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bug#11330: 24.1.50; Infloop deleting overlays in the minibuffer

From: Nix
Subject: bug#11330: 24.1.50; Infloop deleting overlays in the minibuffer
Date: Tue, 24 Apr 2012 19:18:35 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

With trunk emacs, I see a hang using the minibuffer after only a few
minutes of use, sometimes less.


"read-from-minibuffer" (0xb4ebdfd8)
"completing-read-default" (0xb4ebe148)
"read-buffer" (0xb4ebe2d8)
"persp-read-buffer" (0xb4ebe4a8)
"call-interactively" (0xb4ebe718)

Note that perspectives.el is not implicated here: control never returns
from delete_all_overlays(), and the value of `overlay' in the
overlays_before loop never changes. Inside Fdelete_overlay(),
Fmarker_buffer (OVERLAY_START (overlay)) is consistently returning Qnil,
so it never actually deletes anything and the deletion loop never

Unfortunately further investigation is stymied by the fact that the
functions in src/.gdbinit still don't work for me, apparently because
I am too stupid to use them. e.g.:

(gdb) xpr overlay
No symbol "Lisp_Int" in current context.

I'll try bisecting for the cause later if nobody can immediately think
of a cause.

C backtrace:

#0  0x0000000000512be0 in Fdelete_overlay (overlay=134171827) at buffer.c:3794
        buffer = <optimized out>
        b = <optimized out>
        count = <optimized out>
#1  0x0000000000513ac9 in delete_all_overlays (b=0x4f118e0) at buffer.c:690
        overlay = <optimized out>
#2  0x0000000000522724 in get_minibuffer (depth=1) at minibuf.c:810
        count = <optimized out>
        tail = <optimized out>
        num = 4
        buf = 82909413
        name = 
#3  0x0000000000522b1f in read_minibuf (map=13237846, initial=11983314, 
prompt=175042689, backup_n=<optimized out>, expflag=0, histvar=12148690, 
histpos=0, defalt=75650225, allow_props=0, inherit_input_method=0) at 
        val = <optimized out>
        count = <optimized out>
        mini_frame = 112612005
        ambient_dir = 92374993
        minibuffer = <optimized out>
        input_method = 11983314
        enable_multibyte = 11983314
        pos = 0
        histstring = <optimized out>
        empty_minibuf = <optimized out>
        dummy = <optimized out>
        frame = <optimized out>
#4  0x0000000000523691 in Fread_from_minibuffer (prompt=175042689, 
initial_contents=11983314, keymap=13237846, read=11983314, hist=12148690, 
default_value=75650225, inherit_input_method=11983314) at minibuf.c:980
        histvar = <optimized out>
        histpos = <optimized out>
        val = <optimized out>
#5  0x00000000005688be in Ffuncall (nargs=<optimized out>, args=0x7fffb4ebdfd0) 
at eval.c:2961
        fun = <optimized out>
        original_fun = <optimized out>
        funcar = <optimized out>
        numargs = <optimized out>
        lisp_numargs = 28
        val = <optimized out>
        backtrace = {next = 0x7fffb4ebe0d0, function = 0x7fffb4ebdfd0, args = 
0x7fffb4ebdfd8, nargs = 7, debug_on_exit = 0}
        internal_args = 0x7fffb4ebdfd8
        i = <optimized out>
#6  0x00000000005a0596 in exec_byte_code (bytestr=<optimized out>, 
vector=<optimized out>, maxdepth=<optimized out>, args_template=<optimized 
out>, nargs=<optimized out>, args=<optimized out>) at bytecode.c:785
        count = 12
        op = <optimized out>
        vectorp = 0x90dd10
        stack = {pc = 0xa8f8f9 "\211˚\203Y", byte_string = 9493729, 
byte_string_start = 0xa8f8b7 "\003:\203\r", constants = 9493765, next = 
        top = 0x7fffb4ebdfd0
        result = <optimized out>
#7  0x000000000056879b in Ffuncall (nargs=9, args=0x7fffb4ebe140) at eval.c:2996
        fun = <optimized out>
        original_fun = 13702850
        funcar = <optimized out>
        numargs = 8
        lisp_numargs = 32
        val = <optimized out>
        backtrace = {next = 0x7fffb4ebe260, function = 0x7fffb4ebe140, args = 
0x7fffb4ebe148, nargs = 8, debug_on_exit = 0}
        internal_args = <optimized out>
        i = <optimized out>
#8  0x0000000000520e42 in Fcompleting_read (prompt=175042689, 
collection=12150338, predicate=11983314, require_match=11983362, 
initial_input=11983314, hist=12148690, def=75650225, 
inherit_input_method=11983314) at minibuf.c:1726
        args = {13702850, 175042689, 12150338, 11983314, 11983362, 11983314, 
12148690, 75650225, 11983314}
#9  0x0000000000521e58 in Fread_buffer (prompt=175042689, def=75650225, 
require_match=11983362) at minibuf.c:1176
        args = {175042721, 175042753, 75650225, 14456544}
        result = <optimized out>
        s = <optimized out>
        len = <optimized out>
        count = 11
#10 0x0000000000568941 in Ffuncall (nargs=<optimized out>, args=0x7fffb4ebe2d0) 
at eval.c:2942
        fun = <optimized out>
        original_fun = <optimized out>
        funcar = <optimized out>
        numargs = <optimized out>
        lisp_numargs = 12
        val = <optimized out>
        backtrace = {next = 0x7fffb4ebe420, function = 0x7fffb4ebe2d0, args = 
0x7fffb4ebe2d8, nargs = 3, debug_on_exit = 0}
        internal_args = 0x7fffb4ebe2d8
        i = <optimized out>
#11 0x00000000005a0596 in exec_byte_code (bytestr=<optimized out>, 
vector=<optimized out>, maxdepth=<optimized out>, args_template=<optimized 
out>, nargs=<optimized out>, args=<optimized out>) at bytecode.c:785
        count = 7
        op = <optimized out>
        vectorp = 0x45d82e0
        stack = {pc = 0x432ca83 "+)\207", byte_string = 66541025, 
byte_string_start = 0x432ca60 "\306\030\t\203\016", constants = 73237205, next 
= 0x0}
        top = 0x7fffb4ebe2d0
        result = <optimized out>
#12 0x0000000000568431 in funcall_lambda (fun=73237541, nargs=<optimized out>, 
arg_vector=0x7fffb4ebe4a8) at eval.c:3166
        val = <optimized out>
        syms_left = 11983314
        next = <optimized out>
        lexenv = 11983314
        count = 4
        i = <optimized out>
        optional = <optimized out>
        rest = <optimized out>
#13 0x000000000056879b in Ffuncall (nargs=4, args=0x7fffb4ebe4a0) at eval.c:2996
        fun = <optimized out>
        original_fun = 73235010
        funcar = <optimized out>
        numargs = 3
        lisp_numargs = 12
        val = <optimized out>
        backtrace = {next = 0x7fffb4ebe6a0, function = 0x7fffb4ebe4a0, args = 
0x7fffb4ebe4a8, nargs = 3, debug_on_exit = 0}
        internal_args = <optimized out>
        i = <optimized out>
#14 0x0000000000521da1 in Fread_buffer (prompt=175042785, def=75650225, 
require_match=11983362) at minibuf.c:1186
        args = {73235010, 175042785, 75650225, 11983362}
        result = <optimized out>
        s = <optimized out>
        len = <optimized out>
        count = 3
#15 0x00000000005651eb in Fcall_interactively (function=12121826, 
record_flag=11983314, keys=140736228746584) at callint.c:513
        args = 0x7fffb4ebe550
        visargs = 0x7fffb4ebe530
        specs = <optimized out>
        filter_specs = <optimized out>
        teml = <optimized out>
        up_event = 11983314
        enable = 12029632
        speccount = <optimized out>
        next_event = 2
        prefix_arg = 11983314
        string = <optimized out>
        tem = 0x7fffb4ebe570 "bKill buffer: "
        varies = 0x7fffb4ebe510 ""
        i = <optimized out>
        nargs = <optimized out>
        foo = <optimized out>
        arg_from_tty = <optimized out>
        key_count = 2
        record_then_fail = 0
        save_this_command = 12121826
        save_last_command = 12573810
        save_this_original_command = 12121826
        save_real_this_command = 12121826
#16 0x0000000000568941 in Ffuncall (nargs=<optimized out>, args=0x7fffb4ebe710) 
at eval.c:2942
        fun = <optimized out>
        original_fun = <optimized out>
        funcar = <optimized out>
        numargs = <optimized out>
        lisp_numargs = 12
        val = <optimized out>
        backtrace = {next = 0x0, function = 0x7fffb4ebe710, args = 
0x7fffb4ebe718, nargs = 3, debug_on_exit = 0}
        internal_args = 0x7fffb4ebe718
        i = <optimized out>
#17 0x0000000000568ba4 in call3 (fn=<optimized out>, arg1=<optimized out>, 
arg2=<optimized out>, arg3=<optimized out>) at eval.c:2735
        ret_ungc_val = 3
        args = {12123538, 12121826, 11983314, 11983314}
#18 0x00000000005020a9 in command_loop_1 () at keyboard.c:1572
        scount = 2
        cmd = <optimized out>
        keybuf = {96, 428, 14456608, 11983362, 11983314, 11983314, 12036610, 2, 
140736228747264, 5793748, 7237112172834486626, 140736228749157, 
140736228747264, 5793375, 0, 8638097, 140092607576064, 185880422, 11983314, 
          4294967295, 140736228749216, 140736228747312, 5204785, 14456544, 
185880422, 11983314, 5205116, 11983104, 5598978}
        i = <optimized out>
        prev_modiff = 34301
        prev_buffer = 0x4825980
#19 0x0000000000566c66 in internal_condition_case (bfun=0x501d10 
<command_loop_1>, handlers=12035554, hfun=0x4f6b80 <cmd_error>) at eval.c:1448
        val = <optimized out>
        c = {tag = 11983314, val = 11983314, next = 0x7fffb4ebea30, gcpro = 
0x0, jmp = {{__jmpbuf = {14456544, -8280186705055344401, 11983314, 
140736228748936, 4294967295, 140736228749216, 8280349918095448303, 
              __mask_was_saved = 0, __saved_mask = {__val = {0, 110932256, 0, 
0, 14456544, 8585672, 0, 4294967295, 140736228749216, 0, 140092691631972, 1, 0, 
0, 140092607547024, 0}}}}, backlist = 0x0, handlerlist = 0x0,
          lisp_eval_depth = 0, pdlcount = 2, poll_suppress_count = 1, 
interrupt_input_blocked = 0, byte_stack = 0x0}
        h = {handler = 12035554, var = 11983314, chosen_clause = 11983362, tag 
= 0x7fffb4ebe8c0, next = 0x0}
#20 0x00000000004f50ee in command_loop_2 (ignore=<optimized out>) at 
        val = 3
#21 0x0000000000566b48 in internal_catch (tag=-6931673145220792320, 
func=0x4f50d0 <command_loop_2>, arg=11983314) at eval.c:1205
        c = {tag = 12031298, val = 11983314, next = 0x0, gcpro = 0x0, jmp = 
{{__jmpbuf = {14456544, -8280186705055344401, 11983314, 140736228748936, 
4294967295, 140736228749216, 8280349918045116655, -8280185561650718481},
              __mask_was_saved = 0, __saved_mask = {__val = {0, 0, 0, 0, 0, 0, 
5957193, 17904128, 140736228748136, 384, 140736228748128, 6269430, 11983314, 
12209458, 5677638, 14}}}}, backlist = 0x0, handlerlist = 0x0,
          lisp_eval_depth = 0, pdlcount = 2, poll_suppress_count = 1, 
interrupt_input_blocked = 0, byte_stack = 0x0}
#22 0x00000000004f6657 in command_loop () at keyboard.c:1139
No locals.
#23 recursive_edit_1 () at keyboard.c:759
        count = 1
        val = 11983314
#24 0x00000000004f698c in Frecursive_edit () at keyboard.c:823
        count = 0
        buffer = 11983314
#25 0x0000000000411de8 in main (argc=2, argv=<optimized out>) at emacs.c:1711
        dummy = 0
        stack_bottom_variable = 0 '\000'
        do_initial_setlocale = <optimized out>
        skip_args = 1
        rlim = {rlim_cur = 33554432, rlim_max = 33554432}
        no_loadup = 0
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x7f69da1c2c48 "2'"

In GNU Emacs (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2012-04-24 on spindle
Bzr revision: 108019 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11003901
Configured using:
 `configure '--without-pop' '--without-kerberos' '--without-hesiod'
 '--without-mmdf' '--with-x-toolkit=lucid' '--with-wide-int'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  gnus-mailing-list-mode: t
  diff-auto-refine-mode: t
  iswitchb-mode: t
  global-cwarn-mode: t
  show-paren-mode: t
  global-semantic-mru-bookmark-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  global-semantic-idle-summary-mode: t
  global-semantic-decoration-mode: t
  global-auto-complete-mode: t
  compile-bookmarks-mode: t
  global-semantic-highlight-func-mode: t
  global-semantic-stickyfunc-mode: t
  semantic-mode: t
  type-break-mode-line-message-mode: t
  icomplete-mode: t
  recentf-mode: t
  mv-shell-mode: t
  shell-dirtrack-mode: t
  which-function-mode: t
  desktop-save-mode: t
  display-time-mode: t
  tooltip-mode: t
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  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
<return> <prior> <prior> <down> <up> <down> <down> 
<down> <down> <down> <down> <down> <down> <up> <up> 
C-k C-k <up> <up> <up> <up> <up> <up> <down> <down> 
C-y C-k C-k <down> <down> C-k C-k C-k C-k C-k C-/ <down> 
<up> C-SPC <down> C-w <up> <up> <up> <up> C-y C-k C-k 
<down> <down> <down> <down> <down> <down> <down> <up> 
<up> <up> <up> C-k <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<down> <down> <down> <down> <next> <up> <up> <up> <up> 
C-k C-k C-k C-k C-k C-k C-k C-k <right> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> C-c C-c <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <down> M-g 
<next> <next> <up> q <down> <down> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <return> <return> C-s 
m i n i b u f f e r C-s C-s C-s C-s C-s C-s C-s C-s 
C-s <left> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <S-down> <S-down> <S-down> <S-down> 
<S-down> <S-down> <return> M S-SPC C-s C-s C-s C-s 
C-s C-s C-s C-s C-s <left> <return> SPC SPC SPC n n 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> a C-x 
k <return> a C-x k <return> M-x r e p o r t - e m <tab> 

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Load-path shadows:
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/home/nix/lisp/emacs/site-wide/site-start hides 
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code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting x-toolkit x multi-tty emacs)

NULL && (void)

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