[michaelx386]

Thank you, it's not always clear when a reboot is needed after an update. I do it with kernel updates but wouldn't have in this case until I read your comment and ran the command to check.

If would be nice if package managers would let us know when this is necessary, I expect that might be a hard thing to get right though.

[JshWright]

You can check to see if any running process are using any stale libraries pretty easily:

sudo lsof | grep lib | grep DEL

You can then either reload those processes manually, or just bounce the box if that's easier.

[gtrubetskoy]

There's also a rare chance that a program is statically linked, in which case upgrading glibc won't help, the program would need to be recompiled.

[0x0]

For debian, you can use "checkrestart -v" from the "debian-goodies" package.