Re: kernel BUG at kernel/smpboot.c:134!
From: Srivatsa S. Bhat
Date: Sat Apr 06 2013 - 03:15:38 EST
Hi Dave,
On 04/06/2013 03:13 AM, Dave Hansen wrote:
> Hey Thomas,
>
> I seem to be running in to smpboot_thread_fn()'s
>
> BUG_ON(td->cpu != smp_processor_id());
>
> pretty regularly, both at boot and if I boot with maxcpus=x and then
> online the CPUs from sysfs after boot. It's a 160-logical-cpu system,
> so it's quite a beast. I _seem_ to be hitting it more often at higher
> cpu counts, but it doesn't trigger on bringing up a particular CPU as
> far as I can tell.
>
> This is on a pull of mainline from today, e0a77f263. Any ideas?
>
Dave Jones had reported a similar problem some time back and Hillf had
proposed a fix. I guess it slipped through the cracks and never went
upstream.
Here is the link: https://lkml.org/lkml/2013/1/19/1
Can you please try it and see if it improves anything?
Regards,
Srivatsa S. Bhat
>> [ 790.223270] ------------[ cut here ]------------
>> [ 790.223966] kernel BUG at kernel/smpboot.c:134!
>> [ 790.224739] invalid opcode: 0000 [#1] SMP
>> [ 790.225671] Modules linked in:
>> [ 790.226428] CPU 81
>> [ 790.226909] Pid: 3909, comm: migration/135 Tainted: G W 3.9.0-rc5-00184-gb6a9b7f-dirty #118 FUJITSU-SV PRIMEQUEST 1800E2/SB
>> [ 790.228775] RIP: 0010:[<ffffffff8110bee8>] [<ffffffff8110bee8>] smpboot_thread_fn+0x258/0x280
>> [ 790.230205] RSP: 0018:ffff88bfef9c1e08 EFLAGS: 00010202
>> [ 790.231090] RAX: 0000000000000051 RBX: ffff88bfefb82000 RCX: 000000000000b888
>> [ 790.231653] RDX: ffff88bfef9c1fd8 RSI: ffff881fff000000 RDI: 0000000000000087
>> [ 790.232085] RBP: ffff88bfef9c1e38 R08: 0000000000000001 R09: 0000000000000000
>> [ 790.232850] R10: 0000000000000018 R11: 0000000000000000 R12: ffff88bfec9e22e0
>> [ 790.233561] R13: ffffffff81e587a0 R14: ffff88bfec9e22e0 R15: 0000000000000000
>> [ 790.234004] FS: 0000000000000000(0000) GS:ffff881fff000000(0000) knlGS:0000000000000000
>> [ 790.234918] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> [ 790.235602] CR2: 00007fa89a333c62 CR3: 0000000001e0b000 CR4: 00000000000007e0
>> [ 790.236110] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [ 790.236584] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> [ 790.237329] Process migration/135 (pid: 3909, threadinfo ffff88bfef9c0000, task ffff88bfec9e22e0)
>> [ 790.238321] Stack:
>> [ 790.238882] ffff88bfef9c1e38 0000000000000000 ffff88ffef421cc0 ffff88bfef9c1ec0
>> [ 790.245415] ffff88bfefb82000 ffffffff8110bc90 ffff88bfef9c1f48 ffffffff810ff1df
>> [ 790.250755] 0000000000000001 0000000000000087 ffff88bfefb82000 0000000000000000
>> [ 790.253365] Call Trace:
>> [ 790.254121] [<ffffffff8110bc90>] ? __smpboot_create_thread+0x180/0x180
>> [ 790.255428] [<ffffffff810ff1df>] kthread+0xef/0x100
>> [ 790.256071] [<ffffffff819cb1a4>] ? wait_for_completion+0x124/0x180
>> [ 790.256697] [<ffffffff810ff0f0>] ? __init_kthread_worker+0x80/0x80
>> [ 790.257325] [<ffffffff819dba9c>] ret_from_fork+0x7c/0xb0
>> [ 790.258233] [<ffffffff810ff0f0>] ? __init_kthread_worker+0x80/0x80
>> [ 790.258942] Code: ef 3d 01 01 48 89 df e8 87 b0 16 00 48 83 05 67 ef 3d 01 01 48 83 c4 10 31 c0 5b 41 5c 41 5d 41 5e 5d c3 48 83 05 90 ef 3d 01 01 <0f> 0b 48 83 05 96 ef 3d 01 01 48 83 05 56 ef 3d 01 01 0f 0b 48
>> [ 790.276178] RIP [<ffffffff8110bee8>] smpboot_thread_fn+0x258/0x280
>> [ 790.276735] RSP <ffff88bfef9c1e08>
>> [ 790.278348] ---[ end trace 84baa2bee1434240 ]---
>
>
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