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.
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/home/yangsheng/.emacs.d/elpa/26.1/develop/org-plus-contrib-20180611/ob-picolisp
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/home/yangsheng/.emacs.d/elpa/26.1/develop/org-plus-contrib-20180611/org-macro
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/home/yangsheng/.emacs.d/elpa/26.1/develop/org-plus-contrib-20180611/org
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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
gravatar url-cache org-timer org-clock expand-region
text-mode-expansions cc-mode-expansions the-org-mode-expansions
ruby-mode-expansions python-el-fgallina-expansions
latex-mode-expansions
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
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hexl
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helm-types helm-elisp-package helm-font haml-mode
smartparens-markdown
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helm-imenu
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yasnippet rainbow-mode color elec-pair window-purpose-core
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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