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Date:	Thu, 19 Jan 2023 09:31:40 -0700
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Subject:	Re: Cygwin 3.4.3 and 3.5.0... hangs in make, top, procps, ls
	/proc/PID/...
To:	cygwin AT cygwin DOT com
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From:	Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Brian Inglis <Brian DOT Inglis AT Shaw DOT ca>
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On 2023-01-18 02:42, Corinna Vinschen via Cygwin wrote:
> Hi Takashi,
> 
> On Jan 18 18:16, Takashi Yano via Cygwin wrote:
>>> On Jan 16 22:42, Corinna Vinschen via Cygwin wrote:
>>> I pushed some patches to fix this issue.  Excessive debugging indicated
>>> that the reason cygcheck fails in this way is:
>>>
>>> - It's a non-Cygwin process which
>>>
>>> - is built with high-entropy ASLR and
>>>
>>> - tries to load the Cygwin DLL dynamically and
>>>
>>> - therefore suffers from the fact that recent Cygwin code doesn't
>>>    expect that certain memory regions are used by Windows itself.
>>>    Which they are, due to the high-entropy stuff.
>>>
>>> The patches are supposed to make the code less rigid in terms of the
>>> addresses of certain memory regions, as well as dropping the
>>> high-entropy VA flag from builds of strace and cygcheck, both of which
>>> are loading the Cygwin DLL dynamically as part of their job.
>>>
>>> The test release 3.5.0-0.116.g8d318bf142f7 contains the patches, for
>>> everybody to try.
>>
>> Thank you very much for working on this problem. It seems that
>> it was unexpectedly large-scale modification.
>>
>> I confirmed that the problem has been fixed with these patches.
>> The test case has been running for 11 hours but the problem does
>> not happen so far.

> Great.
> 
> I tested this yesterday with 7 runs on two machines in parallel while
> building Cygwin continuously in another Window, and cygcheck still with
> high-entropy-VA enabled.  And one of the machines continued to run the
> cygcheck loops over night and were still in good shape this morning :)
> 
> I guess we should release 3.4.4 pretty soon now.

I installed and tested 3.5.0-0.122.g3c2ac163da88.x86_64 instead, as that was the 
autoselected test version.

When cygcheck -hrsv was run as usual in local postinstall script
zp_z2_l_cygcheck-hrsv.dash gave error msg box can't find zlib1.dll - but it's 
there:

$ ls -glo /usr/x86_64-w64-mingw32/sys-root/mingw/bin/zlib1.dll
-rwxr-xr-x 1 117267 Oct 15 12:14 
/usr/x86_64-w64-mingw32/sys-root/mingw/bin/zlib1.dll

Under X/mintty/bash cygcheck will not even start - says so in error msg box with 
code 0xc000007b!

-- 
Take care. Thanks, Brian Inglis			Calgary, Alberta, Canada

La perfection est atteinte			Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter	not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer	but when there is no more to cut
			-- Antoine de Saint-Exupéry

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