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 D799A1E4A7 for ; Tue, 28 Nov 2023 19:04:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b8OGqtm6" Received: by smtp.kernel.org (Postfix) with ESMTPS id 5EB98C43391 for ; Tue, 28 Nov 2023 19:04:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701198261; bh=M6HyDu8KLSH4xh6JjCdOzbqUNbQDhtq1XnEjVOs8bzA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=b8OGqtm63Q9YOH5Xxw3dZHutPw+ZR62enEv18w6FqwCtp82EO0vbO5fGyLtaxZkKZ o+nnOSB8CMIwVlg1erd4lIixaSRiyKV7H4PLX61mEUkvMv8dC2RiQqkVu/78BSIlK5 n0JP3x6/E0OwMhBQHccMhq+b1iqe1sxaVIvPdfdpmjfsRqpVBMJj5B/5iResQ8TEWn xnVQWSw4j9TXLIr+BS0I63i/7ZN/FqBOQFmMdHpHKwHeq+Fv+dLr5FoBvAgksKcgD0 N5SeUD+D+H+8kve8a/m21e0g0nf1P4DtM9ud/fzS+X9h/hWzoNcKaah9+Z8MOdUSHD Em2BQtVa87Z0A== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 4E55AC53BD2; Tue, 28 Nov 2023 19:04:21 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 215740] kernel warning: DMA-API: xhci_hcd: cacheline tracking EEXIST, overlapping mappings aren't supported Date: Tue, 28 Nov 2023 19:04:20 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: stern@rowland.harvard.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D215740 --- Comment #35 from Alan Stern (stern@rowland.harvard.edu) --- So as most of the people subscribing to this bug have seen from the email discussion, it looks like the bug ultimately lies in the alignment of kmall= oc() buffers and it probably will be fixed with a kernel patch. Equally important, however, is the question of why the people experiencing = this problem turned on CONFIG_DMA_API_DEBUG in the first place. That setting is meant only for kernel testing and it drastically reduces performance. Redh= at certainly should not enable it in any of their distribution kernels (and in fact it is not set in my copy of Fedora 38). Andrew, Ferry, any comments? --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=