`humility monorail status` panic

[adamlouis]

humility monorail status panics when pointed at sidecar reverso with the following error:

$ ./humility --ip ... --archive ... monorail status
humility: connecting to XXX%YYY

thread 'main' (1) panicked at humility-hiffy/src/lib.rs:701:38:
range end index 12 out of range for slice of length 11
...
$

humility-hiffy/src/lib.rs:701:38 -

humility/humility-hiffy/src/lib.rs

Line 701 in ebaeedd

.copy_from_slice(&buf[5..(5 + nreply as usize)]);

• built humility from source at ebaeedd2b772fe5b97641ed373063a5ca72bd666
• running reverso sidecar SP at mkeeter/disable-uplink-connection - 9b0a4a5460fe385b976ad96a6969f60473fc9066 - https://github.com/oxidecomputer/hubris/commits/mkeeter/disable-uplink-connection/

[mkeeter]

Here's a full backtrace:

matt@silver ~ $ env RUST_BACKTRACE=1 pfexec humility --archive=/data/local/debug/build-sidecar-d-reverso-image-default.disable-uplink-connection.zip --ip=fe80::aa40:25ff:fe05:2800%dut0 monorail status
humility: connecting to fe80::aa40:25ff:fe05:2800%16

thread 'main' (1) panicked at humility-hiffy/src/lib.rs:619:38:
range end index 12 out of range for slice of length 11
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/std/src/panicking.rs:698:5
   1: core::panicking::panic_fmt
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panicking.rs:75:14
   2: core::slice::index::slice_index_fail::do_panic::runtime
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panic.rs:173:21
   3: core::slice::index::slice_index_fail
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/panic.rs:178:9
   4: humility_hiffy::HiffyContext::perform_rpc::hiffy_send_fn
   5: hif::execute
             at /home/andy/.cargo/git/checkouts/hif-bfb340cd5efa43ff/34aace6/src/lib.rs:553:36
   6: humility_hiffy::HiffyContext::perform_rpc
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-hiffy/src/lib.rs:691:17
   7: humility_hiffy::HiffyContext::start
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-hiffy/src/lib.rs:950:25
   8: humility_hiffy::HiffyContext::run
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-hiffy/src/lib.rs:1116:14
   9: humility_cmd_monorail::monorail_status
             at /home/andy/git/garbage-compactor/humility/work/src64/cmd/monorail/src/lib.rs:732:35
  10: humility_cmd_monorail::monorail
             at /home/andy/git/garbage-compactor/humility/work/src64/cmd/monorail/src/lib.rs:1077:13
  11: humility::cmd::subcommand::{{closure}}
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-bin/src/cmd.rs:98:17
  12: humility_cmd::attach
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-cmd/src/lib.rs:189:5
  13: humility::cmd::subcommand
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-bin/src/cmd.rs:97:13
  14: humility::main
             at /home/andy/git/garbage-compactor/humility/work/src64/humility-bin/src/main.rs:46:23
  15: core::ops::function::FnOnce::call_once
             at /home/andy/.rustup/toolchains/stable-x86_64-unknown-illumos/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.