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Date: Wed, 7 Aug 2013 16:14:55 -0400 (EDT)
From: Vince Weaver <vincent.weaver@maine.edu>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
cc: Mark Rutland <mark.rutland@arm.com>, Will Deacon <will.deacon@arm.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        "trinity@vger.kernel.org" <trinity@vger.kernel.org>
Subject: perf,arm -- another (different) fuzzer oops
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Hello

I don't have time to come up with a test case right now, but I've
applied the patch to fix the oops from two days ago, and re-ran
my perf_fuzzer tool and it immediately came up with another issue on ARM.
This is an ARM Pandaboard running 3.11-rc4 with the one-line
oops fix from the other thread.

Vince

[  388.509063] Unable to handle kernel paging request at virtual address 73fd14cc
[  388.509063] pgd = eca6c000
[  388.519805] [73fd14cc] *pgd=00000000
[  388.523651] Internal error: Oops: 5 [#1] SMP ARM
[  388.528594] Modules linked in: snd_soc_omap_hdmi omapdss snd_soc_omap_abe_twl6040 snd_soc_twl6040 snd_soc_omap snd_soc_omap_hdmi_card snd_soc_omap_mcpdm snd_soc_omap_mcbsp snd_soc_core snd_compress regmap_spi snd_pcm snd_page_alloc snd_timer snd soundcore
[  388.551757] CPU: 1 PID: 2790 Comm: perf_fuzzer Not tainted 3.11.0-rc4 #6
[  388.559906] task: eddcab80 ti: ed892000 task.ti: ed892000
[  388.565643] PC is at armpmu_map_event+0x20/0x88
[  388.570495] LR is at armpmu_event_init+0x38/0x280
[  388.574981] pc : [<c001c3e4>]    lr : [<c001c17c>]    psr: 60000013
[  388.574981] sp : ed893e40  ip : ecececec  fp : edfaec00
[  388.581878] r10: 00000000  r9 : 00000000  r8 : ed8c3ac0
[  388.593292] r7 : ed8c3b5c  r6 : edfaec00  r5 : 00000000  r4 : 00000000
[  388.593292] r3 : 000000ff  r2 : c0496144  r1 : c049611c  r0 : edfaec00
[  388.607177] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[  388.614776] Control: 10c5387d  Table: aca6c04a  DAC: 00000015
[  388.614776] Process perf_fuzzer (pid: 2790, stack limit = 0xed892240)
[  388.621826] Stack: (0xed893e40 to 0xed894000)
[  388.632385] 3e40: 00000800 c001c17c 00000002 c008a748 00000001 00000000 00000000 c00bf078
[  388.634796] 3e60: 00000000 edfaee50 00000000 00000000 00000000 edfaec00 ed8c3ac0 edfaec00
[  388.634796] 3e80: 00000000 c073ffac ed893f20 c00bf180 00000001 00000000 c00bf078 ed893f20
[  388.652435] 3ea0: 00000000 ed8c3ac0 00000000 00000000 00000000 c0cb0818 eddcab80 c00bf440
[  388.667205] 3ec0: ed893f20 00000000 eddcab80 eca76800 00000000 eca76800 00000000 00000000
[  388.668487] 3ee0: 00000000 ec984c80 eddcab80 c00bfe68 00000000 00000000 00000000 00000080
[  388.684631] 3f00: 00000000 ed892000 00000000 ed892030 00000004 ecc7e3c8 ecc7e3c8 00000000
[  388.693328] 3f20: 00000000 00000048 ecececec 00000000 00000000 00000000 00000000 00000000
[  388.701843] 3f40: 00000000 00000000 00297810 00000000 00000000 00000000 00000000 00000000
[  388.701843] 3f60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  388.719451] 3f80: 00000002 00000002 000103a4 00000002 0000016c c00128e8 ed892000 00000000
[  388.724212] 3fa0: 00090998 c0012700 00000002 000103a4 00090ab8 00000000 00000000 0000000f
[  388.731842] 3fc0: 00000002 000103a4 00000002 0000016c 00090ab0 00090ab8 000107a0 00090998
[  388.745574] 3fe0: bed92be0 bed92bd0 0000b785 b6e8f6d0 40000010 00090ab8 00000000 00000000
[  388.751831] [<c001c3e4>] (armpmu_map_event+0x20/0x88) from [<c001c17c>] (armpmu_event_init+0x38/0x280)
[  388.764221] [<c001c17c>] (armpmu_event_init+0x38/0x280) from [<c00bf180>] (perf_init_event+0x108/0x180)
[  388.764221] [<c00bf180>] (perf_init_event+0x108/0x180) from [<c00bf440>] (perf_event_alloc+0x248/0x40c)
[  388.764221] [<c00bf440>] (perf_event_alloc+0x248/0x40c) from [<c00bfe68>] (SyS_perf_event_open+0x4f4/0x8fc)
[  388.791839] [<c00bfe68>] (SyS_perf_event_open+0x4f4/0x8fc) from [<c0012700>] (ret_fast_syscall+0x0/0x48)
[  388.804718] Code: 0a000005 e3540004 0a000016 e3540000 (0791010c) 
[  388.811248] ---[ end trace 89ea407225495d97 ]---
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