Re: 23.0.60; detect attached file coding system, make emacs crash.

[Stefan Monnier]

Please don't send to both the emacs-devel mailing list and the
emacs-pretest-bug bug-tracker.
This creates havoc in the bug-tracker.


        Stefan


> detect attached file coding system with following code, make emacs crash

> (with-temp-buffer
>     (insert-file-contents "/home/dcwang/1.txt")
>     (detect-coding-region (point-min) (point-max) t))


> bt full (top 10 frames):

> #0  detect_coding_utf_16 (coding=0xbfed10b0, detect_info=0xbfed11a0) at 
> coding.c:1622
>         e = '\0' <repeats 45 times>, "\001", '\0' <repeats 56 times>, 
> "\001\000\000\001\000\000\000\000\000\000\000\000\001\000\001", '\0' <repeats 
> 138 times>
>         o = '\0' <repeats 45 times>, "\001", '\0' <repeats 56 times>, 
> "\001\000\000\001\000\000\000\000\001\000\000\000\001\000\001", '\0' <repeats 
> 138 times>
>         e_num = 5
>         o_num = 7
>         src = (
>     const unsigned char *) 0x8d78fe9 
> "\ninfo-title=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-album=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-tracknumber=1\ninfo-year=0\ninfo-genre=*\340\245\213\ninfo-note=\ninfo-playing-time=1379\n"
>         src_end = (const unsigned char *) 0x8d79079 ""
>         multibytep = 1
>         c1 = -2406
>         c2 = -1572940
> #1  0x080b29bc in detect_coding_system (
>     src=0x8d78fd0 
> "info-artist=\340\244\222\340\244\244\340\245\246\366\200\201\214\ninfo-title=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-album=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-tracknumber=1\ninfo-year=0\ninfo-genre=*\340\245\213\ninfo-note=\ninfo-playing-time=1379\n",
>     src_chars=136, src_bytes=169, highest=1, multibytep=1, 
> coding_system=137943241) at coding.c:7847
>         category = <value optimized out>
>         this = (struct coding_system *) 0x8345f30
>         c = <value optimized out>
>         i = 12
>         src_end = (const unsigned char *) 0x8d79079 ""
>         attrs = <value optimized out>
>         eol_type = 138073060
>         val = 137943241
>         coding = {
>   id = 4,
>   common_flags = 5120,
>   mode = 2,
>   spec = {
>     iso_2022 = {
>       flags = 135436798,
>       current_invocation = {-1, 169},
>       current_designation = {136, 136, 136, 0},
>       single_shifting = -1074982680,
>       bol = 0
>     },
>     ccl = 0x81299fe,
>     utf_16 = {
>       bom = 135436798,
>       endian = 4294967295,
>       surrogate = 169
>     },
>     utf_8_bom = 135436798,
>     emacs_mule_full_support = 135436798
>   },
>   max_charset_id = 0,
>   safe_charsets = 0x838faec "",
>   src_multibyte = 1,
>   dst_multibyte = 0,
>   head_ascii = 12,
>   produced = 148344260,
>   produced_char = 148346784,
>   consumed = 0,
>   consumed_char = 1,
>   errors = 2136,
>   error_positions = 0x8d78dc4,
>  result = CODING_RESULT_INVALID_SRC,
>   src_pos = 0,
>   src_pos_byte = -1075130800,
>   src_chars = 136,
>   src_bytes = 169,
>   src_object = 1,
>   source = 0x8d78fd0 
> "info-artist=\340\244\222\340\244\244\340\245\246\366\200\201\214\ninfo-title=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-album=\340\244\222\340\244\244\340\245\246\366\200\201\214900\340\245\213\ninfo-tracknumber=1\ninfo-year=0\ninfo-genre=*\340\245\213\ninfo-note=\ninfo-playing-time=1379\n",
>   dst_pos = 14525,
>   dst_pos_byte = 0,
>   dst_bytes = 29,
>   dst_object = 0,
>   destination = 0x1 <Address 0x1 out of bounds>,
>   chars_at_source = 0,
>   charbuf = 0x83bb0e9,
>   charbuf_size = 1376529752,
>   charbuf_used = 1511,
>   annotated = 149,
>   carryover = 
> "+\320\327\b(\320\327\b\371\3308\bx\021\355\277R\f\030\b\371\3308\b 
> \000\000\000p\202\n\b\340\276\n\b\004\000\000\000\371\3308\b\370\021\355\277X!\031\b\371\3308\b\244\201\000\000\001\000\000",
>   carryover_bytes = 1000,
>   default_char = 0,
>   detector = 0,
>   decoder = 0x80a7640 <decode_coding_raw_text>,
>   encoder = 0x80b78b0 <encode_coding_raw_text>
> }
>         id = <value optimized out>
>         detect_info = {
>   checked = 294911,
>   found = 0,
>   rejected = 3328
> }
>         null_byte_found = 0
>         eight_bit_found = <value optimized out>
> #2  0x080b2dfc in Fdetect_coding_region (start=8, end=1096, 
> highest=137943289) at coding.c:8058
>         from = 1
>         to = 137
>         from_byte = 1
>         to_byte = 169
> #3  0x081923c4 in Feval (form=148944845) at eval.c:2381
>         numargs = <value optimized out>
>         argvals = {8, 1096, 137943289, 137943241, 137943241, 148361211, 7, 7}
>         args_left = 137943241
>         i = 3
>         fun = <value optimized out>
>         val = <value optimized out>
>         original_fun = <value optimized out>
>         original_args = 148944861
>         funcar = <value optimized out>
>         backtrace = {
>   next = 0xbfed12e0,
>   function = 0xbfed1268,
>   args = 0xbfed1230,
>   nargs = 3,
>   evalargs = 1 '\001',
>   debug_on_exit = 0 '\0'
> }
> #4  0x0819268f in Fprogn (args=4) at eval.c:449
>         val = -1074982824
> #5  0x0819249b in Feval (form=148942909) at eval.c:2322
>         numargs = 4
>         argvals = {2, 138158929, -1074982168, 135793746, 138157906, 
> 148943085, 4, 1}
>         args_left = 148942885
>         i = <value optimized out>
>         fun = <value optimized out>
>         val = <value optimized out>
>         original_fun = <value optimized out>
>         original_args = 148942885
>         funcar = <value optimized out>
>         backtrace = {
>   next = 0xbfed1380,
>   function = 0xbfed12f8,
>   args = 0xbfed12f4,
>   nargs = -1,
>   evalargs = 0 '\0',
>   debug_on_exit = 0 '\0'
> }
> #6  0x08192ad2 in Funwind_protect (args=148942981) at eval.c:1353
>         val = <value optimized out>
> #7  0x0819249b in Feval (form=148942989) at eval.c:2322
>         numargs = 4
>         argvals = {148344260, 136426564, 10, 145607856, 4, 0, 1, 136426564}
>         args_left = 148942981
>         i = <value optimized out>
>         fun = <value optimized out>
>         val = <value optimized out>
>         original_fun = <value optimized out>
>         original_args = 148942981
>         funcar = <value optimized out>
>         backtrace = {
>   next = 0xbfed1430,
>   function = 0xbfed1398,
>   args = 0xbfed1394,
>   nargs = -1,
>   evalargs = 0 '\0',
>   debug_on_exit = 0 '\0'
> }
> #8  0x0819268f in Fprogn (args=4) at eval.c:449
>         val = -1074982824
> #9  0x08185b86 in Fsave_current_buffer (args=148943085) at editfns.c:1023
>         val = <value optimized out>
> #10 0x0819249b in Feval (form=148943093) at eval.c:2322
>         numargs = 4
>         argvals = {136426564, 148663201, 148942989, 135863493, 148943005, 
> 148942901, 148943013, 148663201}
>         args_left = 148943085
>         i = <value optimized out>
>         fun = <value optimized out>
>         val = <value optimized out>
>         original_fun = <value optimized out>
>         original_args = 148943085
>         funcar = <value optimized out>
>         backtrace = {
>   next = 0xbfed14b0,
>   function = 0xbfed1448,
>   args = 0xbfed1444,
>   nargs = -1,
>   evalargs = 0 '\0',
>   debug_on_exit = 0 '\0'
> }

> xbacktrace:

> "detect-coding-region" (0xbfed1230)
> "progn" (0xbfed12f4)
> "unwind-protect" (0xbfed1394)
> "save-current-buffer" (0xbfed1444)
> "with-current-buffer" (0xbfed14c4)
> "let" (0xbfed15a4)
> "with-temp-buffer" (0xbfed1624)
> "eval" (0xbfed16c8)
> "eval-last-sexp-1" (0xbfed17f4)
> "eval-last-sexp" (0xbfed1974)
> "call-interactively" (0xbfed1b34)