linux-kernel - [sched/balance] BUG: unable to handle kernel NULL pointer dereference at 000000000000015d

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Date:	Wed, 19 Mar 2014 19:56:54 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Alex Shi <alex.shi@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [sched/balance] BUG: unable to handle kernel NULL pointer
 dereference at 000000000000015d

Alex,

FYI, we noticed the below BUG on

https://github.com/alexshi/power-scheduling.git single-balance
commit ac76eed9c784ed577d0f26cc0bfd3bba02465942 ("sched/balance: send resched to load pulled cpu")

[   55.934564] BUG: unable to handle kernel NULL pointer dereference at 000000000000015d
[   55.937722] IP: [<ffffffff81a44659>] __schedule+0x585/0x787                          
[   55.937722] PGD 103f54f067 PUD 103f528067 PMD 0            
[   55.937722] Oops: 0000 [#1] SMP
[   55.937722] Modules linked in: x86_pkg_temp_thermal microcode mpt2sas ipmi_si ipmi_msghandler processor
[   55.937722] CPU: 91 PID: 375 Comm: migration/91 Not tainted 3.14.0-rc6-00004-g018e9d5 #1               
[   55.937722] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BKLDSDP1.86B.0031.R01.1304221600 04/22/2013
[   55.937722] task: ffff8818545ad190 ti: ffff881854604000 task.ti: ffff881854604000                                 
[   55.937722] RIP: 0010:[<ffffffff81a44659>]  [<ffffffff81a44659>] __schedule+0x585/0x787
[   55.937722] RSP: 0018:ffff881854605d78  EFLAGS: 00010246                               
[   55.937722] RAX: 000000000000005b RBX: ffff88185fa13000 RCX: 0000005b00000000
[   55.937722] RDX: ffff8818545ad640 RSI: ffff8818545ad190 RDI: ffff88185fa13000
[   55.937722] RBP: 000000000000024d R08: ffff881854604000 R09: 0000000000000073
[   55.937722] R10: 0000000000005c00 R11: 0000000000005b8d R12: ffff88103eb192c0
[   55.937722] R13: 0000000000000000 R14: 000000000000005b R15: ffff8818545ad190
[   55.937722] FS:  0000000000000000(0000) GS:ffff88185fa00000(0000) knlGS:0000000000000000
[   55.937722] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033                           
[   55.937722] CR2: 000000000000015d CR3: 000000103f550000 CR4: 00000000001407e0
[   55.937722] Stack:
[   55.937722]  ffff8818546061f9 0000000000000000 0000000000000000 000000000000001e
[   55.937722]  0000000000000000 ffffffffffffffe4 0000000000000000 000000000000024d
[   55.937722]  0000000000000000 ffff881854605e09 0000000000000000 0000000000000000
[   55.937722] Call Trace:
[   55.937722] Code: 58 08 00 00 48 8b 40 60 48 8b 50 58 48 85 d2 74 05 48 89 df ff d2 4c 89 e6 48 89 df e8 c3 2e 00 00 c7 83 b4 08 00 00
00 00 00 00 <48> 8b 85 10 ff ff ff 65 ff 0c 25 50 b9 00 00 48 8b 80 38 e0 ff
[   55.937722] RIP  [<ffffffff81a44659>] __schedule+0x585/0x787             
[   55.937722]  RSP <ffff881854605d78>
[   55.937722] CR2: 000000000000015d
[   55.937722] ---[ end trace 905b5ff6abaedc72 ]---
[   55.937722] Kernel panic - not syncing: Fatal exception
[   55.937722] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
[   55.937722] Rebooting in 10 seconds..

Thanks,
Fengguang

View attachment ".dmesg" of type "text/plain" (227779 bytes)