linux-kernel - [lkp] [crypto/xor] 420ce36f05: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020

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Date:	Tue, 23 Feb 2016 08:48:32 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [crypto/xor] 420ce36f05: BUG: unable to handle kernel NULL
 pointer dereference at 0000000000000020

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
commit 420ce36f0515c0fe8b5fda9420bb64cfbea75841 ("crypto/xor: skip speed test if the xor function is selected automatically")


[    4.830567] .................................... done.
[    4.834798] page_owner is disabled
[    4.839879] raid6test: testing the 4-disk case...
[    4.841076] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
[    4.843396] IP: [<ffffffff8139c419>] xor_blocks+0x2e/0x4b
[    4.844877] PGD 0 
[    4.845705] Oops: 0000 [#1] SMP 
[    4.846892] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.5.0-rc5-00005-g420ce36 #1
[    4.848684] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    4.850461] task: ffff880012a38000 ti: ffff880012a40000 task.ti: ffff880012a40000
[    4.852142] RIP: 0010:[<ffffffff8139c419>]  [<ffffffff8139c419>] xor_blocks+0x2e/0x4b
[    4.854341] RSP: 0000:ffff880012a43bc8  EFLAGS: 00010246
[    4.855674] RAX: 0000000000000000 RBX: ffffffff82d943e0 RCX: ffff88000e6f7000
[    4.857367] RDX: ffff88000e6f6000 RSI: ffff88000e710000 RDI: 0000000000001000
[    4.859058] RBP: ffff880012a43bc8 R08: 0000000000000002 R09: ffffffff82d943e0
[    4.860705] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000004
[    4.862376] R13: ffff880012a43cf8 R14: 0000000000000002 R15: 0000000000000002
[    4.864169] FS:  0000000000000000(0000) GS:ffff880013800000(0000) knlGS:0000000000000000
[    4.866144] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.867564] CR2: 0000000000000020 CR3: 0000000001d40000 CR4: 00000000000406b0
[    4.869247] Stack:
[    4.873291]  ffff880012a43c30 ffffffff8139c981 0000000000000000 ffffffff82d943e8
[    4.875322]  0000000000000002 0000000000001000 0000000000000002 ffff88000e710000
[    4.877246]  ffff880013040400 0000000000000004 ffff880012a43cf4 ffff880012a43cf8
[    4.879384] Call Trace:
[    4.880174]  [<ffffffff8139c981>] async_xor+0x1b1/0x1da
[    4.881392]  [<ffffffff8139cf1e>] async_syndrome_val+0x16f/0x357
[    4.882849]  [<ffffffff8139d386>] ? raid6_test_exit+0x6/0x6
[    4.884340]  [<ffffffff8139d652>] raid6_dual_recov+0x269/0x2c8
[    4.885847]  [<ffffffff8139d98d>] test+0x2dc/0x4f1
[    4.886970]  [<ffffffff8139d386>] ? raid6_test_exit+0x6/0x6
[    4.888221]  [<ffffffff8139dc14>] raid6_test+0x72/0x119
[    4.889464]  [<ffffffff8139dba2>] ? test+0x4f1/0x4f1
[    4.890646]  [<ffffffff81fa913b>] do_one_initcall+0x10c/0x1c7
[    4.891943]  [<ffffffff81fa9309>] kernel_init_freeable+0x113/0x199
[    4.893392]  [<ffffffff81830cbf>] ? rest_init+0x136/0x136
[    4.894743]  [<ffffffff81830cc8>] kernel_init+0x9/0xcf
[    4.895938]  [<ffffffff8183761f>] ret_from_fork+0x3f/0x70
[    4.897148]  [<ffffffff81830cbf>] ? rest_init+0x136/0x136
[    4.898402] Code: fa 48 8b 05 72 7d 9f 01 41 83 fa 01 89 f7 48 89 d6 48 89 e5 48 8b 11 75 05 ff 50 18 eb 28 41 83 fa 02 49 89 c9 48 8b 49 08 75 05 <ff> 50 20 eb 16 41 83 fa 03 4d 8b 41 10 75 05 ff 50 28 eb 07 4d 
[    4.911424] RIP  [<ffffffff8139c419>] xor_blocks+0x2e/0x4b
[    4.912791]  RSP <ffff880012a43bc8>
[    4.913792] CR2: 0000000000000020
[    4.914654] ---[ end trace 596e7e91d3b9c992 ]---
[    4.915786] Kernel panic - not syncing: Fatal exception





Thanks,
Kernel Test Robot

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