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Date:   Sun, 8 Jan 2023 21:58:50 +0100
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Subject: Re: Commit b320d6c4 broke mt76
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To:     "Alexander E. Patrakov" <patrakov@gmail.com>,
        Benjamin Berg <benjamin.berg@intel.com>
Cc:     Johannes Berg <johannes.berg@intel.com>,
        Felix Fietkau <nbd@nbd.name>, linux-wireless@vger.kernel.org,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>
References: <CAN_LGv2FLLKxsbruJ0u_Gh3+_nTGaVGd4154DXQ7Tz+BnFt3EQ@mail.gmail.com>
From:   "Linux kernel regression tracking (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>
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[CCing the regression list, as it should be in the loop for regressions:
https://docs.kernel.org/admin-guide/reporting-regressions.html]

On 08.01.23 20:46, Alexander E. Patrakov wrote:
> Hello Benjamin,
> 
> I have this hardware, which is supported by the mt76x2e driver:
> 
> 04:00.0 Network controller [0280]: MEDIATEK Corp. MT7612E 802.11acbgn
> PCI Express Wireless Network Adapter [14c3:7612]
> 
> Since Linux 6.1, the mt76 driver panics the kernel due to null
> dereference shortly after authenticating to the AP, as follows:

Thx for your report.

> [...]
>
> On Reddit, there is a similar thread with a USB adapter:
> https://www.reddit.com/r/archlinux/comments/zufy3n/linuxzen_611zen11_crashes_while_trying_to_use_usb/
> 
> I have checked with the nearly latest git revisions of both the kernel
> (9b43a525db125799df81e6fbef712a2ae50bfc5d) and the mt76 driver from
> https://github.com/openwrt/mt76 (679254c). The issue still exists.
> 
> I have bisected this, and the first bad commit is yours:
> 
> b320d6c456ff2aa43491654407d448bcfa58ac9f is the first bad commit
> commit b320d6c456ff2aa43491654407d448bcfa58ac9f
> Author: Benjamin Berg <benjamin.berg@intel.com>
> Date:   Fri Sep 2 16:12:40 2022 +0200

Not my area of expertise, but I guess it's fixed by this patch:

https://lore.kernel.org/all/20221230200747.19040-1-nbd@nbd.name/

Earlier reports:

https://lore.kernel.org/linux-wireless/CAFktD2fRnSbNgWRRoGbQzG5_Mw7=zFJKTVBHS_3D+mNUYcv9hQ@mail.gmail.com/
https://bugzilla.kernel.org/show_bug.cgi?id=216839
https://bugzilla.kernel.org/show_bug.cgi?id=216844

Hopefully everyone is back from vacation tomorrow so that we can finally
get this fixed in mainline soon.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.