To reproduce, grab deluge from the repository and just run it -- it gives a segfault right on startup.
Got the backtrace by running gdb --args python3 /usr/bin/deluge and then run followed by backtrace in the gdb console:
#0 0x00007ffff7febbf0 in __tls_get_addr () at /usr/lib64/ld-linux-x86-64.so.2 #1 0x00007fffe84f820b in _pixman_implementation_lookup_composite () at /usr/lib/libpixman-1.so.0 #2 0x00007fffe84f33fe in pixman_image_composite32 () at /usr/lib/libpixman-1.so.0 #3 0x00007fffe88c41f5 in () at /usr/lib/libcairo.so.2 #4 0x00007fffe88827f1 in () at /usr/lib/libcairo.so.2 #5 0x00007fffe8883270 in () at /usr/lib/libcairo.so.2 #6 0x00007fffe88ded85 in () at /usr/lib/libcairo.so.2 #7 0x00007fffe886d777 in () at /usr/lib/libcairo.so.2 #8 0x00007fffe88cbbf6 in () at /usr/lib/libcairo.so.2 #9 0x00007fffe88d18db in () at /usr/lib/libcairo.so.2 #10 0x00007fffe885f315 in cairo_paint_with_alpha () at /usr/lib/libcairo.so.2 #11 0x00007fffe4b7cfe4 in () at /usr/lib/librsvg-2.so.2 #12 0x00007fffe4c11806 in () at /usr/lib/librsvg-2.so.2 #13 0x00007fffe4bb1e28 in () at /usr/lib/librsvg-2.so.2 #14 0x00007fffe4b861ff in () at /usr/lib/librsvg-2.so.2 #15 0x00007fffe4bb2424 in () at /usr/lib/librsvg-2.so.2 #16 0x00007fffe4c13fcc in () at /usr/lib/librsvg-2.so.2 #17 0x00007fffe4b79929 in () at /usr/lib/librsvg-2.so.2 #18 0x00007fffe4c13c14 in () at /usr/lib/librsvg-2.so.2 #19 0x00007fffe4bb1e28 in () at /usr/lib/librsvg-2.so.2 #20 0x00007fffe4b861ff in () at /usr/lib/librsvg-2.so.2 #21 0x00007fffe4bb1419 in () at /usr/lib/librsvg-2.so.2 #22 0x00007fffe4bb111c in () at /usr/lib/librsvg-2.so.2 #23 0x00007fffe4b566b0 in rsvg_rust_handle_get_pixbuf_sub () at /usr/lib/librsvg-2.so.2 #24 0x00007fffe65d4282 in () at /usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so #25 0x00007fffe7b2d193 in gdk_pixbuf_loader_close () at /usr/lib/libgdk_pixbuf-2.0.so.0 #26 0x00007fffe7b2886b in () at /usr/lib/libgdk_pixbuf-2.0.so.0 #27 0x00007fffe7b2a27b in gdk_pixbuf_new_from_stream_at_scale () at /usr/lib/libgdk_pixbuf-2.0.so.0 #28 0x00007fffe71d2c56 in () at /usr/lib/libgtk-3.so.0 ...
Looks like a library issue by way of GTK3 -> gtk-pixbuf -> librsvg -> cairo -> libpixman.
This change from back in October looks suspicious: https://dev.getsol.us/D7430
Will the maintainer please help to take a look?
Dependencies from Github: https://github.com/deluge-torrent/deluge/blob/develop/DEPENDS.md