https://bugs.kde.org/show_bug.cgi?id=357200
Bug ID: 357200
Summary: Immediate crash followed by log in screen.
Precipitated possibly by use of video, but cannot
consistently reproduce conditions
Product: kwin
Version: 5.4.2
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: activities
Assignee: kwin-bugs-n...@kde.org
Reporter: supp...@asiadigitalprivacy.net
Since upgrading to Kubuntu 15.10 this crash seems to occur with regularity when
pausing or fast forwarding a video. However, I have suffered the same crash
(possibly different root causes?) when doing other mundane tasks such as
clicking the task bar. Samples from dmesg below. I do not think the wlan0
activity is related to the segmentation fault.
[ 6592.767741] wlan0: authenticated
[ 6592.769570] wlan0: associate with 30:91:8f:79:1c:31 (try 1/3)
[ 6592.773267] wlan0: RX AssocResp from 30:91:8f:79:1c:31 (capab=0x411 status=0
aid=3)
[ 6592.794517] wlan0: associated
[ 7818.438647] kactivitymanage[1716]: segfault at 7fb3ddf89cd0 ip
00007fb3b7da51b1 sp 00007ffea6f56208 error 4 in
libQt5Sql.so.5.4.2[7fb3b7d91000+3f000]
[ 7819.384802] wlan0: deauthenticating from 30:91:8f:79:1c:31 by local choice
(Reason: 3=DEAUTH_LEAVING)
[ 7819.419809] cfg80211: World regulatory domain updated:
[ 7819.419820] cfg80211: DFS Master region: unset
[ 7819.419824] cfg80211: (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp), (dfs_cac_time)
[ 7819.419833] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000
mBm), (N/A)
[ 7819.419839] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000
mBm), (N/A)
[ 7819.419845] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000
mBm), (N/A)
[ 7819.419853] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz
AUTO), (N/A, 2000 mBm), (N/A)
[ 7819.419860] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz
AUTO), (N/A, 2000 mBm), (0 s)
[ 7819.419867] cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000
mBm), (0 s)
[ 7819.419873] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000
mBm), (N/A)
[ 7819.419879] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0
mBm), (N/A)
[ 7831.097309] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 7833.677084] audit: type=1400 audit(1451188634.449:63): apparmor="DENIED"
operation="open" profile="/usr/lib/telepathy/mission-control-5"
name="/home/nate7809/.config/dconf/user" pid=8450 comm="mission-control"
requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[ 7866.987120] wlan0: authenticate with 30:91:8f:79:1c:31
[ 7866.989637] wlan0: send auth to 30:91:8f:79:1c:31 (try 1/3)
[ 7866.992988] wlan0: authenticated
[ 7866.996321] wlan0: associate with 30:91:8f:79:1c:31 (try 1/3)
[ 7867.000083] wlan0: RX AssocResp from 30:91:8f:79:1c:31 (capab=0x411 status=0
aid=1)
[ 7867.019947] wlan0: associated
[ 7867.020013] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 8021.631624] kactivitymanage[8468]: segfault at 7fd1d8a8acd0 ip
00007fd1c80c01b1 sp 00007ffe019362f8 error 4 in
libQt5Sql.so.5.4.2[7fd1c80ac000+3f000]
Reproducible: Always
Steps to Reproduce:
1. Open / log in to PC as normal
2. Utilise KDE + any video player (I have experienced the fault with both VLC
and Amarok, so there is reason to believe it is non-application specific - this
is KDE-specific)
3. Use controls to pause, forward, rewind, or change volume of the video
Note: I have experienced the segmentation faults when clicking in KDE as well
but not as frequently
Actual Results:
immediate crash screen goes black followed by instantaneous log in offer back
into Kwin (strange - there does not appear to be any full reboot, just a
complete crash of Kwin and log back into Kwin. suspect this is only the
desktop environment that crashes
Expected Results:
Should have behaved normally
I searched for crashes related to the package named in dmesg,
libQt5Sql.so.5.4.2. It is claimed in some threads that "fixes" have already
been implemented for libQt5Sql.so.5.4.2. These fixes are likely to be
incomplete or address a different underlying cause for the segmentation faults.
I am doubtful that I am the only user experiencing this as anecdotal forum
posts seem to indicate a higher degree of crashing post upgrade. Please note I
was on Kubuntu 15.04 prior to 15.10 and experienced no crashes for at least the
prior 6 months on the same hardware and same software and same profile. This
is related to the upgrade.
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