Alpine Linux bug report: https://gitlab.alpinelinux.org/alpine/aports/-/issues/14980#note_317133
Just to include a bit more detail in this bug report rather than having to go outside this bugtracker: This seems to be due to a small stack size. When the stack size of Dolphin is increased to 1M (using LDFLAGS="$LDFLAGS -Wl,-z,stack-size=0x100000") it never happens.