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| author | Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> | 2017-11-30 11:33:22 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-12-04 08:03:19 +0300 |
| commit | 5aa04b3eb6fca63d2e9827be656dcadc26d54e11 (patch) | |
| tree | b07e919885c34c47cc2c7b644422a0291922d4ac /arch/powerpc/platforms/ps3 | |
| parent | ae64f9bd1d3621b5e60d7363bc20afb46aede215 (diff) | |
| download | linux-5aa04b3eb6fca63d2e9827be656dcadc26d54e11.tar.xz | |
powerpc/perf: Fix oops when grouping different pmu events
When user tries to group imc (In-Memory Collections) event with
normal event, (sometime) kernel crashes with following log:
Faulting instruction address: 0x00000000
[link register ] c00000000010ce88 power_check_constraints+0x128/0x980
...
c00000000010e238 power_pmu_event_init+0x268/0x6f0
c0000000002dc60c perf_try_init_event+0xdc/0x1a0
c0000000002dce88 perf_event_alloc+0x7b8/0xac0
c0000000002e92e0 SyS_perf_event_open+0x530/0xda0
c00000000000b004 system_call+0x38/0xe0
'event_base' field of 'struct hw_perf_event' is used as flags for
normal hw events and used as memory address for imc events. While
grouping these two types of events, collect_events() tries to
interpret imc 'event_base' as a flag, which causes a corruption
resulting in a crash.
Consider only those events which belongs to 'perf_hw_context' in
collect_events().
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Reviewed-By: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/ps3')
0 files changed, 0 insertions, 0 deletions