Mail Archives: cygwin/2012/06/03/08:55:20
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| Date: | Sun, 03 Jun 2012 08:54:20 -0400
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| From: | Ken Brown <kbrown AT cornell DOT edu>
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| To: | cygwin AT cygwin DOT com
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| Subject: | Re: "emacs -nw" hangs in a terminal
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| X-Original-Sender: | kbrown AT cornell DOT edu - Sun Jun 3 08:54:51 2012
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On 6/2/2012 11:08 PM, Christopher Faylor wrote:
> On Fri, May 25, 2012 at 04:07:32PM -0400, Ken Brown wrote:
>> On 5/25/2012 2:49 PM, Ken Brown wrote:
>>> On 5/25/2012 10:35 AM, Corinna Vinschen wrote:
>>>> I applied a patch which calls the signal handler after cleanup. The
>>>> downside is that the signal handler is only called if select is called
>>>> from the main thread. A better patch would perhaps be to stop all
>>>> threads, call the signal handler, and restart the threads afterwards,
>>>> but this is more tricky.
>>>
>>> Thanks! That fixes it. I appreciate all your work on this.
>>>
>>> I'm in the process now of testing to see if this also fixes an emacs
>>> crash I've been getting when I build emacs with GSettings support
>>> (http://cygwin.com/ml/cygwin-xfree/2012-04/msg00048.html).
>>
>> Here's what I'm now seeing with that build. If I start emacs and do
>> 'M-x shell', emacs hangs (but doesn't crash). Attaching gdb and doing a
>> backtrace of all threads, I see that cygwin_select has been called in
>> two threads other than the main one:
>>
>> Thread 8 (Thread 2784.0x19c):
>> #0 0x7702013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
>> from /c/windows/SysWOW64/ntdll.dll
>> #1 0x7702013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
>> from /c/windows/SysWOW64/ntdll.dll
>> #2 0x74fe0bdd in WaitForMultipleObjectsEx ()
>> from /c/windows/syswow64/KERNELBASE.dll
>> #3 0x00000004 in ?? ()
>> #4 0x74ed1a2c in KERNEL32!GetVolumePathNamesForVolumeNameA ()
>> from /c/windows/syswow64/kernel32.dll
>> #5 0xff11c868 in ?? ()
>> #6 0x74ed4208 in KERNEL32!CheckForReadOnlyResource ()
>> from /c/windows/syswow64/kernel32.dll
>> #7 0x00000004 in ?? ()
>> #8 0x610d0b24 in select_stuff::wait (this=0xff11cba4, readfds=0xff11cb00,
>> writefds=0xff11cae0, exceptfds=0xff11cac0, ms=4294967295)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/select.cc:320
>> #9 0x610d154b in cygwin_select (maxfds=13, readfds=0xff11cc70,
>> writefds=0xff11cc50, exceptfds=0xff11cc30, to=0x0)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/select.cc:158
>> #10 0x610b2b5a in poll (fds=0x8012db00, nfds=3, timeout=-1)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/poll.cc:87
>> #11 0x610d5575 in _sigfe () from /usr/bin/cygwin1.dll
>> #12 0xffffffff in ?? ()
>> #13 0x8012db00 in ?? ()
>> #14 0x6ac1e759 in g_main_loop_run () from /usr/bin/cygglib-2.0-0.dll
>> #15 0x6ad96d40 in g_dbus_proxy_call_with_unix_fd_list_sync ()
>> from /usr/bin/cyggio-2.0-0.dll
>> #16 0x6ac401ef in g_thread_proxy () from /usr/bin/cygglib-2.0-0.dll
>> #17 0x610fca42 in pthread::thread_init_wrapper (arg=0x80130e00)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/thread.cc:2104
>> #18 0x61086f62 in thread_wrapper (arg=0x0)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/miscfuncs.cc:547
>> #19 0x00000000 in ?? ()
>>
>> Thread 7 (Thread 2784.0xb4c):
>> #0 0x7702013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
>> from /c/windows/SysWOW64/ntdll.dll
>> #1 0x7702013d in ntdll!RtlEnableEarlyCriticalSectionEventCreation ()
>> from /c/windows/SysWOW64/ntdll.dll
>> #2 0x74fe0bdd in WaitForMultipleObjectsEx ()
>> from /c/windows/syswow64/KERNELBASE.dll
>> #3 0x00000003 in ?? ()
>> #4 0x74ed1a2c in KERNEL32!GetVolumePathNamesForVolumeNameA ()
>> from /c/windows/syswow64/kernel32.dll
>> #5 0xff21c858 in ?? ()
>> #6 0x74ed4208 in KERNEL32!CheckForReadOnlyResource ()
>> from /c/windows/syswow64/kernel32.dll
>> #7 0x00000003 in ?? ()
>> #8 0x610d0b24 in select_stuff::wait (this=0xff21cb94, readfds=0xff21caf0,
>> writefds=0xff21cad0, exceptfds=0xff21cab0, ms=4294967295)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/select.cc:320
>> #9 0x610d154b in cygwin_select (maxfds=8, readfds=0xff21cc60,
>> writefds=0xff21cc40, exceptfds=0xff21cc20, to=0x0)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/select.cc:158
>> #10 0x610b2b5a in poll (fds=0x8009b3c0, nfds=1, timeout=-1)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/poll.cc:87
>> #11 0x610d5575 in _sigfe () from /usr/bin/cygwin1.dll
>> #12 0xffffffff in ?? ()
>> #13 0x8009b3c0 in ?? ()
>> #14 0x6ac1e759 in g_main_loop_run () from /usr/bin/cygglib-2.0-0.dll
>> #15 0x63e32eca in gvdb_table_walk ()
>> from /usr/lib/gio/modules/cygdconfsettings.dll
>> #16 0x6ac401ef in g_thread_proxy () from /usr/bin/cygglib-2.0-0.dll
>> #17 0x610fca42 in pthread::thread_init_wrapper (arg=0x8009c700)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/thread.cc:2104
>> #18 0x61086f62 in thread_wrapper (arg=0x0)
>> at
>> /ext/build/netrel/src/cygwin-snapshot-20120525-1/winsup/cygwin/miscfuncs.cc:547
>> #19 0x00000000 in ?? ()
>>
>> It looks like these threads are being used by GLib, which is running a
>> loop that calls poll, which calls cygwin_select. So maybe the "better
>> patch" that you referred to would fix this hang.
>
> Ken, can you confirm/deny that the changes that I just made to select()
> at least still work as well as Corinna's temporary (that's what the
> ChangeLog says at least) change above? They are in the latest snapshot.
No, they don't. There's no crash, but I'm seeing two problems in emacs
and a problem with the X server. My emacs tests were done with emacs-24
in mintty on 64-bit Windows 7. I wanted to test it under X also, but I
couldn't because of the X server problem.
1. When I type into emacs, it's very slow to echo the keystrokes and
respond.
2. When I start a shell under emacs (<Alt-X>shell<return>), the shell
doesn't finish initializing. It doesn't display a prompt, and it
doesn't execute commands I type.
3. If I start the X server using the Start Menu shortcut, startxwin
never finishes, and the xterm window doesn't display. I have to kill
startxwin from a terminal.
Ken
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