From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752501Ab2BUQXO (ORCPT ); Tue, 21 Feb 2012 11:23:14 -0500 Received: from mail-we0-f174.google.com ([74.125.82.174]:56904 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751394Ab2BUQXN (ORCPT ); Tue, 21 Feb 2012 11:23:13 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of levinsasha928@gmail.com designates 10.180.90.212 as permitted sender) smtp.mail=levinsasha928@gmail.com; dkim=pass header.i=levinsasha928@gmail.com Message-ID: <1329841429.10124.38.camel@lappy> Subject: 9p: BUG: unable to handle kernel paging request at ffff880035698000 From: Sasha Levin To: ericvh@gmail.com, rminnich@sandia.gov, lucho@ionkov.net Cc: "linux-kernel@vger.kernel.org" , v9fs-developer@lists.sourceforge.net, Dave Jones Date: Tue, 21 Feb 2012 18:23:49 +0200 Content-Type: text/plain; charset="us-ascii" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I was using the KVM tool for tests with trinity on top of a virtio-9p filesystem, and started seeing the BUGs below when I've put some pressure on the 9p fs (not much, just started writing the logs from trinity to a 9p fs). This reproduces not so easily, but it happens 2-3 times a day. [ 156.384520] BUG: unable to handle kernel paging request at ffff880035698000 [ 156.386845] IP: [] p9_release_pages+0x43/0x60 [ 156.388766] PGD 321d063 PUD 3221063 PMD 1ffa9067 PTE 35698160 [ 156.388766] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 156.393871] CPU 0 [ 156.393871] Pid: 10293, comm: trinity Not tainted 3.3.0-rc4-next-20120220-sasha-00003-g949d91b #14 [ 156.400127] RIP: 0010:[] [] p9_release_pages+0x43/0x60 [ 156.402161] RSP: 0018:ffff8800356edbf8 EFLAGS: 00010202 [ 156.402161] RAX: 0000000000000001 RBX: ffff880035697ff8 RCX: 0000000000000000 [ 156.402161] RDX: ffff8800330cb000 RSI: 0000000000000001 RDI: ffffea0000cfed40 [ 156.402161] RBP: ffff8800356edc18 R08: 0000000000000001 R09: 0000000000000000 [ 156.402161] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 156.407866] R13: 0000000000000001 R14: ffff880038a58070 R15: 0000000000000000 [ 156.407866] FS: 00007fb4bf398700(0000) GS:ffff88003de00000(0000) knlGS:0000000000000000 [ 156.407866] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 156.410381] CR2: ffff880035698000 CR3: 00000000355b2000 CR4: 00000000000406f0 [ 156.410949] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 156.410949] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 156.413619] Process trinity (pid: 10293, threadinfo ffff8800356ec000, task ffff8800330cb000) [ 156.415369] Stack: [ 156.415369] ffff8800356edc98 ffff8800356edc98 0000000000000000 ffff8800356edc98 [ 156.417242] ffff8800356edcf8 ffffffff825bed35 0000000000000076 0000000000000017 [ 156.417242] ffff8800356edcb0 ffff8800330cb000 0000000000001000 0000000000000286 [ 156.417242] Call Trace: [ 156.417242] [] p9_virtio_zc_request+0xd5/0x510 [ 156.417242] [] ? wake_up_bit+0x40/0x40 [ 156.417242] [] p9_client_zc_rpc+0xe8/0x4f0 [ 156.417242] [] ? sched_clock_local+0x25/0x90 [ 156.417242] [] ? get_parent_ip+0x11/0x50 [ 156.424263] [] ? get_parent_ip+0x11/0x50 [ 156.424263] [] p9_client_write+0xe2/0x1e0 [ 156.424263] [] v9fs_file_write_internal+0x65/0x140 [ 156.424263] [] v9fs_file_write+0x8c/0xb0 [ 156.424263] [] vfs_write+0xc8/0x190 [ 156.424263] [] sys_write+0x4f/0x90 [ 156.424263] [] system_call_fastpath+0x16/0x1b [ 156.424263] Code: ff 74 31 85 f6 74 2d 45 31 e4 eb 0e 0f 1f 40 00 45 39 e5 0f 1f 44 00 00 74 1a 66 0f 1f 44 00 00 e8 53 ef bb fe$ [ 156.432262] RIP [] p9_release_pages+0x43/0x60 [ 156.432262] RSP [ 156.434735] CR2: ffff880035698000