mmap regression on power7?

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Noticed that this test is failing at the moment up to v3.8.0-rc1,
http://ltp.git.sourceforge.net/git/gitweb.cgi?p=ltp/ltp.git;a=blob;f=testcases/kernel/mem/mtest06/mmap1.c

mmap1       0  TINFO  :  created writing thread[70366791266816]
mmap1       0  TINFO  :  [70366791266816] - map, change contents, unmap files 1000 times
mmap1       0  TINFO  :  [70366799655424] - read contents of memory 0x3fff8b180000 1000 times
mmap1       0  TINFO  :  created reading thread[70366799655424]
mmap1       0  TINFO  :  [70366799655424] Unexpected page fault at 0x3fff8b1803a8

Bisecting going back to v2.6.38 has no such problem and keep running
despite sometimes it triggered memory allocation failures.

swapper: page allocation failure. order:0, mode:0x0
Call Trace:
[c00000013feab370] [c0000000000143f4] .show_stack+0x74/0x1c0 (unreliable)
[c00000013feab420] [c0000000001474d0] .__alloc_pages_nodemask+0x4f0/0x8e0
[c00000013feab5c0] [c000000000031870] .iommu_alloc_coherent+0x100/0x280
[c00000013feab680] [c000000000031020] .dma_iommu_alloc_coherent+0x30/0x50
[c00000013feab6f0] [d000000001712220] .ibmvscsi_queuecommand+0x5b0/0x600 [ibmvscsic]
[c00000013feab7d0] [c0000000003aa0d0] .scsi_dispatch_cmd+0x120/0x380
[c00000013feab870] [c0000000003b2a8c] .scsi_request_fn+0x4fc/0x620
[c00000013feab950] [c0000000002a13ac] .__blk_run_queue+0x15c/0x1c0
[c00000013feab9e0] [c0000000002a1514] .blk_run_queue+0x34/0x60
[c00000013feaba70] [c0000000003b1894] .scsi_run_queue+0x114/0x450
[c00000013feabb50] [c0000000003b2de8] .scsi_next_command+0x48/0x70
[c00000013feabbe0] [c0000000003b3e60] .scsi_io_completion+0x3e0/0x580
[c00000013feabcc0] [c0000000003a9d98] .scsi_finish_command+0x128/0x180
[c00000013feabd60] [c0000000003b4118] .scsi_softirq_done+0x108/0x1d0
[c00000013feabe00] [c0000000002a795c] .blk_done_softirq+0xbc/0xf0
[c00000013feabea0] [c000000000092e90] .__do_softirq+0x110/0x290
[c00000013feabf90] [c000000000020eb8] .call_do_softirq+0x14/0x24
[c00000013e963960] [c00000000000f2b4] .do_softirq+0xf4/0x120
[c00000013e963a00] [c000000000092ca4] .irq_exit+0xb4/0xc0
[c00000013e963a80] [c00000000000f540] .do_IRQ+0x160/0x2c0
[c00000013e963b40] [c000000000004898] hardware_interrupt_entry+0x18/0x80
--- Exception: 501 at .arch_local_irq_restore+0x34/0x60
    LR = .cpu_idle+0x170/0x210
[c00000013e963e30] [c000000000016c14] .cpu_idle+0x164/0x210 (unreliable)
[c00000013e963ee0] [c00000000059e454] .start_secondary+0x324/0x35c
[c00000013e963f90] [c000000000008268] .start_secondary_prolog+0x10/0x14
Mem-Info:
Node 0 DMA per-cpu:
CPU    0: hi:    6, btch:   1 usd:   5
CPU    1: hi:    6, btch:   1 usd:   1
CPU    2: hi:    6, btch:   1 usd:   5
CPU    3: hi:    6, btch:   1 usd:   5
CPU    4: hi:    6, btch:   1 usd:   3
CPU    5: hi:    6, btch:   1 usd:   1
CPU    6: hi:    6, btch:   1 usd:   5
CPU    7: hi:    6, btch:   1 usd:   4
CPU    8: hi:    6, btch:   1 usd:   1
CPU    9: hi:    6, btch:   1 usd:   5
CPU   10: hi:    6, btch:   1 usd:   5
CPU   11: hi:    6, btch:   1 usd:   5
CPU   12: hi:    6, btch:   1 usd:   4
CPU   13: hi:    6, btch:   1 usd:   1
CPU   14: hi:    6, btch:   1 usd:   5
CPU   15: hi:    6, btch:   1 usd:   3
CPU   16: hi:    6, btch:   1 usd:   5
CPU   17: hi:    6, btch:   1 usd:   1
CPU   18: hi:    6, btch:   1 usd:   5
CPU   19: hi:    6, btch:   1 usd:   2
CPU   20: hi:    6, btch:   1 usd:   4
CPU   21: hi:    6, btch:   1 usd:   1
CPU   22: hi:    6, btch:   1 usd:   5
CPU   23: hi:    6, btch:   1 usd:   1
CPU   24: hi:    6, btch:   1 usd:   5
CPU   25: hi:    6, btch:   1 usd:   1
CPU   26: hi:    6, btch:   1 usd:   5
CPU   27: hi:    6, btch:   1 usd:   5
CPU   28: hi:    6, btch:   1 usd:   5
CPU   29: hi:    6, btch:   1 usd:   1
CPU   30: hi:    6, btch:   1 usd:   1
CPU   31: hi:    6, btch:   1 usd:   1
CPU   32: hi:    6, btch:   1 usd:   5
CPU   33: hi:    6, btch:   1 usd:   5
CPU   34: hi:    6, btch:   1 usd:   1
CPU   35: hi:    6, btch:   1 usd:   1
CPU   36: hi:    6, btch:   1 usd:   5
CPU   37: hi:    6, btch:   1 usd:   5
CPU   38: hi:    6, btch:   1 usd:   4
CPU   39: hi:    6, btch:   1 usd:   2
CPU   40: hi:    6, btch:   1 usd:   4
CPU   41: hi:    6, btch:   1 usd:   5
CPU   42: hi:    6, btch:   1 usd:   5
CPU   43: hi:    6, btch:   1 usd:   2
CPU   44: hi:    6, btch:   1 usd:   5
CPU   45: hi:    6, btch:   1 usd:   5
CPU   46: hi:    6, btch:   1 usd:   5
CPU   47: hi:    6, btch:   1 usd:   5
CPU   48: hi:    6, btch:   1 usd:   1
CPU   49: hi:    6, btch:   1 usd:   1
CPU   50: hi:    6, btch:   1 usd:   3
CPU   51: hi:    6, btch:   1 usd:   5
CPU   52: hi:    6, btch:   1 usd:   5
CPU   53: hi:    6, btch:   1 usd:   2
CPU   54: hi:    6, btch:   1 usd:   5
CPU   55: hi:    6, btch:   1 usd:   5
CPU   56: hi:    6, btch:   1 usd:   1
CPU   57: hi:    6, btch:   1 usd:   1
CPU   58: hi:    6, btch:   1 usd:   5
CPU   59: hi:    6, btch:   1 usd:   4
Node 1 DMA per-cpu:
CPU    0: hi:    6, btch:   1 usd:   5
CPU    1: hi:    6, btch:   1 usd:   5
CPU    2: hi:    6, btch:   1 usd:   5
CPU    3: hi:    6, btch:   1 usd:   4
CPU    4: hi:    6, btch:   1 usd:   5
CPU    5: hi:    6, btch:   1 usd:   3
CPU    6: hi:    6, btch:   1 usd:   5
CPU    7: hi:    6, btch:   1 usd:   5
CPU    8: hi:    6, btch:   1 usd:   5
CPU    9: hi:    6, btch:   1 usd:   2
CPU   10: hi:    6, btch:   1 usd:   5
CPU   11: hi:    6, btch:   1 usd:   3
CPU   12: hi:    6, btch:   1 usd:   5
CPU   13: hi:    6, btch:   1 usd:   2
CPU   14: hi:    6, btch:   1 usd:   5
CPU   15: hi:    6, btch:   1 usd:   4
CPU   16: hi:    6, btch:   1 usd:   5
CPU   17: hi:    6, btch:   1 usd:   5
CPU   18: hi:    6, btch:   1 usd:   5
CPU   19: hi:    6, btch:   1 usd:   5
CPU   20: hi:    6, btch:   1 usd:   5
CPU   21: hi:    6, btch:   1 usd:   5
CPU   22: hi:    6, btch:   1 usd:   5
CPU   23: hi:    6, btch:   1 usd:   4
CPU   24: hi:    6, btch:   1 usd:   5
CPU   25: hi:    6, btch:   1 usd:   4
CPU   26: hi:    6, btch:   1 usd:   5
CPU   27: hi:    6, btch:   1 usd:   5
CPU   28: hi:    6, btch:   1 usd:   5
CPU   29: hi:    6, btch:   1 usd:   1
CPU   30: hi:    6, btch:   1 usd:   5
CPU   31: hi:    6, btch:   1 usd:   5
CPU   32: hi:    6, btch:   1 usd:   5
CPU   33: hi:    6, btch:   1 usd:   5
CPU   34: hi:    6, btch:   1 usd:   2
CPU   35: hi:    6, btch:   1 usd:   5
CPU   36: hi:    6, btch:   1 usd:   5
CPU   37: hi:    6, btch:   1 usd:   5
CPU   38: hi:    6, btch:   1 usd:   1
CPU   39: hi:    6, btch:   1 usd:   4
CPU   40: hi:    6, btch:   1 usd:   0
CPU   41: hi:    6, btch:   1 usd:   4
CPU   42: hi:    6, btch:   1 usd:   5
CPU   43: hi:    6, btch:   1 usd:   5
CPU   44: hi:    6, btch:   1 usd:   5
CPU   45: hi:    6, btch:   1 usd:   5
CPU   46: hi:    6, btch:   1 usd:   5
CPU   47: hi:    6, btch:   1 usd:   4
CPU   48: hi:    6, btch:   1 usd:   5
CPU   49: hi:    6, btch:   1 usd:   3
CPU   50: hi:    6, btch:   1 usd:   5
CPU   51: hi:    6, btch:   1 usd:   5
CPU   52: hi:    6, btch:   1 usd:   5
CPU   53: hi:    6, btch:   1 usd:   2
CPU   54: hi:    6, btch:   1 usd:   2
CPU   55: hi:    6, btch:   1 usd:   2
CPU   56: hi:    6, btch:   1 usd:   5
CPU   57: hi:    6, btch:   1 usd:   1
CPU   58: hi:    6, btch:   1 usd:   5
CPU   59: hi:    6, btch:   1 usd:   5
active_anon:2553 inactive_anon:3246 isolated_anon:0
 active_file:34958 inactive_file:31322 isolated_file:0
 unevictable:0 dirty:13086 writeback:1581 unstable:0
 free:291 slab_reclaimable:2076 slab_unreclaimable:3873
 mapped:186 shmem:3 pagetables:796 bounce:0
Node 0 DMA free:10176kB min:7296kB low:9088kB high:10944kB active_anon:96128kB inactive_anon:138368kB active_file:1837440kB inactive_file:1605056kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:4190720kB mlocked:0kB dirty:459840kB writeback:62848kB mapped:11840kB shmem:192kB slab_reclaimable:127360kB slab_unreclaimable:226688kB kernel_stack:9088kB pagetables:35520kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:32 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Node 1 DMA free:8448kB min:1792kB low:2240kB high:2688kB active_anon:67264kB inactive_anon:69376kB active_file:399872kB inactive_file:399552kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:1047680kB mlocked:0kB dirty:377664kB writeback:38336kB mapped:64kB shmem:0kB slab_reclaimable:5504kB slab_unreclaimable:21184kB kernel_stack:480kB pagetables:15424kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Node 0 DMA: 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 0kB
Node 1 DMA: 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 0kB
66497 total pagecache pages
56 pages in swap cache
Swap cache stats: add 538, delete 482, find 127/141
Free swap  = 5161024kB
Total swap = 5177280kB
81920 pages RAM
900 pages reserved
47062 pages shared
39873 pages non-shared
sd 0:0:1:0: Can't allocate memory for indirect table
sd 0:0:1:0: couldn't convert cmd to srp_cmd

CAI Qian

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