-1-l.rendek@proxmox.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Thu, 2026-10-15 at 11:53 +1100, Lubos Rendek wrote: > [ There is no upstream commit: this fixes the 7.2.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. ] >=20 > Since commit 14b978e8d05c ("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(). >=20 > 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. >=20 > Tested on 7.2.10 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 7.2.4 > and 7.2.9; the affected code in nfsd4_copy() is the same in 7.2.10. >=20 > Fixes: 14b978e8d05c ("nfsd: fix stale s2s_cp_stateids IDR entry for async= COPY") > Closes: https://lore.kernel.org/stable/7cc824c4-632d-49df-ae5e-cfcbb5bf76= ad@proxmox.com/ > Assisted-by: Claude:claude-opus-5-5 > Signed-off-by: Lubos Rendek > --- > fs/nfsd/nfs4proc.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c > index 939749709..7c2955796 100644 > --- a/fs/nfsd/nfs4proc.c > +++ b/fs/nfsd/nfs4proc.c > @@ -2243,6 +2243,8 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_com= pound_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) !=3D 0) > async_copy->attr_update =3D true; Reviewed-by: Jeff Layton