The stack looks like this:
[<ffffffff81192015>] put_super+0x25/0x40
[<ffffffff811920f2>] drop_super+0x22/0x30
[<ffffffff81193199>] prune_super+0x149/0x1b0
[<ffffffff8113f241>] shrink_slab+0xa1/0x2d0
[<ffffffff81142b09>] balance_pgdat+0x609/0x7d0
[<ffffffff81142e44>] kswapd+0x174/0x450
[<ffffffff81081810>] kthread+0xc0/0xd0
[<ffffffff8161e3ac>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff
/proc/meminfo says:
$ cat /proc/meminfo
MemTotal: 3934452 kB
MemFree: 865764 kB
Buffers: 398132 kB
Cached: 1527112 kB
SwapCached: 0 kB
Active: 1586392 kB
Inactive: 1236996 kB
Active(anon): 1000348 kB
Inactive(anon): 40136 kB
Active(file): 586044 kB
Inactive(file): 1196860 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 484 kB
Writeback: 0 kB
AnonPages: 898124 kB
Mapped: 111668 kB
Shmem: 142340 kB
Slab: 132552 kB
SReclaimable: 86612 kB
SUnreclaim: 45940 kB
KernelStack: 2920 kB
PageTables: 27052 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1967224 kB
Committed_AS: 2492792 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 376628 kB
VmallocChunk: 34359339160 kB
HardwareCorrupted: 0 kB
AnonHugePages: 118784 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 90112 kB
DirectMap2M: 3995648 kB
/proc/zoneinfo says:
Node 0, zone DMA
pages free 3975
min 65
low 81
high 97
scanned 0
spanned 4080
present 3911
nr_free_pages 3975
nr_inactive_anon 0
nr_active_anon 0
nr_inactive_file 0
nr_active_file 0
nr_unevictable 0
nr_mlock 0
nr_anon_pages 0
nr_mapped 0
nr_file_pages 0
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 0
nr_slab_unreclaimable 0
nr_page_table_pages 0
nr_kernel_stack 0
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 0
nr_dirtied 0
nr_written 0
numa_hit 0
numa_miss 0
numa_foreign 0
numa_interleave 0
numa_local 0
numa_other 0
nr_anon_transparent_hugepages 0
nr_free_cma 0
protection: (0, 3417, 3896, 3896)
pagesets
cpu: 0
count: 0
high: 0
batch: 1
vm stats threshold: 4
cpu: 1
count: 0
high: 0
batch: 1
vm stats threshold: 4
cpu: 2
count: 0
high: 0
batch: 1
vm stats threshold: 4
cpu: 3
count: 0
high: 0
batch: 1
vm stats threshold: 4
all_unreclaimable: 1
start_pfn: 16
inactive_ratio: 1
Node 0, zone DMA32
pages free 208727
min 14763
low 18453
high 22144
scanned 0
spanned 1044480
present 874976
nr_free_pages 208727
nr_inactive_anon 7218
nr_active_anon 189293
nr_inactive_file 295611
nr_active_file 142566
nr_unevictable 0
nr_mlock 0
nr_anon_pages 138923
nr_mapped 25584
nr_file_pages 467056
nr_dirty 208
nr_writeback 0
nr_slab_reclaimable 16532
nr_slab_unreclaimable 3813
nr_page_table_pages 4940
nr_kernel_stack 164
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 28879
nr_dirtied 3350046
nr_written 2639131
numa_hit 47784160
numa_miss 0
numa_foreign 0
numa_interleave 0
numa_local 47784160
numa_other 0
nr_anon_transparent_hugepages 56
nr_free_cma 0
protection: (0, 0, 478, 478)
pagesets
cpu: 0
count: 162
high: 186
batch: 31
vm stats threshold: 36
cpu: 1
count: 77
high: 186
batch: 31
vm stats threshold: 36
cpu: 2
count: 89
high: 186
batch: 31
vm stats threshold: 36
cpu: 3
count: 136
high: 186
batch: 31
vm stats threshold: 36
all_unreclaimable: 0
start_pfn: 4096
inactive_ratio: 5
Node 0, zone Normal
pages free 2318
min 2066
low 2582
high 3099
scanned 0
spanned 124416
present 122472
nr_free_pages 2318
nr_inactive_anon 2842
nr_active_anon 62181
nr_inactive_file 3522
nr_active_file 3943
nr_unevictable 0
nr_mlock 0
nr_anon_pages 57301
nr_mapped 2333
nr_file_pages 14163
nr_dirty 3
nr_writeback 0
nr_slab_reclaimable 5121
nr_slab_unreclaimable 7647
nr_page_table_pages 1824
nr_kernel_stack 201
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 77236
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 6698
nr_dirtied 297229
nr_written 234810
numa_hit 29846177
numa_miss 0
numa_foreign 0
numa_interleave 17548
numa_local 29846177
numa_other 0
nr_anon_transparent_hugepages 2
nr_free_cma 0
protection: (0, 0, 0, 0)
pagesets
cpu: 0
count: 171
high: 186
batch: 31
vm stats threshold: 125
cpu: 1
count: 143
high: 186
batch: 31
vm stats threshold: 125
cpu: 2
count: 169
high: 186
batch: 31
vm stats threshold: 125
cpu: 3
count: 116
high: 186
batch: 31
vm stats threshold: 125
all_unreclaimable: 0
start_pfn: 1048576
inactive_ratio: 1
This is a Lenovo x220 with 4G ram, and IIRC it has an odd memory map
with a tiny high memory zone. It's triggered bugs like this before.
--Andy
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