From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin-developers@cygwin.com
Subject: Re: malloc crash
Date: Tue, 26 Oct 2021 18:26:39 +0900 [thread overview]
Message-ID: <20211026182639.92f6f9de086ec35f41deef88@nifty.ne.jp> (raw)
In-Reply-To: <b8ea3fc0-0cb5-fa84-a087-112d6b6631ae@maxrnd.com>
On Tue, 26 Oct 2021 01:59:36 -0700
Mark Geisert wrote:
> Takashi Yano wrote:
> > On Tue, 26 Oct 2021 01:30:13 -0700
> > Mark Geisert wrote:
> >> Apologies; this was many months ago. What I did try was moving the malloc_init()
> >> to before running the constructor chain, as Takashi suggested. That is what gave
> >> me more problems. I don't recall what they were, but I reverted that attempt.
> >>
> >> The "future malloc" build of Cygwin I'm running doesn't exhibit Ken's issue, as
> >> far as I can tell. It has a specific fix to avoid the scenario I've been talking
> >> about here, but I don't want to take us down that path unless we're sure Ken's
> >> hitting that same scenario.
> >
> > I tried the following patch, and confirmed that the issue has
> > been disappeared. I do not notice any other problems so far
> > with this patch.
> >
> > diff --git a/winsup/cygwin/dcrt0.cc b/winsup/cygwin/dcrt0.cc
> > index 6f4723bb0..0d541ec14 100644
> > --- a/winsup/cygwin/dcrt0.cc
> > +++ b/winsup/cygwin/dcrt0.cc
> > @@ -773,6 +773,10 @@ dll_crt0_0 ()
> > do_global_ctors (&__CTOR_LIST__, 1);
>
> ^^^^^^^^^^^^^^^
>
> > cygthread::init ();
> >
> > + /* malloc_init() has been moved from dll_crt0_1() to here so that
> > + malloc() can be called in fixup_after_exec(). */
> > + malloc_init ();
> > +
> > if (!child_proc_info)
> > {
> > setup_cygheap ();
> > @@ -857,7 +861,7 @@ dll_crt0_1 (void *)
> > on a functioning malloc and it's possible that the user's program may
> > have overridden malloc. We only know about that at this stage,
> > unfortunately. */
> > - malloc_init ();
> > + /* malloc_init() has been moved to dll_crt0_0(). */
> > user_shared->initialize ();
> >
> > #ifdef CYGHEAP_DEBUG
> >
> >
> > Where is the "constructor chain" you mentioned?
>
> See above. Try moving your new lines above the call to do_global_ctors(). Also
> note the comment just above the original location of those lines.. you're now
> ignoring what the comment warns about.
I have just tried moving malloc_init() before do_global_ctors(),
however, I do not encountered any problems.
I do not understand what "user's program may have overridden malloc"
means...
--
Takashi Yano <takashi.yano@nifty.ne.jp>
next prev parent reply other threads:[~2021-10-26 9:26 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-24 21:46 Ken Brown
2021-10-25 8:56 ` Takashi Yano
2021-10-25 13:37 ` Ken Brown
2021-10-25 8:59 ` Corinna Vinschen
2021-10-25 12:35 ` Ken Brown
2021-10-25 15:39 ` Corinna Vinschen
2021-10-25 21:29 ` Mark Geisert
2021-10-25 22:02 ` Ken Brown
2021-10-25 23:36 ` Mark Geisert
2021-10-26 0:18 ` Takashi Yano
2021-10-26 0:54 ` Mark Geisert
2021-10-26 8:30 ` Mark Geisert
2021-10-26 8:52 ` Takashi Yano
2021-10-26 8:59 ` Mark Geisert
2021-10-26 9:26 ` Takashi Yano [this message]
2021-10-26 9:31 ` Corinna Vinschen
2021-10-26 9:28 ` Corinna Vinschen
2021-10-26 9:27 ` Corinna Vinschen
2021-10-26 9:24 ` Corinna Vinschen
2021-10-26 14:32 ` Ken Brown
2021-10-26 16:03 ` Corinna Vinschen
2021-10-26 16:36 ` Ken Brown
2021-10-26 16:49 ` Corinna Vinschen
2021-10-26 17:10 ` Ken Brown
2021-10-27 0:44 ` Takashi Yano
2021-10-27 9:01 ` Corinna Vinschen
2021-10-26 16:44 ` Takashi Yano
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