Re: [mdb-dev] Segmentation fault

[Jeff S. <why...@ya...>]

I can see where things start going downhill, but more information would
be helpful.  
  1. are you using mdbtools v0.5, or mdbtools from CVS?
  2. what platform are you using (e.g. Linux on x86)
  3. how was the mdb created (if Access, which version)?

Here is what I can tell you at this point:
> lseek(3, 4096, SEEK_SET)                = 4096
mdbtools has decided this is a JET3 database
> read(3, "\201\310\244w\261*\307\6:\254/\3001@a\210)t\250\201\244"..., 2048) = 2048
This data does not look right compared with other JET3 databases I've seen.
> lseek(3, 3162402816, SEEK_SET)          = -1 EINVAL (Invalid argument)
We are now trying to read 3GB past the end of the file, so omething in that last block
was obviously wrong.

  -- Jeff Smith

--- Hans Christian Studt <hc...@po...> wrote:
> Hi,
> 
> I get Segmentation fault on a mdb file.
> I have included the short strace output.
> Does anybody have a guess what goes wrong ?
>
...
> 
> stat64("mgh-base.mdb", {st_mode=S_IFREG|0755, st_size=1908736, ...}) = 0
> open("mgh-base.mdb", O_RDONLY)          = 3
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1908736, ...}) = 0
> lseek(3, 0, SEEK_SET)                   = 0
> read(3, "\0\1\0\0Standard Jet DB\0\0\0\0\0\265n\3b`\t\302U"..., 2048) = 2048
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1908736, ...}) = 0
> lseek(3, 4096, SEEK_SET)                = 4096
> read(3, "\201\310\244w\261*\307\6:\254/\3001@a\210)t\250\201\244"..., 2048) = 2048
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1908736, ...}) = 0
> lseek(3, 3162402816, SEEK_SET)          = -1 EINVAL (Invalid argument)
> read(3, "\f,\2777\362D\357e\314\365\265\352]R\236\0003s`\224\36"..., 2048) = 2048
> mmap2(NULL, 4294938624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1
> EINVAL (Invalid argument)
> mmap2(NULL, 2097152, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) =
> 0xf6e1b000
> munmap(0xf6e1b000, 937984)              = 0
> munmap(0xf7000000, 110592)              = 0
> mprotect(0xf6f00000, 102400, PROT_READ|PROT_WRITE) = 0
> mmap2(NULL, 4294938624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1
> EINVAL (Invalid argument)
> mmap2(NULL, 2097152, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) =
> 0xf6d00000
> munmap(0xf6d00000, 0)                   = -1 EINVAL (Invalid argument)
> munmap(0xf6e00000, 1048576)             = 0
> mprotect(0xf6d00000, 102400, PROT_READ|PROT_WRITE) = 0
> munmap(0xf6d00000, 1048576)             = 0
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++
> Mon Jun 07 20:29:44 (hcs)@(tux1700)on(pts/19):



	
		
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