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bug#84: Acknowledgement (23.0.60; Occasional hangs in flyspell-mode and


From: Markus Triska
Subject: bug#84: Acknowledgement (23.0.60; Occasional hangs in flyspell-mode and ispell-word)
Date: Wed, 09 Jul 2008 11:57:46 +0200

> of aspell, and then start Gnus a few times. This almost always makes
> Emacs hang completely; I'm now trying to make this test case shorter.

I now have a precise test case that makes Emacs totally hang on my
machine every time:

(1) With M-:, I evaluate the following forms in "emacs -Q":

   (defmacro preserve-message (form)
     `(let ((msg (current-message)))
        ,form
        (message "%s" msg)))

   (let ((n 0))
     (while (< n 10)
       (with-timeout (1 (setq n (1+ n)) (message "# timeouts: %s" n))
         (condition-case err
             (with-temp-buffer
               (insert "test")
               (preserve-message
                (ispell-word nil t)))
           (error (message "error: %s" err))))))

(2) In a separate terminal, I continuously kill the aspell process:

    while true; do killall -9 aspell; sleep 0.1; done

(3) I wait until the timeout counter has reached 10, i.e., evaluation
    of the second form above is finished, then I evaluate the forms:

   (defun reactivate-flyspell ()
     (unless (memq 'flyspell-post-command-hook post-command-hook)
       (preserve-message
        (flyspell-mode 1))))

   (setq my-idle (run-with-idle-timer 0.1 t 'reactivate-flyspell))

(4) Then I enter and exit Gnus three times:

    M-x gnus RET q y
    M-x gnus RET q y
    M-x gnus RET q y

    all while aspell is constantly killed and restarted in the
    background. Starting Gnus only once does not suffice.

(5) I kill the shell script, so aspell can now run interruptedly. I
    enter and try to exit Gnus again:

    M-x gnus RET q y

    and Emacs hangs completely. I cannot interrupt it with C-g. The
    backtrace follows.

This is with GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version
2.12.9) of 2008-06-29; I will try to reproduce it with different
machines later. You may have to adjust the sleep time in the shell
command to kill the aspell process not too often.


   #0  0x9000177e in __error ()
   #1  0x9000172b in cthread_set_errno_self ()
   #2  0x9011078b in cerror ()
   #3  0x00181918 in read_process_output (proc=42226388, channel=0) at 
process.c:5322
   #4  0x00188134 in wait_reading_process_output (time_limit=0, microsecs=0, 
read_kbd=0, do_display=0, wait_for_cell=58721289, wait_proc=0x28452d0, 
just_wait_proc=0) at process.c:4772
   #5  0x00188f38 in Faccept_process_output (process=42226388, 
seconds=58721289, millisec=58721289, just_this_one=58721289) at process.c:4252
   #6  0x00144ac4 in Ffuncall (nargs=2, args=0xbfffec60) at eval.c:3052
   #7  0x0017dc57 in Fbyte_code (bytestr=58983403, vector=35024692, maxdepth=2) 
at bytecode.c:678
   #8  0x00143f72 in Feval (form=40259517) at eval.c:2383
   #9  0x0014655b in internal_lisp_condition_case (var=58721289, 
bodyform=40259517, handlers=40289301) at eval.c:1456
   #10 0x0017cb8d in Fbyte_code (bytestr=58985659, vector=35024820, maxdepth=5) 
at bytecode.c:868
   #11 0x001443a7 in funcall_lambda (fun=35025140, nargs=0, 
arg_vector=0xbffff014) at eval.c:3229
   #12 0x0014488a in Ffuncall (nargs=1, args=0xbffff010) at eval.c:3099
   #13 0x0017dc57 in Fbyte_code (bytestr=58738651, vector=35023668, maxdepth=4) 
at bytecode.c:678
   #14 0x001443a7 in funcall_lambda (fun=35023860, nargs=0, 
arg_vector=0xbffff1f0) at eval.c:3229
   #15 0x0014488a in Ffuncall (nargs=1, args=0xbffff1ec) at eval.c:3099
   #16 0x00145e14 in run_hook_with_args (nargs=1, args=0xbffff1ec, 
cond=to_completion) at eval.c:2701
   #17 0x00145f9c in Frun_hooks (nargs=1, args=0xbffff2a4) at eval.c:2564
   #18 0x00144a2f in Ffuncall (nargs=2, args=0xbffff2a0) at eval.c:3023
   #19 0x00145c9f in call1 (fn=58809001, arg1=58751489) at eval.c:2827
   #20 0x000d6434 in safe_run_hooks_1 (hook=-1073745176) at keyboard.c:2152
   #21 0x00142c1c in internal_condition_case (bfun=0xd6402 <safe_run_hooks_1>, 
handlers=58721337, hfun=0xd643e <safe_run_hooks_error>) at eval.c:1511
   #22 0x000d5ac5 in safe_run_hooks (hook=58751489) at keyboard.c:2180
   #23 0x000e3d46 in command_loop_1 () at keyboard.c:1929
   #24 0x00142c1c in internal_condition_case (bfun=0xe387e <command_loop_1>, 
handlers=58760929, hfun=0xdc6d9 <cmd_error>) at eval.c:1511
   #25 0x000d5830 in command_loop_2 () at keyboard.c:1367
   #26 0x0014286e in internal_catch (tag=58757001, func=0xd57ec 
<command_loop_2>, arg=58721289) at eval.c:1247
   #27 0x000d55d2 in command_loop () at keyboard.c:1346
   #28 0x000d568b in recursive_edit_1 () at keyboard.c:955
   #29 0x000d57d3 in Frecursive_edit () at keyboard.c:1017
   #30 0x000d4813 in main (argc=3, argv=0xbffff820) at emacs.c:1762
    
   (gdb) bt full
   #0  0x9000177e in __error ()
   No symbol table info available.
   #1  0x9000172b in cthread_set_errno_self ()
   No symbol table info available.
   #2  0x9011078b in cerror ()
   No symbol table info available.
   #3  0x00181918 in read_process_output (proc=42226388, channel=0) at 
process.c:5322
           nbytes = -1
           outstream = 0
           old = (struct buffer *) 0x21872d0
           p = (struct Lisp_Process *) 0x28452d0
           opoint = 0
           coding = (struct coding_system *) 0x284f040
           carryover = 3289392
   #4  0x00188134 in wait_reading_process_output (time_limit=0, microsecs=0, 
read_kbd=0, do_display=0, wait_for_cell=58721289, wait_proc=0x28452d0, 
just_wait_proc=0) at process.c:4772
           nread = -1610559488
           total_nread = 0
           timeout_reduced_for_timers = 0
           channel = -1146
           nfds = -1
           Available = {
     fds_bits = {0 <repeats 32 times>}
   }
           Connecting = {
     fds_bits = {0 <repeats 32 times>}
   }
           check_connect = 0
           check_delay = 0
           no_avail = 1
           xerrno = 134678021
           proc = 42226388
           timeout = {
     tv_sec = 100000, 
     tv_usec = 0
   }
           end_time = {
     tv_sec = -1879027210, 
     tv_usec = 13
   }
           wait_channel = 0
           got_some_input = 0
   #5  0x00188f38 in Faccept_process_output (process=42226388, 
seconds=58721289, millisec=58721289, just_this_one=58721289) at process.c:4252
           secs = 0
           usecs = 0
           process = 42226388
           seconds = -1879042283
           millisec = 0
   #6  0x00144ac4 in Ffuncall (nargs=2, args=0xbfffec60) at eval.c:3052
           fun = -1073746976
           original_fun = 3069896
           funcar = -1879042283
           numargs = 1
           val = -1879042184
           backtrace = {
     next = 0xbfffed74, 
     function = 0xbfffec60, 
     args = 0xbfffec64, 
     nargs = 1, 
     evalargs = 0 '\0', 
     debug_on_exit = 0 '\0'
   }
           internal_args = (Lisp_Object *) 0xbfffebe0
           i = -1879042283
           args = (Lisp_Object *) 0x2ed7c8
   #7  0x0017dc57 in Fbyte_code (bytestr=58983403, vector=35024692, maxdepth=2) 
at bytecode.c:678
           op = -1610559488
           vectorp = (Lisp_Object *) 0x2166f38
           stack = {
     pc = 0x5992b35 "address@hidden", 
     top = 0xbfffec64, 
     bottom = 0xbfffec60, 
     byte_string = 58983403, 
     byte_string_start = 0x5992b30 "address@hidden", 
     constants = 35024692, 
     next = 0xbfffef04
   }
           result = -1879042184
           bytestr = -1879042283
   #8  0x00143f72 in Feval (form=40259517) at eval.c:2383
           numargs = -1879042283
           argvals = {58983403, 35024692, 16, 1, 0, 1026674, 1323343, 58983451}
           args_left = 58721289
           i = 3
           fun = -1879042184
           val = -1879042184
           original_fun = 58832137
           original_args = 40259525
           funcar = -1879042283
           backtrace = {
     next = 0xbfffefcc, 
     function = 0xbfffed8c, 
     args = 0xbfffed54, 
     nargs = 3, 
     evalargs = 1 '\001', 
     debug_on_exit = 0 '\0'
   }
           form = 58721289
   #9  0x0014655b in internal_lisp_condition_case (var=58721289, 
bodyform=40259517, handlers=40289301) at eval.c:1456
           val = -1879042283
           c = {
     tag = 58721289, 
     val = 58721289, 
     next = 0xbffff2d8, 
     gcpro = 0x0, 
     jmp = {895, 1569345, 8096, 1336252, 3, 1328852, 93923673, 58721289, 
-1073746328, -1073746512, 42205215, 658, 1336418, 95813655, 58720287, 31, 
-1073807360, 55}, 
     backlist = 0xbfffefcc, 
     handlerlist = 0xbffff34c, 
     lisp_eval_depth = 3, 
     pdlcount = 14, 
     poll_suppress_count = 1, 
     interrupt_input_blocked = 0, 
     byte_stack = 0xbfffef04
   }
           h = {
     handler = 40289301, 
     var = 58721289, 
     chosen_clause = -1073746300, 
     tag = 0xbfffedc8, 
     next = 0xbffff34c
   }
   #10 0x0017cb8d in Fbyte_code (bytestr=58985659, vector=35024820, maxdepth=5) 
at bytecode.c:868
           handlers = -1610559488
           body = -1879042283
           op = -1610559488
           vectorp = (Lisp_Object *) 0x2166fb8
           stack = {
     pc = 0x5992959 "?\016&A?\026&??", 
     top = 0xbfffee80, 
     bottom = 0xbfffee80, 
     byte_string = 58985659, 
     byte_string_start = 0x599286c "? ??? 
?`\030?\t!\032ɉ\033\034ɉ\035\036%?\036&\n?=?,", 
     constants = 35024820, 
     next = 0xbffff084
   }
           result = -1879042184
           bytestr = -1879042283
   #11 0x001443a7 in funcall_lambda (fun=35025140, nargs=0, 
arg_vector=0xbffff014) at eval.c:3229
           val = -1610559488
           syms_left = 35025136
           next = 35025136
           i = 0
           optional = 1
           rest = 0
   #12 0x0014488a in Ffuncall (nargs=1, args=0xbffff010) at eval.c:3099
           fun = 35025140
           original_fun = 94138233
           funcar = -1879042283
           numargs = 0
           val = -1879042184
           backtrace = {
     next = 0xbffff14c, 
     function = 0xbffff010, 
     args = 0xbffff014, 
     nargs = 0, 
     evalargs = 0 '\0', 
     debug_on_exit = 0 '\0'
   }
           internal_args = (Lisp_Object *) 0x21670f4
           i = -1879042283
           args = (Lisp_Object *) 0x59c6f79
   #13 0x0017dc57 in Fbyte_code (bytestr=58738651, vector=35023668, maxdepth=4) 
at bytecode.c:678
           op = -1610559488
           vectorp = (Lisp_Object *) 0x2166b38
           stack = {
     pc = 0x59926b4 "?p\025`\026\017?;", 
     top = 0xbffff010, 
     bottom = 0xbffff010, 
     byte_string = 58738651, 
     byte_string_start = 0x5992698 "\b?\031\032? ?\025", 
     constants = 35023668, 
     next = 0x0
   }
           result = -1879042184
           bytestr = -1879042283
   #14 0x001443a7 in funcall_lambda (fun=35023860, nargs=0, 
arg_vector=0xbffff1f0) at eval.c:3229
           val = -1610559488
           syms_left = 35023856
           next = 35023856
           i = 0
           optional = 2
           rest = 1248273
   #15 0x0014488a in Ffuncall (nargs=1, args=0xbffff1ec) at eval.c:3099
           fun = 35023860
           original_fun = 93950897
           funcar = -1879042283
           numargs = 0
           val = -1879042184
           backtrace = {
     next = 0xbffff24c, 
     function = 0xbffff1ec, 
     args = 0xbffff1f0, 
     nargs = 0, 
     evalargs = 0 '\0', 
     debug_on_exit = 0 '\0'
   }
           internal_args = (Lisp_Object *) 0x2166bf4
           i = -1879042283
           args = (Lisp_Object *) 0x59993b1
   #16 0x00145e14 in run_hook_with_args (nargs=1, args=0xbffff1ec, 
cond=to_completion) at eval.c:2701
           sym = 58751489
           val = -1879042184
           ret = 58721289
           globals = -1879042283
   #17 0x00145f9c in Frun_hooks (nargs=1, args=0xbffff2a4) at eval.c:2564
           hook = {93950897}
           i = 0
           nargs = 1
   #18 0x00144a2f in Ffuncall (nargs=2, args=0xbffff2a0) at eval.c:3023
           fun = 3063148
           original_fun = -1073745244
           funcar = -1879042283
           numargs = 1
           val = -1879042184
           backtrace = {
     next = 0x0, 
     function = 0xbffff2a0, 
     args = 0xbffff2a4, 
     nargs = 1, 
     evalargs = 0 '\0', 
     debug_on_exit = 0 '\0'
   }
           internal_args = (Lisp_Object *) 0x2ebd6c
           i = -1879042283
           args = (Lisp_Object *) 0xbffff2a4
   #19 0x00145c9f in call1 (fn=58809001, arg1=58751489) at eval.c:2827
           ret_ungc_val = -1610559488
   #20 0x000d6434 in safe_run_hooks_1 (hook=-1073745176) at keyboard.c:2152
   No locals.
   #21 0x00142c1c in internal_condition_case (bfun=0xd6402 <safe_run_hooks_1>, 
handlers=58721337, hfun=0xd643e <safe_run_hooks_error>) at eval.c:1511
           val = -1879042283
           c = {
     tag = 58721289, 
     val = 58721289, 
     next = 0xbffff498, 
     gcpro = 0x0, 
     jmp = {895, 1250071, 8096, 1321771, -1073745096, 1250219, 3307312, 2, 
-1073745032, -1073745216, 94961695, 662, 1321920, 1245207, 31, 31, 0, 1310775}, 
     backlist = 0x0, 
     handlerlist = 0xbffff50c, 
     lisp_eval_depth = 0, 
     pdlcount = 3, 
     poll_suppress_count = 1, 
     interrupt_input_blocked = 0, 
     byte_stack = 0x0
   }
           h = {
     handler = 58721337, 
     var = 58721289, 
     chosen_clause = 58807000, 
     tag = 0xbffff2d8, 
     next = 0xbffff50c
   }
   #22 0x000d5ac5 in safe_run_hooks (hook=58751489) at keyboard.c:2180
           hook = -1610559488
   #23 0x000e3d46 in command_loop_1 () at keyboard.c:1929
           cmd = 3284528
           lose = 3284528
           nonundocount = 0
           keybuf = {904, 40, 3307184, 58721289, -1073744776, 903096, 34397045, 
-1073744850, -1073744808, -1879037169, 92274892, 152, -1073744850, 58721289, 
100663439, 1, 31, -1879036413, 51396120, 58721337, 51385976, -1881082098, 
5625428, 0, -1073744804, -1073744992, 0, 3342336, 58721289, 67060025}
           i = 1
           prev_modiff = 138
           prev_buffer = (struct buffer *) 0x284f270
           already_adjusted = 0
   #24 0x00142c1c in internal_condition_case (bfun=0xe387e <command_loop_1>, 
handlers=58760929, hfun=0xdc6d9 <cmd_error>) at eval.c:1511
           val = -1879042283
           c = {
     tag = 58721289, 
     val = 58721289, 
     next = 0xbffff59c, 
     gcpro = 0x0, 
     jmp = {895, 17831856, 8096, 1321771, 58721289, 58721289, 3297712, 3284528, 
-1073744584, -1073744768, 31, 658, 1321920, 1507351, 3276831, 3276831, 
-1073807360, -1073807305}, 
     backlist = 0x0, 
     handlerlist = 0x0, 
     lisp_eval_depth = 0, 
     pdlcount = 2, 
     poll_suppress_count = 1, 
     interrupt_input_blocked = 0, 
     byte_stack = 0x0
   }
           h = {
     handler = 58760929, 
     var = 58721289, 
     chosen_clause = 58721337, 
     tag = 0xbffff498, 
     next = 0x0
   }
   #25 0x000d5830 in command_loop_2 () at keyboard.c:1367
           val = -1610559488
   #26 0x0014286e in internal_catch (tag=58757001, func=0xd57ec 
<command_loop_2>, arg=58721289) at eval.c:1247
           c = {
     tag = 58757001, 
     val = 58721289, 
     next = 0x0, 
     gcpro = 0x0, 
     jmp = {895, 15, 8096, 1320914, 2, 20367, 3306688, 3284528, -1073744360, 
-1073744512, 58851359, 658, 1321057, 58851351, 58851359, 58720287, 51380224, 
55}, 
     backlist = 0x0, 
     handlerlist = 0x0, 
     lisp_eval_depth = 0, 
     pdlcount = 2, 
     poll_suppress_count = 1, 
     interrupt_input_blocked = 0, 
     byte_stack = 0x0
   }
           tag = -1610559488
   #27 0x000d55d2 in command_loop () at keyboard.c:1346
           val = -1610559488
   #28 0x000d568b in recursive_edit_1 () at keyboard.c:955
           val = 0
   #29 0x000d57d3 in Frecursive_edit () at keyboard.c:1017
           buffer = 58721289
   #30 0x000d4813 in main (argc=3, argv=0xbffff820) at emacs.c:1762
           dummy = -1881117246
           stack_bottom_variable = 0 '\0'
           do_initial_setlocale = 1
           skip_args = 0
           rlim = {
     rlim_cur = 8388608, 
     rlim_max = 67108864
   }
           no_loadup = 0
           junk = 0x0









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