Ah, I've got it! You need a PUSHMARK. You also need to push any args: 
int record( SV *m ) {
    PUSHMARK(SP);
    XPUSHs(m);
    PUTBACK;
    call_sv( g_rec, G_VOID );
    return 0;
}

[download]
call_sv takes everything on the stack back to the last mark as the args for the function call. Even with no args, you need to push a mark.

Dave.

In reply to Re^7: panic: memory wrap by dave_the_m
in thread panic: memory wrap by BrowserUk

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