From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6875417C7D4; Mon, 9 Sep 2024 17:34:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725903281; cv=none; b=fHoZUuGmdAfk0VJYlP96i0W516mD6w9qjMopaSXkQgM1NC5AM+cCGgSO3s2Qb2JscgGKNGUs2hQw4WTFJld/mq9r+Efl03sTx+9bsOT7Uzja44qS0YjUDycLU8L0Kdt7CA2D2xuQrV9y1Y7XWIhYkyPji6dwL5aVv2zUXNrAdOY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725903281; c=relaxed/simple; bh=fHxhpDtxF4uM+xavVUOwAmhGhUaBxcR3ZkY3EJpAXXY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=oZzIbGWld87kBO4OoDg6P3Egv4VTQ5/d4UnXiTZgQ0LxOgMjQ++A1f2Grb56h8clS9lp47tSthYzPvD6cUgr+haGNUesqlhL4KQG3RKOjplNQjarNDl4zWsnFwyVMjQ1tRQx4BBGomt0Wn1jU0PVsCPd6Q9Mwjo3gAw9nqyYB0c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mK3TRnvu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mK3TRnvu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23691C4CEC5; Mon, 9 Sep 2024 17:34:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725903281; bh=fHxhpDtxF4uM+xavVUOwAmhGhUaBxcR3ZkY3EJpAXXY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=mK3TRnvuk5SOcqB8TzMQjl4n9hX0bpzB72rEA0pzmShVBQ49VmGEeLc8IhKvpt3tX 5URgxD7xne0t5DQIAOypLMTmm+zJFtJl/1OMXXtKtFgRLRkvjH3TztOvJnbNBp1A7k xlCHVYmDqoizaPM3MWcWbiNz4Dh4AxzZF9PfuTexAEvsg5yW7g/ArkScJdV5rT1wk7 6SRT+wZCnQ8WGUFw7z4CFrDFXK/bdepgXMewlMGQPLKTlRzXgoGTrFJH9AV6jwFDHk Y0YGijJSpM1bSjjU29KFzBtetA5BOatoxjDuZ4V4DmuAZw6RNVv9t3AHYv7YFtMwvm dQMvtkMdaEe3g== Message-ID: Subject: Re: [PATCH 1/3] nfsd: add more info to WARN_ON_ONCE on failed callbacks From: Jeff Layton To: Olga Kornievskaia Cc: Chuck Lever , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 09 Sep 2024 13:34:33 -0400 In-Reply-To: References: <20240826-nfsd-cb-v1-0-82d3a4e5913b@kernel.org> <20240826-nfsd-cb-v1-1-82d3a4e5913b@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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2024 at 8:54=E2=80=AFAM Jeff Layton = wrote: > >=20 > > Currently, you get the warning and stack trace, but nothing is printed > > about the relevant error codes. Add that in. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/nfsd/nfs4callback.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > >=20 > > diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c > > index d756f443fc44..dee9477cc5b5 100644 > > --- a/fs/nfsd/nfs4callback.c > > +++ b/fs/nfsd/nfs4callback.c > > @@ -1333,7 +1333,8 @@ static void nfsd4_cb_done(struct rpc_task *task, = void *calldata) > > return; > >=20 > > if (cb->cb_status) { > > - WARN_ON_ONCE(task->tk_status); > > + WARN_ONCE(task->tk_status, "cb_status=3D%d tk_status=3D= %d", > > + cb->cb_status, task->tk_status); > > task->tk_status =3D cb->cb_status; > > } >=20 > Educational question: why is this warning there in the first place? I > can appreciate the value of information. Does knfsd expect that a > callback should never fail with an error and thus tries to always > catch it? A tracepoint can log an rpc tasks status but I realize that > it doesn't capture attention like a WARN_ON. >=20 > I have a report with this warn_on which I'm trying to figure out why > is happening but I was surprised to find nfsd cares so much about the > callback status. >=20 This indicates that we had to reissue the RPC, and it got back a second error. The stack trace is not terribly helpful, IMO. I personally tripped this while working on the delstid patches, because I had some bugs in that series=C2=A0initially. Chuck and I have discussed that the callback channel really needs full code audit and (probably a real overhaul). The code is just not as robust as it ought to be, IMO. I've no objection to ripping this warning out, but it does indicate that the callback "engine" is in a situation that it may not handle well. --=20 Jeff Layton