RKWardCoreTest::initTestCase() failed on riscv64

[Bo YU]

Hi,

(Please ccing me.:)

I am looking at one ftbfs issue on riscv64:

https://buildd.debian.org/status/fetch.php?pkg=rkward&arch=riscv64&ver=0.7.5-3&stamp=1716877944&raw=0

the error log:

```
41960: Transmitting request type 15 of length 12
44594: Backend startup failed
44594: Listing contents of /tmp/rkward.rbackend

=== Received signal at function time: 44596ms, total time: 44597ms,
dumping stack ===
=== End of stack trace ===
44594: QFATAL : RKWardCoreTest::initTestCase() Received signal 11
         Function time: 44596ms Total time: 44596ms
FAIL!  : RKWardCoreTest::initTestCase() Received a fatal error.
   Loc: [Unknown file(0)]
Totals: 0 passed, 1 failed, 0 skipped, 0 blacklisted, 44602ms
********* Finished testing of RKWardCoreTest *********
<end of output>
Test time =  45.54 sec
----------------------------------------------------------
Test Failed.
"rkward-core_test" end time: May 29 10:28 UTC
"rkward-core_test" time elapsed: 00:00:45
```

But I failed  how to debug the issue, could you give one idea how to debug this?

Thanks.

BR,
Bo