Just updated my HP6830s laptop to kernel 3.9.1, and got a hang at boot:

…………….
Mounting /boot…
systemd[1]: segfault at 0 ip 00007fede1d04241 sp  00007fff8e4fdf20 error 4 in libc-2.16.so[7fede1c90000+1ad000]
[FAILED] Failed to activate swap /dev/disk/by-uuid/82145a5b-0a2f-4659-9f14-8acf69aea7b4.
……………..
[   OK   ] Reached target Swap.
<<<  HANG  >>>

Reverted to 3.9.0, and everything was OK…     No mention of this – so far – on the LKML (Linux Kernel Mailing List), so it might be something specific to the hardware (and this model of laptop has a rather ‘fragile’ bios…)..

Needs more investigation – or I’ll just wait for 3.9.2..

Robert Gadsdon.   May 9, 2013.