linux-kernel - Re: [PATCH V5 00/22] arch: Add basic LoongArch support

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Date:   Tue, 28 Dec 2021 16:34:33 +0800
From:   Xi Ruoyao <xry111@...gyan1223.wang>
To:     Huacai Chen <chenhuacai@...il.com>
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH V5 00/22] arch: Add basic LoongArch support

On Tue, 2021-12-21 at 15:53 +0800, Huacai Chen wrote:

> On Mon, Dec 20, 2021 at 5:04 PM Xi Ruoyao <xry111@...gyan1223.wang>
> wrote:
> > 
> > The snapshot panics on my system under high pressure (building and
> > testing GCC).  The panic message is pasted, but it's kind of broken up
> > likely because multiple CPU cores were outputing to the serial console
> > simutaniously.
> > 
> > The config is attached.  I'm not sure the reason of the panic (bug in
> > the patches or bug in mainline kernel?) Do you have some pointers to
> > diagnostic and fix the issue?
> > 
> > [ 5391.004745] CPU 1 Unable to handle kernel paging request at virtual address 000000000040007e, era == 90000000003aa07c, ra == 90000000003aa84c

/* snip */

> We also found that the latest github kernel has some stable issues,
> and we are investigating.

I rebased the patches onto 438645193e59e91761ccb3fa55f6ce70b615ff93 and
the problem *seems* gone.  Not sure if it's something fixed in the
mainline or some more strange thing.
-- 
Xi Ruoyao <xry111@...gyan1223.wang>
School of Aerospace Science and Technology, Xidian University