[lkp] [Btrfs] 02507c91c8: BUG: unable to handle kernel NULL pointer dereference at 00000018

[lkp] [Btrfs] 02507c91c8: BUG: unable to handle kernel NULL pointer dereference at 00000018

[kernel test robot]

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FYI, we noticed the below changes on

https://github.com/0day-ci/linux Mark-Fasheh/btrfs-update-qgroups-in-drop-snapshot-V2/20151106-064051
commit 02507c91c8944d71dae65bddc45b764be65069f8 ("Btrfs: use btrfs_get_fs_root in resolve_indirect_ref")


[    3.493866] BTRFS: selftest: Running outstanding_extents tests
[    3.495136] BTRFS: selftest: Running qgroup tests
[    3.500296] BTRFS: selftest: Qgroup basic add
[    3.501401] BUG: unable to handle kernel NULL pointer dereference at 00000018
[    3.503142] IP: [<c1245b49>] btrfs_root_node+0x19/0x70
[    3.504285] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 
[    3.504285] Oops: 0000 [#1] SMP 
[    3.504285] Modules linked in:
[    3.504285] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-rc5-00049-g02507c9 #115
[    3.504285] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    3.504285] task: d2c40000 ti: d2c48000 task.ti: d2c48000
[    3.504285] EIP: 0060:[<c1245b49>] EFLAGS: 00010282 CPU: 0
[    3.504285] EIP is at btrfs_root_node+0x19/0x70
[    3.504285] EAX: d2c10400 EBX: d2c10400 ECX: 00000000 EDX: 00000000
[    3.504285] ESI: d2b400c0 EDI: d2a49000 EBP: d2c49ca8 ESP: d2c49c9c
[    3.504285]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[    3.504285] CR0: 8005003b CR2: 00000018 CR3: 017e0000 CR4: 000006b0
[    3.504285] Stack:
[    3.504285]  d2c10400 d2b400c0 d2a49000 d2c49cc0 c1246a55 00000000 00000000 00000002
[    3.504285]  d2b400c0 d2c49d60 c12d03c0 00000001 ffffffff 00000000 00000000 00b400c0
[    3.504285]  00000010 d2c1c000 d2c1c000 ffffffff ffffffff 00000000 00000000 00000000
[    3.504285] Call Trace:
[    3.504285]  [<c1246a55>] btrfs_old_root_level+0x15/0x80
[    3.504285]  [<c12d03c0>] __resolve_indirect_refs+0x3c0/0x750
[    3.504285]  [<c12d16d0>] find_parent_nodes+0x360/0x6f0
[    3.504285]  [<c12d1afd>] __btrfs_find_all_roots+0x9d/0x100
[    3.504285]  [<c12d1ba1>] btrfs_find_all_roots+0x21/0x70
[    3.504285]  [<c12eb033>] test_no_shared_qgroup+0xd3/0x2f0
[    3.504285]  [<c1769eda>] ? init_befs_fs+0x7c/0x7c
[    3.504285]  [<c12eb3a1>] btrfs_test_qgroups+0x151/0x1c0
[    3.504285]  [<c1769fde>] init_btrfs_fs+0x104/0x169
[    3.504285]  [<c1000416>] do_one_initcall+0x76/0x170
[    3.504285]  [<c174e4d2>] ? repair_env_string+0x12/0x54
[    3.504285]  [<c105c30d>] ? parse_args+0x24d/0x3e0
[    3.504285]  [<c174eb75>] ? kernel_init_freeable+0xcd/0x16f
[    3.504285]  [<c174eb95>] kernel_init_freeable+0xed/0x16f
[    3.504285]  [<c153cfa8>] kernel_init+0x8/0xc0
[    3.504285]  [<c1547181>] ret_from_kernel_thread+0x21/0x30
[    3.504285]  [<c153cfa0>] ? rest_init+0x80/0x80
[    3.504285] Code: ff a1 2c b9 81 c1 89 da e8 f5 b5 ea ff 5b 5d f3 c3 90 55 89 e5 57 56 53 89 c3 90 8d b4 26 00 00 00 00 64 ff 05 00 f7 7c c1 8b 13 <8b> 4a 18 85 c9 74 40 8d 71 01 8d 7a 18 89 c8 f0 0f b1 72 18 39
[    3.504285] EIP: [<c1245b49>] btrfs_root_node+0x19/0x70 SS:ESP 0068:d2c49c9c
[    3.504285] CR2: 0000000000000018
[    3.504285] ---[ end trace 9f3e572417cf4b6e ]---
[    3.504285] Kernel panic - not syncing: Fatal exception





Thanks,
Ying Huang

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Re: [lkp] [Btrfs] 02507c91c8: BUG: unable to handle kernel NULL pointer dereference at 00000018

[Mark Fasheh]

Hi,

On Tue, Nov 10, 2015 at 10:09:30AM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://github.com/0day-ci/linux Mark-Fasheh/btrfs-update-qgroups-in-drop-snapshot-V2/20151106-064051
> commit 02507c91c8944d71dae65bddc45b764be65069f8 ("Btrfs: use btrfs_get_fs_root in resolve_indirect_ref")

I browsed the repo above and didn't see this commit:

d9ee522 Btrfs: fix qgroup sanity tests

Which I believe would help your situation. Please let me know if I am
mistaken.

Thanks,
	--Mark

--
Mark Fasheh