From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Priebe - Profihost AG <s.priebe-2Lf/h1ldwEHR5kwTpVNS9A@public.gmane.org>
Subject: kernel 3.10 + applied bcache patches unable to handle kernel NULL
 pointer dereference
Date: Thu, 04 Jul 2013 11:39:55 +0200
Message-ID: <51D542EB.7070404@profihost.ag>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
Return-path: <linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: linux-bcache@vger.kernel.org

Hello list,

after applying the latest patches from the bcache branch on top of
kernel 3.10.

I get the following backtrace while booting my system.


 BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0
 IP: [<ffffffffa00fbe07>] bcache_dev_sectors_dirty_add+0x17/0x90 [bcache]
 PGD c44e83067 PUD c45480067 PMD 0
 SMP
 usb 2-1: new high-speed USB device number 2 using ehci-pci
 Modules linked in: bcache sd_mod ahci ehci_pci libahci ehci_hcd isci(+)
libsas usbcore igb usb_common scsi_transport_
sas i2c_algo_bit i2c_core ptp pps_core ixgbe(O+)
 CPU: 1 PID: 381 Comm: bcache-register Tainted: G           O 3.10.0+2-ph #1
 Hardware name: Supermicro
X9SRE/X9SRE-3F/X9SRi/X9SRi-3F/X9SRE/X9SRE-3F/X9SRi/X9SRi-3F, BIOS 2.0a
04/19/2013
 task: ffff880c476bcaa0 ti: ffff880c44544000 task.ti: ffff880c44544000
 RIP: 0010:[<ffffffffa00fbe07>]  [<ffffffffa00fbe07>]
bcache_dev_sectors_dirty_add+0x17/0x90 [bcache]
 RSP: 0018:ffff880c44545850  EFLAGS: 00010246
 RAX: 00000000fffffff8 RBX: ffff880c437464d0 RCX: ffff880c43ef0000
 RDX: 000000001d1c1810 RSI: 0000000000000001 RDI: ffff880c43ee0000
 RBP: ffff880c44545858 R08: 0000000000000000 R09: 0000000000000000
 R10: 0000000000000001 R11: 0000000000000001 R12: ffff880c44545c70
 R13: ffff880c44545c08 R14: ffff880c43aa9000 R15: ffff880c44545968
 FS:  00007f545ab31700(0000) GS:ffff880c7fc20000(0000)
knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00000000000000a0 CR3: 0000000c457bf000 CR4: 00000000000407e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
 Stack:
  ffff880c437464d0 ffff880c44545948 ffffffffa00f204d 0000000000000013
  ffff880c445459c0 0000000000000010 ffff880c44545968 0000000000000008
  0000000000000001 0000000000000001 8000000000000001 0000000000000008
 Call Trace:
  [<ffffffffa00f204d>] fix_overlapping_extents+0x2ed/0x620 [bcache]
  [<ffffffffa00f6f47>] ? __bch_bset_search+0xa7/0x260 [bcache]
  [<ffffffffa00f7cff>] ? __bch_btree_iter_init+0x7f/0xd0 [bcache]
  [<ffffffffa00f2464>] btree_insert_key+0xe4/0x410 [bcache]
  [<ffffffffa00f2a37>] bch_btree_insert_keys+0xc7/0xf0 [bcache]
  [<ffffffffa00f545f>] bch_btree_insert_recurse+0xbf/0x530 [bcache]
  [<ffffffffa00f5a19>] bch_btree_insert+0x149/0x320 [bcache]
  [<ffffffffa00fb1fd>] bch_journal_replay+0x15d/0x2a0 [bcache]
  [<ffffffffa01057d9>] run_cache_set+0x2e9/0x5e0 [bcache]
  [<ffffffffa01061cf>] register_cache_set+0x20f/0x2d0 [bcache]
  [<ffffffffa0103a61>] ? cache_alloc+0x4e1/0x500 [bcache]
  [<ffffffffa0106377>] register_cache+0xe7/0x190 [bcache]
  [<ffffffffa010660e>] register_bcache+0x1ee/0x320 [bcache]
  [<ffffffff8129e717>] kobj_attr_store+0x17/0x20
  [<ffffffff811af36d>] sysfs_write_file+0xdd/0x160
  [<ffffffff8114039f>] vfs_write+0xdf/0x1a0
  [<ffffffff811408ea>] SyS_write+0x5a/0xa0
  [<ffffffff81525e52>] system_call_fastpath+0x16/0x1b
 Code: 00 00 00 00 b8 01 00 00 00 c9 c3 66 0f 1f 84 00 00 00 00 00 55 89
c8 89 f6 48 89 e5 53 48 8b 8f c8 0c 00 00 4c
8b 04 f1 4d 85 c0 <41> 8b 88 a0 00 00 00 74 60 85 c0 74 5c bf 01 00 00
00 d3 e7 8d
 RIP  [<ffffffffa00fbe07>] bcache_dev_sectors_dirty_add+0x17/0x90 [bcache]
  RSP <ffff880c44545850>
 CR2: 00000000000000a0
 ---[ end trace 052fb8ed913f5457 ]---

Greets,
Stefan