linux-kernel - Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt

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Date:	Thu, 5 Jun 2014 09:55:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Liu ShuoX <shuox.liu@...el.com>
Cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Zhang Yanmin <yanmin.zhang@...el.com>,
	yanmin_zhang@...ux.intel.com
Subject: Re: [PATCH] perf: fix kernel panic when parsing user space CS saved
 in pt_regs

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@...el.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' ?

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