From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933653AbbFJNkf (ORCPT ); Wed, 10 Jun 2015 09:40:35 -0400 Received: from arcturus.aphlor.org ([188.246.204.175]:47724 "EHLO arcturus.aphlor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754268AbbFJNk1 (ORCPT ); Wed, 10 Jun 2015 09:40:27 -0400 Date: Wed, 10 Jun 2015 09:40:17 -0400 From: Dave Jones To: clm@fb.com Cc: jbacik@fb.com, dsterba@suse.cz, Linux Kernel Subject: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c Message-ID: <20150610134017.GA14803@codemonkey.org.uk> Mail-Followup-To: Dave Jones , clm@fb.com, jbacik@fb.com, dsterba@suse.cz, Linux Kernel MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-Score: -2.9 (--) X-Spam-Report: Spam report generated by SpamAssassin on "arcturus.aphlor.org" Content analysis details: (-2.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-Authenticated-User: davej@codemonkey.org.uk Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Found this on serial console this morning. The machine had rebooted itself shortly afterwards (surprising, given I don't have panic-on-oops or similar set). Dave page:ffffea0002b0a040 count:4 mapcount:0 mapping:ffff8800abf76ad0 index:0x0 flags: 0x4000000000000806(error|referenced|private) page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) ------------[ cut here ]------------ kernel BUG at mm/filemap.c:745! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC CPU: 1 PID: 32187 Comm: trinity-c3 Not tainted 4.1.0-rc7-gelk-debug+ #4 task: ffff8800b6bd0a50 ti: ffff8800abf50000 task.ti: ffff8800abf50000 RIP: 0010:[] [] unlock_page+0x7c/0x80 RSP: 0000:ffff8800abf53a58 EFLAGS: 00010292 RAX: 0000000000000036 RBX: 0000000000001000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffffb00c9e29 RDI: ffffffffb00c9a44 RBP: ffff8800abf53a58 R08: 0000000000000001 R09: 00000000000007f9 R10: 0000000000000478 R11: ffff8800bb20e848 R12: ffffea0002b0a040 R13: 0000000000000000 R14: 0000000000000fff R15: 0000000000000000 FS: 00007f9c1ea80700(0000) GS:ffff8800bf700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3ca086f850 CR3: 00000000a8ceb000 CR4: 00000000000007e0 DR0: 00007f1c6d7b0000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: ffff8800abf53b68 ffffffffc015c5ec 0000000000000fff 0000100800000008 ffff8800abf76778 0000000000000000 ffff8800abf53ab8 0000000000000fff 0000000000000000 ffff8800ac281000 ffff8800abf53c08 ffff8800abf76958 Call Trace: [] __do_readpage+0x61c/0x7c0 [btrfs] [] ? lock_extent_bits+0x83/0x2e0 [btrfs] [] ? get_parent_ip+0x11/0x50 [] ? btrfs_real_readdir+0x5e0/0x5e0 [btrfs] [] ? btrfs_lookup_ordered_extent+0x9a/0xd0 [btrfs] [] __extent_read_full_page+0xc5/0xe0 [btrfs] [] ? btrfs_real_readdir+0x5e0/0x5e0 [btrfs] [] extent_read_full_page+0x37/0x60 [btrfs] [] btrfs_readpage+0x25/0x30 [btrfs] [] prepare_uptodate_page+0x4a/0x90 [btrfs] [] prepare_pages+0x101/0x190 [btrfs] [] __btrfs_buffered_write+0x1d3/0x650 [btrfs] [] btrfs_file_write_iter+0x463/0x570 [btrfs] [] __vfs_write+0xb1/0xf0 [] vfs_write+0xa9/0x1b0 [] ? mutex_lock+0x2c/0x40 [] SyS_write+0x49/0xb0 [] ? context_tracking_user_enter+0x13/0x20 [] ? syscall_trace_leave+0x95/0x140 [] system_call_fastpath+0x12/0x6a Code: 10 48 d3 ee 48 8d 0c b6 48 89 c6 48 8d 3c ca 31 d2 e8 59 ab f4 ff 5d c3 0f 1f 80 00 00 00 00 48 c7 c6 10 f4 a2 b0 e8 14 87 02 00 <0f> 0b 66 90 66 66 66 66 90 55 85 f6 48 89 e5 75 13 85 d2 74 3f