Re: X server crash when running texworks

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

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'm not sure how the X server changes could directly cause that to happen.
> 
> For me, it usually completes running the spawned pdftext, but that reports the
> error "! I can't find file `test1.tex'."
> 
> A word about why the icons look so bad: The _NET_WM_ICON icons that texworks
> has are only provided in 128x128 and 512x512 sizes, which we then have to
> scale down to 32x32.  I'm not sure if these icons aren't too large to be
> useful anywhere! :-)

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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