bug#31995: 26.1; Condition-case failed to catch error

[杨圣]

I was trying to read code of undo-tree when I encounter this problem.
Here is a somewhat simplified version with some debug output (and the
offending undo-tree file can be found in attachment or at
https://dimlight.tk/~yangsheng/undo-tree):

'''
(defun load-undo-tree-history ()
   (interactive)
   (let ((filename "~/undo-tree"))
     (with-temp-buffer
       (insert-file-contents filename)
       (goto-char (point-min))
       (condition-case err
         (progn
           (message "before reading hash")
           (setq hash (read (current-buffer)))
           (message "before reading tree")
           (setq tree (read (current-buffer)))
           (message "after reading tree"))
         (error (message "error caught")))
       (message "outside condition-case")
    (kill-buffer nil))))
'''

The undo-tree file contains two lines, the first is a hash, and the
second is a undo-tree structure printed with ~prin1~. Some error will
happen in the second ~(read (current-buffer))~, so the expected behavior
is the following output:

'''
before reading hash
before reading tree
error caught
outside condition-case
'''

However, here is what I get.

'''
before reading hash
before reading tree
Re-entering top level after C stack overflow
'''

It seems that the function call ~(read (current-buffer))~ causes C stack
overflow. Though I personally believe the undo-tree file is not
corrupted, I assume this error should be caught by condition-case even
if the file to read is indeed corrupted.

I bisected with git (using current master head d0e2a341dd) and found the
first commit that introduced this (not exactly the same) problem was

commit f0a1e9ec3fba3d5bea5bd62f525dba3fb005d1b1
Author: Paul Eggert
Date: Thu Dec 8 11:32:48 2016 -0800

Make read1 more reentrant

This is needed if ‘read’ is called soon after startup, before the
Unicode tables have been set up, and it reads a \N escape and
needs to look up a value the Unicode tables, a lookup that in turn
calls read1 recursively. Although this change doesn’t make ‘read’
fully reentrant, it’s good enough to handle this case.
,* src/lread.c (read_buffer_size, read_buffer): Remove static vars.
(grow_read_buffer): Revamp to use locals, not statics, and to
record memory allocation un the specpdl. All callers changed.
(read1): Start with a stack-based buffer, and use the heap
only if the stack buffer is too small. Use unbind_to to
free any heap buffer allocated. Use bool for boolean.
Redo symbol loop so that only one call to grow_read_buffer
is needed.
(init_obarray): Remove no-longer-needed initialization.

Starting from this commit, the previous elisp code will crash emacs. An
attempt to fix this problem is

commit 9dee1c884eb50ba282eb9dd2495c5269add25963
Author: Paul Eggert
Date: Fri Jul 14 04:54:05 2017 -0700

Improve stack-overflow heuristic on GNU/Linux

Problem reported by Steve Kemp (Bug#27585).
,* src/eval.c (near_C_stack_top): Remove. All uses replaced
by current_thread->stack_top.
(record_in_backtrace): Set current_thread->stack_top.
This is for when the Lisp interpreter calls itself.
,* src/lread.c (read1): Set current_thread->stack_top.
This is for recursive s-_expression_ reads.
,* src/print.c (print_object): Set current_thread->stack_top.
This is for recursive s-_expression_ printing.
,* src/thread.c (mark_one_thread): Get stack top first.
,* src/thread.h (struct thread_state.stack_top): Now void *, not char *.

This commit fixed the crashing problem, but error catching still does
not work. As indicated in commit 9dee1c88, this commit tries to fix
Bug#27585, where Steve Kemp triggered it with a huge number of '`' or
',' . Wrapping these '`' or ',' with condition-case can also trigger the
problem.


Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
--localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
-fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2

Important settings:
value of $LANG: zh_CN.utf-8
value of $XMODIFIERS: @im=fcitx
locale-coding-system: utf-8-unix

Major mode: Spacemacs buffer

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anzu-mode: t
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evil-mode: t
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spacemacs-leader-override-mode: t
global-spacemacs-leader-override-mode: t
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ido-vertical-mode: t
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mouse-wheel-mode: t
file-name-shadow-mode: t
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auto-composition-mode: t
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Features:
(shadow emacsbug mailalias mailclient sendmail qp mail-extr sort view
reftex-global magit-ediff evil-ediff ediff-merg ediff-wind ediff-diff
ediff-mult ediff-help ediff-init ediff-util ediff vc vc-dispatcher
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js2-mode-expansions js-mode-expansions web-mode-expansions
html-mode-expansions css-mode-expansions er-basic-expansions
expand-region-core expand-region-custom hide-comnt helm-find handwrite
hangul hanja-util quail helm-id-utils cal-bahai helm-sys helm-color
simple-httpd helm-eshell cal-china-x help-at-pt highlight-indentation
helm-config helm-easymenu helm-semantic helm-man hashcash helm-ring
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helm-locate helm-eval edebug helm-info holidays hol-loaddefs hexl
helm-make htmlize helm-grep helm-regexp helm-adaptive helm-misc
helm-types helm-elisp-package helm-font haml-mode smartparens-markdown
markdown-mode css-mode eww smartparens-ruby ruby-mode hanoi helm-imenu
helm-utils helm-help hilit-chg hungry-delete helm helm-source
helm-multi-match helm-lib canlock use-package-lint use-package-jump
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reftex-cite reftex-parse texmathp pdf-sync pdf-annot pdf-outline
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tex smartparens-latex tex-mode cl-print debug two-column iso-transl
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imenu-list window-purpose window-purpose-fixes
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powerline powerline-separators powerline-themes projectile grep
company-statistics company-files company-keywords company-etags
company-gtags company-template company-dabbrev-code company-dabbrev
company-yasnippet company-capf overseer pkg-info epl auto-compile packed
elisp-slime-nav eval-sexp-fu highlight font-lock+ frame-fns avoid
semantic/db-mode srefactor srefactor-ui recentf tree-widget
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semantic/bovine/c-by semantic/lex-spp semantic/idle semantic/bovine/gcc
semantic/dep semantic/analyze/refs semantic/db-find semantic/db-ref
semantic/analyze semantic/sort semantic/scope semantic/analyze/fcn
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yasnippet rainbow-mode color elec-pair window-purpose-core
window-purpose-configuration window-purpose-utils atomic-chrome
websocket bindat cnfonts cnfonts-ui cal-china lunar solar cal-dst
eterm-256color term ehelp dired-x ranger ivy-rich engine-mode
company-jed

-- 
Sheng Yang(杨圣)
PhD student
Computer Science Department
University of Maryland, College Park
E-mail:yangsheng6810@gmail.com

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