linux-ext4 - Re: [PATCH v3 15/17] ext4: convert free groups order lists to xarrays

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3710fdbf-9f3b-45d7-8de0-1a3351a58f63@roeck-us.net>
Date: Wed, 23 Jul 2025 22:20:27 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Theodore Ts'o <tytso@....edu>
Cc: Baokun Li <libaokun1@...wei.com>, linux-ext4@...r.kernel.org,
 adilger.kernel@...ger.ca, jack@...e.cz, linux-kernel@...r.kernel.org,
 ojaswin@...ux.ibm.com, julia.lawall@...ia.fr, yi.zhang@...wei.com,
 yangerkun@...wei.com, libaokun@...weicloud.com
Subject: Re: [PATCH v3 15/17] ext4: convert free groups order lists to xarrays

On 7/23/25 21:54, Theodore Ts'o wrote:
> On Wed, Jul 23, 2025 at 08:55:14PM -0700, Guenter Roeck wrote:
>> Hi,
>>
>> On Mon, Jul 14, 2025 at 09:03:25PM +0800, Baokun Li wrote:
>>> While traversing the list, holding a spin_lock prevents load_buddy, making
>>> direct use of ext4_try_lock_group impossible. This can lead to a bouncing
>>> scenario where spin_is_locked(grp_A) succeeds, but ext4_try_lock_group()
>>> fails, forcing the list traversal to repeatedly restart from grp_A.
>>>
>>
>> This patch causes crashes for pretty much every architecture when
>> running unit tests as part of booting.
> 
> I'm assuming that you're using a randconfig that happened to enable
> CONFIG_EXT4_KUNIT_TESTS=y.
> 

I enable as many kunit tests as possible, including CONFIG_EXT4_KUNIT_TESTS=y,
on top of various defconfigs. That results in:
	total: 637 pass: 59 fail: 578
with my qemu boot tests, which in a way is quite impressive ;-).

Guenter