DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 56IF5GZc2981411
Authentication-Results: delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results: delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter: OpenDKIM Filter v2.11.0 delorie.com 56IF5GZc2981411
X-Recipient: archive-cygwin AT delorie DOT com
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org A881D385EC3F
ARC-Filter: OpenARC Filter v1.0.0 sourceware.org A881D385EC3F
ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1752851100; cv=none;
 b=tOUrQC45/kfdsoBlsnDgTgMfWY1+50j/RcTc75N6n7i5FRdrgWsvIlyPdppOfwpZGwyC9q6HwWtHrrV+lfs1VfGOxHttu1L3U0odxxJuoSm3QhJAor0AsYiYLVc4dxP7aaoldXivWI8+pFAYat7jQebK0zLBfkp4BsKo8oFqWpE=
ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key;
 t=1752851100; c=relaxed/simple;
 bh=+8Wm7HoS6ebwy0btQb7OTJKymUYEIfUl2slKaelhQ/U=;
 h=Date:From:To:Subject:Message-Id:Mime-Version:DKIM-Signature;
 b=liNGFgwEynxNK6IXrmt+tJxY0qbPiKMCMJpUzYPI44eldqRJ2Db9wE2YSfN2Inl0WIsq9bjiO35L1iFTRUXtrdplbUae12YUDKkpOGd6Wy0vFL6kYkWkruxrJPBKUMaqN86d//tVEfbVWzsBGZ2KxPV4JeWsV3H3t8U/hryAKL4=
ARC-Authentication-Results: i=1; server2.sourceware.org
Date: Sat, 19 Jul 2025 00:04:56 +0900
To: cygwin AT cygwin DOT com
Subject: Re: Calling system() in multi-threads.
Message-Id: <20250719000456.61a9c7d3e56269bb75b7e539@nifty.ne.jp>
In-Reply-To: <aHpZbdiHgeRIP1Bk@calimero.vinschen.de>
References: <20250618203127 DOT 71ac180de11230a9a6055185 AT nifty DOT ne DOT jp>
 <20250716235236 DOT 96055ec145d9a0528b50c357 AT nifty DOT ne DOT jp>
 <aHfHCqD2xZcdyu7u AT calimero DOT vinschen DOT de>
 <20250717231421 DOT 56b54f7e96266311101d4c08 AT nifty DOT ne DOT jp>
 <aHkUldQHKjA-lZrw AT calimero DOT vinschen DOT de>
 <20250718004446 DOT 9ce9f7f208566ded1a676fd5 AT nifty DOT ne DOT jp>
 <20250718012800 DOT 45ae0a80ff8bcd286c176baa AT nifty DOT ne DOT jp>
 <aHn9rNKV85wagDCC AT calimero DOT vinschen DOT de>
 <20250718213152 DOT d9ca638eab71395709d6f138 AT nifty DOT ne DOT jp>
 <20250718223201 DOT 421220a18e7e2f7049634071 AT nifty DOT ne DOT jp>
 <aHpZbdiHgeRIP1Bk AT calimero DOT vinschen DOT de>
X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version: 1.0
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.30
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Fri, 18 Jul 2025 16:25:49 +0200
Corinna Vinschen wrote:
> On Jul 18 22:32, Takashi Yano via Cygwin wrote:
> > I embedded debug code into mm/cygheap.cc, that is:
> > 
> > diff --git a/winsup/cygwin/mm/cygheap.cc b/winsup/cygwin/mm/cygheap.cc
> > index 338886468..bab4067e0 100644
> > --- a/winsup/cygwin/mm/cygheap.cc
> > +++ b/winsup/cygwin/mm/cygheap.cc
> > @@ -371,7 +371,16 @@ _cmalloc (unsigned size)
> >    if (cygheap->buckets[b])
> >      {
> >        rvc = (_cmalloc_entry *) cygheap->buckets[b];
> > -      cygheap->buckets[b] = rvc->ptr;
> > +      __try
> > +	{
> > +	  cygheap->buckets[b] = rvc->ptr;
> > +	}
> > +      __except (NO_ERROR)
> > +	{ /* Shouldl not reach */
> > +	  system_printf("b = %d", b);
> > +	  assert (false);
> > +	}
> > +      __endtry
> >        rvc->b = b;
> >      }
> >    else
> > The result is like this! Why???
> > 
> >       0 [main] sh 617 _cmalloc: b = 1
> > assertion "false" failed: file "../../.././winsup/cygwin/mm/cygheap.cc", line 381, function: void* _cmalloc(unsigned int)
> 
> I don't know.  Looks like rvc points into nirvana.  Who's the caller?
> what's the value of cygheap->buckets[1]?  Is something filling up cygheap
> fast, perhaps?  

      0 [main] sh 403 _cmalloc: b = 0
    164 [main] sh 403 _cmalloc: cygheap->buckets[b] = 0x63005C003A0043
      0 [main] sh 405 _cmalloc: b = 0
      0 [main] sh 408 _cmalloc: b = 0
    164 [main] sh 405 _cmalloc: cygheap->buckets[b] = 0x6
      0 [main] sh 407 _cmalloc: b = 0
    166 [main] sh 408 _cmalloc: cygheap->buckets[b] = 0x6
    218 [main] sh 407 _cmalloc: cygheap->buckets[b] = 0x6
      0 [main] sh 404 _cmalloc: b = 0
    167 [main] sh 404 _cmalloc: cygheap->buckets[b] = 0x6
      0 [main] sh 409 _cmalloc: b = 0
    131 [main] sh 409 _cmalloc: cygheap->buckets[b] = 0x6
      1 [main] sh 406 _cmalloc: b = 0
    172 [main] sh 406 _cmalloc: cygheap->buckets[b] = 0x6

cygheap->buckets[b] seems to be broken.

403:
... (infinite loop for ritrieving stacktrace) ...
#2  0x00007fff8bd36ad8 in _cmalloc (size=<optimized out>) at ../../.././winsup/cygwin/mm/cygheap.cc:382
#3  0x00007fff8bd37418 in cmalloc (fn=0x0, n=9, x=HEAP_STR) at ../../.././winsup/cygwin/mm/cygheap.cc:476
#4  cmalloc (n=9, x=HEAP_STR) at ../../.././winsup/cygwin/mm/cygheap.cc:483
#5  crealloc (fn=0x7fff8beb5984 <P+1444> "crealloc", n=9, s=<optimized out>) at ../../.././winsup/cygwin/mm/cygheap.cc:496
#6  crealloc_abort (s=<optimized out>, n=9) at ../../.././winsup/cygwin/mm/cygheap.cc:514
#7  0x00007fff8bc55fd6 in path_conv::set_posix (path_copy=0x1210720 "/dev/tty", this=0x7ffffc800) at ../../.././winsup/cygwin/path.cc:451
#8  path_conv::set_posix (path_copy=0x1210720 "/dev/tty", this=0x7ffffc800) at ../../.././winsup/cygwin/path.cc:446
#9  path_conv::check (this=this AT entry=0x7ffffc800, src=<optimized out>, src AT entry=0x0, opt=6817, suffixes=0x7fff8bf2d1c0 <stat_suffixes>) at ../../.././winsup/cygwin/path.cc:1310
#10 0x00007fff8bc1959c in path_conv::path_conv (suffixes=<optimized out>, opt=6817, src=0x0, this=0x7ffffc800) at /home/yano/newlib-cygwin/winsup/cygwin/local_includes/path.h:312
#11 build_fh_name (name=name AT entry=0x10049d830 "/dev/tty", opt=opt AT entry=6657, si=<optimized out>) at ../../.././winsup/cygwin/dtable.cc:439
#12 0x00007fff8bc92f7a in open (unix_path=0x10049d830 "/dev/tty", flags=16386) at ../../.././winsup/cygwin/syscalls.cc:1488
#13 0x00007fff8bd5a1c4 in _sigfe () at sigfe.s:35
#14 0x000000010040dee5 in check_dev_tty ()
#15 0x00000001004948f1 in main ()

405:
... (infinite loop for ritrieving stacktrace) ...
#2  0x00007fff8bd36ad8 in _cmalloc (size=<optimized out>) at ../../.././winsup/cygwin/mm/cygheap.cc:382
#3  0x00007fff8bd37418 in cmalloc (fn=0x0, n=9, x=HEAP_STR) at ../../.././winsup/cygwin/mm/cygheap.cc:476
#4  cmalloc (n=9, x=HEAP_STR) at ../../.././winsup/cygwin/mm/cygheap.cc:483
#5  crealloc (fn=0x7fff8beb5984 <P+1444> "crealloc", n=9, s=<optimized out>) at ../../.././winsup/cygwin/mm/cygheap.cc:496
#6  crealloc_abort (s=<optimized out>, n=9) at ../../.././winsup/cygwin/mm/cygheap.cc:514
#7  0x00007fff8bc55fd6 in path_conv::set_posix (path_copy=0x1390720 "/dev/tty", this=0x7ffffc800) at ../../.././winsup/cygwin/path.cc:451
#8  path_conv::set_posix (path_copy=0x1390720 "/dev/tty", this=0x7ffffc800) at ../../.././winsup/cygwin/path.cc:446
#9  path_conv::check (this=this AT entry=0x7ffffc800, src=<optimized out>, src AT entry=0x0, opt=6817, suffixes=0x7fff8bf2d1c0 <stat_suffixes>) at ../../.././winsup/cygwin/path.cc:1310
#10 0x00007fff8bc1959c in path_conv::path_conv (suffixes=<optimized out>, opt=6817, src=0x0, this=0x7ffffc800) at /home/yano/newlib-cygwin/winsup/cygwin/local_includes/path.h:312
#11 build_fh_name (name=name AT entry=0x10049d830 "/dev/tty", opt=opt AT entry=6657, si=<optimized out>) at ../../.././winsup/cygwin/dtable.cc:439
#12 0x00007fff8bc92f7a in open (unix_path=0x10049d830 "/dev/tty", flags=16386) at ../../.././winsup/cygwin/syscalls.cc:1488
#13 0x00007fff8bd5a1c4 in _sigfe () at sigfe.s:35
#14 0x000000010040dee5 in check_dev_tty ()
#15 0x00000001004948f1 in main ()



-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple