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bug#1650: 23.0.60; raw-text-dos memory corruption


From: Johan =?UTF-8?Q?Bockg=C3=A5rd
Subject: bug#1650: 23.0.60; raw-text-dos memory corruption
Date: Sat, 20 Dec 2008 16:55:54 +0100
User-agent: Gnus/5.110009 (No Gnus v0.9) Emacs/23.0.60 (gnu/linux)

GNU Emacs 23.0.60.12 (x86_64-unknown-linux-gnu, GTK+ Version 2.14.4) of
2008-12-20

emacs -Q

  ;; dictd is running on port 2628
  (let* ((coding-system-for-read 'raw-text-dos)
         (coding-system-for-write 'raw-text-dos)
         (proc (open-network-stream "foo" "foo" "localhost" 2628)))
    ;; The crash goes away if the next line is uncommented
    ;; (sit-for .1)
    (process-send-string proc "define * \"vice\"\r\n"))

=> Crash (backtrace below)

I can reproduce the crash on Emacs versions after 2008-03-25, whereas I
don't see the problem on versions before 2008-03-02. Intermediate
versions don't crash, but instead hang and consume all memory.


2008-03-25  Stefan Monnier  <address@hidden>

        [...]

        * process.h (struct Lisp_Process): Remove filter_multibyte.
        * process.c (QCfilter_multibyte): Remove.
        (setup_process_coding_systems): Don't use filter_multibyte.
        (Fstart_process, Fmake_network_process): Don't set filter_multibyte.
        (read_process_output): Don't adjust multibyteness to filter_multibyte.
        (Fset_process_filter_multibyte): Change the coding-system to
        approximate the previous behavior.
        (Fprocess_filter_multibyte_p): Get the multibyteness straight from the
        coding-system.

        * coding.c (decode_coding_object): When not decoding into a buffer,
        obey the coding system's preference of (uni|multi)byte.


2008-03-02  Kenichi Handa  <address@hidden>

        * coding.c (decode_coding_utf_8): When eol-type of CODING is
        `dos', don't decode '\r' if that is the last in the source.
        (decode_coding_utf_16, decode_coding_emacs_mule)
        (decode_coding_iso_2022, decode_coding_sjis, decode_coding_big5)
        (decode_coding_raw_text, decode_coding_charset): Likewise.
        (produce_chars): Don't decode EOL here.  Use EMACS_INT.


*** glibc detected *** /home/bojohan/vc/emacs/src/emacs: malloc(): memory 
corruption: 0x00000000022f83e0 ***
======= Backtrace: =========
/lib/libc.so.6[0x7f4f73ed2cff]
/lib/libc.so.6(__libc_malloc+0x98)[0x7f4f73ed4538]
/home/bojohan/vc/emacs/src/emacs[0x5497ce]
[...]

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7f4f78df7770 (LWP 7357)]
0x00007f4f73e88fd5 in raise () from /lib/libc.so.6
(gdb) bt
#0  0x00007f4f73e88fd5 in raise () from /lib/libc.so.6
#1  0x00007f4f73e8ab43 in abort () from /lib/libc.so.6
#2  0x00007f4f73ec9fa8 in ?? () from /lib/libc.so.6
#3  0x00007f4f73ed2cff in ?? () from /lib/libc.so.6
#4  0x00007f4f73ed4538 in malloc () from /lib/libc.so.6
#5  0x00000000005497ce in lisp_malloc (nbytes=7357, type=7357) at alloc.c:861
#6  0x000000000054a09a in allocate_string_data (s=0xdc7510, nchars=8136, 
    nbytes=8136) at alloc.c:1991
#7  0x000000000054ab90 in make_uninit_multibyte_string (nchars=8136, 
    nbytes=8136) at alloc.c:2508
#8  0x000000000054ac87 in make_uninit_string (length=7357) at alloc.c:2486
#9  0x00000000005587fd in make_buffer_string_both (start=1, start_byte=1, 
    end=8137, end_byte=<value optimized out>, props=1) at editfns.c:2420
#10 0x0000000000481c35 in decode_coding_object (coding=0xab4800, 
    src_object=11030241, from=0, from_byte=0, to=<value optimized out>, 
    to_byte=<value optimized out>, dst_object=11030337) at coding.c:7307
#11 0x000000000059bc8e in read_process_output (proc=16927316, channel=153)
    at process.c:5409
#12 0x000000000059f4f1 in wait_reading_process_output (time_limit=30, 
    microsecs=0, read_kbd=-1, do_display=1, wait_for_cell=11030241, 
    wait_proc=0x0, just_wait_proc=0) at process.c:4987
#13 0x0000000000415645 in sit_for (timeout=240, reading=1, do_display=1)
    at dispnew.c:6637
#14 0x00000000004f9f75 in read_char (commandflag=1, nmaps=2, 
    maps=0x7fff80e2ecc0, prev_event=11030241, used_mouse_menu=0x7fff80e2edd4, 
    end_time=0x0) at keyboard.c:2892
#15 0x00000000004fb8dd in read_key_sequence (keybuf=0x7fff80e2ee60, 
    bufsize=30, prompt=11030241, dont_downcase_last=0, 
    can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9343
#16 0x00000000004fd73a in command_loop_1 () at keyboard.c:1621
#17 0x00000000005608cf in internal_condition_case (
    bfun=0x4fd520 <command_loop_1>, handlers=11117457, 
    hfun=0x4f5dd0 <cmd_error>) at eval.c:1511
#18 0x00000000004f524e in command_loop_2 () at keyboard.c:1338
#19 0x00000000005609e7 in internal_catch (tag=<value optimized out>, 
    func=0x4f5230 <command_loop_2>, arg=11030241) at eval.c:1247
#20 0x00000000004f5c10 in command_loop () at keyboard.c:1317
#21 0x00000000004f601c in recursive_edit_1 () at keyboard.c:942
#22 0x00000000004f6194 in Frecursive_edit () at keyboard.c:1004
#23 0x00000000004eb057 in main (argc=2, argv=0x7fff80e2f678) at emacs.c:1786






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