bug#63675: shepherd 0.10.0 test 2 fail on riscv64-linux

[Z572]

on qemu:
 forking-service.sh test always fail.


try use strace but can't:

```
+ /gnu/store/w7a3fxw00y4picvcrkvdxavpj5gqabbb-strace-6.2/bin/strace -f -t -s 80 
-o /tmp/she.strace shepherd -I -s t-socket-25862 -c t-conf-25862 -l t-log-25862 
--pid=t-pid-25862
+ sleep 0.3
/gnu/store/w7a3fxw00y4picvcrkvdxavpj5gqabbb-strace-6.2/bin/strace: 
test_ptrace_get_syscall_info: PTRACE_TRACEME: Function not implemented
/gnu/store/w7a3fxw00y4picvcrkvdxavpj5gqabbb-strace-6.2/bin/strace: 
ptrace(PTRACE_TRACEME, ...): Function not implemented
/gnu/store/w7a3fxw00y4picvcrkvdxavpj5gqabbb-strace-6.2/bin/strace: 
PTRACE_SETOPTIONS: Function not implemented
/gnu/store/w7a3fxw00y4picvcrkvdxavpj5gqabbb-strace-6.2/bin/strace: detach: 
waitpid(25922): No child processes
```

pid-file.sh fail in check phase, but success at rerun use 'make check 
TESTS=tests/pid-file.sh'


riscv machine temporarily unable to reproduce.

pid-file.log
Description: Text document

forking-service.log
Description: Text document

Ludovic Courtès <ludo@gnu.org> writes:

> Ludovic Courtès <ludo@gnu.org> skribis:
>
>> Here it looks as though process 6499 (associated with service
>> ‘test’) is
>> either not receiving SIGHUP as sent by “kill 6499” or is ignoring it.
>
> It’s a similar issue in ‘tests/pid-file.sh’, it seems.
>
> To get a better understanding of what’s happening, could you replace:
>
>   shepherd -I …
>
> by:
>
>   strace -f -t -s 80 -o /tmp/shepherd.strace shepherd -I …
>
> at the beginning of ‘tests/forking-service.sh’?  Then, once you’ve
> managed to get the test to fail again, please send both
> ‘tests/forking-service.log’ and ‘/tmp/shepherd.strace’.
>
> TIA!
>
> Ludo’.


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over