linux-kernel - Re: [PATCH 6.15 000/588] 6.15.4-rc2 review

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Message-ID: <e9249afe-f039-4180-d50d-b199c26dea26@applied-asynchrony.com>
Date: Wed, 25 Jun 2025 10:00:56 +0200
From: Holger Hoffstätte <holger@...lied-asynchrony.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org
Cc: patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
 linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
 lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
 f.fainelli@...il.com, sudipm.mukherjee@...il.com, srw@...dewatkins.net,
 rwarsow@....de, conor@...nel.org, hargar@...rosoft.com, broonie@...nel.org,
 Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH 6.15 000/588] 6.15.4-rc2 review

(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.

thanks
Holger