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 8202C25A2AD; Mon, 5 May 2025 14:57:36 +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=1746457056; cv=none; b=UTzfhW0vxW7jAkj7dDbKyKsip+J608EObM9GM+8KEKBgD31ksdwhLgLDkDtIE05tHvsNTXxUDU3OoMTGXvPzPYDQUBrI7aGWrtM3SZtq6N4HYcUX0tMnfzXxfNUxm/uzYuOL5gfB9njuS0IJk8jkQzKlYiY20OwtJzohqCobIt0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746457056; c=relaxed/simple; bh=jjejZ+IzdylcT3G2+tmJ2Ar7vyBZ2rWBTr+EGnorvRU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=uR3RjK+WpCgLUpT82x1lmPTw1rj6WHDt0ucMaHi6HoGfYuJCAD272ex+Ab/A4zp/Z9kkD7TrMkSrTCxo00PVVf8fq2p+LsM0YP9BxxGTPjXgi5FHj9bbTi/iKsz9ipbzxIsk29y8fUlTBgnBUHt22O69fi0y/oFNrMXyIAgtmMc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lP5okPlw; 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="lP5okPlw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C38FDC4CEE4; Mon, 5 May 2025 14:57:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746457056; bh=jjejZ+IzdylcT3G2+tmJ2Ar7vyBZ2rWBTr+EGnorvRU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=lP5okPlwum96nnJ81Pep0eMnnwt+UcSVvwLhiPtxMN5d3y6bodi6F4jDdFAOoGvgD V74bTaTRrIRYhNj7bwcKGmMe5fB2AbZO83lwbb0UJH9z2q29/VrgBViTLgjTuyFt/q XHKCrf/eoJf4wSKbuBmZHNu5GHsL3ZNdo8fddXbDbo7ryk/VWtetdMepo+cMV/rI4A IxJlpm8+Xc/I8oqi6fLlFggYXlSw1KxIGOGMJnGOyTrrFZswd0J11t1YOB7VIPUuNJ eq7dj10Y1nBgujGkMwvvh8TVymLTOudSdqxracZvji/WIg/fqQVIDA4NFLSk1WO9z1 UtfJuwOzxqy2w== Message-ID: <9eb4aaa54fb326bc589e2936b0380da06ed008e9.camel@kernel.org> Subject: Re: [PATCH RFC 0/2] nfs: free leftover lsegs before freeing a layout in pnfs_put_layout_hdr From: Jeff Layton To: Trond Myklebust , Anna Schumaker Cc: Omar Sandoval , Chris Mason , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 05 May 2025 10:57:34 -0400 In-Reply-To: <20250428-nfs-6-16-v1-0-2d45b80facef@kernel.org> References: <20250428-nfs-6-16-v1-0-2d45b80facef@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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don't have a reliable reproducer for the > problem that Omar reported. I'm also not sure this is the best fix for > the problem. There is probably a case to be made that the real bug is in > the error handling for pnfs_layoutreturn_before_put_layout_hdr(). >=20 > My guess is that the issue is that we end up with entries on the > plh_return_segs list just before the network goes down. That causes the > LAYOUTRETURN to fail with something that looks retryable, and the lsegs > on the list aren't freed. >=20 > It's possible that we just need to catch ENETUNREACH in the LAYOUTRETURN > error handling, but I'm not sure I correctly understand the problem. If > entries are racing onto the list just before the refcount decrement, > then that wouldn't fix it. >=20 > The first patch should fix the issue of the leaked lsegs, and the second > should let us know if it ever crops up again. >=20 > Signed-off-by: Jeff Layton > --- > Jeff Layton (2): > nfs: free leftover lsegs before freeing a layout in pnfs_put_layout= _hdr > nfs: pr_warn if plh_segs or plh_return_segs are non-empty when free= ing >=20 > fs/nfs/pnfs.c | 23 +++++++++++++++++++++-- > 1 file changed, 21 insertions(+), 2 deletions(-) > --- > base-commit: 5bc1018675ec28a8a60d83b378d8c3991faa5a27 > change-id: 20250428-nfs-6-16-87062aa2989d >=20 > Best regards, Trond, Anna, ping? This seems like the right thing to do, but I'd appreciate a second (and third) set of eyes on this. Thanks, --=20 Jeff Layton