linux-kernel - Re: [PATCH 2/2] arm64: Fix watchpoint recursion when single-step is wrongly triggered in irq

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Message-ID: <20160321102423.GB15150@dhcppc6.redhat.com>
Date:	Mon, 21 Mar 2016 15:54:23 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	He Kuang <hekuang@...wei.com>
Cc:	catalin.marinas@....com, will.deacon@....com, mark.rutland@....com,
	Dave.Martin@....com, hanjun.guo@...aro.org, james.morse@....com,
	yang.shi@...aro.org, gregkh@...uxfoundation.org,
	marc.zyngier@....com, richard@....at, wangnan0@...wei.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: Fix watchpoint recursion when single-step is
 wrongly triggered in irq

On 21/03/2016:08:37:50 AM, He Kuang wrote:
> On arm64, watchpoint handler enables single-step to bypass the next
> instruction for not recursive enter. If an irq is triggered right
> after the watchpoint, a single-step will be wrongly triggered in irq
> handler, which causes the watchpoint address not stepped over and
> system hang.

Does patch [1] resolves this issue as well? I hope it should. Patch[1] has still
not been sent for review. Your test result will be helpful.

~Pratyush

[1] https://github.com/pratyushanand/linux/commit/7623c8099ac22eaa00e7e0f52430f7a4bd154652