Re: [Valgrind-developers] backtrace option in valgrind .

[<and...@us...>]

The stack trace explicitly tells you: the main() called libc fgets() which 
called libc getline() which called memcpy which had the invalid write.

Your error is likely that you passed an invalid argument to fgets() from 
main(). Check the arguments you use to fgets on line 22 of gan.c and 
you'll probably find your error.

Andrew


val...@li... wrote on 01/24/2007 
03:35:24 AM:

> [image removed] 
> 
> [Valgrind-developers] backtrace option in valgrind .
> 
> Vikas <cat...@gm...>
> 
> to:
> 
> valgrind-developers
> 
> 01/24/07 04:13 AM
> 
> Bcc:
> 
> Andrew Lamb
> 
> Hi ,
> 
> I get an output like this. 
> 
> ==26775== Invalid write of size 2
> POINT 1 .
> ==26775==    at 0x1B9879DA: memcpy (in /lib/tls/i686/cmov/libc-2.3.6.so)
> ==26775==    by 0x1B970FEE: _IO_getline (in /lib/tls/i686/cmov/libc- 
2.3.6.so)
> ==26775==    by 0x1B96FF18: _IO_fgets (in 
/lib/tls/i686/cmov/libc-2.3.6.so)
> ==26775==    by 0x80484CD: main (gan.c:22)
> ==26775==  Address 0x1BA4E029 is 1 bytes inside a block of size 2 free'd 

> ==26775==    at 0x1B9070B9: free (vg_replace_malloc.c:153)
> ==26775==    by 0x804848F: main (gan.c:13)
> 
> 
> Is there any way to know what function was called before memcpy 
> which is below POINT1 ???
> 
> Waiting for reply. 
> vikas
> 
> 
> 
> 
> 
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