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Date: Mon, 2 Jan 2023 17:21:47 +0900
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin 3.4.3 and 3.5.0... hangs in make, top, procps, ls
 /proc/PID/...
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Mon, 2 Jan 2023 14:38:03 +0900
Takashi Yano wrote:
> On Mon, 2 Jan 2023 11:32:01 +0900
> Takashi Yano wrote:
> > On Sat, 31 Dec 2022 13:01:29 -0700
> > Brian Inglis wrote:
> > > was also getting the messages below locally and still on GitHub scallywag:
> > > 
> > > 	cygcheck (6936) child_copy: cygheap read copy failed,
> > > 
> > > ../curl/scallywag/1_x86_64  build.log:2022-12-26T00:39:35.6163236Z       0 
> > > [main] cygcheck (6936) child_copy: cygheap read copy failed, 0x0..0x80003B5F0, 
> > > done 0, windows pid 6936, Win32 error 299
> > > ../curl/scallywag/1_x86_64  build.log:2022-12-26T00:48:03.4525278Z       0 
> > > [main] cygcheck (568) child_copy: cygheap read copy failed, 0x0..0x80003BA48, 
> > > done 0, windows pid 568, Win32 error 299
> > > ../dialog/scallywag/1_x86_64  build.log:2022-12-31T18:42:37.0939902Z       0 
> > > [main] cygcheck (6992) child_copy: cygheap read copy failed, 0x0..0x80003CB38, 
> > > done 0, windows pid 6992, Win32 error 299
> > 
> > I guess this is another problem.
> 
> I found this issue occurs after the commit 30add3e6b3e3:
> "Cygwin: exec: don't access cygheap before it's initialized"
> .
> 
> Reverting this commit solves the issue.
> 
> To reproduce the problem relatively frequently, try:
> while true; do cygcheck -cd cygwin > /dev/null; done
> in bash.
> 
> Corinna, could you please have a look at this issue as well?

I'm not sure if this is the right thing, but the following
patch seems to fix the issue.

diff --git a/winsup/cygwin/dcrt0.cc b/winsup/cygwin/dcrt0.cc
index 5c5a280cc..49b7a44ae 100644
--- a/winsup/cygwin/dcrt0.cc
+++ b/winsup/cygwin/dcrt0.cc
@@ -631,8 +631,6 @@ child_info_spawn::handle_spawn ()
   if (!dynamically_loaded || get_parent_handle ())
       {
 	cygheap_fixup_in_child (true);
-	if (dynamically_loaded)
-	  moreinfo->myself_pinfo = NULL;
 	memory_init ();
       }
 
diff --git a/winsup/cygwin/mm/cygheap.cc b/winsup/cygwin/mm/cygheap.cc
index 72861d8d7..6a20c159a 100644
--- a/winsup/cygwin/mm/cygheap.cc
+++ b/winsup/cygwin/mm/cygheap.cc
@@ -95,6 +95,8 @@ cygheap_fixup_in_child (bool execed)
   cygheap = (init_cygheap *) VirtualAlloc ((LPVOID) CYGHEAP_STORAGE_LOW,
 					   commit_size, MEM_COMMIT,
 					   PAGE_READWRITE);
+  if (dynamically_loaded && execed)
+    spawn_info->moreinfo->myself_pinfo = NULL;
   cygheap_max = child_proc_info->cygheap_max;
   child_copy (child_proc_info->parent, false, child_proc_info->silentfail (),
 	      "cygheap", cygheap, cygheap_max, NULL);


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

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