Hello Andy Dorman, the new location seems to be in the following directory:
root@debian:~# dpkg -L libtcmalloc-minimal4 | sort ... /usr/lib/x86_64-linux-gnu/libtcmalloc_minimal_debug.so.4 /usr/lib/x86_64-linux-gnu/libtcmalloc_minimal_debug.so.4.5.3 /usr/lib/x86_64-linux-gnu/libtcmalloc_minimal.so.4 /usr/lib/x86_64-linux-gnu/libtcmalloc_minimal.so.4.5.3 So I guess you should change your configuration that LD_PRELOAD points to the new file, if this is still an issue. This report might then just be closed, I guess. Kind regards, Bernhard