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Sat, 29 Mar 2025 14:57:58 +0000 Received: from DS7PR10MB5134.namprd10.prod.outlook.com ([fe80::39b2:9b47:123b:fc63]) by DS7PR10MB5134.namprd10.prod.outlook.com ([fe80::39b2:9b47:123b:fc63%5]) with mapi id 15.20.8583.030; Sat, 29 Mar 2025 14:57:58 +0000 Message-ID: <445aeb83-5d84-4b4b-8d87-e7f17c97e6bf@oracle.com> Date: Sat, 29 Mar 2025 10:57:59 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] Chrome and VSCode breakage with the commit b9b588f22a0c To: Takashi Iwai Cc: linux-fsdevel@vger.kernel.org, stable@vger.kernel.org, regressions@lists.linux.dev, linux-kernel@vger.kernel.org References: <874j0lvy89.wl-tiwai@suse.de> <87wmc83uaf.wl-tiwai@suse.de> Content-Language: en-US From: Chuck Lever In-Reply-To: <87wmc83uaf.wl-tiwai@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH2PR17CA0010.namprd17.prod.outlook.com (2603:10b6:610:53::20) To DS7PR10MB5134.namprd10.prod.outlook.com (2603:10b6:5:3a1::23) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR10MB5134:EE_|CH0PR10MB7535:EE_ X-MS-Office365-Filtering-Correlation-Id: b17bee7a-750b-442e-ca91-08dd6ed217d6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|13003099007; 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The symptom is that Chrome and VSCode stopped working >> with Gnome Scaling, as reported on openSUSE Tumbleweed bug tracker >> https://bugzilla.suse.com/show_bug.cgi?id=1236943 >> >> Quoting from there: >> """ >> I use the latest TW on Gnome with a 4K display and 150% >> scaling. Everything has been working fine, but recently both Chrome >> and VSCode (installed from official non-openSUSE channels) stopped >> working with Scaling. >> .... >> I am using VSCode with: >> `--enable-features=UseOzonePlatform --enable-features=WaylandWindowDecorations --ozone-platform-hint=auto` and for Chrome, I select `Preferred Ozone platform` == `Wayland`. >> """ >> >> Surprisingly, the bisection pointed to the backport of the commit >> b9b588f22a0c049a14885399e27625635ae6ef91 ("libfs: Use d_children list >> to iterate simple_offset directories"). >> >> Indeed, the revert of this patch on the latest 6.13.4 was confirmed to >> fix the issue. Also, the reporter verified that the latest 6.14-rc >> release is still affected, too. >> >> For now I have no concrete idea how the patch could break the behavior >> of a graphical application like the above. Let us know if you need >> something for debugging. (Or at easiest, join to the bugzilla entry >> and ask there; or open another bug report at whatever you like.) >> >> BTW, I'll be traveling tomorrow, so my reply will be delayed. >> >> >> thanks, >> >> Takashi >> >> #regzbot introduced: b9b588f22a0c049a14885399e27625635ae6ef91 >> #regzbot monitor: https://bugzilla.suse.com/show_bug.cgi?id=1236943 > > After all, this seems to be a bug in Chrome and its variant, which was > surfaced by the kernel commit above: as the commit changes the > directory enumeration, it also changed the list order returned from > libdrm drmGetDevices2(), and it screwed up the application that worked > casually beforehand. That said, the bug itself has been already > present. The Chrome upstream tracker: > https://issuetracker.google.com/issues/396434686 > > #regzbot invalid: problem has always existed on Chrome and related code > > > Takashi Thank you very much for your report and for chasing this to conclusion. -- Chuck Lever