linux-kernel - Re: [BUG] CoreSight: WARN_ON in coresight_disclaim_device_unlocked due to register reset on CPU power-cycle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250620101906.3762866-1-keyz@google.com>
Date: Fri, 20 Jun 2025 18:19:06 +0800
From: Keita Morisaki <keyz@...gle.com>
To: suzuki.poulose@....com
Cc: alexander.shishkin@...ux.intel.com, coresight@...ts.linaro.org, 
	ericchancf@...gle.com, james.clark@...aro.org, keyz@...gle.com, 
	leo.yan@....com, linux-kernel@...r.kernel.org, mike.leach@...aro.org, 
	yimingtseng@...gle.com
Subject: Re: [BUG] CoreSight: WARN_ON in coresight_disclaim_device_unlocked
 due to register reset on CPU power-cycle

Hi,
(Resending the same message in plain text (no HTML). The previous message was rejected by the mailing list because it contained HTML.)
thank you so much for the quick response. Really appreciate it.

> Thanks for the report ! In the future, please use
> scripts/get_maintainer.pl for the clear list of people/list
> for reporting issues.

I will do that!

> We have the ETM driver performing the save/restore of ETM context during
> a CPUidle. This is only done when the ETM/ETE is described to be loosing
> context over PM operation. If this is not done (via DT), the driver
> doesn't do anything. This could be problematic. Could you try adding:
>
> "arm,coresight-loses-context-with-cpu"
>
>
> property to the ETE nodes and see if it makes a difference ?

Noted. We will try this and get back to you.

Best,
Keita