Re: git-fast-import crashes

Hi,

On Fri, 12 Oct 2007, Shawn O. Pearce wrote:

Shun Kei Leung [off-list ref] wrote:

quoted

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x64617469
in_window (win=0x5004d0, offset=3501) at sha1_file.c:701
701             off_t win_off = win->offset;

...

quoted

(gdb) print win
$1 = (struct pack_window *) 0x5004d0
(gdb) print *win
$2 = {
  next = 0x64617461,
  base = 0x20333936 <Address 0x20333936 out of bounds>,
  offset = 22523564414626158,
  len = 1685026675,
  last_used = 795894075,
  inuse_cnt = 0
}

Wow.  There's no way that struct pack_window is valid anymore.

[...] 

This looks like it is memory corruption (e.g. someone overwriting a 
free'd segment), but that sort of memory corruption is very hard to 
track down.

I found valgrind invaluable to find such errors.

Ciao,
Dscho