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Date: Tue, 22 Apr 2025 10:16:27 +0900
To: cygwin AT cygwin DOT com
Subject: Re: git testsuite "t1004-read-tree-m-u-wf.sh" test hang with Cygwin
 3.7.0 ...
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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, 21 Apr 2025 21:54:03 +0200
Roland Mainz via Cygwin <cygwin AT cygwin DOT com> wrote:

> Hi!
> 
> ----
> 
> Running the git testsuite I got a hang of the
> "t1004-read-tree-m-u-wf.sh" test in Cygwin 3.7 - the same test worked
> AFAIK OK with Cygwin 3.5.x.
> 
> My guess: |wait_sig()| and |_sigfe()| are involved, maybe this is a
> signal issue..
> 
> 1. Versions: Cygwin 3.7.0-0.68.g37c49decc835.x86_64 / Windows 10
> 2. Steps to reproduce:
> ---- snip ----
> mkdir gittest
> cd gittest/
> git clone -b 'v2.45.1' https://github.com/git/git.git
> cd git
> autoconf
> automake
> CC="gcc -std=gnu17" ./configure
> time make -j4 all
> time nice make -i test
> ---- snip ----
> 


Thanks for the report. However, I could not reproduce the issue.
The cygwin version is 3.7.0-dev-68-g37c49decc835

There was two problems.

1. automake error
$ automake
configure.ac: error: no proper invocation of AM_INIT_AUTOMAKE was found.
configure.ac: You should verify that configure.ac invokes AM_INIT_AUTOMAKE,
configure.ac: that aclocal.m4 is present in the top-level directory,
configure.ac: and that aclocal.m4 was recently regenerated (using aclocal)
automake-1.17: error: no 'Makefile.am' found for any configure output


2. testsuite runs without hang.

$ cat t1004-read-tree-m-u-wf.counts
total 17
success 16
fixed 0
broken 0
failed 0
missing_prereq ,SANITY


> Process "git merge-recursive branch-point -- side-b side-a" launched
> by "/bin/sh t1004-read-tree-m-u-wf.sh" hangs forever with this stack
> trace:
> ---- snip ----
> Thread 3 (Thread 8148.0x1238 "commune"):
> #0  0x00007ffe68f8d574 in ntdll!ZwWaitForSingleObject () from
> /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> #1  0x00007ffe66b4920e in WaitForSingleObjectEx () from
> /cygdrive/c/Windows/System32/KERNELBASE.dll
> #2  0x00007ffe333c5a82 in cygthread::stub
> (arg=arg AT entry=0x7ffe335b6618 <threads+88>) at
> /usr/src/debug/cygwin-3.7.0-0.68.g37c49decc835/winsup/cygwin/cygthread.cc:194
> #3  0x00007ffe333c6555 in _cygtls::call2 (this=0x5fce00,
> func=0x7ffe333c59de <cygthread::stub(void*)>, arg=0x7ffe335b6618
> <threads+88>, buf=buf AT entry=0x5fcd20) at
> /usr/src/debug/cygwin-3.7.0-0.68.g37c49decc835/winsup/cygwin/cygtls.cc:41
> #4  0x00007ffe333c660a in _cygtls::call (func=<optimized out>,
> arg=<optimized out>) at
> /usr/src/debug/cygwin-3.7.0-0.68.g37c49decc835/winsup/cygwin/cygtls.cc:28
> #5  0x00007ffe66f17374 in KERNEL32!BaseThreadInitThunk () from
> /cygdrive/c/Windows/System32/KERNEL32.DLL
> #6  0x00007ffe68f3cc91 in ntdll!RtlUserThreadStart () from
> /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> #7  0x0000000000000000 in ?? ()

This does not seem to be a signal problem but be a thread creation
problem. I have no idea why and when this happens.

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

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