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 B6DD621B1B9; Wed, 25 Jun 2025 08:25:32 +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=1750839932; cv=none; b=Zf7E/9ggbvneTdB57MZ3NfBxBA+LjB8MLCPB432EXnOLr2fe3oIZRhk2cwuJV00BrDf5KlUUio7k99OMVl30/g8pjNuWsPXH0u9zvydlvTI50tMl3fy8TV0Q10NoHSZgf7s/E3uqQq2nWwQCmcL1Xzxhdms/RH1MBQKIrDWfoyY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750839932; c=relaxed/simple; bh=76JayBgTFIMor183bdEqxVCpqwxcIxrDDM2N1ad5G38=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JZoHCv4VJzjFWiesuwb7tg+10MFvOGcLlBkNYNMPcVjdRtzcK/jJCk6tCyyKTmFMHML18Q1vprEbt0nTOsjejEcaOLxYMFCpBOeT4NDfZ1fAS4KlTcTFJBy3damD0ETacKJILvpLj0CGw1xvOsnkenvRa2qcfnjKbnq3FOTRbas= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nv7GTPsW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nv7GTPsW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA782C4CEEA; Wed, 25 Jun 2025 08:25:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750839932; bh=76JayBgTFIMor183bdEqxVCpqwxcIxrDDM2N1ad5G38=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nv7GTPsWdGsg7qLtxhsPf5INIySeXcAPMqUiWVpuElGQ2f3iX+ayL+qmMdIG5Df0l U8KQb3x0zG2t+LB5i6+mEXd0cdCqyVqmp+HJt/wUUN97omZg1lLwD74cKHOYLjam6h UN1HoueYZlM89qk+sMbtgRm1KZuWxESm5FomFBDU= Date: Wed, 25 Jun 2025 09:25:29 +0100 From: Greg Kroah-Hartman To: Holger =?iso-8859-1?Q?Hoffst=E4tte?= Cc: stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org, lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com, f.fainelli@gmail.com, sudipm.mukherjee@gmail.com, srw@sladewatkins.net, rwarsow@gmx.de, conor@kernel.org, hargar@microsoft.com, broonie@kernel.org, Christian Brauner Subject: Re: [PATCH 6.15 000/588] 6.15.4-rc2 review Message-ID: <2025062511-tutor-judiciary-e3f9@gregkh> References: <20250624121449.136416081@linuxfoundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Jun 25, 2025 at 10:00:56AM +0200, Holger Hoffstätte wrote: > (cc: Christian Brauner> > > Since 6.15.4-rc1 I noticed that some KDE apps (kded6, kate (the text editor)) > started going into a tailspin with 100% per-process CPU. > > The symptom is 100% reproducible: open a new file with kate, save empty file, > make changes, save, watch CPU go 100%. perf top shows copy_to_user running wild. > > First I tried to reproduce on 6.15.3 - no problem, everything works fine. > > After checking the list of patches for 6.15.4 I reverted the anon_inode series > (all 3 for the first attempt) and the problem is gone. > > Will try to reduce further & can gladly try additional fixes, but for now > I'd say these patches are not yet suitable for stable. Does this same issue also happen for you on 6.16-rc3? thanks, greg k-h