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    SubjectRe: SLUB doesn't work with kdump kernel on Cell
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    Date
    On Wed, 2007-08-08 at 23:10 +0200, Arnd Bergmann wrote:
    > On Wednesday 08 August 2007, Lucio Correia wrote:
    > > DMA 0 -> 12288
    > > Normal 12288 -> 12288
    > > early_node_map[2] active PFN ranges
    > > 0: 0 -> 2560
    > > 1: 12287 -> 12288
    >
    > As Christoph found, this memory map is really strange. Other machines
    > have something like
    >
    > Zone PFN ranges:
    > DMA 0 -> 16384
    > Normal 16384 -> 16384
    > early_node_map[2] active PFN ranges
    > 0: 0 -> 8192
    > 1: 8192 -> 16384
    >
    > Lucio,
    > What code builds the memory map that gets passed to the kdump kernel?

    The function default_machine_kexec_prepare in
    arch/powerpc/kernel/machine_kexec_64.c.


    > Does the original kernel see the same map on your machine?

    For the original kernel the map is ok:

    Zone PFN ranges:
    DMA 0 -> 16384
    Normal 16384 -> 16384
    early_node_map[2] active PFN ranges
    0: 0 -> 8192
    1: 8192 -> 16384


    > Arnd <><

    I also tried to pass maxcpus=1 for the command line of second kernel,
    and it didn't work. How can I alternatively disable the node?

    Loaded the kernel and crashed it with the commands:


    [root@localhost ~]# kexec -p /boot/vmlinux-2.6.22-5.20070711bsckdump
    --initrd=/boot/initrd-2.6.22-5.20070711bsckdump.img --append="maxcpus=1"
    get memory ranges:1
    Modified cmdline:maxcpus=1 elfcorehdr=41984K savemaxmem=1024M
    root=LABEL=/1
    segment[0].mem:0x2000000 memsz:9371648
    segment[1].mem:0x28f0000 memsz:65536
    segment[2].mem:0x2900000 memsz:65536
    segment[3].mem:0x2910000 memsz:65536
    segment[4].mem:0x2920000 memsz:3735552
    segment[5].mem:0x9ff0000 memsz:65536

    [root@localhost ~]# echo c > /proc/sysrq-trigger


    The boot output for the second kernel is:


    SysRq : Trigger a crashdump
    Sending IPI to other cpus...
    Starting Linux PPC64 #1 SMP Tue Jul 17 09:30:52 CEST 2007
    -----------------------------------------------------
    ppc64_pft_size = 0x0
    physicalMemorySize = 0xa010000
    ppc64_caches.dcache_line_size = 0x80
    ppc64_caches.icache_line_size = 0x80
    htab_address = 0xc000000009800000
    htab_hash_mask = 0x7fff
    physical_start = 0x2000000
    -----------------------------------------------------
    Linux version 2.6.22-5.20070711bsckdump
    (cellbld@cellbuild.boeblingen.de.ibm.com) (gcc version 4.1.2 20070502
    (Red Hat 4.1.27
    *** 0000 : CF000012

    *** 0000 : Setup Arch
    [boot]0012 Setup Arch
    no ISA IO ranges or unexpected isa range,mapping 64k
    mmio NVRAM, 1024k at 0x2401fb00000 mapped to d000080080060000
    Zone PFN ranges:
    DMA 0 -> 12288
    Normal 12288 -> 12288
    early_node_map[2] active PFN ranges
    0: 0 -> 2560
    1: 12287 -> 12288
    *** 0000 : CF000015

    *** 0000 : Setup Done
    [boot]0015 Setup Done
    Built 2 zonelists. Total pages: 2559
    Kernel command line: maxcpus=1 elfcorehdr=41984K savemaxmem=1024M
    root=LABEL=/1
    IIC for CPU 0 target id 0xe : /interrupt-controller@20000508400
    IIC for CPU 1 target id 0xf : /interrupt-controller@20000508400
    IIC for CPU 2 target id 0x1e : /interrupt-controller@30000508400
    IIC for CPU 3 target id 0x1f : /interrupt-controller@30000508400
    spider_pic: node 0, addr:
    0x24000008000 /interrupt-controller@24000008000
    spider_pic: node 1, addr:
    0x34000008000 /interrupt-controller@34000008000
    PID hash table entries: 1024 (order: 10, 8192 bytes)
    Console: colour dummy device 80x25
    console handover: boot [udbg0] -> real [tty0]
    Using Cell machine description
    Found initrd at 0xc000000002920000:0xc000000002cb0000
    Starting Linux PPC64 #1 SMP Tue Jul 17 09:30:52 CEST 2007
    -----------------------------------------------------
    ppc64_pft_size = 0x0
    physicalMemorySize = 0xa010000
    ppc64_caches.dcache_line_size = 0x80
    ppc64_caches.icache_line_size = 0x80
    htab_address = 0xc000000009800000
    htab_hash_mask = 0x7fff
    physical_start = 0x2000000
    -----------------------------------------------------
    Linux version 2.6.22-5.20070711bsckdump
    (cellbld@cellbuild.boeblingen.de.ibm.com) (gcc version 4.1.2 20070502
    (Red Hat 4.1.27
    *** 0000 : CF000012

    *** 0000 : Setup Arch
    [boot]0012 Setup Arch
    no ISA IO ranges or unexpected isa range,mapping 64k
    mmio NVRAM, 1024k at 0x2401fb00000 mapped to d000080080060000
    Zone PFN ranges:
    DMA 0 -> 12288
    Normal 12288 -> 12288
    early_node_map[2] active PFN ranges
    0: 0 -> 2560
    1: 12287 -> 12288
    *** 0000 : CF000015

    *** 0000 : Setup Done
    [boot]0015 Setup Done
    Built 2 zonelists. Total pages: 2559
    Kernel command line: maxcpus=1 elfcorehdr=41984K savemaxmem=1024M
    root=LABEL=/1
    IIC for CPU 0 target id 0xe : /interrupt-controller@20000508400
    IIC for CPU 1 target id 0xf : /interrupt-controller@20000508400
    IIC for CPU 2 target id 0x1e : /interrupt-controller@30000508400
    IIC for CPU 3 target id 0x1f : /interrupt-controller@30000508400
    spider_pic: node 0, addr:
    0x24000008000 /interrupt-controller@24000008000
    spider_pic: node 1, addr:
    0x34000008000 /interrupt-controller@34000008000
    PID hash table entries: 1024 (order: 10, 8192 bytes)
    Console: colour dummy device 80x25
    console handover: boot [udbg0] -> real [tty0]
    Dentry cache hash table entries: 32768 (order: 2, 262144 bytes)
    Inode-cache hash table entries: 16384 (order: 1, 131072 bytes)
    freeing bootmem node 0
    freeing bootmem node 1
    Memory: 112576k/163904k available (6400k kernel code, 51328k reserved,
    1344k data, 870k bss, 448k init)
    ------------[ cut here ]------------
    kernel BUG at mm/slub.c:1802!
    cpu 0x0: Vector: 700 (Program Check) at [c000000002793a60]
    pc: c000000002106f94: .kmem_cache_open+0x1e8/0x338
    lr: c000000002106f88: .kmem_cache_open+0x1dc/0x338
    sp: c000000002793ce0
    msr: 9000000000029032
    current = 0xc0000000026643f0
    paca = 0xc000000002664d00
    pid = 0, comm = swapper
    kernel BUG at mm/slub.c:1802!
    enter ? for help
    [c000000002793da0] c00000000210788c .create_kmalloc_cache+0x70/0xe8
    [c000000002793e50] c0000000025f65cc .kmem_cache_init+0x40/0x16c
    [c000000002793ee0] c0000000025d09a8 .start_kernel+0x2f8/0x404
    [c000000002793f90] c000000002008534 .start_here_common+0x60/0xac
    0:mon>


    --
    Lucio Correia
    Software Engineer
    IBM LTC Brazil

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