From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>, Liu ShuoX <shuox.liu@intel.com>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>,
Zhang Yanmin <yanmin.zhang@intel.com>
Subject: Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt_regs
Date: Thu, 05 Jun 2014 16:00:24 +0800 [thread overview]
Message-ID: <53902398.70005@linux.intel.com> (raw)
In-Reply-To: <20140605075507.GA6758@twins.programming.kicks-ass.net>
On 2014/6/5 15:55, Peter Zijlstra wrote:
> On Thu, Jun 05, 2014 at 03:33:21PM +0800, Liu ShuoX wrote:
>> On Thu 5.Jun'14 at 9:19:19 +0200, Peter Zijlstra wrote:
>>> On Thu, Jun 05, 2014 at 10:36:10AM +0800, Liu ShuoX wrote:
>>>> From: Zhang Yanmin <yanmin.zhang@intel.com>
>>>>
>>>> We hit a kernel panic when running perf to collect some performance data.
>>>> kenel is x86_64 and user space apps are 32bit.
>>>>
>>>> [ 71.965351, 1] [ Binder_2] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
>>>> [ 71.965360, 1] [ Binder_2] IP: [<ffffffff82012091>] get_segment_base+0x71/0xc0
>>>> [ 71.965367, 1] [ Binder_2] PGD 6c65f067 PUD 0
>>>> [ 71.965375, 1] [ Binder_2] Oops: 0000 [#1] PREEMPT SMP
>>>> [ 71.965413, 1] [ Binder_2] Modules linked in: ddrgx snd_merr_dpcm_wm8958 snd_intel_sst snd_soc_sst_platform snd_soc_wm8994 snd_soc_wm_hubs lm3559 imx1x5 atomisp_css2401a0_v21 libmsrlisthelper rmi4 bcm_bt_lpm videobuf_vmalloc videobuf_core fps_throttle hdmi_audio pn544(O) tngdisp bcm4335(O) cfg80211
>>>> [ 71.965420, 1] [ Binder_2] CPU: 1 PID: 304 Comm: Binder_2 Tainted: G W O 3.10.20-263902-g184bfbc-dirty #14
>>>> [ 71.965426, 1] [ Binder_2] task: ffff8800764dc300 ti: ffff88006c6e8000 task.ti: ffff88006c6e8000
>>>> [ 71.965439, 1] [ Binder_2] RIP: 0010:[<ffffffff82012091>] [<ffffff?f82012091>] get_segment_base+0x71/0xc0
>>> ^
>>>> [ 71.965<44, 1] [ Binder_2] RSP: 0018:ffff^X8007ea87b98 EFLAGS: 00010092
>>> ^ ^
>>>> [ 71.965447, 1] [ !Binder_2] RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
>>> ^
>>>> [ 71.965450, 1] [ Binder_2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000009
>>>> [ 71.965454, 1] [ Binder_2] RBP: ffff88007ea87ba8 R08: ffffffff83143b3c R09: ffffffff831848a8
>>>> [ 71.965458, 1] [ Binder_2] R10: 0000000000000000 R11: 00000000001bf2d8 R12: 0000000000000000
>>>> [ 71.965462, 1] [ Binder_2] R13: ffff88006c6e9fd8 R14: ffff88006c6e9f58 R15: ffff8800764dc300
>>>> [ 71.965468, 1_ [ Binder_2] FS: 0000000000000000(0000) GS:ffff88007ea80000(006b) knlGS:00000000f704add0
>>> ^
>>>
>>> Are you suffering some serious corruption?
>> The log captured by pstore after rebooting, so there are some
>> corruption. Please ignore those.
> Why does pstore cause corruption? I thought that stuff was supposed to
> be 'good' ?
pstore is good if the board is reset by WarmReset as memory content is
kept across rebooting.
If it's a ColdReset, memory might lose some or all contents. My board
uses Coldreset, which is a very
fast ColdReset. Most memory content can be kept. But sometimes, some
data has little change.
Yanmin
next prev parent reply other threads:[~2014-06-05 8:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-05 2:36 [PATCH] perf: fix kernel panic when parsing user space CS saved in pt_regs Liu ShuoX
2014-06-05 7:19 ` Peter Zijlstra
2014-06-05 7:33 ` Liu ShuoX
2014-06-05 7:40 ` [PATCH v2] " Liu ShuoX
2014-06-06 1:55 ` [PATCH v3] " Liu ShuoX
2014-06-05 7:55 ` [PATCH] " Peter Zijlstra
2014-06-05 8:00 ` Zhang, Yanmin [this message]
2014-06-05 9:15 ` Peter Zijlstra
2014-06-05 13:15 ` Zhang, Yanmin
2014-06-05 13:21 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53902398.70005@linux.intel.com \
--to=yanmin_zhang@linux.intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=shuox.liu@intel.com \
--cc=yanmin.zhang@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox