X server crash when running texworks

Sat Mar 31 15:27:00 GMT 2012

On 3/31/2012 6:28 AM, Jon TURNEY wrote:
> On 30/03/2012 12:36, Jon TURNEY wrote:
>> On 29/03/2012 20:59, Ken Brown wrote:
>>> On 3/29/2012 8:14 AM, Jon TURNEY wrote:
>>>>
>>>> Not so good :-(.  Thanks for testing it, anyway.
>>>>
>>>> I found a rather bad crash bug I'd introduced and fixed that, so you might
>>>> want to try today's snapshot [1], but I'm not confident that I fixed the
>>>> problem you saw, so a backtrace would be helpful if you still get crashes.
>>>
>>> OK, I'm running it now and have attached gdb to it.  The good news is that
>>> I've been running it for a couple hours with no crash, and I've used texworks
>>> and have opened many tex files and pdf files in it without a problem.  The bad
>>> news is that texworks becomes unresponsive and has to be killed whenever I try
>>> to compile a tex file.  I have no idea whether this is due to an X server
>>> problem or something completely different.  Anyway, I'll post a backtrace if
>>> the server crashes.
>>>
>>> In case you want to try to reproduce the current problem, start texworks, open
>>> a tex file (such as the file test1.tex whose contents I listed at the
>>> beginning of this thread), and click on the icon at the left end of the
>>> toolbar (brown triangle on a green background).  This is supposed to cause
>>> test1.tex to get compiled, but for me it just causes texworks to become
>>> unresponsive.  This was working properly with the previous version of the X
>>> server (until the server crashed).
>>
>> Thanks for testing this X server snapshot.
>>
>> For me, the problem of texworks hanging only occurs very intermittently.  It
>> seems to be blocked deep in QtCore, waiting for the spawned process to
>> terminate (which has already happened).
>
> Attaching to the texworks process, I get a backtrace like this:
>
> (gdb) bt
> #0  0x7c90e514 in ntdll!LdrAccessResource () from
> /cygdrive/c/WINDOWS/system32/ntdll.dll
> #1  0x7c90df4a in ntdll!ZwWaitForMultipleObjects () from
> /cygdrive/c/WINDOWS/system32/ntdll.dll
> #2  0x7c809590 in KERNEL32!CreateFileMappingA () from
> /cygdrive/c/WINDOWS/system32/kernel32.dll
> #3  0x7c80a115 in WaitForMultipleObjects () from
> /cygdrive/c/WINDOWS/system32/kernel32.dll
> #4  0x610ce614 in select_stuff::wait(_types_fd_set*, _types_fd_set*,
> _types_fd_set*, unsigned long) ()
>     from /usr/bin/cygwin1.dll
> #5  0x610cf02b in cygwin_select () from /usr/bin/cygwin1.dll
> #6  0x610d33d5 in _sigfe () from /usr/bin/cygwin1.dll
> #7  0x0022b87c in ?? ()
> #8  0x6d445820 in cygQtCore-4!_ZN15QProcessManager11qt_metacastEPKc () from
> /usr/bin/cygQtCore-4.dll
> #9  0x6d446e97 in cygQtCore-4!_ZN15QProcessPrivate15waitForFinishedEi () from
> /usr/bin/cygQtCore-4.dll
> #10 0x6d40fb85 in cygQtCore-4!_ZN8QProcess15waitForFinishedEi () from
> /usr/bin/cygQtCore-4.dll
> #11 0x6d41286c in cygQtCore-4!_ZN8QProcess7executeERK7QStringRK11QStringList
> () from /usr/bin/cygQtCore-4.dll
> #12 0x0043a350 in ?? ()
> #13 0x0047b8c5 in ?? ()
> #14 0x6d46e733 in cygQtCore-4!_ZN11QMetaObject8activateEP7QObjectPKS_iPPv ()
> from /usr/bin/cygQtCore-4.dll
> #15 0x6bc8b99b in cygQtGui-4!_ZN7QAction9triggeredEb () from
> /usr/bin/cygQtGui-4.dll
> #16 0x6bc8bb9a in cygQtGui-4!_ZN7QAction8activateENS_11ActionEventE () from
> /usr/bin/cygQtGui-4.dll
> #17 0x6c08dd06 in cygQtGui-4!_ZN11QToolButton14nextCheckStateEv () from
> /usr/bin/cygQtGui-4.dll
> #18 0x6bfe0185 in cygQtGui-4!_ZN22QAbstractButtonPrivate5clickEv () from
> /usr/bin/cygQtGui-4.dll
> #19 0x6bfe0426 in
> cygQtGui-4!_ZN15QAbstractButton17mouseReleaseEventEP11QMouseEvent () from
> /usr/bin/cygQtGui-4.dll
> #20 0x6c08ddac in
> cygQtGui-4!_ZN11QToolButton17mouseReleaseEventEP11QMouseEvent () from
> /usr/bin/cygQtGui-4.dll
> #21 0x6bcd8769 in cygQtGui-4!_ZN7QWidget5eventEP6QEvent () from
> /usr/bin/cygQtGui-4.dll
> #22 0x6bc90fec in
> cygQtGui-4!_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent () from
> /usr/bin/cygQtGui-4.dll
> #23 0x6bc95e45 in cygQtGui-4!_ZN12QApplication6notifyEP7QObjectP6QEvent ()
> from /usr/bin/cygQtGui-4.dll
> #24 0x6d45cefd in
> cygQtCore-4!_ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent () from
> /usr/bin/cygQtCore-4.dll
> #25 0x6bc91d98 in
> cygQtGui-4!_ZN19QApplicationPrivate14sendMouseEventEP7QWidgetP11QMouseEventS1_S1_PS1_R8QPointerIS0_Eb
>      () from /usr/bin/cygQtGui-4.dll
> #26 0x6bd007ed in cygQtGui-4!_ZN9QETWidget19translateMouseEventEPK7_XEvent ()
> from /usr/bin/cygQtGui-4.dll
> #27 0x6bcff421 in cygQtGui-4!_ZN12QApplication15x11ProcessEventEP7_XEvent ()
> from /usr/bin/cygQtGui-4.dll
> #28 0x6bd21f82 in cygQtGui-4!_ZN23QGuiEventDispatcherGlibC2EP7QObject () from
> /usr/bin/cygQtGui-4.dll
> #29 0x5efecb08 in g_main_context_dispatch () from /usr/bin/cygglib-2.0-0.dll
> #30 0x5efed208 in g_main_context_dispatch () from /usr/bin/cygglib-2.0-0.dll
> #31 0x5efed3cf in g_main_context_iteration () from /usr/bin/cygglib-2.0-0.dll
> #32 0x6d480671 in
> cygQtCore-4!_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
> ()
>     from /usr/bin/cygQtCore-4.dll
> #33 0x6bd21cb7 in
> cygQtGui-4!_ZN23QGuiEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
> ()
>     from /usr/bin/cygQtGui-4.dll
> #34 0x6d45c587 in
> cygQtCore-4!_ZN10QEventLoop13processEventsE6QFlagsINS_17ProcessEventsFlagEE ()
>     from /usr/bin/cygQtCore-4.dll
> #35 0x6d45c7f7 in
> cygQtCore-4!_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE () from
> /usr/bin/cygQtCore-4.dll
> #36 0x6d4605d6 in cygQtCore-4!_ZN16QCoreApplication4execEv () from
> /usr/bin/cygQtCore-4.dll
> #37 0x00402bbe in ?? ()
> #38 0x61006d68 in _cygwin_exit_return () from /usr/bin/cygwin1.dll
> #39 0x00000001 in ?? ()
> #40 0x20010100 in ?? ()
> #41 0x00000000 in ?? ()
>
> I'm guessing this is waiting for the pdftex process to terminate, but ps shows
> it as '(defunct)' already...

I wanted to do some further tests, but I thought I should install the 
latest Cygwin snapshot (2012-03-30) first.  With that Cygwin snapshot, 
the XWin snapshot of 20120329 won't start.  It hangs while displaying 
the xterm window.  I attached gdb to it at that point, but when I then 
clicked on the title bar of the xterm window (which was still not fully 
displayed), XWin exited:

(gdb) c
Continuing.
[Inferior 1 (process 3256) exited with code 031777777777]
(gdb) bt full
No stack.

Ken

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