CI instability on `test_gdb_end_to_end `

[ludfjig]

GDB test related failed

https://github.com/hyperlight-dev/hyperlight/actions/runs/15645064712/job/44080943114?pr=624

[dblnz]

Output saved here:

cargo test --profile=dev --example guest-debugging --features gdb
   Compiling managed v0.8.0
   Compiling hyperlight-host v0.6.1 (/mnt/vss/_work/hyperlight/hyperlight/src/hyperlight_host)
   Compiling gdbstub v0.7.6
   Compiling gdbstub_arch v0.3.2
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.94s
     Running unittests examples/guest-debugging/main.rs (target/debug/examples/guest_debugging-37b3b6b63a06b41c)

running 1 test
   Compiling hyperlight-host v0.6.1 (/mnt/vss/_work/hyperlight/hyperlight/src/hyperlight_host)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.89s
     Running `/mnt/vss/_work/hyperlight/hyperlight/target/debug/examples/guest-debugging`
test tests::test_gdb_end_to_end ... FAILED

failures:

---- tests::test_gdb_end_to_end stdout ----

thread 'tests::test_gdb_end_to_end' panicked at src/hyperlight_host/examples/guest-debugging/main.rs:237:9:
Failed to remove gdb.output file: No such file or directory (os error 2)
stack backtrace:
   0:     0x5ba76d983e8a - std::backtrace_rs::backtrace::libunwind::trace::h2740d05102fd9881
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x5ba76d983e8a - std::backtrace_rs::backtrace::trace_unsynchronized::h93ae2edf130065c8
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x5ba76d983e8a - std::sys::backtrace::_print_fmt::h7660a544e6110dd9
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/backtrace.rs:66:9
   3:     0x5ba76d983e8a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hfc616348d9ad0abc
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/backtrace.rs:39:26
   4:     0x5ba76d9aad23 - core::fmt::rt::Argument::fmt::h3a92517f8117fcd5
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/fmt/rt.rs:177:76
   5:     0x5ba76d9aad23 - core::fmt::write::h7ca648217bc79799
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/fmt/mod.rs:1440:21
   6:     0x5ba76d980cb3 - std::io::Write::write_fmt::h7a0db39607c8d7f1
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/io/mod.rs:1887:15
   7:     0x5ba76d983cd2 - std::sys::backtrace::BacktraceLock::print::h3fb349e80cbe0423
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/backtrace.rs:42:9
   8:     0x5ba76d9853c0 - std::panicking::default_hook::{{closure}}::h3366e5842cba645d
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:295:22
   9:     0x5ba76d98515d - std::panicking::default_hook::hd7573a5d4879884b
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:319:9
  10:     0x5ba76d93cd33 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h02d77aa4f52cd20c
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/alloc/src/boxed.rs:2007:9
  11:     0x5ba76d93cd33 - test::test_main::{{closure}}::h3329b5257cebe6bf
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:134:21
  12:     0x5ba76d985bf3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h45505a20cf18da73
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/alloc/src/boxed.rs:2007:9
  13:     0x5ba76d985bf3 - std::panicking::rust_panic_with_hook::h66e909d048c263a9
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:836:13
  14:     0x5ba76d9858ca - std::panicking::begin_panic_handler::{{closure}}::h8d9aa8be7e8634cf
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:701:13
  15:     0x5ba76d984399 - std::sys::backtrace::__rust_end_short_backtrace::h7d7e47ef99abf6aa
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/backtrace.rs:168:18
  16:     0x5ba76d98555d - rust_begin_unwind
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:692:5
  17:     0x5ba76d8fad20 - core::panicking::panic_fmt::hf8ffc7c15bfb58a0
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/panicking.rs:75:14
  18:     0x5ba76d8fe1fe - core::panicking::panic_display::he1a5adbea8143b46
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/panicking.rs:261:5
  19:     0x5ba76d90398a - guest_debugging::tests::test_gdb_end_to_end::panic_cold_display::h1d564194ace55fdd
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/panic.rs:100:13
  20:     0x5ba76d9037d9 - guest_debugging::tests::test_gdb_end_to_end::h79bb07841baa3577
                               at /mnt/vss/_work/hyperlight/hyperlight/src/hyperlight_host/examples/guest-debugging/main.rs:237:9
  21:     0x5ba76d9033c7 - guest_debugging::tests::test_gdb_end_to_end::{{closure}}::h5c61288dec6d35b1
                               at /mnt/vss/_work/hyperlight/hyperlight/src/hyperlight_host/examples/guest-debugging/main.rs:228:29
  22:     0x5ba76d8fce26 - core::ops::function::FnOnce::call_once::hb99f4335ffc8b184
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/ops/function.rs:250:5
  23:     0x5ba76d9424fb - core::ops::function::FnOnce::call_once::he1ae9338166eb2a5
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/ops/function.rs:250:5
  24:     0x5ba76d9424fb - test::__rust_begin_short_backtrace::h6b9d05c790574b6e
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:632:18
  25:     0x5ba76d941413 - test::run_test_in_process::{{closure}}::ha861f13dc759cdf1
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:655:60
  26:     0x5ba76d941413 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h731642319852604d
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/panic/unwind_safe.rs:272:9
  27:     0x5ba76d941413 - std::panicking::try::do_call::h0addb3ea375e3289
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:584:40
  28:     0x5ba76d941413 - std::panicking::try::hdf74352802aec702
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:547:19
  29:     0x5ba76d941413 - std::panic::catch_unwind::h15a83385fd44db4e
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panic.rs:358:14
  30:     0x5ba76d941413 - test::run_test_in_process::h04c90725f42eff0e
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:655:27
  31:     0x5ba76d941413 - test::run_test::{{closure}}::h4736f66e3e18a838
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:576:43
  32:     0x5ba76d905115 - test::run_test::{{closure}}::hde5a40de695efca0
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/test/src/lib.rs:606:41
  33:     0x5ba76d905115 - std::sys::backtrace::__rust_begin_short_backtrace::h160130b314e78d76
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/backtrace.rs:152:18
  34:     0x5ba76d908ad6 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h015ee52be309757b
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/thread/mod.rs:564:17
  35:     0x5ba76d908ad6 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h679a063b8efbcec1
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/panic/unwind_safe.rs:272:9
  36:     0x5ba76d908ad6 - std::panicking::try::do_call::h7a09fe48d63686b4
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:584:40
  37:     0x5ba76d908ad6 - std::panicking::try::hb6264256da9aa6fa
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panicking.rs:547:19
  38:     0x5ba76d908ad6 - std::panic::catch_unwind::h9e7d6377787df0b2
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/panic.rs:358:14
  39:     0x5ba76d908ad6 - std::thread::Builder::spawn_unchecked_::{{closure}}::hb5cd35d3a55a588f
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/thread/mod.rs:562:30
  40:     0x5ba76d908ad6 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h04f1b04bd62e4fae
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/core/src/ops/function.rs:250:5
  41:     0x5ba76d989dfb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h56a8539f31f3aa84
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/alloc/src/boxed.rs:1993:9
  42:     0x5ba76d989dfb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8f385295f3a550fd
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/alloc/src/boxed.rs:1993:9
  43:     0x5ba76d989dfb - std::sys::pal::unix::thread::Thread::new::thread_start::hc1bbaaa2227026bb
                               at /rustc/4eb161250e340c8f48f66e2b929ef4a5bed7c181/library/std/src/sys/pal/unix/thread.rs:106:17
  44:     0x7a73c2a94ac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  45:     0x7a73c2b26850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  46:                0x0 - <unknown>


failures:
    tests::test_gdb_end_to_end

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 13.08s

error: test failed, to rerun pass `-p hyperlight-host --example guest-debugging`
error: Recipe `test-rust-gdb-debugging` failed on line 131 with exit code 101
Error: Process completed with exit code 101.

[jsturtevant]

closing as I we haven't seen this reported in a while. Can re-open as needed