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infinite loop in terminal mode when catting a small perl script


From: John Palkovic
Subject: infinite loop in terminal mode when catting a small perl script
Date: 12 Jun 2002 14:56:38 -0000

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
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and to the gnu.emacs.bug news group.

In GNU Emacs 21.2.1 (i686-pc-linux-gnu, X toolkit)
 of 2002-05-22 on coredump
configured using `configure  --prefix=/usr/local/stow/emacs-21.2'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

My home directory is mounted via NFS from this FreeBSD system:

meson:~> uname -a
FreeBSD meson.pcqt.com 4.6-RC FreeBSD 4.6-RC #0: Thu Jun  6 14:36:08 CDT 2002   
  address@hidden:/usr/obj/usr/src/sys/MESON  i386

In my home directory is a small perl script name "q.pl". Here it is:

  #!/usr/bin/perl

  while(<>)
  {
      if ($. == 1) {print "//\n//\t\$Id\$\n//\n";}
      print;
  }

If I do a M-x term<ret> to get a bash shell and then cd to my homedir
and issue the command 'cat q.pl' emacs (apparently) goes into an
infinite loop. I stopped emacs in gdb and generated the following
backtrace:

(gdb) bt
#0  gc_sweep () at /u/palkovic/bld/emacs-21.2/src/alloc.c:4921
#1  0x081114b7 in Fgarbage_collect () at 
/u/palkovic/bld/emacs-21.2/src/alloc.c:4189
#2  0x08122dd2 in Ffuncall (nargs=2, args=0xbfffe714)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:2599
#3  0x0814948c in Fbyte_code (bytestr=942338516, vector=1214026240, maxdepth=6)
    at /u/palkovic/bld/emacs-21.2/src/bytecode.c:716
#4  0x08123547 in funcall_lambda (fun=1214026856, nargs=2, 
arg_vector=0xbfffe838)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:2851
#5  0x081230b1 in Ffuncall (nargs=3, args=0xbfffe834)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:2716
#6  0x08122995 in Fapply (nargs=2, args=0xbfffe8b4)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:2169
#7  0x08122c91 in apply1 (fn=406221612, arg=1482604740)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:2423
#8  0x0814d7e7 in read_process_output_call (fun_and_args=1482604748)
    at /u/palkovic/bld/emacs-21.2/src/process.c:2872
#9  0x081215f4 in internal_condition_case_1 (
    bfun=0x814d7cc <read_process_output_call>, arg=1482604748, 
handlers=405291324, 
    hfun=0x814d7ec <read_process_output_error_handler>)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:1307
#10 0x0814db25 in read_process_output (proc=1212441136, channel=4)
    at /u/palkovic/bld/emacs-21.2/src/process.c:3053
#11 0x0814d668 in wait_reading_process_input (time_limit=30, microsecs=0, 
    read_kbd=268435455, do_display=1)
    at /u/palkovic/bld/emacs-21.2/src/process.c:2774
#12 0x08056ab3 in sit_for (sec=30, usec=0, reading=1, display=1, 
initial_display=0)
    at /u/palkovic/bld/emacs-21.2/src/dispnew.c:6247
#13 0x080d1ff3 in read_char (commandflag=1, nmaps=2, maps=0xbffff184, 
    prev_event=405195004, used_mouse_menu=0xbffff1cc)
    at /u/palkovic/bld/emacs-21.2/src/keyboard.c:2491
#14 0x080d84e3 in read_key_sequence (keybuf=0xbffff2d4, bufsize=30, 
    prompt=405195004, dont_downcase_last=0, can_return_switch_frame=1, 
    fix_current_buffer=1) at /u/palkovic/bld/emacs-21.2/src/keyboard.c:8180
#15 0x080d06c4 in command_loop_1 ()
    at /u/palkovic/bld/emacs-21.2/src/keyboard.c:1440
#16 0x081214f9 in internal_condition_case (bfun=0x80d03d0 <command_loop_1>, 
    handlers=405291324, hfun=0x80d0014 <cmd_error>)
    at /u/palkovic/bld/emacs-21.2/src/eval.c:1267
#17 0x080d02a8 in command_loop_2 ()
    at /u/palkovic/bld/emacs-21.2/src/keyboard.c:1245
#18 0x0812108d in internal_catch (tag=405252932, func=0x80d0284 
<command_loop_2>, 
    arg=405195004) at /u/palkovic/bld/emacs-21.2/src/eval.c:1030
#19 0x080d0257 in command_loop () at 
/u/palkovic/bld/emacs-21.2/src/keyboard.c:1224
#20 0x080cfdd1 in recursive_edit_1 ()
    at /u/palkovic/bld/emacs-21.2/src/keyboard.c:950
#21 0x080cff00 in Frecursive_edit ()
    at /u/palkovic/bld/emacs-21.2/src/keyboard.c:1006
#22 0x080cee6f in main (argc=3, argv=0xbffff894, envp=0xbffff8a4)
    at /u/palkovic/bld/emacs-21.2/src/emacs.c:1547
#23 0x402ff17f in __libc_start_main () from /lib/libc.so.6

If I put an strace on the looping emacs I see that it is
looping. 'top' shows emacs using 95% of the cpu (this is a 1 GHz
PIII). The strace output is at ftp://ftp.enteract.com/users/lepton/s.




Recent input:
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-p <return> 
C-x 1 u C-x C-f C-a C-k / u / b l <tab> <backspace> 
<backspace> p a <tab> b l <tab> e m <tab> e t <tab> 
P R <tab> <return> C-s n f s C-s C-s C-s C-a M-< C-s 
f r e e b s d C-s C-s C-s C-s M-< C-x b <return> u 
M-x b u g <tab> <backspace> <backspace> <backspace> 
C-g C-h a b u g <return> <help-echo> q C-x 1 C-x k 
<return> M-x r e p o r t <tab> <return>

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