linux-kernel - Re: Commit 81a43adae3b9 (locking/mutex: Use acquire/release semantics) causing failures on arm64 (ThunderX)

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: <20151211095946.GC18828@arm.com>
Date:	Fri, 11 Dec 2015 09:59:46 +0000
From:	Will Deacon <will.deacon@....com>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	Davidlohr Bueso <dbueso@...e.de>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Pinski, Andrew" <Andrew.Pinski@...iumnetworks.com>
Subject: Re: Commit 81a43adae3b9 (locking/mutex: Use acquire/release
 semantics) causing failures on arm64 (ThunderX)

On Thu, Dec 10, 2015 at 11:43:46AM -0800, David Daney wrote:
> We are getting soft lockup OOPs on Cavium CN88XX (A.K.A. ThunderX), which is
> an arm64 implementation.

[...]

> At this point it is unknown if this patch is incorrect, or if the underlying
> ARM64 atomic_*_{acquire,release} primitives are defective, or if the problem
> lies elsewhere.

Are you using the ll/sc or lse versions of the atomics? In the case of
the former, are they inline or out-of-line (this depends on whether or
not you've selected CONFIG_ARM64_LSE_ATOMICS and whether or not you have
toolchain support)?

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/