Re: Problems with Windows, Was: What's cooking in git.git (May 2013, #01; Fri, 3)

[Tay Ray Chuan <rctay89@gmail.com>]

On Wed, May 15, 2013 at 3:37 AM, Torsten Bögershausen <tboegi@web.de> wrote:
> Second,
> I was able to do some testing.
> The hanging is not 100% reproducable, and I had one hanging in Git 1.8.1
>
> Turning the screen saver off in Win XP helps that the machine reacts,
> and using process explorer showed that the hanging is happening
> in test cases doing "git fetch" (or git pull) from a local repository.
> What I can see is one git-fetch.exe together with git-upload-pack.exe

I also managed to run into the intermittent hanging of git-fetch when
running t5510. What I do is keep running the test till it stalls:

  while [ $? -eq 0 ]; do date; ./t5510-fetch.sh -i -v; done

Almost always the git-fetch output looks like this:

  remote: Counting objects: 7, done.
  remote: Compressing objects: 100% (5/5), done.
  remote: Total 6 (delta 1), reused 0 (delta 0)

However my task manager indicates that git-upload-pack or whatever
that runs on the remote side is absent, only git-fetch is waiting - 0
I/O, 0 cswitches, nilda. I tried getting a gdb backtrace but I get ???
nonsense, despite having compiled git with `-g -O0`. I also noticed
there were a couple of threads. This is my gdb session:

$ gdb --pid=7936
GNU gdb (GDB) 7.6.50.20130508-cvs (cygwin-special)
...
Attaching to process 7936
[New Thread 7936.0x1c7c]
[New Thread 7936.0x6b8]
[New Thread 7936.0xd20]
[New Thread 7936.0x1cf8]
[New Thread 7936.0x1b24]
Reading symbols from /cygdrive/f/files/coding/git/git.exe...done.
(gdb) info thread
  Id   Target Id         Frame
* 5    Thread 7936.0x1b24 0x77c5000d in ntdll!DbgBreakPoint ()
   from /cygdrive/c/Windows/SysWOW64/ntdll.dll
  4    Thread 7936.0x1cf8 0x77c5f8b1 in ntdll!ZwWaitForSingleObject ()
   from /cygdrive/c/Windows/SysWOW64/ntdll.dll
  3    Thread 7936.0xd20 0x77c5f91d in ntdll!ZwWriteFile ()
   from /cygdrive/c/Windows/SysWOW64/ntdll.dll
  2    Thread 7936.0x6b8 0x77c5f8b1 in ntdll!ZwWaitForSingleObject ()
   from /cygdrive/c/Windows/SysWOW64/ntdll.dll
  1    Thread 7936.0x1c7c 0x77c5f8b1 in ntdll!ZwWaitForSingleObject ()
   from /cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0  0x77c5000d in ntdll!DbgBreakPoint () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1  0x77cdf896 in ntdll!DbgUiRemoteBreakin () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2  0x775c5cca in ?? ()
#3  0x00000000 in ?? ()
(gdb) thread 4
[Switching to thread 4 (Thread 7936.0x1cf8)]
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2  0x7573149d in WaitForSingleObjectEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3  0x00000148 in ?? ()
#4  0x00000000 in ?? ()
(gdb) thread 3
[Switching to thread 3 (Thread 7936.0xd20)]
#0  0x77c5f91d in ntdll!ZwWriteFile () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0  0x77c5f91d in ntdll!ZwWriteFile () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1  0x77c5f91d in ntdll!ZwWriteFile () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2  0x7572dec1 in WriteFile () from /cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3  0x0000009c in ?? ()
#4  0x00000000 in ?? ()
(gdb) thread 2
[Switching to thread 2 (Thread 7936.0x6b8)]
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2  0x7573149d in WaitForSingleObjectEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3  0x0000001c in ?? ()
#4  0x00000000 in ?? ()
(gdb) thread 1
[Switching to thread 1 (Thread 7936.0x1c7c)]
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1  0x77c5f8b1 in ntdll!ZwWaitForSingleObject () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2  0x7573149d in WaitForSingleObjectEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3  0x00000034 in ?? ()
#4  0x00000000 in ?? ()

--
Cheers,
Ray Chuan

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