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 86A431BCA1F for ; Fri, 16 Aug 2024 16:40:20 +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=1723826420; cv=none; b=RZCU6qXJNy43kM3rBa614twkUEKW+vEfa+Zx3G37aaGKfjKNOvr8XLq7YgG/53jk/FAcUA4dVnXCI/Fzc/AHvuHp0QbEq8ABrWBmm57rSZbI5ncZ7QIalLD3CCdgDZCpdbBABQxXOEwJ5A2jqVsuuILeIXBRUmtOw0r7EEwBLZ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723826420; c=relaxed/simple; bh=U0+9DKtnf4aS9jcGmNovqrmBPHtN+/euLmox9F+Eokc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=UGiDg9wvUJS0XuM3w8CbR7/zilfvwEVF0sEfCeT0aWslhGTUalKNlwUT8isllrI0nyJnndFZ651vvX+qiXKKGLz2EjiqehoD8S8crBctVHV2xlmx9o8rCYUvE68QdBaFq6/744WF0oVGKoP1WGY/fFwQUVXmkxCDkkAq4TE4OO8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ig7qOA4l; 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="ig7qOA4l" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1D714C32782 for ; Fri, 16 Aug 2024 16:40:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723826420; bh=U0+9DKtnf4aS9jcGmNovqrmBPHtN+/euLmox9F+Eokc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=ig7qOA4lVyGdTYc+pbpGfg8tKKMCyhLjEfy4FDMYs4/ZsLbhGI3sbsupPWjHfFPsA GHzAhC++rp+NwD/RUa8ORqbx68DTlHw8zNoekqELL2HYO3Xu8xOTtUG4kye4MezaW2 3+NmBiv4qz+7Zi7h+1Q+V8FInA/s4u5TKf3spauLxlh1p+B+pC+c8i9NOWL/R9hUjT 0WJdpaO3GkQTmybP8E5Vq0YIcWKatZ1NQztR4Y5N/k3vfzZ+6uF9DoQiADsXEBEy+/ rVApKNibaOuvMw5MhiMW0902gGMIAxYBYgJCZGEB0pt7FCOX3S1MKjN7eZbS2YGB/p qc6YcUW1Q5etg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 08F45C53B7F; Fri, 16 Aug 2024 16:40:20 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-ext4@vger.kernel.org Subject: [Bug 219166] ext4 hang when setting echo noop > /sys/block/sda/queue/scheduler Date: Fri, 16 Aug 2024 16:40:19 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo fs_ext4@kernel-bugs.osdl.org X-Bugzilla-Product: File System X-Bugzilla-Component: ext4 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: tytso@mit.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: fs_ext4@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc 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-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D219166 Theodore Tso (tytso@mit.edu) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |tytso@mit.edu --- Comment #1 from Theodore Tso (tytso@mit.edu) --- This is a bug in the block layer, not in ext4. It's also a fairly long-standing issue; I remember seeing something like in our Data Center kernels at $WORK at least five plus years ago. At the time, we dealt with this via the simple expedient of "Doctor, Doctor, it hurts when I do that.= =20 Well, then don't do that then!" At the time it happened relatively rarely; if you're able to reliably repro= duce it, perhaps it would be useful to send a script with said reliable reproduc= er to the linux-block list, and perhaps try to do a bisect to see when it beca= me trivially easy to trigger. --=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.=