From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DCCF829CB24 for ; Thu, 19 Mar 2026 13:47:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773928030; cv=none; b=i+GJLP4QuHzZ1P2usvZxSMNXquR5dW1oHWuou9gXiBdrV/jpUbdZ2KlmPnZ7Lq4m6Ivm4/FpkbWjPkC//SDel4Ah8lU+XxDVR+3urWsHbj9ej+HiWrnMFWBjyTrZAnWG+qbHktdVjvEg2gcmPSpGX3K/HPerjFZSB/WQORnnHjY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773928030; c=relaxed/simple; bh=IovFIhU9Whe7SkiApKWssYxKynCZvyqWHPTnZpKRs6Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=STV0bOLJwNWgeMtkmA5b2UC5skCQ6n3zFaEd/OnwtwFD74H0VyyBJQ+FJzAr7Uu9/3qnWFr3t94VVAJNEtOhmzxnHWFwOUBbR3wIgzM4F0J+rwTZMsoEd8RTdrerWx9ynbsj4fJl6lnvzcslMGtNkjtkDhQwEgcSVV8sZjn7lXw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VvEBqZx5; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VvEBqZx5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A41BC19424; Thu, 19 Mar 2026 13:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773928029; bh=IovFIhU9Whe7SkiApKWssYxKynCZvyqWHPTnZpKRs6Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VvEBqZx5FR85aByvF5J/as36tm94MpbMtcgsWkPAVF22ID7/5LGvcB14eL7xdpFkK Ix5Tsiim/yjVeu9dNi8lX8eOJTF1ICb8E4fstwXm6wVeRRe7oWJjhWN2gSH/D3hD+a r9z/fG/qO4Tc3CRZiG3Ccso/oS+/Y0QHeie3bIhw5RyPMhuLi+oX686oGbc3FCroAn tV3a7e3zTFe1TGEugp9XzSRlwNR2QnQxXtL0Xh8fwNWmYgRmveiKJQ46mhHc9MbTZD 9nAVbgr3/aXS1UXbaw7C7Gz7iZRmo93v6VnppD0mmD9iBOm5iJJ3kzTmwyN4tcIFQs 4szNu/YZEFa1g== Date: Thu, 19 Mar 2026 13:47:04 +0000 From: Mark Brown To: Peter Zijlstra Cc: "Matthew Wilcox (Oracle)" , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , linux-kernel@vger.kernel.org, Aishwarya.TCV@arm.com Subject: Re: [PATCH 1/3] rwsem: Remove the list_head from struct rw_semaphore Message-ID: <3cc82bae-9d87-438d-b134-e7d75d116cf7@sirena.org.uk> References: <20260305195545.3707590-1-willy@infradead.org> <20260305195545.3707590-2-willy@infradead.org> <78e16f40-28f1-4dcb-a5ab-b2a29e43f048@sirena.org.uk> <20260318202851.GL3738010@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="KlOjd8DJ8UdFEPNH" Content-Disposition: inline In-Reply-To: <20260318202851.GL3738010@noisy.programming.kicks-ass.net> X-Cookie: Given my druthers, I'd druther not. --KlOjd8DJ8UdFEPNH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Mar 18, 2026 at 09:28:51PM +0100, Peter Zijlstra wrote: > On Wed, Mar 18, 2026 at 07:07:24PM +0000, Mark Brown wrote: > > On Thu, Mar 05, 2026 at 07:55:41PM +0000, Matthew Wilcox (Oracle) wrote: > > In the past few days we've started seeing lockups when running LTP on > > -next on a range of arm64 platforms which bisect to this patch. It > > looks like corruption of some kind, the exact trigger varies but it's > > very predictable that something goes wrong and we get lots of rwsem > > related backtraces which do seem relevant to this commmit. This one > > seems reasonably typical: > I merged the fix in todays branch: > https://lkml.kernel.org/r/177382097549.1647592.8219974128268935080.tip-bot2@tip-bot2 Ah, excellent timing :/ - I'll let you know if there are still issues going forwards. --KlOjd8DJ8UdFEPNH Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmm7/lcACgkQJNaLcl1U h9B9uAf8CawUxlsCzCRKiokQGrpIvGb6XawgYIifq6io7YzsicoenMYuTrNFUN1Z cACp8AyRzC1vCYxoOaFV9b8cV9yE0ip99MFU1ZUn95knJSPjihDUubww/3zEhUzQ JRexhfzMnLpuIk5TTgR3egsNNZScoh1Li916Q7FbWZDPKZT9OFFFJzO78awh1MQi iIiP/aGBn/khLQk6xO/d1FeBD4chgY1SdV6lu9W8qeoRIoUDIXeyHqdSCdD5Knlq 4KesEh+BqJ+iINGuFxmNIKXyKEDb4tsOmPvQJ7P3H6xQmCqqiL3iEImYsCbXmjoA KcpzDZx6ZOE+aHjnqdwSDo9/aeyTdw== =y/A7 -----END PGP SIGNATURE----- --KlOjd8DJ8UdFEPNH--