I was trying to port my program which was using libcli_smb from Samba 4 alpha 1 release to alpha 2 but it crashes every time after lp_load() call. Here is the simplest version for testing and backtrace.

/* main.c - begin */
#include "includes.h"
#include "param/param.h"
#include "param/proto.h"
#include "ldb.h"
#include "dynconfig.h"

int main (int argc, char *argv[])
{
        struct loadparm_context *lp_ctx;

        fault_setup(argv[0]);
        global_loadparm = lp_ctx = loadparm_init(talloc_autofree_context());

        if (getenv("SMB_CONF_PATH"))
                lp_load(lp_ctx, getenv("SMB_CONF_PATH"));
        else
                lp_load(lp_ctx, dyn_CONFIGFILE);

        return 0;
}
/* main.c - end */

PANIC: internal error
BACKTRACE: 10 stack frames:
 #0 /usr/lib/libcli_smb.so.0(call_backtrace+0x2d) [0xb7eb06b7]
 #1 /usr/lib/libcli_smb.so.0(smb_panic+0x6e) [0xb7eb07d4]
 #2 /usr/lib/libcli_smb.so.0 [0xb7eb0a92]
 #3 [0xb7f4c420]
 #4 /usr/lib/libcli_smb.so.0(lp_parm_bool+0x38) [0xb7eaeb91]
 #5 /usr/lib/libcli_smb.so.0(smb_iconv_convenience_init_lp+0x43) [0xb7eaf995]
 #6 /usr/lib/libcli_smb.so.0(reload_charcnv+0x3d) [0xb7eafa1c]
 #7 /usr/lib/libcli_smb.so.0(lp_load+0x12b) [0xb7eae8bf]
 #8 ./smbclitest [0x80485e8]
 #9 /lib/libc.so.6(__libc_start_main+0xe3) [0xb7b1c3d3]