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 D27396F2F8 for ; Fri, 16 Aug 2024 17:06:33 +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=1723827994; cv=none; b=cf4zuAl22kJMiptmd1qPJYCIi1wQ6cz2ukzY58dOIln6fKu1Ym6ju65BJfC7bZZmXsG2gPqumW/P9PE3L/HPAXi8q8palcxeKvGxEbkAKMtKngRV1XaDUKjMcTytsIq4pCZTjGo6sx2hqvNCDiENVYRGYjmNc8ZJLu+2wsfByyk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723827994; c=relaxed/simple; bh=0oYa0RlLwMTVcRcImFMU//04pqEq9bygN+syLbHIhRE=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=kiCeAwaJceEBD27zf3KS24H8zH9+u0uq1o4Hj+OMJt9j/gbYesN+L5CJ1JohoPUOZS7g6lpwCE6Rz32yijFWGOpiBhRkkczAGgYxrNWgb85QXa/MLu7KIX4GTenYdigw+Dw/8Ch+6lbUVcHviA800Gsu9+BTXah+SQenxE5xF04= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lHV9MI4y; 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="lHV9MI4y" Received: by smtp.kernel.org (Postfix) with ESMTPS id 69273C4AF0B for ; Fri, 16 Aug 2024 17:06:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723827993; bh=0oYa0RlLwMTVcRcImFMU//04pqEq9bygN+syLbHIhRE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=lHV9MI4ysTLTyteSHdfv12LgKRCBpCjT/eQSS7G+05Xpk2aZh216xxwdiORY8KOid G78DCqOauCJXzkY4TswQTQuRpKDPfVMcyzKw/DoEtGjivKhuwXfGSUfYxvKsXSqYXt KPNWlFKNudbfHdFDdvI2OaiXFgPrrez9snFM3iFhofEPP03m1Yn4uMvSnufwe9PFtd oIQPcezeLjGlbc0ZM41HdofQ4e1+h1eXwbqml+YXb0VVNl7pCGIim7daibaWHoXPCN Wvp7Ni8dmPf+OsuL0HNLHxkFCN+IzJC5FGGxWrFCVtUyOzdDltneqZd2FmX1Gw+qBy QfAjIKHb/ehSA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 4E130C53B7F; Fri, 16 Aug 2024 17:06:33 +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 17:06:33 +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: rjones@redhat.com 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: 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 --- Comment #2 from Richard W.M. Jones (rjones@redhat.com) --- We did indeed work around it by not doing it: https://github.com/libguestfs/libguestfs/commit/b2d682a4730ead8b4ae07e5aaf6= fa230c5eec305 so my interest in this bug is now limited. If you want to close it then th= at's fine. It's unfortunately triggered very rarely. The only test I have is: $ while guestfish -a /dev/null run -vx >& /tmp/log ; do echo -n . ; done but that hits the bug less than 1 in 200 iterations (although more often wh= en run in a qemu VM using software emulation, which is where we first hit this= .) I tried to write something that could trigger it more frequently by having a loop in a guest writing to queue/scheduler, while another loop in the guest would write to the disk, but I couldn't seem to hit the bug at all. --=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.=