linux-kernel - Re: [PATCH v2] lkdtm/bugs: add test for hung smp_call_function

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Message-Id: <171864833734.3344563.14327987606116557799.b4-ty@kernel.org>
Date: Mon, 17 Jun 2024 11:19:00 -0700
From: Kees Cook <kees@...nel.org>
To: linux-kernel@...r.kernel.org,
	Mark Rutland <mark.rutland@....com>
Cc: Kees Cook <kees@...nel.org>,
	paulmck@...nel.org
Subject: Re: [PATCH v2] lkdtm/bugs: add test for hung smp_call_function_single()

On Wed, 15 May 2024 13:08:28 +0100, Mark Rutland wrote:
> The CONFIG_CSD_LOCK_WAIT_DEBUG option enables debugging of hung
> smp_call_function*() calls (e.g. when the target CPU gets stuck within
> the callback function). Testing this option requires triggering such
> hangs.
> 
> This patch adds an lkdtm test with a hung smp_call_function_single()
> callback, which can be used to test CONFIG_CSD_LOCK_WAIT_DEBUG and NMI
> backtraces (as CONFIG_CSD_LOCK_WAIT_DEBUG will attempt an NMI backtrace
> of the hung target CPU).
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] lkdtm/bugs: add test for hung smp_call_function_single()
      https://git.kernel.org/kees/c/51005a59bcbe

Take care,

-- 
Kees Cook