From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933991AbcLNWYQ (ORCPT ); Wed, 14 Dec 2016 17:24:16 -0500 Received: from ipmail05.adl6.internode.on.net ([150.101.137.143]:43107 "EHLO ipmail05.adl6.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933070AbcLNWYO (ORCPT ); Wed, 14 Dec 2016 17:24:14 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A2AYCwCAxVFYIAKzLHldHAEBBAEBCgEBgywLAQEBAQEfgWCGdoZYcpUAAQEBAQEHjVCECYRLggmGHAQCgXhAFAECAQEBAQEBAQYBAQEBAQE5RUIShFUcIxgkNAUlAwctiGqsY4sQMiCFVIZiAYNWhRUFiFyGJYFCiiiRIJBYSZFaH4E4Ew6DeQ0PGIFZKjSCI4YOAQEB Date: Thu, 15 Dec 2016 09:24:11 +1100 From: Dave Chinner To: linux-kernel@vger.kernel.org Cc: Lee Duncan , Chris Leech , open-iscsi@googlegroups.com Subject: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Message-ID: <20161214222411.GH4326@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi folks, Just updated my test boxes from 4.9 to a current Linus 4.10 merge window kernel to test the XFS merge I am preparing for Linus. Unfortunately, all my test VMs using iscsi failed pretty much instantly on the first mount of an iscsi device: [ 159.372704] XFS (sdb): EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk! [ 159.374612] XFS (sdb): Mounting V5 Filesystem [ 159.425710] XFS (sdb): Ending clean mount [ 160.274438] BUG: unable to handle kernel NULL pointer dereference at 000000000000000c [ 160.275851] IP: iscsi_tcp_segment_done+0x20d/0x2e0 [ 160.276565] PGD 336ed067 [ 160.276885] PUD 31b0d067 PMD 0 [ 160.277309] [ 160.277523] Oops: 0000 [#1] PREEMPT SMP [ 160.278004] Modules linked in: [ 160.278407] CPU: 0 PID: 16 Comm: kworker/u2:1 Not tainted 4.9.0-dgc #18 [ 160.279224] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 160.280314] Workqueue: iscsi_q_2 iscsi_xmitworker [ 160.280919] task: ffff88003e280000 task.stack: ffffc90000080000 [ 160.281647] RIP: 0010:iscsi_tcp_segment_done+0x20d/0x2e0 [ 160.282312] RSP: 0018:ffffc90000083c38 EFLAGS: 00010206 [ 160.282980] RAX: 0000000000000000 RBX: ffff880039061730 RCX: 0000000000000000 [ 160.283854] RDX: 0000000000001e00 RSI: 0000000000000000 RDI: ffff880039061730 [ 160.284738] RBP: ffffc90000083c90 R08: 0000000000000200 R09: 00000000000005a8 [ 160.285627] R10: 000000009835607d R11: 0000000000000000 R12: 0000000000000200 [ 160.286495] R13: 0000000000000000 R14: ffff8800390615a0 R15: ffff880039061730 [ 160.287362] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 [ 160.288340] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 160.289113] CR2: 000000000000000c CR3: 0000000031a8d000 CR4: 00000000000006f0 [ 160.290084] Call Trace: [ 160.290429] ? inet_sendpage+0x4d/0x140 [ 160.290957] iscsi_sw_tcp_xmit_segment+0x89/0x110 [ 160.291597] iscsi_sw_tcp_pdu_xmit+0x56/0x180 [ 160.292190] iscsi_tcp_task_xmit+0xb8/0x280 [ 160.292771] iscsi_xmit_task+0x53/0xc0 [ 160.293282] iscsi_xmitworker+0x274/0x310 [ 160.293835] process_one_work+0x1de/0x4d0 [ 160.294388] worker_thread+0x4b/0x4f0 [ 160.294889] kthread+0x10c/0x140 [ 160.295333] ? process_one_work+0x4d0/0x4d0 [ 160.295898] ? kthread_create_on_node+0x40/0x40 [ 160.296525] ret_from_fork+0x25/0x30 [ 160.297015] Code: 43 18 00 00 00 00 e9 ad fe ff ff 48 8b 7b 30 e8 da e7 ca ff 8b 53 10 44 89 ee 48 89 df 2b 53 14 48 89 43 30 c7 43 40 00 00 00 00 <8b [ 160.300674] RIP: iscsi_tcp_segment_done+0x20d/0x2e0 RSP: ffffc90000083c38 [ 160.301584] CR2: 000000000000000c Known problem, or something new? Cheers, Dave. -- Dave Chinner david@fromorbit.com