mtda-cli storage write intermittently fails with INTERNAL error (unbound 'result' variable)

[Gourav7389]

Running the following command:
mtda-cli -r mtda-host-ip storage write image.wic.zst
Discovered bmap file 'image.wic.bmap'
image.wic.zst: [####################] 100% (893 MiB read, 5.72 GiB written, 22 KiB/s)
'storage write' failed! (<_InactiveRpcError of RPC that terminated with:
status = StatusCode.INTERNAL
details = "cannot access local variable 'result' where it is not associated with a value"
debug_error_string = "UNKNOWN:Error received from peer ipv4:mtda-host-ip:5556 {grpc_message:"cannot access local variable 'result' where it is not associated with a value", grpc_status:13, created_time:"2026-04-09T18:36:43.631966751+05:30"}"

)

Results in intermittent behavior:

• Sometimes completes successfully
• Sometimes fails with the following error:

Notes:

• Data transfer reaches 100% even when failure occurs
• Issue is not consistent (flaky behavior)
• Error suggests an uninitialized variable (result) on the server side

[Gourav7389]

Currently investigating this issue.

[chombourger]

Presumably observed with 0.46 as the issue description mentions gRPC

[chombourger]

any server side logs? journalctl -u mtda

[chombourger]

Was not successful with a pure code analysis. probably a subtle bug and we would need server-side logs

[Gourav7389]

any server side logs? journalctl -u mtda

I checked the server-side logs (journalctl) during my investigation, but I did not observe any corresponding errors at the time of the failure.

I also attempted multiple times to reproduce the issue; however, I am currently unable to reproduce it. The behavior appears to have been intermittent earlier, but it is not occurring anymore in my recent tests.

Once the issue is observed again, I will capture and share the relevant server-side logs for further analysis.