Messages in this thread | | | Date | Thu, 05 Jun 2014 16:00:24 +0800 | From | "Zhang, Yanmin" <> | Subject | Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt_regs |
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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
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