linux-kernel - [sched] 6acbfb96976: kernel BUG at kernel/smpboot.c

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Message-ID: <20150207025156.GB27323@wfg-t540p.sh.intel.com>
Date:	Fri, 6 Feb 2015 18:51:56 -0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [sched] 6acbfb96976: kernel BUG at kernel/smpboot.c

Hi Jiangshan,

We noticed the below BUG in commit

6acbfb96976fc3350e30d964acb1dbbdf876d55e ("sched: Fix hotplug vs.  set_cpus_allowed_ptr()")

testbox/testcase/testparams: brickland1/will-it-scale/powersave-page_fault3
brickland1 is an Ivy Bridge-EX with 128G memory.

4dac0b638310d2e9  6acbfb96976fc3350e30d964ac  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
           :60          33%          20:60    dmesg.kernel_BUG_at_kernel/smpboot.c
           :60          33%          20:60    dmesg.invalid_opcode
           :60          33%          20:60    dmesg.RIP:smpboot_thread_fn
           :60          33%          20:60    dmesg.Kernel_panic-not_syncing:Fatal_exception

testbox/testcase/testparams: brickland1/will-it-scale/powersave-open2

4dac0b638310d2e9  6acbfb96976fc3350e30d964ac  
----------------  --------------------------  
           :95          26%          50:190   dmesg.kernel_BUG_at_kernel/smpboot.c
           :95          26%          50:190   dmesg.invalid_opcode
           :95          26%          50:190   dmesg.RIP:smpboot_thread_fn
           :95          26%          50:190   dmesg.Kernel_panic-not_syncing:Fatal_exception

[    1.819597] TSC synchronization [CPU#0 -> CPU#15]:
[    1.825786] Measured 23680 cycles TSC warp between CPUs, turning off TSC clock.
[    1.834814] tsc: Marking TSC unstable due to check_tsc_sync_source failed
[    0.001000]   #16
[    0.001000] masked ExtINT on CPU#16
[    0.558391]   #17
[    0.558135] masked ExtINT on CPU#17
[    0.580199] ------------[ cut here ]------------
[    0.581000] kernel BUG at kernel/smpboot.c:134!
[    0.581000] invalid opcode: 0000 [#1] SMP 
[    0.581000] Modules linked in:
[    0.581000] CPU: 0 PID: 128 Comm: watchdog/17 Not tainted 3.19.0-rc5-gb711c1d #1
[    0.581000] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BKLDSDP1.86B.0031.R01.1304221600 04/22/2013
[    0.581000] task: ffff88105c150000 ti: ffff88105c14c000 task.ti: ffff88105c14c000
[    0.581000] RIP: 0010:[<ffffffff81096198>]  [<ffffffff81096198>] smpboot_thread_fn+0x1e8/0x280
[    0.581000] RSP: 0000:ffff88105c14fe68  EFLAGS: 00010206
[    0.581000] RAX: 0000000000000000 RBX: ffff88105c150000 RCX: 0000000000000000
[    0.581000] RDX: ffff88105c14ffd8 RSI: ffff88105c150000 RDI: 0000000000000011
[    0.581000] RBP: ffff88105c14feb8 R08: ffff88105c14c000 R09: 0000000000000001
[    0.581000] R10: 00000000016e3600 R11: 0000000000800711 R12: ffff88105c5bc060
[    0.581000] R13: ffffffff81d35040 R14: ffff88105c150000 R15: ffff88105c150000
[    0.581000] FS:  0000000000000000(0000) GS:ffff88085f800000(0000) knlGS:0000000000000000
[    0.581000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.581000] CR2: ffff88207ffff000 CR3: 0000000001ca5000 CR4: 00000000001407f0
[    0.581000] Stack:
[    0.581000]  ffff88105c14fee8 ffff88105c150000 ffff88105c14fe88 0000000000000000
[    0.581000]  ffff88105c14feb8 ffff88105c5bd6c0 ffff88105c5bc060 ffffffff81095fb0
[    0.581000]  0000000000000000 0000000000000000 ffff88105c14ff48 ffffffff81091f8f
[    0.581000] Call Trace:
[    0.581000]  [<ffffffff81095fb0>] ? SyS_setgroups+0x170/0x170
[    0.581000]  [<ffffffff81091f8f>] kthread+0xef/0x110
[    0.581000]  [<ffffffff81091ea0>] ? kthread_create_on_node+0x180/0x180
[    0.581000]  [<ffffffff818ad53c>] ret_from_fork+0x7c/0xb0
[    0.581000]  [<ffffffff81091ea0>] ? kthread_create_on_node+0x180/0x180
[    0.581000] Code: ff ff 90 41 8b 3c 24 65 8b 15 ad 3f f7 7e 39 d7 0f 85 a5 00 00 00 ff d0 41 c7 44 24 04 02 00 00 00 e9 e4 fe ff ff 0f 1f 44 00 00 <0f> 0b 66 0f 1f 44 00 00 65 ff 0d 39 57 f7 7e e8 94 1d 81 00 e9 
[    0.581000] RIP  [<ffffffff81096198>] smpboot_thread_fn+0x1e8/0x280
[    0.581000]  RSP <ffff88105c14fe68>
[    0.581011] ---[ end trace 261458802e83dcc4 ]---
[    0.582003] Kernel panic - not syncing: Fatal exception
[    0.583000] Shutting down cpus with NMI

Thanks,
Fengguang

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