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Message-ID: <9c76f7eb-64f5-ceac-cc4a-610db79c8233@leemhuis.info>
Date:   Tue, 27 Sep 2022 09:44:05 +0200
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To:     David Chen <david.chen@nutanix.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@suse.de>,
        Josh Poimboeuf <jpoimboe@kernel.org>
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From:   Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Re: "BUG at kernel/entry/common.c:407!" on 5.10.133+
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Hi, this is your Linux kernel regression tracker.

On 26.09.22 19:57, David Chen wrote:
> 
> On 5.10 branch starting from 5.10.133, if I do:
> 
>   echo 1 > /proc/sys/kernel/stack_tracer_enabled
> 
> The system will lock up, and the console will keep spewing
> "BUG at kernel/entry/common.c:407!" indefinitely.
> 
> I bisect this issue down to "c9eb5dc x86: Use return-thunk in asm code".
> Though interestingly, when I tried this on 5.19.11 which also contains the
> change, the issue didn't occur. Also this issue happens on both KVM guest and
> Virtualbox guest. I'm not sure if this affects non-VM for not.
> 
> Any help is appreciated.

Quick question: what was the latest version you tried to reproduce this
on? There were a few ftrace fixes that went into 5.10.144 (released one
week ago).

Ciao, Thorsten