BUG: zonelist->_zonerefs == 0x1c08

Dave Young dyoung at redhat.com
Tue Nov 22 20:23:04 EST 2011 

On 11/22/2011 11:27 PM, Vivek Goyal wrote:

> On Tue, Nov 22, 2011 at 02:00:24AM -0800, David Rientjes wrote:
>> On Tue, 22 Nov 2011, Dave Young wrote:
>>
>>> [    0.000000] Linux version 3.2.0-rc2+ (dave at darkstar) (gcc version
>>> 4.5.2 (GCC) ) #256 SMP
>>> [    0.000000] Command line: ro root=/dev/mapper/vg_dellper71001-lv_root
>>> rd_LVM_LV=vg_dellp
>>> [    0.000000] KERNEL supported cpus:
>>> [    0.000000]   Intel GenuineIntel
>>> [    0.000000]   AMD AuthenticAMD
>>> [    0.000000]   Centaur CentaurHauls
>>> [    0.000000] BIOS-provided physical RAM map:
>>> [    0.000000]  BIOS-e820: 0000000000000100 - 00000000000a0000 (usable)
>>> [    0.000000]  BIOS-e820: 0000000000100000 - 00000000cf379000 (usable)
>>> [    0.000000]  BIOS-e820: 00000000cf379000 - 00000000cf38f000 (reserved)
>>> [    0.000000]  BIOS-e820: 00000000cf38f000 - 00000000cf3ce000 (ACPI data)
>>> [    0.000000]  BIOS-e820: 00000000cf3ce000 - 00000000d0000000 (reserved)
>>> [    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
>>> [    0.000000]  BIOS-e820: 00000000fe000000 - 0000000100000000 (reserved)
>>> [    0.000000]  BIOS-e820: 0000000100000000 - 0000000630000000 (usable)
>>> [    0.000000] last_pfn = 0x630000 max_arch_pfn = 0x400000000
>>> [    0.000000] NX (Execute Disable) protection: active
>>> [    0.000000] user-defined physical RAM map:
>>> [    0.000000]  user: 0000000000000000 - 0000000000010000 (reserved)
>>> [    0.000000]  user: 0000000000010000 - 00000000000a0000 (usable)
>>> [    0.000000]  user: 0000000003090000 - 000000000affb000 (usable)
>>> [    0.000000]  user: 00000000cf379000 - 00000000cf38f000 (reserved)
>>> [    0.000000]  user: 00000000cf38f000 - 00000000cf3ce000 (ACPI data)
>>> [    0.000000]  user: 00000000cf3ce000 - 00000000d0000000 (reserved)
>>> [    0.000000]  user: 00000000e0000000 - 00000000f0000000 (reserved)
>>> [    0.000000]  user: 00000000fe000000 - 0000000100000000 (reserved)
>>> [    0.000000] DMI 2.6 present.
>>> [    0.000000] No AGP bridge found
>>> [    0.000000] last_pfn = 0xaffb max_arch_pfn = 0x400000000
>>> [    0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new
>>> 0x7010600070106
>>> [    0.000000] found SMP MP-table at [ffff8800000fe710] fe710
>>> [    0.000000] Using GB pages for direct mapping
>>> [    0.000000] init_memory_mapping: 0000000000000000-000000000affb000
>>> [    0.000000] RAMDISK: 0ac79000 - 0afef000
>>> [    0.000000] ACPI: RSDP 00000000000f1240 00024 (v02 DELL  )
>>> [    0.000000] ACPI: XSDT 00000000000f1344 0009C (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: FACP 00000000cf3b3f9c 000F4 (v03 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: DSDT 00000000cf38f000 03D72 (v01 DELL   PE_SC3
>>> 00000001 INTL 2005062
>>> [    0.000000] ACPI: FACS 00000000cf3b6000 00040
>>> [    0.000000] ACPI: APIC 00000000cf3b3478 0015E (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: SPCR 00000000cf3b35d8 00050 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: HPET 00000000cf3b362c 00038 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: DMAR 00000000cf3b3668 001C0 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: MCFG 00000000cf3b38c4 0003C (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: WD__ 00000000cf3b3904 00134 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: SLIC 00000000cf3b3a3c 00176 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: ERST 00000000cf392ef4 00270 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: HEST 00000000cf393164 003A8 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: BERT 00000000cf392d74 00030 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: EINJ 00000000cf392da4 00150 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: SRAT 00000000cf3b3bc0 00370 (v01 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: TCPA 00000000cf3b3f34 00064 (v02 DELL   PE_SC3
>>> 00000001 DELL 0000000
>>> [    0.000000] ACPI: SSDT 00000000cf3b7000 02A4C (v01  INTEL PPM RCM
>>> 80000001 INTL 2006110
>>> [    0.000000] SRAT: PXM 1 -> APIC 0x20 -> Node 0
>>> [    0.000000] SRAT: PXM 2 -> APIC 0x00 -> Node 1
>>> [    0.000000] SRAT: PXM 1 -> APIC 0x34 -> Node 0
>>> [    0.000000] SRAT: PXM 2 -> APIC 0x14 -> Node 1
>>> [    0.000000] SRAT: PXM 1 -> APIC 0x21 -> Node 0
>>> [    0.000000] SRAT: PXM 2 -> APIC 0x01 -> Node 1
>>> [    0.000000] SRAT: PXM 1 -> APIC 0x35 -> Node 0
>>> [    0.000000] SRAT: PXM 2 -> APIC 0x15 -> Node 1
>>> [    0.000000] SRAT: Node 1 PXM 2 0-d0000000
>>> [    0.000000] SRAT: Node 1 PXM 2 100000000-330000000
>>> [    0.000000] SRAT: Node 0 PXM 1 330000000-630000000
>>> [    0.000000] Initmem setup node 1 0000000000000000-000000000affb000
>>> [    0.000000]   NODE_DATA [000000000aff6000 - 000000000affafff]
>>
>> blk_throtl_init() is trying to allocate on a specific node and it appears 
>> like its zonelists were never built successfully.  I'd guess it's trying 
>> to allocate on node 0 since it's not onlined above, probably because this 
>> is the crashkernel.  Your SRAT maps two different nodes but it's only 
>> onlining node 1 and not node 0.
>>
>> The problem is that blk_alloc_queue_node() allocs the requeue_queue with 
>> __GFP_ZERO, which zeros it and never initialized the node field so it 
>> remains zero.  blk_throtl_init() then calls kzalloc_node() on node 0 which 
>> doesn't have initialized zonelists.
>>
>> Maybe try this?
>>
>> diff --git a/block/blk-core.c b/block/blk-core.c
>> index ea70e6c..99c1881 100644
>> --- a/block/blk-core.c
>> +++ b/block/blk-core.c
>> @@ -467,6 +467,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
>>  	q->backing_dev_info.state = 0;
>>  	q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;
>>  	q->backing_dev_info.name = "block";
>> +	q->node = node_id;
>>  
> 
> Storing q->node info at queue allocation time makes sense to me. In fact
> it might make sense to clean it up from blk_init_allocated_queue_node
> and assume that passed queue has queue->node set at the allocation time.
> 
> CCing Mike Snitzer who introduced blk_init_allocated_queue_node(). Mike
> what do you think. I am not sure it makes sense to pass in nodeid, both
> at queue allocation and queue initialization time. To me, it should make
> more sense to allocate the queue at one node and that becomes the default
> node for reset of the initialization.
> 
> I am wondering why node0 is not coming up in kdump kernel. Assuming that
> you must have reserved memory in node0 in first kernel, shouldn't it come
> up in second kernel?


Vivek, the reserved memory stay in node1 in first kernel also:
see following kmsg:
	SRAT: Node 1 PXM 2 0-d0000000
	SRAT: Node 1 PXM 2 100000000-330000000
	SRAT: Node 0 PXM 1 330000000-630000000>

> Thanks
> Vivek
> 
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-- 
Thanks
Dave

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