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    SubjectRe: kernel segv with 2.6.31-rc6 ?
    > On Mon, 2009-08-17 at 22:06 -0700, Roland McGrath wrote:
    > > > I'd be happy to fail to load it. There might be sysfs issues with it
    > too.
    > >
    > > That sounds reasonable to me. And I'd be happy to at least look a
    > little
    > > and maybe give some advice to anybody who finds themself building such a
    > > (free) module, doesn't know why or how it got that way, and wants to
    > ask.
    >
    > Actually, for parisc, its not reasonable. It's expected that our
    > modules have multiple text sections (we have to use -ffunction-sections
    > to generate them in order that the PCREL17 jump stubs can be
    > interleaved).
    >
    > The problem looks to be that some linker error gave the one of the named
    > function text sections a duplicate name. Helge, can you post he objdump
    > info that shows which section had a duplicate name?
    >
    > Even with the duplicate name, though, the module should be perfectly
    > loadable.


    It's the ac97_bus kernel module:
    -rw-r--r-- 1 root root 3.0K 2009-08-19 12:25 ac97_bus.ko


    "objdump -x ac97_bus.ko" shows two .text sections:

    ac97_bus.ko: file format elf32-hppa-linux
    ac97_bus.ko
    architecture: hppa1.1, flags 0x00000011:
    HAS_RELOC, HAS_SYMS
    start address 0x00000000

    Sections:
    Idx Name Size VMA LMA File off Algn
    0 .note.gnu.build-id 00000024 00000000 00000000 00000034 2**2
    CONTENTS, ALLOC, LOAD, READONLY, DATA
    1 .text 00000000 00000000 00000000 00000058 2**0
    CONTENTS, ALLOC, LOAD, READONLY, CODE
    2 .text.ac97_bus_match 0000001c 00000000 00000000 00000058 2**2
    CONTENTS, ALLOC, LOAD, READONLY, CODE
    3 .exit.text 00000030 00000000 00000000 00000074 2**2
    CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
    4 .init.text 00000030 00000000 00000000 000000a4 2**2
    CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
    5 .text 00000000 00000000 00000000 000000d4 2**0
    CONTENTS, ALLOC, LOAD, READONLY, CODE
    6 .rodata.str1.4 00000008 00000000 00000000 000000d4 2**2
    CONTENTS, ALLOC, LOAD, READONLY, DATA
    7 .modinfo 00000040 00000000 00000000 000000dc 2**2
    CONTENTS, ALLOC, LOAD, READONLY, DATA
    8 __ksymtab 00000008 00000000 00000000 0000011c 2**2
    CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
    9 __ksymtab_strings 0000000e 00000000 00000000 00000124 2**0
    CONTENTS, ALLOC, LOAD, READONLY, DATA
    10 .PARISC.unwind 00000030 00000000 00000000 00000134 2**2
    CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
    11 .data 00000034 00000000 00000000 00000164 2**2
    CONTENTS, ALLOC, LOAD, RELOC, DATA
    12 .gnu.linkonce.this_module 00000160 00000000 00000000 00000198 2**2
    CONTENTS, ALLOC, LOAD, RELOC, DATA, LINK_ONCE_DISCARD
    13 .bss 00000000 00000000 00000000 000002f8 2**0
    ALLOC
    14 .comment 0000003a 00000000 00000000 000002f8 2**0
    CONTENTS, READONLY
    SYMBOL TABLE:
    00000000 l d .note.gnu.build-id 00000000 .note.gnu.build-id
    00000000 l d .text 00000000 .text
    00000000 l d .text.ac97_bus_match 00000000 .text.ac97_bus_match
    00000000 l d .exit.text 00000000 .exit.text
    00000000 l d .init.text 00000000 .init.text
    00000000 l d .text 00000000 .text
    00000000 l d .rodata.str1.4 00000000 .rodata.str1.4
    00000000 l d .modinfo 00000000 .modinfo
    00000000 l d __ksymtab 00000000 __ksymtab
    00000000 l d __ksymtab_strings 00000000 __ksymtab_strings
    00000000 l d .PARISC.unwind 00000000 .PARISC.unwind
    00000000 l d .data 00000000 .data
    00000000 l d .gnu.linkonce.this_module 00000000 .gnu.linkonce.this_module
    00000000 l d .bss 00000000 .bss
    00000000 l d .comment 00000000 .comment
    00000000 l F .text.ac97_bus_match 0000001c ac97_bus_match
    00000000 l F .exit.text 00000030 ac97_bus_exit
    00000000 l F .init.text 00000030 ac97_bus_init
    00000000 l O .modinfo 0000000c __mod_license77
    00000000 l O __ksymtab 00000008 __ksymtab_ac97_bus_type
    00000000 l O __ksymtab_strings 0000000e __kstrtab_ac97_bus_type
    0000000c l O .modinfo 00000009 __module_depends
    00000018 l O .modinfo 00000026 __mod_vermagic5
    00000000 g O .gnu.linkonce.this_module 00000160 __this_module
    00000000 g F .exit.text 00000030 cleanup_module
    00000000 g F .init.text 00000030 init_module
    00000000 *UND* 00000000 bus_unregister
    00000000 g O .data 00000034 ac97_bus_type
    00000000 *UND* 00000000 bus_register


    RELOCATION RECORDS FOR [.exit.text]:
    OFFSET TYPE VALUE
    00000010 R_PARISC_DPREL21L ac97_bus_type
    00000014 R_PARISC_DPREL14R ac97_bus_type
    00000018 R_PARISC_PCREL17F bus_unregister


    RELOCATION RECORDS FOR [.init.text]:
    OFFSET TYPE VALUE
    00000010 R_PARISC_DPREL21L ac97_bus_type
    00000014 R_PARISC_DPREL14R ac97_bus_type
    00000018 R_PARISC_PCREL17F bus_register


    RELOCATION RECORDS FOR [__ksymtab]:
    OFFSET TYPE VALUE
    00000000 R_PARISC_DIR32 ac97_bus_type
    00000004 R_PARISC_DIR32 __ksymtab_strings


    RELOCATION RECORDS FOR [.PARISC.unwind]:
    OFFSET TYPE VALUE
    00000000 R_PARISC_SEGREL32 ac97_bus_match
    00000004 R_PARISC_SEGREL32 .text.ac97_bus_match+0x00000018
    00000010 R_PARISC_SEGREL32 ac97_bus_exit
    00000014 R_PARISC_SEGREL32 .exit.text+0x0000002c
    00000020 R_PARISC_SEGREL32 ac97_bus_init
    00000024 R_PARISC_SEGREL32 .init.text+0x0000002c


    RELOCATION RECORDS FOR [.data]:
    OFFSET TYPE VALUE
    00000000 R_PARISC_DIR32 .rodata.str1.4
    00000010 R_PARISC_PLABEL32 ac97_bus_match


    RELOCATION RECORDS FOR [.gnu.linkonce.this_module]:
    OFFSET TYPE VALUE
    000000d4 R_PARISC_PLABEL32 init_module
    00000150 R_PARISC_PLABEL32 cleanup_module


    Helge
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