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=== Add support for pidfd file descriptors ===
+
+'''Summary:''' Support C/R of pidfd descriptors
+
+There is pidfd_open syscall which allows opening
+a special PID file descriptor. A user can send a signal to
+the process (pidfd_send_signal syscall), wait for the process
+(poll() on pidfd).
+
+At the moment CRIU can't dump processes that have pidfd's opened.
+
+'''Links:'''
+* https://lwn.net/Articles/801319/
+* https://lwn.net/Articles/794707/
+* https://github.com/torvalds/linux/blob/v5.16/kernel/fork.c#L1877
+'''Details:'''
+* Skill level: intermediate
+* Language: C
+* Expected size: 350 hours
+* Mentors: Alexander Mikhalitsyn <alexander@mihalicyn.com>, Christian Brauner <christian@brauner.io>
+* Suggested by: Alexander Mikhalitsyn <alexander@mihalicyn.com>
+
=== Add support for memfd_secret file descriptors ===
=== Add support for memfd_secret file descriptors ===