On Tue, 2017-12-05 at 05:30:38 UTC, Anju T Sudhakar wrote: > Call trace observed during boot: > > > > Faulting instruction address: 0xc000000000248340 > > cpu 0x0: Vector: 380 (Data Access Out of Range) at [c000000ff66fb850] > > pc: c000000000248340: event_function_call+0x50/0x1f0 > > lr: c00000000024878c: perf_remove_from_context+0x3c/0x100 > > sp: c000000ff66fbad0 > > msr: 9000000000009033 > > dar: 7d20e2a6f92d03c0 > > current = 0xc000000ff6679200 > > paca = 0xc00000000fd40000 softe: 0 irq_happened: 0x01 > > pid = 14, comm = cpuhp/0 > > Linux version 4.14.0-rc2-42789-ge8eae4b (rgrimm@XXXX) (gcc version 5.4.0 > > 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.4)) #1 SMP Thu Nov 16 14:35:14 CST > > 2017 > > enter ? for help > > [c000000ff66fbb80] c00000000024878c perf_remove_from_context+0x3c/0x100 > > [c000000ff66fbbc0] c00000000024e84c perf_pmu_migrate_context+0x10c/0x380 > > [c000000ff66fbc60] c0000000000ca050 ppc_nest_imc_cpu_offline+0x1b0/0x210 > > [c000000ff66fbcb0] c0000000000d5d54 cpuhp_invoke_callback+0x194/0x620 > > [c000000ff66fbd20] c0000000000d702c cpuhp_thread_fun+0x7c/0x1b0 > > [c000000ff66fbd60] c00000000010ad90 smpboot_thread_fn+0x290/0x2a0 > > [c000000ff66fbdc0] c000000000104818 kthread+0x168/0x1b0 > > [c000000ff66fbe30] c00000000000b5a0 ret_from_kernel_thread+0x5c/0xbc > > > > While registering the cpuhotplug callbacks for nest-imc, if we fail in the > > cpuhotplug online path for any random node in a multi node system (because > > the opal call to stop nest-imc counters fails for that node), > > ppc_nest_imc_cpu_offline() will get invoked for other nodes who successfully > > returned from cpuhotplug online path. > > > > This call trace is generated since in the ppc_nest_imc_cpu_offline() > > path we are trying to migrate the event context, when nest-imc counters are > > not even initialized. > > > > Patch to add a check to ensure that nest-imc is registered before migrating > > the event context. > > Note: > > Madhavan Srinivasan has recently send a skiboot patch to have a check in the > > skiboot code to make sure that the microcode is initialized in all the > chips, > before enabling the nest units. > > https://patchwork.ozlabs.org/patch/844047/ (v2) > > > Signed-off-by: Anju T Sudhakar <a...@linux.vnet.ibm.com> > Reviewed-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/ad2b6e01024ef23bddc3ce0bcb115e cheers
