On Fri, 16 Oct 2015 11:49:36 +0800 Gonglei <arei.gong...@huawei.com> wrote:
> On 2015/10/15 22:39, Christoph Lameter wrote: > > On Thu, 15 Oct 2015, Gonglei (Arei) wrote: > > > >> [ 0.016000] Call Trace: > >> [ 0.016000] [<ffffffff810061dc>] dump_trace+0x6c/0x2d0 > >> [ 0.016000] [<ffffffff81394288>] dump_stack+0x69/0x71 > >> [ 0.016000] [<ffffffff81394308>] panic+0x78/0x199 > >> [ 0.016000] [<ffffffff81050fff>] do_exit+0x26f/0x360 > >> [ 0.016000] [<ffffffff813980a1>] oops_end+0xe1/0xf0 > >> [ 0.016000] [<ffffffff8102d955>] __bad_area_nosemaphore+0x155/0x230 > >> [ 0.016000] [<ffffffff813972ef>] page_fault+0x1f/0x30 > >> [ 0.016000] [<ffffffff810ed93f>] kmem_cache_alloc_node+0xbf/0x140 > >> [ 0.016000] [<ffffffff811dc176>] alloc_cpumask_var_node+0x16/0x70 > >> [ 0.016000] [<ffffffff81019888>] native_send_call_func_ipi+0x18/0xf0 > >> [ 0.016000] [<ffffffff810783ee>] smp_call_function_many+0x1ae/0x250 > >> [ 0.016000] [<ffffffff810784b0>] smp_call_function+0x20/0x30 > >> [ 0.016000] [<ffffffff8101580a>] set_mtrr+0x5a/0x140 > >> [ 0.016000] [<ffffffff8138ef17>] smp_callin+0xf0/0x1b4 > >> [ 0.016000] [<ffffffff8138efe9>] start_secondary+0xe/0xb5 > > > > This happened during IPI processing? > > > >> crash> p cache_cache > > > > Arg. This is the SLAB allocator. You cannot enable debugging without > > rebuilding the kernel with CONFIG_SLAB_DEBUG. > > > >> smp_processor_id() return 14, the CPU14, but the CPU14 is *stuck*, so > >> cache= > >> p->array[14] is NULL, > >> why did this situation happen? And cause NULL pointer accessing? Is this a > >> = > >> kernel bug? > > > > Its likely a bug in some obscure code in a driver that corrupted memory or > > messed up the way memory was handled. set_mtrr()? What was going on at the > > time? A special graphics driver being loaded? That could cause issues. > > > > It seems that the problem was fixed by Igor, right? > https://lkml.org/lkml/2014/3/6/257 That might help. "stuck" CPU14 means that master CPU has given up on the attempt to online AP and tried to clean it up from different maps *but* AP is still running and that may lead to an unexpected behavior. > > Cced Igor Mammedov. > > Regards, > -Gonglei > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
