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.zh...@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
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