Hi Eli, This is what I get (obviously odd-looking string): (gdb) frame 9 #9 0x0000000000624397 in Fread_from_string (string=54138084, start=0, end=0) at lread.c:2075 2075 ret = read_internal_start (string, start, end); (gdb) p string $15 = 54138084 (gdb) xstring $16 = (struct Lisp_String *) 0x33a14e0 "(nilory is relative, it is com" Looks like the 'nil' argument in '(string-match-p "." nil)' somehow did this? (BTW this debug session is on the 2f67f8a commit of master (very recent, today). But the bug is present on emacs-25 too.) On Tue, Jul 12, 2016 at 9:14 AM Eli Zaretskii wrote: > In this frame, please show the value of 'string', like this: > > (gdb) frame 9 > (gdb) p string > (gdb) xstring > -- -- Kaushal Modi