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 86C8F1E522; Wed, 4 Jun 2025 12:32:32 +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=1749040352; cv=none; b=V9sqw3p5LFxM4FWEju28l2eaxknSge99Pxt6rTPQlSzt4Rnc4K27Y2yVuyQBmELGi7Yd1xWbv0tQ35YnzpQhl2S8apPnC0c/hwqhggPG3uQKcyN6WEiy7Tpo/JQ5Dg71ObWzhS+arChqh8ulEA9nCD8BbYLf/QGum6Vpl4gCXQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749040352; c=relaxed/simple; bh=mLZQYCpTNUqM/1tCyZE09oapdxkD7YSl8k8SirzlWtw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=GtbGxLln85l+S7YHkR4+E0RzZxZ7M0PUqpOvSDz/6M4tcUA5ZROp4cYDBZ0DLtXGM4/Px4xP6X1mtzOouU4rcuiofTyRkd+prEOUViIZP0VUFOfXEVQdhBssB4vm0wybTWbewO1kLKWYJkVHhRSqpBEZkiReWvpBViuZHwDJgjc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ryATeKJS; 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="ryATeKJS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F6DDC4CEE7; Wed, 4 Jun 2025 12:32:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749040352; bh=mLZQYCpTNUqM/1tCyZE09oapdxkD7YSl8k8SirzlWtw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=ryATeKJSm+Q2F7n9q011EWbhtZQbtrXhNXI0uoZYVIvGrnU+OHf++5oy3xf2ztQMV D+zzAC4yi/ABKoQJAJlfzfIkGwm4PUsgY4jxsAPKs4Q6XqhIA/F1Tez8970BWBuC9x P3ro7EX7kZ72259+SiPHDPe93h2U8WE3BzlXEbNrU/tQST5mHxyNZxT9VC1Eb3piu6 ZF0USYLHyRYUyVgjc9RqtLJSDIDvWzvJswWmaR/LElrykAND9tb6FaC2L2KifTaVpL rGPMhwf/hGxEr1SbSoYB0TQFErECFwZmw1hZJx1Z3yfkuYKRNzQPIvshoc1B9ycSYw loMFjGtsvJgFA== Message-ID: <0c0e8c720705d86b37a103346bccc36de4f5b025.camel@kernel.org> Subject: Re: [PATCH v13 0/9] ref_tracker: add ability to register a debugfs file for a ref_tracker_dir From: Jeff Layton To: Jakub Kicinski Cc: Andrew Morton , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Krzysztof Karas , Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Thomas =?ISO-8859-1?Q?Wei=DFschuh?= Date: Wed, 04 Jun 2025 08:32:29 -0400 In-Reply-To: <20250603192949.3a7fc085@kernel.org> References: <20250603-reftrack-dbgfs-v13-0-7b2a425019d8@kernel.org> <20250603192949.3a7fc085@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Tue, 2025-06-03 at 19:29 -0700, Jakub Kicinski wrote: > On Tue, 03 Jun 2025 07:27:11 -0400 Jeff Layton wrote: > > For those just joining in, this series adds a new top-level > > "ref_tracker" debugfs directory, and has each ref_tracker_dir register = a > > file in there as part of its initialization. It also adds the ability t= o > > register a symlink with a more human-usable name that points to the > > file, and does some general cleanup of how the ref_tracker object names > > are handled. > >=20 > > This reposting is mostly to address Krzysztof's comments. I've dropped > > the i915 patch, and rebased the rest of the series on top. > >=20 > > Note that I still see debugfs: warnings in the i915 driver even when we > > gate the registration of the debugfs file on the classname pointer bein= g > > NULL. Here is a CI report from v12: > >=20 > > https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_148490v8/bat-arl= s-6/igt@i915_selftest@live@workarounds.html > >=20 > > I think the i915 driver is doing something it shouldn't with these > > objects. They seem to be initialized more than once, which could lead > > to leaked ref_tracker objects. It would be good for one of the i915 > > maintainers to comment on whether this is a real problem. >=20 > I still see the fs crashes: > https://netdev-3.bots.linux.dev/vmksft-packetdrill-dbg/results/149560/2-t= cp-slow-start-slow-start-app-limited-pkt/stderr > I'll hide this series from patchwork for now. We will pull from Linus > on Thu, I'll reactivate it and let's see if the problem was already > fixed. Sorry, I never got any mail about those failures. I would have looked at that sooner. It looks like the last netns reference can be put in a rcu callback? That makes sense. I think ref_tracker_dir_exit() has to remain safe to call from any context. Perhaps we can defer the dentry deletion to the system_wq? We can drop this series for now. I'll have to think about this. Thanks, --=20 Jeff Layton