Ubuntu
udev package

  1. Bug #407428
  2. Comment #35

Comment 35 for bug 407428

Revision history for this message
Takeshi Sone (ts1) wrote : Re: sshd zombie processes and strange behavior after karmic upgrade

I am also experiencing this problem, and found that some other processes have this strange signal mask.
udevd and dhclient3.
They are not descendants of sshd.
So I guess the culprit is not sshd but somewhere in the system startup scripts.