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Date:   Wed, 9 Mar 2022 20:57:26 +0100
From:   Michael =?UTF-8?B?QsO8c2No?= <m@bues.ch>
To:     Felix Fietkau <nbd@nbd.name>,
        Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Shayne Chen <shayne.chen@mediatek.com>,
        Sean Wang <sean.wang@mediatek.com>
Cc:     linux-wireless@vger.kernel.org
Subject: Re: mt7921: Oops in mt76_dma_rx_fill
Message-ID: <20220309205726.35337cb7@barney>
In-Reply-To: <20220209170550.0a73ebe4@barney>
References: <20220209170550.0a73ebe4@barney>
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Does anybody have an idea why this driver crashes?

I tried to bisect it. But that turns out to be very hard as the
intermediate versions are all very unstable, too. For various reasons.
Therefore, I aborted my bisect attempt.

But if you have an idea what patch I could try, I'd be very happy to
do so.

--=20
Michael B=C3=BCsch
https://bues.ch/


On Wed, 9 Feb 2022 17:05:50 +0100
Michael B=C3=BCsch <m@bues.ch> wrote:

> Hi,
>=20
> on the latest stable 5.16.8 (df659ebe) the Mediatek WLAN driver
> crashes on my machine in a DMA function.
>=20
> Please excuse me for the crappy photos. The first one has been
> captured out of a video. Therefore it's partially interleaved with the
> predecessor frame.
>=20
> https://bues.ch/misc/mt7921/mt7921_oops1.jpg
> https://bues.ch/misc/mt7921/mt7921_oops2.jpg
>=20
> Most of the time the crash happens right during system boot.
>=20
> The stable kernel 5.15.y does not crash. (However, I frequently get
> connection interruptions. But I'm not sure whether that's related to
> the driver.)
>=20
> 03:00.0 Network controller: MEDIATEK Corp. MT7921 802.11ax PCI
> Express Wireless Network Adapter
>=20
> 03:00.0 0280: 14c3:7961
>         Subsystem: 17aa:e0bc
>         Physical Slot: 0
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF-
> FastB2B- ParErr- DEVSEL=3Dfast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
> INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed
> to IRQ 94 IOMMU group: 11
>         Region 0: Memory at 670200000 (64-bit, prefetchable) [size=3D1M]
>         Region 2: Memory at 670300000 (64-bit, prefetchable)
> [size=3D16K] Region 4: Memory at 670304000 (64-bit, prefetchable)
> [size=3D4K] Capabilities: <access denied>
>         Kernel driver in use: mt7921e
>         Kernel modules: mt7921e
>=20
>=20


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