linux-kernel - Fwd: Null pointer dereference regression introduced by 326e1c208f3f24d14b93f910b8ae32c94923d22c

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Date:   Fri, 2 Jun 2023 09:37:08 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux USB <linux-usb@...r.kernel.org>,
        Linux Stable <stable@...r.kernel.org>
Cc:     Samuel Čavoj <samuel@...oj.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Fwd: Null pointer dereference regression introduced by
 326e1c208f3f24d14b93f910b8ae32c94923d22c

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> Null pointer deref
> 
> after reverting 326e1c208f3f24d14b93f910b8ae32c94923d22c the problem is gone and the kernel does not crash anymore
> 
> See this discussion for details:
> 
> https://bbs.archlinux.org/viewtopic.php?pid=2102715#p2102715
> 

See Bugzilla for the full thread and attached journal log.

On the other hand, from linked Archlinux forum link:

> Hi,
> 
> I am running arch successfully since a couple of years on my Acer ConceptD 7 laptop. Since a kernel update on 24th of May I am having strange issues (never seen this before):
> 
> - sometimes I cannot even login (using gdm) - after entering password just a blank screen
> - if I can login I can start working - after a while commands I enter in the console are accepted but do nothing (i.e. grub-mkconfig -o ..... can enter the command but just no output - it does nothing - happens with most other command then as well....)
> - Reboot does not work - stuck somewhere - have to switch the machine off the hard way
> - this happens even when entering runlevel 3 (so no window manager)
> - same happens on the laptop of a friend (exact same model) - unfortunately I have no other piece of hardware which I could use for testing to potentially reproduce the problem
> 
> Managed to trace this down to all kernels after 6.3.3.arch1-1 - so 6.3.3.arch1-1 it the last one which works without any problems
> Same applies for the LTS kernels - not 100% sure but think 6.1.29 ist the last one which works
> 
> Currently I have marked linux linux-headers and nvidia to not upgrade. LTS kernels are upgraded but the latest two kernels (latest from today) up until 6.1.31-1 do NOT work
> 
> Problem: Since most of the command fail when using one of the latest kernel - it is almost impossible to debug - at least I am not knowledgable enough to know where to look.

Anyway, I'm adding it to regzbot:

#regzbot introduced: 326e1c208f3f24 https://bugzilla.kernel.org/show_bug.cgi?id=217517
#regzbot title: USB typec quirk for Asus Zenbook UM325 triggers system freeze on Acer ConceptD 7
#regzbot link: https://bbs.archlinux.org/viewtopic.php?pid=2102715

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217517

-- 
An old man doll... just what I always wanted! - Clara