Falkon crashes... (no messages on screen)

Daily image - tested ("check disk for defects") fine on my usual d610 (laptop), so tried on another system, hp dx6120. (pentium 4, dual core, 1.5gb ram)

There were messages on boot "acpi bios error (bug) \_sb.pcio._..." that I ignored assuming it's an outdated bios or something..., a slower boot (compared d610 laptop), but system was fine once booted. 

Testing had issues only with falkon.  On opening via menu, it would close.
I ran it from terminal, then got messages.
I shutdown system, walked thumb-drive back to d610 & no issues with falkon.

Returned to this hp dx6120, booted
I opened terminal `sudo apt update` (no need, just to confirm it has network etc)
Then opened `falkon` from terminal.

Falkon started - entered `youtube.com` into search; no issues (youtube showed menu)
Searched for 'bloomberg live' on youtube ; got list of matching search videos

On selecting the "Bloomberg Live" stream, the window draws normally, then crash back to terminal.

NOTE: it's not just bloomberg; but appears to be any stream (news live I tried first time)

I `ubuntu-bug` reported on dx6120, but on opening browser to submit; crash again (paste following this) I suspect because falkon would try & continue...  The Qterminal messages were saved (featherpad), saved & `scp` to this box & I'm completing on another box.

I got the error multiple times, multiple boots; different youtube videos - but I only tried youtube.

This is the first test day of lubuntu 18.10 on dx6120

----
lubuntu@lubuntu:~$ falkon
Falkon: Creating new profile directory                                                                                       
Error creating database schema "No query Unable to fetch row"                                                                
Falkon: 1 extensions loaded                                                                                                  
Xlib: sequence lost (0x105a1 > 0x5a5) in reply type 0x0!                                                                     
Received signal 11 SEGV_MAPERR 00000000510d                                                                                  
#0 0x0000b1cf38bb <unknown>                                                                                                  
#1 0x0000b1cf3ec2 <unknown>                                                                                                  
#2 0x0000b1cf44ad <unknown>                                                                                                  
#3 0x0000b7fbed58 ([vdso]+0xd57)                                                                                             
#4 0x0000a6c3efd4 <unknown>                                                                                                  
#5 0x0000a669893f <unknown>                                                                                                  
#6 0x0000a6698c63 <unknown>                                                                                                  
#7 0x0000a66998fa nouveau_pushbuf_kick                                                                                       
#8 0x0000a6c3f0b2 <unknown>                                                                                                  
#9 0x0000a68dfa61 <unknown>
#10 0x0000a671a4f9 <unknown>
#11 0x0000b26721a3 <unknown>
#12 0x0000b28a2fbd <unknown>
#13 0x0000b281c123 <unknown>
#14 0x0000b2847100 <unknown>
#15 0x0000b457ce87 <unknown>
#16 0x0000b458e85e <unknown>
#17 0x0000b45925fa <unknown>
#18 0x0000b45976a3 <unknown>
#19 0x0000b4597775 <unknown>
#20 0x0000b4593acc <unknown>
#21 0x0000b4581370 <unknown>
#22 0x0000b1cf4670 <unknown>
#23 0x0000b1d161a5 <unknown>
#24 0x0000b1d16bb2 <unknown>
#25 0x0000b1d16d86 <unknown>
#26 0x0000b1d19579 <unknown>
#27 0x0000b1d3a338 <unknown>
#28 0x0000b1d5c71f <unknown>
#29 0x0000b1d581ba <unknown>
#30 0x0000af6dafed start_thread
#31 0x0000b6c91a76 clone
  gs: 00000033  fs: 00000000  es: 0000007b  ds: 0000007b
 edi: 02030f50 esi: 054393e4 ebp: 7fe21b30 esp: 95feb320
 ebx: a7348000 edx: 01c16090 ecx: 00000000 eax: 00005101
 trp: 0000000e err: 00000006  ip: a6c3efd4  cs: 00000073
 efl: 00210202 usp: 95feb320  ss: 0000007b
[end of stack trace]
Calling _exit(1). Core file will not be generated.

lubuntu@lubuntu:~$ ubuntu-bug falkon

*** Collecting problem information

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*** To continue, you must visit the following URL:

  https://bugs.launchpad.net/ubuntu/+source/falkon/+filebug/aa556374-c2d0-11e8-b34a-002481e7f48a?

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Falkon: 1 extensions loaded
[3532:3604:0928/034343.178607:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3604:0928/034343.179056:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3604:0928/034343.179369:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3604:0928/034343.182933:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3604:0928/034343.185472:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3604:0928/034343.185813:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3549:0928/034346.053388:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3549:0928/034346.053888:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3549:0928/034346.054182:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3549:0928/034346.057193:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3549:0928/034346.057668:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3549:0928/034346.058034:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
Xlib: sequence lost (0x105d5 > 0x5d7) in reply type 0x0!
[3532:3548:0928/034442.334637:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034442.334719:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034442.334818:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3548:0928/034442.337023:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034442.337099:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034442.337188:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3548:0928/034446.172661:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034446.172761:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034446.172858:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3532:3548:0928/034446.183019:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034446.183120:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3532:3548:0928/034446.183221:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
free(): invalid pointer
Received signal 6
#0 0x0000b1c588bb <unknown>
#1 0x0000b1c58ec2 <unknown>
#2 0x0000b1c594ad <unknown>
#3 0x0000b7f23d58 ([vdso]+0xd57)
#4 0x0000b7f23d41 ([vdso]+0xd40)
#5 0x0000b6b2a512 gsignal
#6 0x0000b6b142b6 abort
#7 0x0000b6b6c74c <unknown>
#8 0x0000b6b735dd <unknown>
#9 0x0000b6b74c4b <unknown>
#10 0x0000b6d50768 operator delete()
#11 0x0000b2819f2e <unknown>
#12 0x0000b281da04 <unknown>
#13 0x0000b279375e <unknown>
#14 0x0000b27937c2 <unknown>
#15 0x0000b27ac100 <unknown>
#16 0x0000b44e1e87 <unknown>
#17 0x0000b44f385e <unknown>
#18 0x0000b44f75fa <unknown>
#19 0x0000b44fc6a3 <unknown>
#20 0x0000b44fc775 <unknown>
#21 0x0000b44f8b4c <unknown>
#22 0x0000b44e6370 <unknown>
#23 0x0000b1c59670 <unknown>
#24 0x0000b1c7b1a5 <unknown>
#25 0x0000b1c7bbb2 <unknown>
#26 0x0000b1c7bd86 <unknown>
#27 0x0000b1c7e579 <unknown>
#28 0x0000b1c9f338 <unknown>
#29 0x0000b1cc171f <unknown>
#30 0x0000b1cbd1ba <unknown>
#31 0x0000af63ffed start_thread
#32 0x0000b6bf6a76 clone
  gs: 00000033  fs: 00000000  es: 0000007b  ds: 0000007b
 edi: 00000000 esi: 00000008 ebp: 966ec0dc esp: 966ec0c0
 ebx: 00000002 edx: 00000000 ecx: 966ec0dc eax: 00000000
 trp: 00000000 err: 00000000  ip: b7f23d41  cs: 00000073
 efl: 00200246 usp: 966ec0c0  ss: 0000007b
[end of stack trace]
Calling _exit(1). Core file will not be generated.
Falkon: 1 extensions loaded
[3623:3639:0928/034535.578254:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3623:3639:0928/034535.578553:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3623:3639:0928/034535.578733:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3623:3639:0928/034535.581082:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3623:3639:0928/034535.581352:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3623:3639:0928/034535.581524:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
falkon: ../../nouveau/pushbuf.c:233: pushbuf_krel: Assertion `pkref' failed.
Received signal 6
#0 0x0000b1c2e8bb <unknown>
#1 0x0000b1c2eec2 <unknown>
#2 0x0000b1c2f4ad <unknown>
#3 0x0000b7ef9d58 ([vdso]+0xd57)
#4 0x0000b7ef9d41 ([vdso]+0xd40)
#5 0x0000b6b00512 gsignal
#6 0x0000b6aea2b6 abort
#7 0x0000b6aea1c1 <unknown>
#8 0x0000b6af8369 __assert_fail
#9 0x0000a65d31d9 <unknown>
#10 0x0000a65d4827 nouveau_pushbuf_reloc
#11 0x0000a6b869e9 <unknown>
#12 0x0000a6b705a4 <unknown>
#13 0x0000a6b707ee <unknown>
#14 0x0000a6ae98eb <unknown>
#15 0x0000a6b7beb9 <unknown>
#16 0x0000a6b83a1b <unknown>
#17 0x0000a6b87126 <unknown>
#18 0x0000a6af0f78 <unknown>
#19 0x0000a6a4b298 <unknown>
#20 0x0000a6827a56 <unknown>
#21 0x0000a67e9453 <unknown>
#22 0x0000a67e9eef <unknown>
#23 0x0000afa4ecee <unknown>
#24 0x0000af9dd472 QPlatformBackingStore::composeAndFlush()
#25 0x0000a809314d <unknown>
#26 0x0000b74c17e4 <unknown>
#27 0x0000b74c341c <unknown>
#28 0x0000b74c472a <unknown>
#29 0x0000b74c48d9 <unknown>
#30 0x0000b74de267 QWidgetPrivate::syncBackingStore()
#31 0x0000b74f85e9 QWidget::event()
#32 0x0000b761879f QMainWindow::event()
#33 0x0000b7ba2c07 BrowserWindow::event()
#34 0x0000b74b4096 QApplicationPrivate::notify_helper()
#35 0x0000b74bbfc9 QApplication::notify()
#36 0x0000b70959da QCoreApplication::notifyInternal2()
#37 0x0000b74c584d <unknown>
#38 0x0000b74c645d <unknown>
#39 0x0000b74e0268 QWidget::repaint()
#40 0x0000b7684da3 QTabBar::mouseReleaseEvent()
#41 0x0000b7cb6915 TabBarHelper::mouseReleaseEvent()
#42 0x0000b74f84ba QWidget::event()
#43 0x0000b7682e9d QTabBar::event()
#44 0x0000b7cb60bd TabBarHelper::event()
#45 0x0000b74b4096 QApplicationPrivate::notify_helper()
#46 0x0000b74bc66e QApplication::notify()
#47 0x0000b70959da QCoreApplication::notifyInternal2()
#48 0x0000b74bb3ac QApplicationPrivate::sendMouseEvent()
#49 0x0000b7516736 <unknown>
#50 0x0000b7519aa1 <unknown>
#51 0x0000b74b4096 QApplicationPrivate::notify_helper()
#52 0x0000b74bbfc9 QApplication::notify()
#53 0x0000b70959da QCoreApplication::notifyInternal2()
#54 0x0000af72ebe8 QGuiApplicationPrivate::processMouseEvent()
#55 0x0000af730d49 QGuiApplicationPrivate::processWindowSystemEvent()
#56 0x0000af706674 QWindowSystemInterface::sendWindowSystemEvents()
#57 0x0000a810935e <unknown>
#58 0x0000b70943d7 QEventLoop::exec()
#59 0x0000b709cd3e QCoreApplication::exec()
#60 0x0000af7249f1 QGuiApplication::exec()
#61 0x0000b74b4004 QApplication::exec()
  gs: 00000033  fs: 00000000  es: 0000007b  ds: 0000007b
 edi: 00000000 esi: 00000008 ebp: bfa8a33c esp: bfa8a320
 ebx: 00000002 edx: 00000000 ecx: bfa8a33c eax: 00000000
 trp: 00000000 err: 00000000  ip: b7ef9d41  cs: 00000073
 efl: 00200246 usp: bfa8a320  ss: 0000007b
[end of stack trace]
Calling _exit(1). Core file will not be generated.
xdg-open: no method available for opening 'https://bugs.launchpad.net/ubuntu/+source/falkon/+filebug/aa556374-c2d0-11e8-b34a-002481e7f48a?'
lubuntu@lubuntu:~$

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: falkon 3.0.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
Uname: Linux 4.18.0-7-generic i686
ApportVersion: 2.20.10-0ubuntu11
Architecture: i386
CasperVersion: 1.396
CurrentDesktop: LXQt
Date: Fri Sep 28 03:42:49 2018
LiveMediaBuild: Lubuntu 18.10 "Cosmic Cuttlefish" - Beta i386 (20180927)
SourcePackage: falkon
UpgradeStatus: No upgrade log present (probably fresh install)