[QGIS-Developer] QGIS unstable on debian testing

[uclaros]

Hi,
after some recent package updates in Debian bullseye (testing), QGIS builds
have become unstable for me. While rendering on pan/zoom/vertex editing on a
project with a couple of geopackage layers, QGIS may freeze completely (idle
cpu) or crash with a dump like :
2020-04-09T00:00:27.315  [New LWP 122940]
2020-04-09T00:00:27.315  [New LWP 122941]
2020-04-09T00:00:27.315  [New LWP 122943]
2020-04-09T00:00:27.315  [New LWP 122944]
2020-04-09T00:00:27.315  [New LWP 122945]
2020-04-09T00:00:27.315  [New LWP 122946]
2020-04-09T00:00:27.315  [New LWP 122947]
2020-04-09T00:00:27.315  [New LWP 122948]
2020-04-09T00:00:27.315  [New LWP 122949]
2020-04-09T00:00:27.315  [New LWP 122950]
2020-04-09T00:00:27.315  [New LWP 122953]
2020-04-09T00:00:27.315  [New LWP 122957]
2020-04-09T00:00:27.315  [New LWP 122958]
2020-04-09T00:00:27.315  [New LWP 122959]
2020-04-09T00:00:51.886  [Thread debugging using libthread_db enabled]
2020-04-09T00:00:51.886  Using host libthread_db library
"/lib/x86_64-linux-gnu/libthread_db.so.1".
2020-04-09T00:01:00.643  0x00007f62e03c4b4f in __GI___poll
(fds=0x55bb3c41c110, nfds=7, timeout=16) at
../sysdeps/unix/sysv/linux/poll.c:29
2020-04-09T00:01:00.644  29     ../sysdeps/unix/sysv/linux/poll.c: No such
file or directory.
2020-04-09T00:01:04.882  [Current thread is 1 (Thread 0x7f62d1bc6f80 (LWP
122933))]
2020-04-09T00:01:04.882  #0  0x00007f62e03c4b4f in __GI___poll
(fds=0x55bb3c41c110, nfds=7, timeout=16) at
../sysdeps/unix/sysv/linux/poll.c:29
2020-04-09T00:01:04.882          resultvar = 18446744073709551100
2020-04-09T00:01:04.882          sc_cancel_oldtype = 0
2020-04-09T00:01:04.882  #1  0x00007f62d90f97fe in  () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
2020-04-09T00:01:04.882  #2  0x00007f62d90f991f in g_main_context_iteration
() at /lib/x86_64-linux-gnu/libglib-2.0.so.0
2020-04-09T00:01:04.882  #3  0x00007f62e094e7c1 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() at /lib/x86_64-linux-gnu/libQt5Core.so.5
2020-04-09T00:01:04.882  #4  0x00007f62e08f76db in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
2020-04-09T00:01:04.882  #5  0x00007f62e08ff182 in QCoreApplication::exec()
() at /lib/x86_64-linux-gnu/libQt5Core.so.5
2020-04-09T00:01:04.883  #6  0x000055bb3a6dd43c in main(int, char**)
(argc=<optimized out>, argv=<optimized out>) at ../src/app/main.cpp:1608
...

This happens to new builds, both master and older versions and the 3.10.3
that gets installed from the debian repository.
The recent update included proj 7.0.0 which is a major difference since the
issues appeared.
I was hoping to avoid building everything from source, but if I am to build
an older proj version, what other packages should I look into rebuilding?
Any other debian testing users having such issues?




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