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List:       kde-bugs-dist
Subject:    [ksmserver] [Bug 333877] New: ksmserver stops responding after update, preventing other applications
From:       Matthew Woehlke <mw_triad () users ! sourceforge ! net>
Date:       2014-04-25 16:04:43
Message-ID: bug-333877-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=333877

            Bug ID: 333877
           Summary: ksmserver stops responding after update, preventing
                    other applications from starting
    Classification: Unclassified
           Product: ksmserver
           Version: 4.11.7
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: l.lunak@kde.org
          Reporter: mw_triad@users.sourceforge.net

Every now and then, my KDE session loses the ability to start new applications,
unless I unset $SESSION_MANAGER. Debugging applications indicates that they are
stuck trying to communicate with the session manager (i.e. ksmserver). The
stack trace for ksmserver seems to indicate that it is stuck in a read.

This has happened to me at least three times in the last few months, and seems
to be happening within some hours or days after updating KDE packages.

IIRC it eventually (hours or days later) started working again on one occasion.

Reproducible: Sometimes

Steps to Reproduce:
1. Install some KDE updates (package containing ksmserver seems to be a likely
suspect.)
2. Continue using the system normally for a few days without logging out.
Actual Results:  
At some point, new applications start hanging on startup.


ksmserver's stack:
#0  0x0000003866e0e87d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x000000386aa082e7 in read (__nbytes=418, __buf=0x7ffff8e0b2fe,
__fd=<optimized out>) at /usr/include/bits/unistd.h:44
#2  _IceTransSocketRead (ciptr=0x1dbef30, buf=0x7ffff8e0b2fe "", size=418) at
/usr/include/X11/Xtrans/Xtranssock.c:2116
#3  0x000000386aa0c7d8 in _IceRead (iceConn=iceConn@entry=0x1ec6e20,
nbytes=nbytes@entry=512, ptr=0x7ffff8e0b2fe "", ptr@entry=0x7ffff8e0b2a0
"name=\"GetVariable\"
returntype=\"xml\"><arguments><string>$version</string></arguments></invoke>\n")
at misc.c:228
#4  0x000000386aa0c92c in _IceReadSkip (iceConn=iceConn@entry=0x1ec6e20,
nbytes=53173112) at misc.c:324
#5  0x000000386aa109a7 in IceProcessMessages (iceConn=0x1ec6e20, replyWait=0x0,
replyReadyRet=0x0) at process.c:366
#6  0x0000003bbe216926 in KSMServer::processData (this=0x1e1eb40) at
/usr/src/debug/kde-workspace-4.11.8/ksmserver/server.cpp:790
#7  0x0000003bbe21b43b in KSMServer::qt_static_metacall (_o=0x1e1eb40,
_id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at
/usr/src/debug/kde-workspace-4.11.8/x86_64-redhat-linux-gnu/ksmserver/server.moc:116
#8  0x0000003870798cf8 in QMetaObject::activate (sender=sender@entry=0x1dc37f0,
m=m@entry=0x3870ae8960 <QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffff8e0b6e0)
at kernel/qobject.cpp:3547
#9  0x00000038707e649e in QSocketNotifier::activated
(this=this@entry=0x1dc37f0, _t1=75) at
.moc/release-shared/moc_qsocketnotifier.cpp:102
#10 0x00000038707a1f2b in QSocketNotifier::event (this=0x1dc37f0,
e=0x7ffff8e0ba70) at kernel/qsocketnotifier.cpp:316

Example stack from another application:
#0  0x0000003866e0e860 in __read_nocancel () at
../sysdeps/unix/syscall-template.S:81
#1  0x000000386aa082e7 in read (__nbytes=8, __buf=0x718620, __fd=<optimized
out>) at /usr/include/bits/unistd.h:44
#2  _IceTransSocketRead (ciptr=0x6d6500, buf=0x718620 "0\256p", size=8) at
/usr/include/X11/Xtrans/Xtranssock.c:2116
#3  0x000000386aa0c7d8 in _IceRead (iceConn=iceConn@entry=0x6d57f0,
nbytes=nbytes@entry=8, ptr=0x718620 "0\256p")
    at misc.c:228
#4  0x000000386aa108d0 in IceProcessMessages (iceConn=iceConn@entry=0x6d57f0,
replyWait=replyWait@entry=0x0, 
    replyReadyRet=replyReadyRet@entry=0x0) at process.c:196
#5  0x000000386aa06094 in IceOpenConnection (
    networkIdsList=networkIdsList@entry=0x7fffffffe177
"local/unix:@/tmp/.ICE-unix/11626,unix/unix:/tmp/.ICE-unix/11626",
context=context@entry=0x0, mustAuthenticate=mustAuthenticate@entry=0,
majorOpcodeCheck=<optimized out>, 
    errorLength=errorLength@entry=256,
errorStringRet=errorStringRet@entry=0x7fffffffd410 "") at connect.c:258
#6  0x0000003b81c01e7f in SmcOpenConnection (networkIdsList=<optimized out>,
context=0x0, 
    xsmpMajorRev=<optimized out>, xsmpMinorRev=<optimized out>, mask=15,
callbacks=0x7fffffffd3d0, 
    previousId=0x6498b8 "", clientIdRet=0x7fffffffd3c8, errorLength=256,
errorStringRet=0x7fffffffd410 "")
    at sm_client.c:135
#7  0x00000039fec357b5 in QSessionManager::QSessionManager (this=0x6e1c60,
app=<optimized out>, id="", key=...)
    at kernel/qapplication_x11.cpp:5928
#8  0x00000039febcda31 in QApplicationPrivate::initialize
(this=this@entry=0x653c10) at kernel/qapplication.cpp:1004

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