linux-kernel - perf,arm -- oops in validate

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Date:	Mon, 5 Aug 2013 16:27:20 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: perf,arm -- oops in validate_event


My perf_fuzzer quickly triggers this oops on my ARM Cortex A9 pandaboard
running Linux 3.11-rc4.

Below is the oops, I've attached a simple C test case that triggers the 
bug.

Vince


[ 8110.698669] Unable to handle kernel paging request at virtual address fffffffe
[ 8110.706390] pgd = ecd88000
[ 8110.708251] [fffffffe] *pgd=ae7f6821, *pte=00000000, *ppte=00000000
[ 8110.715820] Internal error: Oops: 80000007 [#2] SMP ARM
[ 8110.716033] Modules linked in: bluetooth snd_soc_omap_hdmi omapdss snd_soc_omap_abe_twl6040 snd_soc_twl6040 snd_soc_omap_hdmi_card snd_soc_omap snd_soc_omap_mcpdm snd_soc_omap_mcbsp snd_soc_core snd_compress regmap_spi snd_pcm snd_page_alloc snd_timer snd soundcore
[ 8110.743133] CPU: 1 PID: 28431 Comm: perf_fuzzer Tainted: G      D      3.11.0-rc4 #4
[ 8110.743133] task: edab8100 ti: ece5c000 task.ti: ece5c000
[ 8110.760681] PC is at 0xfffffffe
[ 8110.760681] LR is at validate_event+0x3c/0x50
[ 8110.766906] pc : [<fffffffe>]    lr : [<c001bf9c>]    psr: 20000033
[ 8110.766906] sp : ece5de40  ip : edfbd960  fp : edfbd800
[ 8110.775238] r10: 00000000  r9 : 00000000  r8 : ed8c3ec0
[ 8110.781066] r7 : ed8c3f5c  r6 : edfbd800  r5 : ecaed000  r4 : ece5de4c
[ 8110.791107] r3 : ffffffff  r2 : 000000d9  r1 : ecaed000  r0 : ece5de50
[ 8110.791107] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user
[ 8110.803924] Control: 10c5387d  Table: acd8804a  DAC: 00000015
[ 8110.814239] Process perf_fuzzer (pid: 28431, stack limit = 0xece5c240)
[ 8110.821197] Stack: (0xece5de40 to 0xece5e000)
[ 8110.821197] de40: 00000000 c001c280 00000002 00000000 00000001 ece5de4c 00000000 c00bf058
[ 8110.831085] de60: 00000000 c008626c 00000000 00000000 00000000 edfbd800 ed8c3ec0 edfbd800
[ 8110.831085] de80: 00000000 c073ffac ece5df20 c00bf160 00000001 00000000 c00bf058 ece5df20
[ 8110.851959] dea0: 00000000 ed8c3ec0 00000000 00000000 00000000 c0cb0818 edab8100 c00bf420
[ 8110.860656] dec0: ece5df20 00000000 edab8100 ecaed000 00000000 00000000 00000000 00000000
[ 8110.862182] dee0: 00000000 ecad5680 edab8100 c00bfe48 00000000 00000000 00000000 c073e7c0
[ 8110.862182] df00: 00000000 ece5c000 c15036e8 ece5c030 00000005 c06eb5c0 6b139c44 00000000
[ 8110.879913] df20: 00000004 00000050 8dfff7d3 00000000 00000000 00000000 00000000 00000000
[ 8110.895507] df40: 00000000 00000000 001d4a0b 00000000 00000000 00000000 00000000 00000000
[ 8110.901062] df60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 8110.911102] df80: 00000000 00000000 00090990 000103a4 0000016c c00128e8 ece5c000 00000000
[ 8110.921112] dfa0: 000107a0 c0012700 00000000 00090990 00090bd0 00000000 00000000 00000004
[ 8110.921112] dfc0: 00000000 00090990 000103a4 0000016c 00090bd0 00090bc8 00090998 000107a0
[ 8110.931060] dfe0: beab7be0 beab7bd0 0000b6c9 b6f016d0 40000010 00090bd0 00000000 00000000
[ 8110.941009] [<c001bf9c>] (validate_event+0x3c/0x50) from [<c001c280>] (armpmu_event_init+0x16c/0x280)
[ 8110.953247] [<c001c280>] (armpmu_event_init+0x16c/0x280) from [<c00bf160>] (perf_init_event+0x108/0x180)
[ 8110.967712] [<c00bf160>] (perf_init_event+0x108/0x180) from [<c00bf420>] (perf_event_alloc+0x248/0x40c)
[ 8110.971069] [<c00bf420>] (perf_event_alloc+0x248/0x40c) from [<c00bfe48>] (SyS_perf_event_open+0x4f4/0x8fc)
[ 8110.981048] [<c00bfe48>] (SyS_perf_event_open+0x4f4/0x8fc) from [<c0012700>] (ret_fast_syscall+0x0/0x48)
[ 8110.998199] Code: bad PC value
[ 8111.001495] ---[ end trace 0e6c892fae28bee4 ]---
View attachment "arm_perf_oops.c" of type "TEXT/x-csrc" (2128 bytes)