Desktop: Linux client crashes due to WebGL

[aleho]

The setup process seems to have hardware acceleration enabled, though it is blacklisted?

Nouveau drivers don't seem ready for WebGL (and probably never will be), so I'm asking: Is acceleration actually needed? (Or is this crash not related to acceleration?)

[22592:22630:0903/204947.762749:ERROR:context_group.cc(137)] ContextResult::kFatalFailure: WebGL1 blacklisted
[22592:22630:0903/204947.764893:ERROR:context_group.cc(137)] ContextResult::kFatalFailure: WebGL1 blacklisted
Received signal nouveau: kernel rejected pushbuf: Das Argument ist ungültig
11 SEGV_MAPERR nouveau: ch15: krec 0 pushes 1 bufs 15 relocs 0
000000000008
nouveau: ch15: buf 00000000 00000004 00000004 00000004 00000000
nouveau: ch15: buf 00000001 00000004 00000004 00000004 00000000
nouveau: ch15: buf 00000002 00000007 00000002 00000002 00000000
nouveau: ch15: buf 00000003 00000008 00000002 00000002 00000000
nouveau: ch15: buf 00000004 00000008 00000002 00000002 00000000
nouveau: ch15: buf 00000005 0000000b 00000002 00000002 00000000
nouveau: ch15: buf 00000006 0000000b 00000002 00000002 00000000
nouveau: ch15: buf 00000007 0000000a 00000002 00000002 00000002
nouveau: ch15: buf 00000008 00000006 00000004 00000000 00000004
nouveau: ch15: buf 00000009 00000016 00000002 00000000 00000002
nouveau: ch15: buf 0000000a 00000023 00000002 00000000 00000002
nouveau: ch15: buf 0000000b 00000023 00000002 00000000 00000002
nouveau: ch15: buf 0000000c 00000034 00000002 00000002 00000000
nouveau: ch15: buf 0000000d 0000004b 00000002 00000002 00000000
nouveau: ch15: buf 0000000e 0000004b 00000002 00000002 00000000
nouveau: ch15: psh 00000001 000002c0b8 000002d8dc
nouveau:    0x80000671
…

[camilasan]

Hi! Which version of the client are you running?

[aleho]

Latest 2.5, nightly build (and also built from source due to other bug I wanted to investigate).

[japhir]

I have this same issue, similar looking errors sometimes.
Also on nouveau drivers, on Arch Linux.
Running:

Nextcloud version 2.5.1git
Git revision b37cbea5cc12b01d9baa0e36a996c873acdeea00
Using Qt 5.11.2, built against Qt 5.11.2
Using 'OpenSSL 1.1.1a  20 Nov 2018'

I also get different issues where I can log in, but it crashes as soon as I click on my institution:

λ archdesk ~ → nextcloud
[3893:3923:1209/170006.639298:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.639334:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.639369:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3893:3923:1209/170006.640470:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.640496:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.640524:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3893:3923:1209/170006.710355:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.710406:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.710448:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3893:3923:1209/170006.711517:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.711553:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170006.711594:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3893:3923:1209/170007.217471:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170007.217501:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170007.217526:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
[3893:3923:1209/170007.218570:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170007.218585:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: ocsp.digicert.com
[3893:3923:1209/170007.218607:ERROR:nss_ocsp.cc(614)] No URLRequestContext for NSS HTTP handler. host: crl4.digicert.com
nextcloud: ../libdrm-2.4.96/nouveau/pushbuf.c:723: nouveau_pushbuf_data: Assertion `kref' failed.
Received signal 6
#0 0x7f1b4d3a9bee <unknown>
#1 0x7f1b4d3a9d00 <unknown>
#2 0x7f1b4d3aa337 <unknown>
#3 0x7f1b4709ce00 <unknown>
#4 0x7f1b4709cd7f __GI_raise
#5 0x7f1b47087672 __GI_abort
#6 0x7f1b47087548 __assert_fail_base.cold.0
#7 0x7f1b47095396 __GI___assert_fail
#8 0x7f1b365aded0 nouveau_pushbuf_data
#9 0x7f1b365ade33 nouveau_pushbuf_data
#10 0x7f1b365adf68 <unknown>
#11 0x7f1b365aeb7f <unknown>
#12 0x7f1b365afba0 nouveau_pushbuf_kick
#13 0x7f1b36914627 <unknown>
#14 0x7f1b36a95400 <unknown>
#15 0x7f1b36671b27 <unknown>
#16 0x7f1b37802ab3 <unknown>
#17 0x7f1b397c9719 <unknown>
#18 0x7f1b47baf030 QOpenGLContext::swapBuffers()
#19 0x7f1b47e48788 QPlatformBackingStore::composeAndFlush()
#20 0x7f1b396661b6 <unknown>
#21 0x7f1b4814f811 <unknown>
#22 0x7f1b481512c5 <unknown>
#23 0x7f1b48152688 <unknown>
#24 0x7f1b48152829 <unknown>
#25 0x7f1b48169f77 QWidgetPrivate::syncBackingStore()
#26 0x7f1b48182799 QWidget::event()
#27 0x7f1b48142e14 QApplicationPrivate::notify_helper()
#28 0x7f1b4814a6e1 QApplication::notify()
#29 0x7f1b477c8c39 QCoreApplication::notifyInternal2()
#30 0x7f1b48153712 <unknown>
#31 0x7f1b48154459 <unknown>
#32 0x7f1b4816bcd9 QWidget::repaint()
#33 0x7f1b4816bd3d QWidget::repaint()
#34 0x7f1b482cc4a9 QProgressBar::setValue()
#35 0x7f1b477f2bd0 QMetaObject::activate()
#36 0x7f1b51a77be2 QWebEngineView::loadProgress()
#37 0x7f1b477f2bd0 QMetaObject::activate()
#38 0x7f1b51a666f2 QWebEnginePage::loadProgress()
#39 0x7f1b4be4c305 <unknown>
#40 0x7f1b4be4f5ea <unknown>
#41 0x7f1b4c911569 <unknown>
#42 0x7f1b4c632a68 <unknown>
#43 0x7f1b4c632bb8 <unknown>
#44 0x7f1b4c634413 <unknown>
#45 0x7f1b4c63729a <unknown>
#46 0x7f1b4c63a7d1 <unknown>
#47 0x7f1b4c64d467 <unknown>
#48 0x7f1b4bfbd1d0 <unknown>
#49 0x7f1b4dc29d7d <unknown>
#50 0x7f1b4dc62a19 <unknown>
#51 0x7f1b4dc624fe <unknown>
#52 0x7f1b4d3aa698 <unknown>
#53 0x7f1b4d3caefa <unknown>
#54 0x7f1b4d3cb9af <unknown>
#55 0x7f1b4d3cbb2a <unknown>
#56 0x7f1b4bde662d <unknown>
#57 0x7f1b477f330b QObject::event()
#58 0x7f1b48142e14 QApplicationPrivate::notify_helper()
#59 0x7f1b4814a6e1 QApplication::notify()
#60 0x7f1b477c8c39 QCoreApplication::notifyInternal2()
#61 0x7f1b477cbccc QCoreApplicationPrivate::sendPostedEvents()
  r8: 0000000000000000  r9: 00007fff97d47a50 r10: 0000000000000008 r11: 0000000000000246
 r12: 00007f1b365b1000 r13: 00007f1b365b1171 r14: 00000000000002d3 r15: 0000000000000000
  di: 0000000000000002  si: 00007fff97d47a50  bp: 00007f1b471eceb8  bx: 0000000000000006
  dx: 0000000000000000  ax: 0000000000000000  cx: 00007f1b4709cd7f  sp: 00007fff97d47a50
  ip: 00007f1b4709cd7f efl: 0000000000000246 cgf: 002b000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.

[Blaimi]

This workaround helps:

QT_XCB_FORCE_SOFTWARE_OPENGL=1 nextcloud