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From: Kalle Valo <kvalo@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,  Ingo Molnar <mingo@redhat.com>,
  Dave Hansen <dave.hansen@linux.intel.com>,  "Rafael J. Wysocki"
 <rafael@kernel.org>,  x86@kernel.org,  linux-pm@vger.kernel.org,
  linux-kernel@vger.kernel.org,  regressions@lists.linux.dev,  Jeff Johnson
 <quic_jjohnson@quicinc.com>
Subject: Re: [regression] suspend stress test stalls within 30 minutes
References: <87o79cjjik.fsf@kernel.org>
	<20240511184847.GCZj-9j2sh1Akpt9iS@fat_crate.local>
	<20240511184945.GDZj-9yaOEWqf1ng8u@fat_crate.local>
	<87h6f4jdrq.fsf@kernel.org>
Date: Mon, 13 May 2024 22:58:27 +0300
In-Reply-To: <87h6f4jdrq.fsf@kernel.org> (Kalle Valo's message of "Sat, 11 May
	2024 23:26:49 +0300")
Message-ID: <878r0djxgc.fsf@kernel.org>
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Kalle Valo <kvalo@kernel.org> writes:

> Borislav Petkov <bp@alien8.de> writes:
>
>> On Sat, May 11, 2024 at 08:48:47PM +0200, Borislav Petkov wrote:
>>> On Sat, May 11, 2024 at 09:22:43PM +0300, Kalle Valo wrote:
>>> > Here's the diff between broken and working .config:
>>> > 
>>> > $ diffconfig broken.config works.config 
>>> > -CALL_PADDING y
>>> > -CALL_THUNKS y
>>> > -CALL_THUNKS_DEBUG n
>>> > -HAVE_CALL_THUNKS y
>>> > -MITIGATION_CALL_DEPTH_TRACKING y
>>> > -MITIGATION_GDS_FORCE y
>>> > -MITIGATION_IBPB_ENTRY y
>>> > -MITIGATION_IBRS_ENTRY y
>>> > -MITIGATION_PAGE_TABLE_ISOLATION y
>>> > -MITIGATION_RETHUNK y
>>> > -MITIGATION_RETPOLINE y
>>> > -MITIGATION_RFDS y
>>> > -MITIGATION_SLS y
>>> > -MITIGATION_SPECTRE_BHI y
>>
>> ... and if it started with -rc4, I'd try this one first.
>
> I'm not sure if this bug started with -rc4, let's say somewhere between
> -rc3 and -rc6. I'll start with disabling MITIGATION_SPECTRE_BHI and then
> I'll disable them one by one.

It is starting to look like that MITIGATION_IBRS_ENTRY is causing my
problems. If I enable MITIGATION_IBRS_ENTRY I see the suspend stall
relatively quickly. And then I disable the config I have not been able
to reproduce the problem so far. But as this issue happens randomly I
want to do some more tests to be sure.

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