[STUMP] c-string decoding error (:external-format :UTF-8): the octet sequence 1 cannot be decoded.

[David Hansen]

Got that backtrace (with the backtrace patch that's somewhere
in the moderator queue) after C-t c:

*lisp-version* "SBCL 0.9.17"

c-string decoding error (:external-format :UTF-8):
  the octet sequence 1 cannot be decoded.
0: (SB-DEBUG:BACKTRACE
    536870911
    #<SYNONYM-STREAM :SYMBOL SB-SYS:*STDERR* {90A8C09}>)
1: ((LAMBDA (STUMPWM::ERR)) #<SB-INT:C-STRING-DECODING-ERROR {AF665D1}>)
2: ((LAMBDA (STUMPWM::ERR)) #<SB-INT:C-STRING-DECODING-ERROR {AF665D1}>)
3: (SIGNAL #<SB-INT:C-STRING-DECODING-ERROR {AF665D1}>)
4: (ERROR SB-INT:C-STRING-DECODING-ERROR)
5: (SB-INT:C-STRING-DECODING-ERROR :UTF-8 1)
6: (SB-IMPL::READ-FROM-C-STRING/UTF-8 #.(SB-SYS:INT-SAP #X0A6CCED8) CHARACTER)
7: (SB-INT:C-STRINGS->STRING-LIST
    #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #XBFFFE87C :TYPE (*
                                                            (SB-ALIEN:C-STRING
                                                             :EXTERNAL-FORMAT
                                                             :DEFAULT
                                                             :ELEMENT-TYPE
                                                             CHARACTER))>)
8: (SB-EXT:RUN-PROGRAM
    "/bin/sh"
    ("-c" "xterm")
    :ENV
    NIL
    :ENVIRONMENT
    NIL
    :WAIT
    NIL
    :SEARCH
    NIL
    :PTY
    NIL
    :INPUT
    NIL
    :IF-INPUT-DOES-NOT-EXIST
    NIL
    :OUTPUT
    T
    :IF-OUTPUT-EXISTS
    :ERROR
    :ERROR
    T
    :IF-ERROR-EXISTS
    :ERROR
    :STATUS-HOOK
    NIL)
9: (STUMPWM::PARSE-AND-RUN-COMMAND
    "exec xterm"
    #S(STUMPWM::SCREEN
       :NUMBER #<XLIB:SCREEN :0.0 768x1024x24 TRUE-COLOR>
       :FRAME-TREE #S(STUMPWM::FRAME
                      :NUMBER 0
                      :X 0
                      :Y 0
                      :WIDTH 768
                      :HEIGHT 1024
                      :WINDOW #<XLIB:WINDOW :0 C00013>)
       :BORDER-COLOR "palegreen4"
       :FG-COLOR "palegreen3"
       :BG-COLOR "black"
       :FONT #<XLIB:FONT 
-efont-fixed-bold-r-normal--16-160-75-75-c-80-iso10646-1 :0 14680071>
       :CURRENT-FRAME #S(STUMPWM::FRAME
                         :NUMBER 0
                         :X 0
                         :Y 0
                         :WIDTH 768
                         :HEIGHT 1024
                         :WINDOW #<XLIB:WINDOW :0 C00013>)
       :MAPPED-WINDOWS (#<XLIB:WINDOW :0 C00013> #<XLIB:WINDOW :0 400040>
                        #<XLIB:WINDOW :0 A0000E>)
       :WINDOW-HASH #<HASH-TABLE :TEST EQL :COUNT 3 {A6C4619}>
       :MESSAGE-WINDOW #<XLIB:WINDOW :0 E00004>
       :INPUT-WINDOW #<XLIB:WINDOW :0 E00001>
       :FRAME-WINDOW #<XLIB:WINDOW :0 E00003>
       :FOCUS-WINDOW #<XLIB:WINDOW :0 E00002>
       :MODE-LINE NIL))
10: (STUMPWM::INTERACTIVE-COMMAND
     "exec xterm"
     #S(STUMPWM::SCREEN
        :NUMBER #<XLIB:SCREEN :0.0 768x1024x24 TRUE-COLOR>
        :FRAME-TREE #S(STUMPWM::FRAME
                       :NUMBER 0
                       :X 0
                       :Y 0
                       :WIDTH 768
                       :HEIGHT 1024
                       :WINDOW #<XLIB:WINDOW :0 C00013>)
        :BORDER-COLOR "palegreen4"
        :FG-COLOR "palegreen3"
        :BG-COLOR "black"
        :FONT #<XLIB:FONT 
-efont-fixed-bold-r-normal--16-160-75-75-c-80-iso10646-1 :0 14680071>
        :CURRENT-FRAME #S(STUMPWM::FRAME
                          :NUMBER 0
                          :X 0
                          :Y 0
                          :WIDTH 768
                          :HEIGHT 1024
                          :WINDOW #<XLIB:WINDOW :0 C00013>)
        :MAPPED-WINDOWS (#<XLIB:WINDOW :0 C00013> #<XLIB:WINDOW :0 400040>
                         #<XLIB:WINDOW :0 A0000E>)
        :WINDOW-HASH #<HASH-TABLE :TEST EQL :COUNT 3 {A6C4619}>
        :MESSAGE-WINDOW #<XLIB:WINDOW :0 E00004>
        :INPUT-WINDOW #<XLIB:WINDOW :0 E00001>
        :FRAME-WINDOW #<XLIB:WINDOW :0 E00003>
        :FOCUS-WINDOW #<XLIB:WINDOW :0 E00002>
        :MODE-LINE NIL))
11: (STUMPWM::HANDLE-EVENT
     :DISPLAY
     #<XLIB:DISPLAY :0 (The X.Org Foundation R70101000)>
     :EVENT-KEY
     :KEY-PRESS
     :EVENT-CODE
     2
     :SEND-EVENT-P
     NIL
     :CODE
     28
     :SEQUENCE
     8786
     :TIME
     2086147692
     :ROOT
     #<XLIB:WINDOW :0 119>
     :WINDOW
     #<XLIB:WINDOW :0 C00013>
     :EVENT-WINDOW
     #<XLIB:WINDOW :0 C00013>
     :CHILD
     #<XLIB:WINDOW :0 800F0B>
     :ROOT-X
     749
     :ROOT-Y
     9
     :X
     749
     :Y
     9
     :STATE
     4
     :SAME-SCREEN-P
     T)
12: (XLIB:PROCESS-EVENT
     #<XLIB:DISPLAY :0 (The X.Org Foundation R70101000)>
     :HANDLER
     #<FUNCTION STUMPWM::HANDLE-EVENT>
     :TIMEOUT
     NIL
     :PEEK-P
     NIL
     :DISCARD-P
     NIL
     :FORCE-OUTPUT-P
     T)
13: (STUMPWM::STUMPWM-INTERNAL-LOOP)
14: (STUMPWM:STUMPWM ":0" NIL)
15: ((LAMBDA ()))
16: ("foreign function: call_into_lisp")
17: ("foreign function: funcall0")
18: ("foreign function: new_thread_trampoline")
19: ("foreign function: #xB7FCD0BD")