From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [CPU hotplug, cpuidle_disable_device] BUG: unable to handle kernel NULL pointer dereference at (null)
Date: Tue, 23 Oct 2012 15:09:46 +0200 [thread overview]
Message-ID: <5086971A.1070009@linaro.org> (raw)
In-Reply-To: <20121023124856.GA17692@localhost>
On 10/23/2012 02:48 PM, Fengguang Wu wrote:
Hi Fengguang,
I believe this bug has been fixed by https://lkml.org/lkml/2012/10/8/87
Thanks for reporting the problem.
-- Daniel
> Hi Daniel,
>
> When doing CPU hotplug tests, I got the following bug
>
> [ 25.979429] KVM setup async PF for cpu 1
> [ 25.980593] kvm-stealtime: cpu 1, msr 1f40d140
> [ 25.982728] BUG: unable to handle kernel NULL pointer dereference at (null)
> [ 25.982741] IP: [<ffffffff81678fad>] cpuidle_disable_device+0xc/0x5c
> [ 25.982744] PGD 1adb6067 PUD 18d97067 PMD 0
> [ 25.982747] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
> [ 25.982749] Modules linked in:
> [ 25.982753] CPU 0
> [ 25.982753] Pid: 2273, comm: 01-cpu-hotplug Not tainted 3.6.0-00324-g8937cc5 #1290 Bochs Bochs
> [ 25.982756] RIP: 0010:[<ffffffff81678fad>] [<ffffffff81678fad>] cpuidle_disable_device+0xc/0x5c
> [ 25.982760] RSP: 0018:ffff880018c75cd8 EFLAGS: 00010246
> [ 25.982761] RAX: ffff880018c75fd8 RBX: ffff88001b49c000 RCX: ffff880018c3aaf0
> [ 25.982762] RDX: 0000000000000006 RSI: ffff880018c3aaf0 RDI: 0000000000000000
> [ 25.982764] RBP: ffff880018c75ce8 R08: ffff880018c75c88 R09: 000000000000000a
> [ 25.982765] R10: ffff88001f20a000 R11: ffff880018c3aaf0 R12: 0000000000000000
> [ 25.982766] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff81ce2a70
> [ 25.982767] FS: 00007f286a3fc700(0000) GS:ffff88001f200000(0000) knlGS:0000000000000000
> [ 25.982769] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 25.982770] CR2: 0000000000000000 CR3: 0000000018c7c000 CR4: 00000000000006f0
> [ 25.982774] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 25.982778] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 25.982779] Process 01-cpu-hotplug (pid: 2273, threadinfo ffff880018c74000, task ffff880018c3a350)
> [ 25.982780] Stack:
> [ 25.982782] ffff88001b49c000 0000000000000000 ffff880018c75d18 ffffffff8137732f
> [ 25.982785] ffff88001b49c000 ffff88001b49c000 0000000000000002 ffffffff81c81c01
> [ 25.982787] ffff880018c75d48 ffffffff81374dd7 0000000000000001 0000000000000001
> [ 25.982788] Call Trace:
> [ 25.982799] [<ffffffff8137732f>] acpi_processor_hotplug+0x55/0x97
> [ 25.982801] [<ffffffff81374dd7>] acpi_cpu_soft_notify+0x92/0xcd
> [ 25.982804] [<ffffffff817e1c2b>] notifier_call_chain+0x65/0x95
> [ 25.982812] [<ffffffff8105c9ae>] __raw_notifier_call_chain+0xe/0x10
> [ 25.982816] [<ffffffff810384ec>] __cpu_notify+0x20/0x37
> [ 25.982819] [<ffffffff81038516>] cpu_notify+0x13/0x15
> [ 25.982834] [<ffffffff817c57fb>] _cpu_up+0x16c/0x1ae
> [ 25.982837] [<ffffffff817c58ac>] cpu_up+0x6f/0x81
> [ 25.982839] [<ffffffff8178cffd>] store_online+0x5f/0x8f
> [ 25.982847] [<ffffffff813cb558>] dev_attr_store+0x18/0x24
> [ 25.982857] [<ffffffff81176ab0>] sysfs_write_file+0xee/0x126
> [ 25.982865] [<ffffffff81119129>] vfs_write+0xa6/0x132
> [ 25.982868] [<ffffffff811193b0>] sys_write+0x4c/0x80
> [ 25.982871] [<ffffffff817e581e>] tracesys+0xd0/0xd5
> [ 25.982898] Code: d8 48 01 d6 48 81 fe ff ff ff 7f 48 0f 4e ce 41 89 4c 24 08 48 83 c4 28 5b 41 5c 41 5d 5d c3 0f 1f 44 00 00 55 48 89 e5 41 54 53 <f6> 07 02 48 89 fb 74 43 e8 e2 05 00 00 48 85 c0 74 39 48 83 3d
> [ 25.982900] RIP [<ffffffff81678fad>] cpuidle_disable_device+0xc/0x5c
> [ 25.982901] RSP <ffff880018c75cd8>
> [ 25.982902] CR2: 0000000000000000
>
> which is bisected to:
>
> 3d339dcbb56d8d70c1b959aff87d74adc3a84eea is the first bad commit
> commit 3d339dcbb56d8d70c1b959aff87d74adc3a84eea
> Author: Daniel Lezcano <daniel.lezcano@linaro.org>
> Date: Mon Sep 17 23:01:56 2012 +0200
>
> cpuidle / ACPI : move cpuidle_device field out of the acpi_processor_power structure
>
> Thanks,
> Fengguang
--
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next prev parent reply other threads:[~2012-10-23 13:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-23 12:48 [CPU hotplug, cpuidle_disable_device] BUG: unable to handle kernel NULL pointer dereference at (null) Fengguang Wu
2012-10-23 13:09 ` Daniel Lezcano [this message]
2012-10-23 13:13 ` Fengguang Wu
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