I asked Miklos (initial author of that code) and he clarified quickly: the
reason for `-1` is to get rid of the byte of the field `unsigned char vars[1]`
from the `struct _cfg_block`.
He spotted that sizeof(cfg_block_t) is 8 on your system, while it should be 9:
```
/*! \brief single memoy block that contains all the cfg values */
typedef struct _cfg_block {
atomic_t refcnt; /*!< reference counter,
the block is automatically deleted
when it reaches 0 */
int _pad; /*!< force 8 byte alignment */
unsigned char vars[1]; /*!< blob that contains the values */
} cfg_block_t;
```
What version of kamailio are you using? Compiled by yourself or from packages
built by the project? Also, what is the operating system and kernel (uname -a)
versions?
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