linux-kernel - Re: [regression] suspend stress test stalls within 30 minutes

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Message-ID: <20240511184847.GCZj-9j2sh1Akpt9iS@fat_crate.local>
Date: Sat, 11 May 2024 20:48:47 +0200
From: Borislav Petkov <bp@...en8.de>
To: Kalle Valo <kvalo@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>, x86@...nel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	regressions@...ts.linux.dev,
	Jeff Johnson <quic_jjohnson@...cinc.com>
Subject: Re: [regression] suspend stress test stalls within 30 minutes

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
> -MITIGATION_SRSO y
> -MITIGATION_UNRET_ENTRY y
> -PREFIX_SYMBOLS y
>  CPU_MITIGATIONS y -> n

You could start turning them off one-by-one, and each time run the
reproducer and see where there's a difference.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette