Crash while attempting to use mesh

[geofffox]

Describe the bug

How to Reproduce

QGIS and OS versions

Additional context

User Feedback

Trying to use MESH with a grib file. When I went to move the view it crashed consistently.

Report Details

Crash ID: b2b81183c8543b4e5f2b1c4304e743aa65c3ead2

Stack Trace

QgsMeshLayer::writeXml :
QgsSingleBandPseudoColorRenderer::block :
QgsMeshUtils::exportRasterBlock :
QgsMeshUtils::exportRasterBlock :
QgsMapRendererCustomPainterJob::doRender :
QgsMapRendererCustomPainterJob::staticRender :
QgsMapRendererCustomPainterJob::renderSynchronously :
QThreadPoolPrivate::reset :
QThread::start :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.8.2-Zanzibar
QGIS code revision: 4470baa
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 2.4.1
Running against GDAL: 2.4.1

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.18362

[saberraz]

Do you have an example file (a link maybe)?

[geofffox]

Since I use these locally, I've placed a few in a Google drive folder. Otherwise it's a moving target as files are added and deleted over time. These are from the HRRR weather model. The domain is around the Continental US. https://drive.google.com/open?id=1yxGmgp6AkUJiBlbkf5Z7CEQVXfGz2uhS Thanks for your help. Geoff

…

On Sun, Sep 15, 2019 at 4:35 AM Sab ***@***.***> wrote: Do you have an example file (a link maybe)? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#31773?email_source=notifications&email_token=AA5MGNOROKKMGX5KVYYSZZLQJYMZBA5CNFSM4IW2B7KKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD6XO6FA#issuecomment-531558164>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA5MGNJANSMICI5NUURKX7DQJYMZBANCNFSM4IW2B7KA> .

[saberraz]

Hi @geofffox
What version of QGIS are you using?, ok, let me check 3.8

It works fine with my nightly (master).

[saberraz]

Works fine in QGIS 3.8 too:

[geofffox]

My crash came when I attempted to move the domain (with the hand icon move the map). However, QGIS crashes more than any three programs I use. If it's stable for you and not for me -- well, obviously that's concerning to me.

…

On Sun, Sep 15, 2019 at 12:58 PM Sab ***@***.***> wrote: Works fine in QGIS 3.8 too: [image: image] <https://user-images.githubusercontent.com/2649047/64926921-8e8ed800-d7fb-11e9-83ed-8d87b3a9cea9.png> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#31773?email_source=notifications&email_token=AA5MGNMTIYFUDCSCZM56HXDQJ2HXTA5CNFSM4IW2B7KKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD6XX2WQ#issuecomment-531594586>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA5MGNJUQHAXJMLGL2UWQMLQJ2HXTANCNFSM4IW2B7KA> .

[saberraz]

@nirvn here is the ticket related to the mesh issue. I think it is due to size of mesh. This is from one of the datasets I opened:

• Vertex count: 1905141
• Face count: 1902284
• Dataset groups count: 19

[nirvn]

@saberraz , have you been able to replicate the crash?

[nirvn]

@geofffox , if you want to provide a valid stack trace which can help narrow down the cause of the crash, you can install qgis-dev as well as it debug symbol package (~450mb) using the osgeo4win installer.

[saberraz]

@nirvn no, it works fine for me, a bit slow (takes up ~ 2 GB of RAM) but works fine.

[nirvn]

Working fine on linux over here:

[PeterPetrik]

on Mac it does not crash, but it raises this window and it loads just first timestep

[saberraz]

I think it contains only one time step.

[PeterPetrik]

in that case i do not see anything on the canvas (white), but I see all the groups

[PeterPetrik]

• slowness of GRIB needs to be solved upstream by implemenation of native GRIB driver in MDAL (grib and netcdf (GDAL) are not very optimised lutraconsulting/MDAL#273)
• I can open the file without problem in current master, writeXML function may have been fixed since 3.8, can you reproduce the issue @geofffox with the QGIS 3.15 nightlies?

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