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From: Vince Weaver <vincent.weaver@maine.edu>
X-Google-Original-From: Vince Weaver <vince@maine.edu>
Date: Tue, 15 Nov 2016 12:43:56 -0500 (EST)
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To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        "davej@codemonkey.org.uk" <davej@codemonkey.org.uk>,
        "dvyukov@google.com" <dvyukov@google.com>,
        Stephane Eranian <eranian@gmail.com>
Subject: perf: fuzzer KASAN unwind_get_return_address
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Running on my haswell machine with the imc/uncore patch applied, the 
perf_fuzzer next tripped over this issue.

[  202.034495] BAD LUCK: lost 371 message(s) from NMI context!
[  202.034496] ==================================================================
[  202.048327] BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x35/0x80 at addr ffff8800cff0bd90
[  202.058826] Read of size 8 by task perf_fuzzer/16254
[  202.064186] page:ffffea00033fc2c0 count:1 mapcount:0 mapping:          (null) index:0x0^Ac
[  202.073068] flags: 0x1ffff8000000400(reserved)
[  202.077885] page dumped because: kasan: bad access detected
[  202.083880] CPU: 4 PID: 16254 Comm: perf_fuzzer Not tainted 4.9.0-rc5+ #5
[  202.091204] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[  202.099181]  ffff8800cff0b1d8^Ac ffffffff816bb796^Ac ffff8800cff0b270^Ac ffff8800cff0bd90^Ac
[  202.107896]  ffff8800cff0b260^Ac ffffffff812fbe95^Ac 00007ffc9d1ab480^Ac 0000000000000000^Ac
[  202.116638]  ffffffff8125117d^Ac 0000000000000092^Ac 0000000000000000^Ac ffff8800cff0b7c0^Ac
[  202.125339] Call Trace:
[  202.127994]  <NMI>  [<ffffffff816bb796>] dump_stack+0x63/0x8d
[  202.134184]  [<ffffffff812fbe95>] kasan_report_error+0x495/0x4c0
[  202.140680]  [<ffffffff8125117d>] ? perf_output_begin+0x28d/0x4c0
[  202.147228]  [<ffffffff812fc319>] kasan_report+0x39/0x40
[  202.152987]  [<ffffffff81095ce5>] ? unwind_get_return_address+0x35/0x80
[  202.160094]  [<ffffffff812fa8fe>] __asan_load8+0x5e/0x70
[  202.165859]  [<ffffffff81095ce5>] unwind_get_return_address+0x35/0x80
[  202.172817]  [<ffffffff8100b08d>] perf_callchain_kernel+0x22d/0x270
[  202.179590]  [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80
[  202.185548]  [<ffffffff8100ae60>] ? arch_perf_update_userpage+0x130/0x130
[  202.192849]  [<ffffffff81252aaa>] get_perf_callchain+0x24a/0x3e0
[  202.199339]  [<ffffffff81252860>] ? put_callchain_buffers+0x50/0x50
[  202.206092]  [<ffffffff81095b17>] ? perf_get_regs_user+0x327/0x380
[  202.212751]  [<ffffffff81135fd0>] ? lock_release+0x30/0x540
[  202.218803]  [<ffffffff81252d05>] perf_callchain+0xc5/0xe0
[  202.224767]  [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80
[  202.230696]  [<ffffffff8124dbf9>] perf_prepare_sample+0x489/0x630
[  202.237275]  [<ffffffff81135fd0>] ? lock_release+0x30/0x540
[  202.243266]  [<ffffffff8124de9c>] ? perf_event_output_forward+0xfc/0x130
[  202.250472]  [<ffffffff8124dda0>] ? perf_prepare_sample+0x630/0x630
[  202.257251]  [<ffffffff8124e0ae>] perf_event_output+0xae/0x130
[  202.263564]  [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130
[  202.270964]  [<ffffffff8124e000>] ? perf_event_output_backward+0x130/0x130
[  202.278373]  [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0
[  202.285772]  [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0
[  202.292744]  [<ffffffff812fac4f>] ? __asan_loadN+0xf/0x20
[  202.298581]  [<ffffffff8101757d>] ? setup_pebs_sample_data+0x68d/0x830
[  202.305622]  [<ffffffff81017a91>] __intel_pmu_pebs_event+0x221/0x3a0
[  202.312469]  [<ffffffff81135e4d>] ? lock_acquire+0x3d/0x190
[  202.318523]  [<ffffffff81017870>] ? pebs_update_state+0x150/0x150
[  202.325060]  [<ffffffff8104c6ec>] ? get_stack_info+0x3c/0x150
[  202.331259]  [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0
[  202.338128]  [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80
[  202.344059]  [<ffffffff81018b50>] ? intel_pmu_disable_bts+0x60/0x60
[  202.350823]  [<ffffffff812fa7c4>] ? __asan_load4+0x24/0x80
[  202.356740]  [<ffffffff81252d05>] ? perf_callchain+0xc5/0xe0
[  202.362855]  [<ffffffff81135fd0>] ? lock_release+0x30/0x540
[  202.368855]  [<ffffffff8124dc31>] ? perf_prepare_sample+0x4c1/0x630
[  202.375619]  [<ffffffff8124de84>] ? perf_event_output_forward+0xe4/0x130
[  202.382849]  [<ffffffff81017ffc>] intel_pmu_drain_pebs_nhm+0x3ec/0x530
[  202.389899]  [<ffffffff81017c10>] ? __intel_pmu_pebs_event+0x3a0/0x3a0
[  202.396959]  [<ffffffff81247caa>] ? perf_event_update_userpage+0x1fa/0x2b0
[  202.406800]  [<ffffffff81247cc2>] ? perf_event_update_userpage+0x212/0x2b0
[  202.416486]  [<ffffffff81247ab0>] ? perf_event_task_disable+0xc0/0xc0
[  202.425720]  [<ffffffff8101a832>] ? intel_pmu_lbr_read+0x32/0x790
[  202.434566]  [<ffffffff8123ba26>] ? __perf_event_overflow+0x116/0x280
[  202.443735]  [<ffffffff810144d8>] ? intel_bts_interrupt+0x88/0x1b0
[  202.452538]  [<ffffffff81012c7e>] intel_pmu_handle_irq+0x3ae/0x690
[  202.461407]  [<ffffffff810128d0>] ? intel_pmu_save_and_restart+0x80/0x80
[  202.470877]  [<ffffffff81135fd0>] ? lock_release+0x30/0x540
[  202.479131]  [<ffffffff81088eeb>] ? native_apic_msr_write+0x2b/0x30
[  202.488181]  [<ffffffff8108899c>] ? x2apic_send_IPI_self+0x3c/0x50
[  202.497066]  [<ffffffff81055d72>] ? native_sched_clock+0x62/0x140
[  202.505919]  [<ffffffff810081fd>] perf_event_nmi_handler+0x2d/0x50
[  202.514832]  [<ffffffff8104da91>] nmi_handle+0xb1/0x1d0
[  202.522697]  [<ffffffff8104d9e5>] ? nmi_handle+0x5/0x1d0
[  202.530610]  [<ffffffff8104e185>] default_do_nmi+0xe5/0x140
[  202.538765]  [<ffffffff8104e332>] do_nmi+0x152/0x1b0
[  202.546254]  [<ffffffff81b8f171>] end_repeat_nmi+0x1a/0x1e
[  202.554257]  [<ffffffff810106b7>] ? __intel_pmu_enable_all+0x77/0xf0
[  202.563167]  [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0
[  202.572060]  [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0
[  202.580864]  [<ffffffff812475eb>] ? perf_event_task_tick+0x48b/0x5f0
[  202.589703]  <EOE>  <IRQ>  [<ffffffff81101571>] scheduler_tick+0xb1/0x150
[  202.598985]  [<ffffffff8116e7e7>] update_process_times+0x47/0x60
[  202.607433]  [<ffffffff81185e53>] tick_sched_handle.isra.14+0x33/0x80
[  202.616314]  [<ffffffff811869cb>] tick_sched_timer+0x4b/0x90
[  202.624322]  [<ffffffff8116fbfe>] __hrtimer_run_queues+0x21e/0x540
[  202.632864]  [<ffffffff81186980>] ? tick_sched_do_timer+0x50/0x50
[  202.641337]  [<ffffffff8116f9e0>] ? retrigger_next_event+0xa0/0xa0
[  202.649947]  [<ffffffff8117b8f6>] ? ktime_get_update_offsets_now+0xe6/0x190
[  202.659411]  [<ffffffff811707f0>] ? hrtimer_interrupt+0xb0/0x220
[  202.667864]  [<ffffffff8117082f>] hrtimer_interrupt+0xef/0x220
[  202.676069]  [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0
[  202.684444]  [<ffffffff8107ec2f>] local_apic_timer_interrupt+0x4f/0x80
[  202.693422]  [<ffffffff81b903d7>] smp_apic_timer_interrupt+0x57/0x70
[  202.702203]  [<ffffffff81b8f6a2>] apic_timer_interrupt+0x82/0x90
[  202.710591]  <EOI>  [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0
[  202.719609]  [<ffffffff8118dc3a>] ? smp_call_function_single+0x14a/0x1b0
[  202.728811]  [<ffffffff8118dc30>] ? smp_call_function_single+0x140/0x1b0
[  202.738039]  [<ffffffff8118daf0>] ? generic_exec_single+0x170/0x170
[  202.746727]  [<ffffffff8123b020>] ? perf_cgroup_attach+0xb0/0xb0
[  202.755181]  [<ffffffff81238e48>] event_function_call+0x268/0x270
[  202.763687]  [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60
[  202.772057]  [<ffffffff81238be0>] ? task_function_call+0xc0/0xc0
[  202.780404]  [<ffffffff812426d0>] ? task_ctx_sched_out+0x60/0x60
[  202.788768]  [<ffffffff81238e79>] ? _perf_event_disable+0x29/0x70
[  202.797258]  [<ffffffff812383d0>] ? update_group_times+0x50/0x50
[  202.805667]  [<ffffffff81238e97>] ? _perf_event_disable+0x47/0x70
[  202.814188]  [<ffffffff8113a4d7>] ? do_raw_spin_unlock+0x97/0x130
[  202.822733]  [<ffffffff81238e50>] ? event_function_call+0x270/0x270
[  202.831462]  [<ffffffff81238ea8>] _perf_event_disable+0x58/0x70
[  202.839778]  [<ffffffff812386a3>] perf_event_for_each_child+0x53/0xd0
[  202.848576]  [<ffffffff81247a51>] perf_event_task_disable+0x61/0xc0
[  202.857303]  [<ffffffff810daee2>] SyS_prctl+0x3f2/0x690
[  202.864853]  [<ffffffff810daaf0>] ? SyS_umask+0x40/0x40
[  202.872375]  [<ffffffff81136c6a>] ? lockdep_sys_exit+0x1a/0xa0
[  202.880517]  [<ffffffff81004016>] ? lockdep_sys_exit_thunk+0x16/0x30
[  202.889310]  [<ffffffff81b8dabb>] entry_SYSCALL_64_fastpath+0x1e/0xb2
[  202.898177] Memory state around the buggy address:
[  202.905288]  ffff8800cff0bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  202.915044]  ffff8800cff0bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  202.924697] >ffff8800cff0bd80: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
[  202.934420]                          ^
[  202.940352]  ffff8800cff0be00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  202.950141]  ffff8800cff0be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  202.959835] ==================================================================