Ide segfaults on Debian

Hi,

The ide of version currently segfaults on my Debian stable system, being
of version 5.15.2+dfsg-9, and giving the gdb backtrace included below. I
also have another program, qpdfview, which segfaults in a similar way,
its backtrace mentioning libQt5Core.so.5 and libc.so.6 as well. Both
programs started doing that at roughly the same time, yet I can’t trace
this back to a certain apt package upgrade.

Now interestingly scide boots on another Debian stable box, that only
differs in having a different version of libc6 installed:

crashing installation: libc6:amd64 2.31-13+deb11u5
running installation: libc6:amd64 2.31-13+deb11u4

If I downgrade the libc6 in question to the older version, the segfault
persists and looks identical.

How can I go about debugging this further?

Thanks, Peter

#0 0x00007fff00000007 in ()
#1 0x00007ffff6e7a960 in QArrayData::shared_null () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2 0x0000555555af5178 in ()
#3 0x00007fffffffdf38 in ()
#4 0x00000000018c6d0f in ()
#5 0x00007fffffffdf04 in ()
#6 0x00005555557ea900 in ()
#7 0x00007fffffffe060 in ()
#8 0x00007ffff71f64d0 in () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#9 0x00007fffffffdfc0 in ()
#10 0xffffffff000000bc in ()
#11 0x0000000400000001 in ()
#12 0x0000002b00000004 in ()
#13 0x0100000000000009 in ()
#14 0x00007ffff7031000 in ()
#15 0x00000000631b43fc in ()
#16 0x00007ffff7fa32d8 in ()
#17 0x00007ffff7285551 in () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#18 0x0000555555af5c60 in ()
#19 0x00005555557f7e10 in ()
#20 0x00007f00000001c0 in ()
#21 0x00007ffff7fdcce1 in () at /lib64/ld-linux-x86-64.so.2
#22 0x00007fffffffe1f0 in ()
#23 0x00007fffffffe2b0 in ()
#24 0x00007ffff6c2a644 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007ffff6c28fa5 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007ffff6c29351 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007ffff6c2992e in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007ffff6c2b2f2 in () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x0000555555651f63 in ()
#30 0x000055555561324e in ()
#31 0x00005555555b7a54 in ()
#32 0x00005555555b63a5 in ()
#33 0x00005555555b4f8e in ()
#34 0x00007ffff65c3d0a in __libc_start_main () at /lib/x86_64-linux-gnu/libc.so.6
#35 0x00005555555b5a8a in ()