As fas as I can see it is compiled with -march=x86-64. Can you post a full backtrace?

Here it is:

[rv@maisondubonheur digikam]$ coredumpctl gdb
PID: 55228 (digikam)
UID: 1000 (rv)
GID: 100 (users)
Signal: 4 (ILL)
Timestamp: Fri 2023-04-14 10:53:25 CEST (50min ago)
Command Line: digikam
Executable: /usr/bin/digikam
Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-org.gnome.Terminal.slice/vte-spawn-71d91aa2-c2db-4230-b06c-0ae5899b88ae.scope
Unit: user@1000.service
User Unit: vte-spawn-71d91aa2-c2db-4230-b06c-0ae5899b88ae.scope
Slice: user-1000.slice
Owner UID: 1000 (rv)
Boot ID: 3bca9440362c4f57b857693e4c38cf3d
Machine ID: 011fc5ea012240c58a20e308fc5de2ac
Hostname: maisondubonheur
Storage: /var/lib/systemd/coredump/core.digikam.1000.3bca9440362c4f57b857693e4c38cf3d.55228.1681462405000000.zst (present)
Size on Disk: 3.6M
Message: Process 55228 (digikam) of user 1000 dumped core.

Stack trace of thread 55228:
#0 0x00007f1c77f6d08d _ZN4QtAV7Widgets17registerRenderersEv (libdigikamcore.so.8.0.0 + 0x96d08d)
#1 0x00007f1c77960ece n/a (libdigikamcore.so.8.0.0 + 0x360ece)
#2 0x00007f1c791820fe n/a (ld-linux-x86-64.so.2 + 0x50fe)
#3 0x00007f1c791821ec n/a (ld-linux-x86-64.so.2 + 0x51ec)
#4 0x00007f1c79197f00 n/a (ld-linux-x86-64.so.2 + 0x1af00)
ELF object binary architecture: AMD x86-64

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Reading symbols from /usr/bin/digikam...
Reading symbols from /home/rv/.cache/debuginfod_client/2718180ea985c1ee14064c5a1c0c605ea0ab32ad/debuginfo...
[New LWP 55228]
BFD: warning: /home/rv/.cache/debuginfod_client/a504d8d908a70a0e29bb8edba66347168fd630b8/debuginfo has a section extending past end of file
Error while reading shared library symbols for /usr/lib/libQt5WebEngineWidgets.so.5:
`/home/rv/.cache/debuginfod_client/a504d8d908a70a0e29bb8edba66347168fd630b8/debuginfo': can't read symbols: file format not recognized.
--Type <RET> for more, q to quit, c to continue without paging--c
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `digikam'.
Program terminated with signal SIGILL, Illegal instruction.
#0 0x00007f1c77f6d08d in QtAV::Widgets::registerRenderers () at /usr/src/debug/digikam/digikam-8.0.0/core/libs/video/qtav/widgets/QtAVWidgets_Global.cpp:92
92 {
(gdb) bt full
#0 0x00007f1c77f6d08d in QtAV::Widgets::registerRenderers() () at /usr/src/debug/digikam/digikam-8.0.0/core/libs/video/qtav/widgets/QtAVWidgets_Global.cpp:92
initialized = false
#1 0x00007f1c77960ece in _sub_I_65535_0.0 () at /usr/lib/libdigikamcore.so.8.0.0
#2 0x00007f1c791820fe in call_init (env=0x7ffc8d4884e8, argv=0x7ffc8d4884d8, argc=1, l=<optimized out>) at dl-init.c:70
j = 0
jm = <optimized out>
addrs = <optimized out>
init_array = <optimized out>
__PRETTY_FUNCTION__ = "call_init"
__PRETTY_FUNCTION__ = "call_init"
#3 call_init (l=<optimized out>, argc=1, argv=0x7ffc8d4884d8, env=0x7ffc8d4884e8) at dl-init.c:26
__PRETTY_FUNCTION__ = "call_init"
#4 0x00007f1c791821ec in _dl_init (main_map=0x7f1c791b12c0, argc=1, argv=0x7ffc8d4884d8, env=0x7ffc8d4884e8) at dl-init.c:117
preinit_array = <optimized out>
preinit_array_size = <optimized out>
i = <optimized out>
#5 0x00007f1c79197f00 in _dl_start_user () at /lib64/ld-linux-x86-64.so.2
#6 0x0000000000000001 in ()
#7 0x00007ffc8d488a3b in ()
#8 0x0000000000000000 in ()
(gdb)

Thanks. Looks like the bundled QtAV has some CPU specific code.