[Call Trace: 2.6.37-rc1-git7 & 2.6.37-rc1-git8, Powerpc] LTP msgctl11 test case

[Subrata Modak]

Hi Peter/Ingo,

LTPś msgctl11 test case creates Call trace and Exception for kernels
2.6.37-rc1-git7 & 2.6.37-rc1-git8. Please see the dmesg below:

================================================
msgctl11: page allocation failure. order:0, mode:0x20
Call Trace:
[c0000000fffcef30] [c000000000014c74] .show_stack+0x74/0x1c0 (unreliable)
[c0000000fffcefe0] [c00000000015e938] .__alloc_pages_nodemask+0x6d8/0x950
[c0000000fffcf160] [c0000000001a0c60] .alloc_pages_current+0xa0/0x160
[c0000000fffcf200] [c0000000001abfd8] .new_slab+0x358/0x370
[c0000000fffcf2b0] [c0000000001ac1cc] .__slab_alloc+0x1dc/0x500
[c0000000fffcf390] [c0000000001ad808] .kmem_cache_alloc+0x1a8/0x1b0
[c0000000fffcf440] [c0000000004eec88] .scsi_pool_alloc_command+0x58/0xa0
[c0000000fffcf4d0] [c0000000004eed60] .scsi_host_alloc_command+0x30/0xb0
[c0000000fffcf560] [c0000000004eee00] .__scsi_get_command+0x20/0xd0
[c0000000fffcf5f0] [c0000000004ef158] .scsi_get_command+0x58/0xf0
[c0000000fffcf690] [c0000000004f7948] .scsi_setup_fs_cmnd+0x108/0x120
[c0000000fffcf720] [d000000001484ad8] .sd_prep_fn+0x2b8/0xc70 [sd_mod]
[c0000000fffcf800] [c0000000003ea92c] .blk_peek_request+0x14c/0x310
[c0000000fffcf8b0] [c0000000004f6b14] .scsi_request_fn+0x94/0x560
[c0000000fffcf980] [c0000000003eba00] .__blk_run_queue+0x90/0x1b0
[c0000000fffcfa00] [c0000000003ebc20] .blk_run_queue+0x30/0x60
[c0000000fffcfa90] [c0000000004f5d84] .scsi_run_queue+0x104/0x3c0
[c0000000fffcfb60] [c0000000004f7228] .scsi_next_command+0x48/0x70
[c0000000fffcfbf0] [c0000000004f8280] .scsi_io_completion+0x3e0/0x580
[c0000000fffcfcd0] [c0000000004ee0a8] .scsi_finish_command+0x128/0x180
[c0000000fffcfd70] [c0000000004f8548] .scsi_softirq_done+0x118/0x1e0
[c0000000fffcfe10] [c0000000003f2410] .blk_done_softirq+0xb0/0xe0
[c0000000fffcfea0] [c0000000000943c8] .__do_softirq+0x118/0x290
[c0000000fffcff90] [c000000000031f58] .call_do_softirq+0x14/0x24
[c0000000a0992a20] [c00000000000f554] .do_softirq+0xf4/0x120
[c0000000a0992ac0] [c0000000000941d4] .irq_exit+0xb4/0xc0
[c0000000a0992b40] [c00000000000f7e0] .do_IRQ+0x160/0x2c0
[c0000000a0992c00] [c000000000004898] hardware_interrupt_entry+0x18/0x80
--- Exception: 501 at .do_raw_spin_unlock+0x80/0xe0
    LR = ._raw_spin_unlock+0x30/0x50
[c0000000a0992f70] [c00000000018943c] .__page_check_address+0x16c/0x1a0
[c0000000a0993010] [c00000000018a5b4] .page_referenced_one+0x54/0x200
[c0000000a09930d0] [c00000000018ab4c] .page_referenced+0x3ec/0x490
[c0000000a0993200] [c000000000168bbc] .shrink_page_list+0x2bc/0x6d0
[c0000000a0993350] [c00000000016942c] .shrink_inactive_list+0x15c/0x580
[c0000000a0993460] [c000000000169f10] .shrink_zone+0x2e0/0x4b0
[c0000000a0993580] [c00000000016b3c0] .do_try_to_free_pages+0x110/0x510
[c0000000a0993670] [c00000000016bb3c] .try_to_free_pages+0xbc/0x1a0
[c0000000a0993780] [c00000000015e7a0] .__alloc_pages_nodemask+0x540/0x950
[c0000000a0993900] [c0000000001a0db8] .alloc_page_vma+0x98/0x1d0
[c0000000a09939a0] [c00000000017c7f4] .do_wp_page+0x144/0xb60
[c0000000a0993a90] [c00000000017eef0] .handle_mm_fault+0x670/0xb50
[c0000000a0993b80] [c0000000006feea4] .do_page_fault+0x344/0x780
[c0000000a0993e30] [c00000000000522c] handle_page_fault+0x20/0x74
Mem-Info:
Node 0 DMA per-cpu:
CPU    0: hi:    6, btch:   1 usd:   4
CPU    1: hi:    6, btch:   1 usd:   5
CPU    2: hi:    6, btch:   1 usd:   0
CPU    3: hi:    6, btch:   1 usd:   0
CPU    4: hi:    6, btch:   1 usd:   0
CPU    5: hi:    6, btch:   1 usd:   0
CPU    6: hi:    6, btch:   1 usd:   4
CPU    7: hi:    6, btch:   1 usd:   0
CPU    8: hi:    6, btch:   1 usd:   2
CPU    9: hi:    6, btch:   1 usd:   0
CPU   10: hi:    6, btch:   1 usd:   0
CPU   11: hi:    6, btch:   1 usd:   0
CPU   12: hi:    6, btch:   1 usd:   0
CPU   13: hi:    6, btch:   1 usd:   0
CPU   14: hi:    6, btch:   1 usd:   0
CPU   15: hi:    6, btch:   1 usd:   0
CPU   16: hi:    6, btch:   1 usd:   0
CPU   17: hi:    6, btch:   1 usd:   2
CPU   18: hi:    6, btch:   1 usd:   2
CPU   19: hi:    6, btch:   1 usd:   0
CPU   20: hi:    6, btch:   1 usd:   3
CPU   21: hi:    6, btch:   1 usd:   1
CPU   22: hi:    6, btch:   1 usd:   1
CPU   23: hi:    6, btch:   1 usd:   0
active_anon:17322 inactive_anon:4230 isolated_anon:2650
 active_file:7 inactive_file:29 isolated_file:46
 unevictable:0 dirty:0 writeback:343 unstable:0
 free:57 slab_reclaimable:426 slab_unreclaimable:22103
 mapped:19 shmem:0 pagetables:16551 bounce:0
Node 0 DMA free:832kB min:8128kB low:10112kB high:12160kB active_anon:1108608kB inactive_anon:270720kB active_file:448kB inactive_file:1856kB unevictable:0kB isolated(anon):169600kB isolated(file):2944kB present:4190720kB mlocked:0kB dirty:0kB writeback:21952kB mapped:1216kB shmem:0kB slab_reclaimable:27264kB slab_unreclaimable:1414592kB kernel_stack:156336kB pagetables:1059264kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:69 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
Node 0 DMA: 7*64kB 3*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 832kB
5188 total pagecache pages
4932 pages in swap cache
Swap cache stats: add 37086, delete 32154, find 29567/36415
Free swap  = 3652416kB
Total swap = 4095936kB
65536 pages RAM
1557 pages reserved
31189 pages shared
59735 pages non-shared
SLUB: Unable to allocate memory on node -1 (gfp=0x20)
  cache: kmalloc-128, object size: 128, buffer size: 128, default order: 0, min order: 0
  node 0: slabs: 92, objs: 47104, free: 0
================================================

Ways to reproduce the problem:
1) Fetch, build and install LTP:
        git clone git://ltp.git.sourceforge.net/gitroot/ltp/ltp
        cd ltp
        ./configure
        make
        make install
2) Execute
        cd /opt/ltp
        ./runltp -s msgctl11 -k DMESG_LOG_DIR

Verify the results under /opt/ltp/results and /opt/ltp/output directory

Regards--
Subrata