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 3E79B392C25 for ; Mon, 3 Aug 2026 13:24:22 +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=1785763463; cv=none; b=rMVuQE3zueQwpSIR3uyyVoAFGGg+VmMum8qmNgcvFeO1kMu+9mm6zIZg/Q3TBymmXExpVtut+x/ZJA08bsNtPafdwzn28nRbX5KKgbRr6+YnqVrkeopkc6qruv2xn9p1I7a1KaQ1nq3gycphhDhS9IDCRpW2J8urySOv6YWxfyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785763463; c=relaxed/simple; bh=W1djI4dHt9J6W2YZZbiUKPFR/+aZEQNczVX8UCmnIa0=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=UQUXtQpoRr206toAIM4b5goSZc0zDOzW32+2TZuPKFcE9rd4IwcJLeZLtV5+jmdrcvPdn5akokiUqPLKx6DGrP/y7PCo/shsNUazg+Gc9OI+SjAvvT/nipeGJ0TxLJcz0qU5u/rwFtsNQ3E70/Zd6I0dQ3XHg9h8a0F9f1Vrwzo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ntjFO6i/; 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="ntjFO6i/" Received: by smtp.kernel.org (Postfix) with ESMTPS id 14A74C2BCF7 for ; Mon, 3 Aug 2026 13:24:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1785763461; bh=W1djI4dHt9J6W2YZZbiUKPFR/+aZEQNczVX8UCmnIa0=; h=From:To:Subject:Date:From; b=ntjFO6i/nmpUOx4cxZ7dMTdjkcDzGtz7/DjfMuhdkEKcvv9Cmt7vXYrioM6sQs+6d SsfffKXq2DbbuW7NqDYBfrLkyA55KawoeBzIdyxgj06q3VP4s7euUDwHyOD9AaCAFp d+pu+f6PXeUe4z9FBp+8bC9kqgGJGwfQ3GgFT1AlIdr5/GAOTnBj5xMpnVrQq4u4di DiCkcvzyqNILQuc9zGYVeOpRhBu8SQkGvyGiLrWyJS5pfO8gDZIdd4sYwB+aLf9fUL Ct+Jwc8qb+NLiXmAIWJnDCxJ7DTJCsMYONQ8vpUth5MZ9C0tnJYAEwebtEhK2REgMC xw8JZXAokpM4w== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 008FBC53BC7; Mon, 3 Aug 2026 13:24:20 +0000 (UTC) From: bugzilla-daemon@kernel.org To: kvm@vger.kernel.org Subject: [Bug 221828] New: Windows 11 blue screen 0xc0000185 when using disk cache none on newer kernels Date: Mon, 03 Aug 2026 13:24:20 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: samuilsgames@protonmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression Message-ID: 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: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D221828 Bug ID: 221828 Summary: Windows 11 blue screen 0xc0000185 when using disk cache none on newer kernels Product: Virtualization Version: unspecified Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: kvm Assignee: virtualization_kvm@kernel-bugs.osdl.org Reporter: samuilsgames@protonmail.com Regression: No Dear Linux developers, I have noticed an odd bug that makes Windows 11 crash early during boot with error code 0xc0000185: 1. Create a QEMU/KVM guest with the Windows 11 preset 2. Change cache mode to none for the the virtual disk the guest OS is insta= lled to 3. Install the OS 4. On the first, the error code appears. Changing the cache mode back to writeback (QEMU's default), the blue screens don't happen anymore. I kept virt-manager's defaults everywhere else. Anoth= er workaround was downgrading Linux from 6.18.41 to 6.12.100. The problem also happens on Linux 7.1.5. NixOS makes it hard to install EOL kernels, so I haven't tested which minor release actually added the regression. Lastly, Windows 10 doesn't seem to be affected and GNU/Linux distros for that matte= r. My setup is this: CPU: AMD Ryzen 7 3700X Host OS: NixOS unstable Host Kernel: Linux 6.18.41 Host FS: F2FS QEMU: 11.0.2 Guest OS: Windows 11 Pro (25H2), Windows 11 IoT Enterprise LTSC (24H2) Is this a known issue? I couldn't find anything on it. Are there any logs I= can post? Thanks in advance! Best regards, Samuil --=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.=