rebase segfault
marco atzeri
marco.atzeri@gmail.com
Tue Jan 15 10:36:00 GMT 2013
On 1/15/2013 11:07 AM, Corinna Vinschen wrote:
> On Jan 15 09:43, marco atzeri wrote:
>> rebase is segfaulting on two dlls of new package
>>
>> postgresql-contrib-9.2.2-1
>>
>> Full packages here
>> http://matzeri.altervista.org/cygwin-1.7/postgresql/
>>
>> Just the two dll's here:
>> http://matzeri.altervista.org/works/rebase/
>>
>> for i in *.dll; do echo $i ; rebase -O $i ; done
>>
>> dict_snowball.dll
>> Segmentation fault (core dumped)
>>
>> ltree.dll
>> Segmentation fault (core dumped)
>
> I don't know exactly what's going on here, but there's a common
> factor:
>
> $ objdump -h dict_snowball.dll
>
> dict_snowball.dll: file format pei-i386
>
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .text 00016808 4ef01000 4ef01000 00000400 2**4
> CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
> 1 .data 00017180 4ef18000 4ef18000 00016e00 2**5
> CONTENTS, ALLOC, LOAD, DATA
> 2 .bss 000000f8 4ef30000 4ef30000 00000000 2**5
> ALLOC
> 3 .edata 00000fe0 4ef31000 4ef31000 0002e000 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 4 .idata 000003e0 4ef32000 4ef32000 0002f000 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 5 .reloc 0000765c 4ef33000 4ef33000 0002f400 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 6 .gnu_deb 0000001c 4ef3b000 4ef3b000 00036c00 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
>
> $ objdump -h ltree.dll
>
> ltree.dll: file format pei-i386
>
> Sections:
> Idx Name Size VMA LMA File off Algn
> 0 .text 000088a8 4ef31000 4ef31000 00000400 2**4
> CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
> 1 .data 00000dc0 4ef3a000 4ef3a000 00008e00 2**5
> CONTENTS, ALLOC, LOAD, DATA
> 2 .bss 000000f8 4ef3b000 4ef3b000 00000000 2**5
> ALLOC
> 3 .edata 00000e3c 4ef3c000 4ef3c000 00009c00 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 4 .idata 000005b8 4ef3d000 4ef3d000 0000ac00 2**2
> CONTENTS, ALLOC, LOAD, DATA
> 5 .reloc 00000adc 4ef3e000 4ef3e000 0000b200 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
> 6 .gnu_deb 00000014 4ef3f000 4ef3f000 0000be00 2**2
> CONTENTS, ALLOC, LOAD, READONLY, DATA
>
> Both DLLs have a section .gnu_deb, whatever that one is good for.
> Rebase crashes both times when trying to relocate this .gnu_deb section.
> As you can see, the .gnu_deb section is pretty small, only 28 resp. 20
> bytes. What happens is that the relocation information for the .gnu_deb
> section appears to be too big. In case of dict_snowball.dll, the reloc
> info covers 44 relocation entries. The segfault occurs as soon as one
> entry translates into a memory address which is beyond the committed
> area of the file memory map.
>
> Now, that's the *effect*. From this I can't say what the *cause*
> for this weird relocation info is.
>
>
> Corinna
>
It seems the result of the .dbg creation, that trunks
wrongly the sections.
I uploaded also the build and stripped versions:
$ objdump.exe -h build/dict_snowball.dll
build/dict_snowball.dll: file format pei-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00016808 67ec1000 67ec1000 00000400 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
1 .data 00017180 67ed8000 67ed8000 00016e00 2**5
CONTENTS, ALLOC, LOAD, DATA
2 .bss 000000f8 67ef0000 67ef0000 00000000 2**5
ALLOC
3 .edata 00000fe0 67ef1000 67ef1000 0002e000 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .idata 000003e0 67ef2000 67ef2000 0002f000 2**2
CONTENTS, ALLOC, LOAD, DATA
5 .reloc 0000765c 67ef3000 67ef3000 0002f400 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .debug_aranges 00000560 67efb000 67efb000 00036c00 2**0
CONTENTS, READONLY, DEBUGGING
7 .debug_pubnames 00001112 67efc000 67efc000 00037200 2**0
CONTENTS, READONLY, DEBUGGING
8 .debug_pubtypes 00000f49 67efe000 67efe000 00038400 2**0
CONTENTS, READONLY, DEBUGGING
9 .debug_info 00048851 67eff000 67eff000 00039400 2**0
CONTENTS, READONLY, DEBUGGING
10 .debug_abbrev 000050a3 67f48000 67f48000 00081e00 2**0
CONTENTS, READONLY, DEBUGGING
11 .debug_line 000078a3 67f4e000 67f4e000 00087000 2**0
CONTENTS, READONLY, DEBUGGING
12 .debug_frame 00002114 67f56000 67f56000 0008ea00 2**2
CONTENTS, READONLY, DEBUGGING
13 .debug_str 00000664 67f59000 67f59000 00090c00 2**0
CONTENTS, READONLY, DEBUGGING
14 .debug_loc 000170a4 67f5a000 67f5a000 00091400 2**0
CONTENTS, READONLY, DEBUGGING
15 .debug_ranges 0000f3a0 67f72000 67f72000 000a8600 2**0
CONTENTS, READONLY, DEBUGGING
Stripped
$ objdump.exe -h strip/dict_snowball.dll
strip/dict_snowball.dll: file format pei-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00016808 67ec1000 67ec1000 00000400 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
1 .data 00017180 67ed8000 67ed8000 00016e00 2**5
CONTENTS, ALLOC, LOAD, DATA
2 .bss 000000f8 67ef0000 67ef0000 00000000 2**5
ALLOC
3 .edata 00000fe0 67ef1000 67ef1000 0002e000 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .idata 000003e0 67ef2000 67ef2000 0002f000 2**2
CONTENTS, ALLOC, LOAD, DATA
5 .reloc 0000765c 67ef3000 67ef3000 0002f400 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
for what I can see a dll with debug symbols
should have a .gnu_debuglink sections:
$ objdump -h /usr/bin/cygmpi-0.dll
/usr/bin/cygmpi-0.dll: file format pei-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00181a28 5e1d1000 5e1d1000 00000400 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
1 .data 00035a40 5e353000 5e353000 00182000 2**5
CONTENTS, ALLOC, LOAD, DATA
2 .rdata 00008460 5e389000 5e389000 001b7c00 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .eh_frame 000250b8 5e392000 5e392000 001c0200 2**2
CONTENTS, ALLOC, LOAD, DATA
4 .bss 0008cd98 5e3b8000 5e3b8000 00000000 2**5
ALLOC
5 .edata 000214b4 5e445000 5e445000 001e5400 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .idata 00002adc 5e467000 5e467000 00206a00 2**2
CONTENTS, ALLOC, LOAD, DATA
7 .reloc 0001459c 5e46a000 5e46a000 00209600 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
8 .gnu_debuglink 00000018 5e47f000 5e47f000 0021dc00 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
Marco
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