When rr debug for libvirt daemon, it gets segment fault.
Version:
rr version 4.0.2
libvirt-1.2.21-1.fc24.x86_64
kernel-4.4.0-0.rc0.git6.1.fc24.x86_64
libstdc++-devel-5.2.1-5.fc24.x86_64
libstdc++-devel-5.2.1-5.fc24.i686

Stop libvirtd service and use rr to debug libvirtd service:

# systemctl stop libvirtd
# rr record /usr/sbin/libvirtd -d
rr: Saving the execution of `/usr/sbin/libvirtd' to trace directory `/root/.local/share/rr/libvirtd-9'.
[FATAL /home/hansolo/Software/rr/src/record_syscall.cc:3066:rec_process_syscall_arch() errno: 0 'Success'] 
 (task 2414 (rec:2414) at time 3733)
 ->  Assertion `t->regs().syscall_result_signed() == -syscall_state.expect_errno' failed to hold. Expected ENOSYS for 'sched_setparam' but got result 0; execution of syscall unsupported by rr
Launch gdb with
  gdb /usr/sbin/libvirtd
and attach to the rr debug server with:
  target remote :2361

In another terminnal, attach rr gdb server

# gdb -q /usr/sbin/libvirtd
(gdb) target remote :2361
Remote debugging using :2361
(gdb) c
Continuing.
Ignoring packet error, continuing...
Ignoring packet error, continuing...
Ignoring packet error, continuing...
Ignoring packet error, continuing...
Error detected on fd 9
Remote communication error.  Target disconnected.: Success.

Then rr get segment fault.
rr backtrace:

0 0x00000000006a004a in std::unique_ptr<Session::CloneCompletion, std::default_deleteSession::CloneCompletion >::get (this=0x98)

at /usr/include/c++/5.2.1/bits/unique_ptr.h:305

1 0x000000000069e37e in std::unique_ptr<Session::CloneCompletion, std::default_deleteSession::CloneCompletion >::operator bool (this=0x98)

at /usr/include/c++/5.2.1/bits/unique_ptr.h:319

2 0x000000000069bb1c in Session::finish_initializing (this=0x0) at /home/hansolo/Software/rr/src/Session.cc:318

3 0x000000000069ad21 in Session::find_task (this=0x0, rec_tid=2361) at /home/hansolo/Software/rr/src/Session.cc:135

4 0x000000000069adb9 in Session::find_task (this=0x0, tuid=...) at /home/hansolo/Software/rr/src/Session.cc:141

5 0x00000000005f0edf in GdbServer::dispatch_debugger_request (this=0x7fffffffd440, session=..., req=..., state=GdbServer::REPORT_NORMAL)

at /home/hansolo/Software/rr/src/GdbServer.cc:521

6 0x00000000005f2ca2 in GdbServer::process_debugger_requests (this=0x7fffffffd440, state=GdbServer::REPORT_NORMAL) at /home/hansolo/Software/rr/src/GdbServer.cc:867

7 0x00000000005f4f67 in GdbServer::emergency_debug (t=0x9c26c0) at /home/hansolo/Software/rr/src/GdbServer.cc:1269

8 0x000000000060e86d in emergency_debug (t=0x9c26c0) at /home/hansolo/Software/rr/src/log.cc:27

9 0x000000000060e930 in EmergencyDebugOstream::~EmergencyDebugOstream (this=0x7fffffffda90, __in_chrg=) at /home/hansolo/Software/rr/src/log.cc:34

10 0x0000000000642fce in rec_process_syscall_archrr::X64Arch (t=0x9c26c0, syscall_state=...) at /home/hansolo/Software/rr/src/record_syscall.cc:3066

11 0x0000000000639153 in rec_process_syscall_internal (t=0x9c26c0, syscall_state=...) at /home/hansolo/Software/rr/src/record_syscall.cc:3355

12 0x0000000000639189 in rec_process_syscall (t=0x9c26c0) at /home/hansolo/Software/rr/src/record_syscall.cc:3360

13 0x0000000000629721 in RecordSession::syscall_state_changed (this=0x9906d0, t=0x9c26c0, step_state=0x7fffffffe1b0)

at /home/hansolo/Software/rr/src/RecordSession.cc:737

14 0x000000000062c55e in RecordSession::record_step (this=0x9906d0) at /home/hansolo/Software/rr/src/RecordSession.cc:1454

15 0x0000000000624dc1 in record (args=std::vector of length 2, capacity 4 = {...}, flags=...) at /home/hansolo/Software/rr/src/RecordCommand.cc:185

16 0x0000000000624fd9 in RecordCommand::run (this=0x97d0f0 RecordCommand::singleton, args=std::vector of length 2, capacity 4 = {...})

at /home/hansolo/Software/rr/src/RecordCommand.cc:243

17 0x00000000006103e8 in main (argc=4, argv=0x7fffffffe468) at /home/hansolo/Software/rr/src/main.cc:259