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 890882BD5AF for ; Tue, 27 Jan 2026 23:15:49 +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=1769555749; cv=none; b=WLPUU4CUT3RI/lNfiorIcqNnN4YlImhEmBiGcDiQtmJGWH34KXHqY26hra7FnsUbdWaxqrkmafXfVRzd3UbBPKQlxtrBKrnaUAvvxEpSrO+mEm0vDiPzRM++K9xGX6ToVKydeAW6NEq5TwXZicKWeGDatKYGV3DUxMFEfdHZ6BI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769555749; c=relaxed/simple; bh=jAG5EzF+Cm7Ii8y3KSZYdeZ50dIRSVGg+ZhYrx6mE90=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=icKy0MwUFFb4MGThV0eKVmkisbsyE69k4JUusIg0kNP2Jh1DHOehXZkDPRj8JCiSasJzYpgqi0D+DggB5vwsquVAApJT/3fBNEmzsDtE/BvahYHTOKw2piw/giRKDf1A+H/m30lGQU+4ckn0Nkom2KZFLIRVwqFYzi0cnHxYcuo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=OxfFvnVl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="OxfFvnVl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A9A7EC116C6; Tue, 27 Jan 2026 23:15:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1769555749; bh=jAG5EzF+Cm7Ii8y3KSZYdeZ50dIRSVGg+ZhYrx6mE90=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=OxfFvnVl6abOeknXe3dQ3T9pkihwDifP+qa56OUrA6XClh4ljf3+9433rMBjsHNa2 RkNL6UmpLEJjBsOrNYqNYiN/lHfFv7AQeZH1QOI4dpT0+ENkML/ZFdSLSoh8wRA8Jf nsYKPxApFiiem/5GFPF6SvfBkRfl+qHPNGjqwoNw= Date: Tue, 27 Jan 2026 15:15:48 -0800 From: Andrew Morton To: Mark Brown Cc: "Liam R. Howlett" , maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Suren Baghdasaryan , Matthew Wilcox , Sidhartha Kumar , Vlastimil Babka , Alice Ryhl , Kuninori Morimoto , Geert Uytterhoeven , Arnd Bergmann , Christian Kujau , Aishwarya.TCV@arm.com Subject: Re: [PATCH v2 22/29] maple_tree: Use maple copy node for mas_wr_rebalance() operation Message-Id: <20260127151548.b57825c664d36fbff70ffa7c@linux-foundation.org> In-Reply-To: References: <20260121164526.2093265-1-Liam.Howlett@oracle.com> <20260121164526.2093265-23-Liam.Howlett@oracle.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 27 Jan 2026 23:05:48 +0000 Mark Brown wrote: > On Wed, Jan 21, 2026 at 11:45:19AM -0500, Liam R. Howlett wrote: > > Stop using the maple big node for rebalance operations by changing to > > more align with spanning store. The rebalance operation needs its own > > data calculation in rebalance_data(). > > > > In the event of too much data, the rebalance tries to push the data > > using push_data_sib(). If there is insufficient data, the rebalance > > operation will rebalance against a sibling (found with rebalance_sib()). > > I'm seeing a test failure in the LTP linkat02 test on arm64 which we're > also seeing on a range of platforms in the Arm lab. A NULL pointer > deference is generated handling the syscall in the updated code (log for > the actual next-20260126 commit): Cool, thanks. Liam, I'll move this series back into mm-new to avoid disrupting linux-next testing.