Hi Uday, welcome back.  this crash is fixed for me by the following patch
which makes newlim twice as large.  I wasnt able to make the emacs
developers implement this in the distribution, so am compiling myself...

      ratio += ratio / 3;
      /* Add in some extra to cover
 what we're likely to use for other reasons.  [FIX: added (...)*2] */
      newlim = (re_max_failures * ratio + 200000)*2;


On Wed, Oct 29, 2014 at 6:53 PM, Uday Reddy <email address hidden> wrote:

> ** Changed in: vm
>        Status: New => Incomplete
>
> ** Changed in: vm
>    Importance: Undecided => High
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1256783
>
> Title:
>   emacs crashes possibly related to vm
>
> Status in VM (View Mail) for Emacs:
>   Incomplete
>
> Bug description:
>   Hi vm friends and masters,
>
>   I have been experiencing repeated crashes on Mac-Emacs, perhaps
>   related to vm usage, and am wondering if the following reports could
>   lead someone to figure out what the problem might be.  Specifically
>   (see below), does anyone have an idea if a "deeply nested Lisp data
>   structure" is created in vm and if this can be avoided?  These crashes
>   occur after a few hours of normal use, almost always during reading
>   mail with vm.  I am attaching an abbreviated backtrace when running
>   emacs under a debugger, and and the full one (8Mb) is available at
>   https://www.dropbox.com/s/3hg8v9ct2omc8x9/emacs-bt.txt.  I am happy to
>   try helping with the debugging given specific instructions on commands
>   to give lldb.  I am using the latest development vm.
>
>   I wrote YAMAMOTO Mitsuharu, the Emacs for mac developer, and his
>   response is
>
>   > The backtrace shows that the stack is used up because some deeply
>   > nested Lisp data structure is recursively traversed in garbage
>   > collection (or possibly an unknown bug in the GC code).  In normal OSX
>   > applications, the stack depth for the main thread is set to 8MiB by
>   > default, and Emacs slightly enlarges it to 8720000B (on 64-bit binary)
>   > by some formula in src/emacs.c:
>
>   >    817            long newlim;
>   >    818            extern size_t re_max_failures;
>   >    819            /* Approximate the amount regex.c needs per unit of
> re_max_failures.  */
>   >    820            int ratio = 20 * sizeof (char *);
>   >    821            /* Then add 33% to cover the size of the smaller
> stacks that regex.c
>   >    822               successively allocates and discards, on its way
> to the maximum.  */
>   >    823            ratio += ratio / 3;
>   >    824            /* Add in some extra to cover
>   >    825               what we're likely to use for other reasons.  */
>   >    826            newlim = re_max_failures * ratio + 200000;
>
>   > Probably you can tweak the ratio value above and see if it mitigates
>   > the problem.
>
>   Here is the bug report itself:
>
>   ------------------------------------------------------------------------
>   In GNU Emacs 24.3.2 (x86_64-apple-darwin11.4.2, Carbon Version 1.6.0
> AppKit 1138.51)
>    of 2013-11-08 on Yukikaze.local
>   Windowing system distributor `Apple Inc.', version 10.9.0
>   Configured using:
>    `configure '--with-mac'
> '--enable-mac-app=/Users/xin/Documents/emacs-mac-port/build'
> '--prefix=/Users/xin/Documents/emacs-mac-port/build''
>
>   Important settings:
>     locale-coding-system: utf-8-unix
>     default enable-multibyte-characters: t
>
>   Major mode: Dired by name
>
>   Minor modes in effect:
>     delete-selection-mode: t
>     display-time-mode: t
>     auto-image-file-mode: t
>     shell-dirtrack-mode: t
>     tooltip-mode: t
>     mac-mouse-wheel-mode: t
>     tool-bar-mode: t
>     menu-bar-mode: t
>     file-name-shadow-mode: t
>     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
>     buffer-read-only: t
>     line-number-mode: t
>     transient-mark-mode: t
>     abbrev-mode: t
>
>   Recent input:
>
>
>   Recent messages:
>   Loading .session...done
>   For information about GNU Emacs and the GNU system, type C-h C-a. [2
> times]
>   ls does not support --dired; see `dired-use-ls-dired' for more details.
>   Quit
>   Move: 1 of 2
>   Move: 2 of 2
>   Move: 2 files
>   Deleting...done
>   Deleting...done
>   Making completion list...
>
>   Load-path shadows:
>   None found.
>
>   Features:
>   (shadow vm-reply vm-pcrisis vcard u-vm-color smtpmail w3m browse-url
> doc-view jka-compr image-mode w3m-hist w3m-fb w3m-ems w3m-ccl ccl
> w3m-favicon w3m-image w3m-proc w3m-util mairix vm-rfaddons vm-page
> vm-minibuf emacsbug dired-aux info view cal-china lunar solar cal-dst
> cal-bahai cal-islam cal-julian cal-hebrew holidays hol-loaddefs mule-util
> cal-move goto-addr thingatpt cal-x em-unix em-term term disp-table ehelp
> electric em-script em-prompt em-ls em-hist em-pred em-glob em-dirs em-cmpl
> em-basic em-banner em-alias esh-var esh-io esh-cmd esh-opt esh-ext esh-proc
> esh-arg eldoc esh-groups eshell esh-module esh-mode esh-util
> srecode/srt-mode semantic/analyze semantic/sort semantic/scope
> semantic/analyze/fcn semantic/format srecode/template srecode/srt-wy
> semantic/wisent semantic/wisent/wisent semantic/ctxt srecode/ctxt
> semantic/tag-ls semantic/find srecode/compile srecode/dictionary
> srecode/table srecode/map srecode semanticdb-matlab semantic/db
> semantic/util-modes semantic/util semantic semantic/tag semantic/lex
> semantic/fw mode-local cedet eieio-base eieio-opt help-mode speedbar
> sb-image ezimage dframe find-func cedet-matlab matlab derived tempo
> matlab-load osx-osascript message-x server url url-proxy url-privacy
> url-expand url-methods url-history url-cookie url-domsuf url-util mailcap
> telnet dired-efap bbdb-vcard-export bbdb-print sendmail flyspell message
> mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
> rfc2045 ietf-drums mail-utils gmm-utils mailheader bbdb-vm vm-virtual
> vm-summary-faces vm-pop utf7 vm-imap vm-thread vm-mime vm-mouse vm-toolbar
> vm-menu vm-window vm-folder vm-crypto vm-summary vm-motion vm-undo vm-misc
> vm-message vm-macro bbdb-snarf mail-extr rfc822 bbdb-com mailabbrev
> bbdb-autoloads bbdb timezone ffap url-parse url-vars auto-capitalize
> dired-x cl-macs gv rect-mark preview-latex tex-site auto-loads delsel appt
> cus-edit wid-edit dictionary link connection icalendar diary-lib
> diary-loaddefs cal-menu calendar cal-loaddefs rect ediff-merg ediff-diff
> ediff-wind ediff-help ediff-util ediff-mult ediff-init ediff dired ispell
> easymenu ibuffer edmacro kmacro vm-autoloads vm-vars vm-version vm session
> uniquify warnings time image-file cus-start cus-load password cl tramp
> tramp-compat auth-source eieio byte-opt bytecomp byte-compile cconv
> gnus-util mm-util mail-prsvr password-cache tramp-loaddefs shell pcomplete
> comint ansi-color ring format-spec advice help-fns cl-lib advice-preload
> time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel mac-win
> tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
> lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse
> jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang
> misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
> romanian slovak czech european ethiopic indian cyrillic chinese case-table
> epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
> cus-face macroexp files text-properties overlay sha1 md5 base64 format env
> code-pages mule custom widget hashtable-print-readable backquote mac
> multi-tty make-network-process emacs)
>
>
>   An abbreviated backtrace:
>
>   Last login: Sun Dec  1 15:52:10 on ttys000
>   udp003015uds:~ $ lldb /Applications/Emacs.app/Contents/MacOS/Emacs
>   Current executable set to '/Applications/Emacs.app/Contents/MacOS/Emacs'
> (x86_64).
>   (lldb) run
>   Process 5425 launched: '/Applications/Emacs.app/Contents/MacOS/Emacs'
> (x86_64)
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   ...
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   2013-12-01 15:56:54.773 Emacs[5425:d0b] -_continuousScroll is deprecated
> for NSScrollWheel. Please use -hasPreciseScrollingDeltas.
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   ...
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGCHLD
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped and restarted: thread 1 received signal: SIGALRM
>   Process 5425 stopped
>   * thread #1: tid = 0x484e3, 0x00000001000f61d1 Emacs`mark_object + 1073,
> queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=2,
> address=0x7fff5f3aeff8)
>       frame #0: 0x00000001000f61d1 Emacs`mark_object + 1073
>   Emacs`mark_object + 1073:
>   -> 0x1000f61d1:  callq  0x1000f5da0               ; mark_object
>      0x1000f61d6:  movq   32(%r14), %rdi
>      0x1000f61da:  callq  0x1000f5da0               ; mark_object
>      0x1000f61df:  movl   (%r14), %eax
>   (lldb) bt
>   * thread #1: tid = 0x484e3, 0x00000001000f61d1 Emacs`mark_object + 1073,
> queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=2,
> address=0x7fff5f3aeff8)
>       frame #0: 0x00000001000f61d1 Emacs`mark_object + 1073
>       frame #1: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #2: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #3: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #4: 0x00000001000f62ab Emacs`mark_object + 1291
>       frame #5: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #6: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #7: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #8: 0x00000001000f62ab Emacs`mark_object + 1291
>       frame #9: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #10: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #11: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #12: 0x00000001000f62ab Emacs`mark_object + 1291
>   ...
>       frame #136042: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136043: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136044: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136045: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136046: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136047: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136048: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136049: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136050: 0x00000001000f5e20 Emacs`mark_object + 128
>       frame #136051: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136052: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #136053: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136054: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #136055: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136056: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136057: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136058: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136059: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136060: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136061: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #136062: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136063: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136064: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136065: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136066: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136067: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136068: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #136069: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136070: 0x00000001000f61a8 Emacs`mark_object + 1032
>       frame #136071: 0x00000001000f61d6 Emacs`mark_object + 1078
>       frame #136072: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136073: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136074: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136075: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136076: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136077: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136078: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136079: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136080: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136081: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136082: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136083: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136084: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136085: 0x00000001000f61df Emacs`mark_object + 1087
>       frame #136086: 0x00000001000f6443 Emacs`mark_object + 1699
>       frame #136087: 0x00000001000f65a9 Emacs`mark_buffer + 105
>       frame #136088: 0x00000001000faffd Emacs`Fgarbage_collect + 637
>       frame #136089: 0x000000010014ad63 Emacs`exec_byte_code + 1027
>       frame #136090: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136091: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136092: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136093: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136094: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136095: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136096: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136097: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136098: 0x0000000100116b5e Emacs`call1 + 30
>       frame #136099: 0x0000000100131c4b Emacs`Fmapatoms + 203
>       frame #136100: 0x0000000100113990 Emacs`Ffuncall + 1200
>       frame #136101: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136102: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136103: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136104: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136105: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136106: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136107: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136108: 0x00000001001161d7 Emacs`eval_sub + 1463
>       frame #136109: 0x00000001001152f5 Emacs`internal_catch + 213
>       frame #136110: 0x000000010014bca4 Emacs`exec_byte_code + 4932
>       frame #136111: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136112: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136113: 0x000000010014b108 Emacs`exec_byte_code + 1960
>       frame #136114: 0x00000001001169b7 Emacs`funcall_lambda + 871
>       frame #136115: 0x00000001001165b3 Emacs`apply_lambda + 291
>       frame #136116: 0x00000001001162f7 Emacs`eval_sub + 1751
>       frame #136117: 0x0000000100111509 Emacs`Fprogn + 41
>       frame #136118: 0x000000010010709e Emacs`Fsave_excursion + 62
>       frame #136119: 0x0000000100115f95 Emacs`eval_sub + 885
>       frame #136120: 0x0000000100116969 Emacs`funcall_lambda + 793
>       frame #136121: 0x0000000100113968 Emacs`Ffuncall + 1160
>       frame #136122: 0x00000001001158f6 Emacs`apply1 + 38
>       frame #136123: 0x000000010010f8b9 Emacs`Fcall_interactively + 1321
>       frame #136124: 0x00000001001138a4 Emacs`Ffuncall + 964
>       frame #136125: 0x0000000100116b36 Emacs`call3 + 38
>       frame #136126: 0x00000001000aeb12 Emacs`command_loop_1 + 1554
>       frame #136127: 0x00000001001151f9 Emacs`internal_condition_case + 297
>       frame #136128: 0x00000001000ae4dd Emacs`command_loop_2 + 77
>       frame #136129: 0x00000001001152f5 Emacs`internal_catch + 213
>       frame #136130: 0x00000001000afee2 Emacs`recursive_edit_1 + 226
>       frame #136131: 0x00000001000a0b67 Emacs`Frecursive_edit + 231
>       frame #136132: 0x000000010009d8b8 Emacs`main + 5208
>       frame #136133: 0x0000000100002554 Emacs`start + 52
>   (lldb) exit
>   Quitting LLDB will kill one or more processes. Do you really want to
> proceed: [Y/n] y
>   udp003015uds:~ $
>   ------------------------------------------------------------------------
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/vm/+bug/1256783/+subscriptions
>