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signal.c: drop dangerous tag

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* signal.c (check_stack_overflow): drop the last tag too close to
  the fault page, to get rid of stack overflow deadlock.
  [Bug #9971]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46499 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2014-06-23 02:11:31 +00:00
parent 2af4240fbb
commit 2bd9a19895
2 changed files with 12 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Mon Jun 23 11:11:16 2014 Nobuyoshi Nakada <nobu@ruby-lang.org>
* signal.c (check_stack_overflow): drop the last tag too close to
the fault page, to get rid of stack overflow deadlock.
[Bug #9971]
Sun Jun 22 09:11:15 2014 NARUSE, Yui <naruse@ruby-lang.org>
* lib/uri/generic.rb: remove registry.

6
signal.c
View file

@ -738,6 +738,12 @@ check_stack_overflow(const uintptr_t addr, const ucontext_t *ctx)
* the fault page can be the next. */
if (sp_page == fault_page || sp_page == fault_page + 1) {
rb_thread_t *th = ruby_current_thread;
if ((uintptr_t)th->tag->buf / pagesize == sp_page) {
/* drop the last tag if it is close to the fault,
* otherwise it can cause stack overflow again at the same
* place. */
th->tag = th->tag->prev;
}
ruby_thread_stack_overflow(th);
}
}