Cannot insert breakpoint / Cannot access memory using eclipse

Reproduce the recorded block program under Eclipse using the documented rrgdb setup and compare it with direct rr replay. Start at src/GdbServer.cc:1159 and inspect the breakpoint insertion and resume-request handling. Done means Eclipse can insert the breakpoint at main, continue execution, and avoid the reported assertion.

I am having a lot of trouble trying to use Mozilla rr together with eclipse.
I'm using eclipse 2019-12 (4.14.0) on Ubuntu 18.04 (fully updated).
I downloaded Mozilla rr using git pull. I built commit ac321e492e3c517ee5a26d990271728c55a732c67
last change by Kyle Huey on 2020-02-27.

I followed the build instructions from
https://github.com/mozilla/rr/wiki/Building-And-Installing

git clone https://github.com/mozilla/rr.git
mkdir obj && cd obj
cmake ../rr
make -j8
sudo make install

Then I manually built the 'block' test program:

gcc -g3 -I../rr/include -I../rr/src/test -I. ../rr/src/test/block.d -lpthread -o block

And then recorded its execution

rr record ./block

I can successfully replay this recording with rr directly, including inserting breakpoints. It all seems to work as intended there.

However, I have trouble trying to run this program under eclipse. I have set up an rrgdb script as per https://github.com/mozilla/rr/wiki/Using-rr-in-an-IDE . Note that eclipse has a breakpoint at main displayed in the Break tab. When I launch the debugging session under Eclipse, the Debugger Console says

0x00007fae688a3090 in _start () from /lib64/ld-linux-x86-64.so.2
(rr) cont
Continuing.
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x2e7c

If I then disable the breakpoint from the eclipse Break tab, then the following is displayed:

(rr) rr: /export/home/stanb/rr/rr/src/GdbServer.cc:1159: rr::GdbServer::ContinueOrStop rr:GdbServer:debug_one_step(rr:GdbRequest&): Assertion `req.is_resume_request()' failed.
(rr)

If I terminate the debugging session in eclipse and start a new one, and ensure that the breakpoint is disabled, then I can successfuly run the program. However, I cannot insert a breakpoint running under eclipse, which is a serious problem for a debugger.