linux-kernel - Re: [PATCH v2 1/1] x86/fred/signal: Prevent single-step upon ERETU completion

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Message-ID: <037c6541-a50b-445f-a82d-1cbcc94a3244@zytor.com>
Date: Thu, 22 May 2025 10:26:52 -0700
From: Xin Li <xin@...or.com>
To: Dave Hansen <dave.hansen@...el.com>, linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        peterz@...radead.org, andrew.cooper3@...rix.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/1] x86/fred/signal: Prevent single-step upon ERETU
 completion

On 5/22/2025 10:22 AM, Dave Hansen wrote:
> On 5/22/25 10:17, Xin Li (Intel) wrote:
>> Clear the software event flag in the augmented SS to prevent infinite
>> SIGTRAP handler loop if TF is used without an external debugger.
> 
> Do you have a test case for this? It seems like the kind of thing we'd
> want in selftests/.

Ah, good point!

The issue was found during an internal LASS test, I will convert it to a
selftest.

Thanks!
     Xin