linux-kernel - Re: 答复: 答复: [PATCH] kdb: Fix the deadlock issue in KDB debugging.

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Message-ID: <20240312095756.GB202685@aspen.lan>
Date: Tue, 12 Mar 2024 09:57:56 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Liuye <liu.yeC@....com>
Cc: "jason.wessel@...driver.com" <jason.wessel@...driver.com>,
	"dianders@...omium.org" <dianders@...omium.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jirislaby@...nel.org" <jirislaby@...nel.org>,
	"kgdb-bugreport@...ts.sourceforge.net" <kgdb-bugreport@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: 答复: 答复: [PATCH] kdb:
 Fix the deadlock issue in KDB debugging.

On Tue, Mar 12, 2024 at 08:37:11AM +0000, Liuye wrote:
> I know that you said schedule_work is not NMI save, which is the first
> issue. Perhaps it can be fixed using irq_work_queue. But even if
> irq_work_queue is used to implement it, there will still be a deadlock
> problem because slave cpu1 still has not released the running queue
> lock of master CPU0.

This doesn't sound right to me. Why do you think CPU1 won't release the
run queue lock?


Daniel.