Mmap tests fail with GuestAborted(15, "Exception: PageFault" )

[jsturtevant]

What happened?

I am seeing some issues with mmap locally and just saw it in CI too:

https://github.com/hyperlight-dev/hyperlight/actions/runs/22244376418/job/64356078579?pr=1231

thread 'sandbox::initialized_multi_use::tests::test_mmap_write_exec' panicked at src/hyperlight_host/src/sandbox/initialized_multi_use.rs:1226:14:

called `Result::unwrap()` on an `Err` value: GuestAborted(15, "Exception: PageFault | Exception vector: 14\nFaulting 
Instruction: 0x100000000\nBytes At Faulting Instruction: [144, 144, 144, 195, 0, 0, 0, 0]\nPage Fault Address: 
0x100000000\nError code: 0x10\nStack Pointer: 0xffffffffffffed10")

Locally I saw on the mmap test:

cargo test --package hyperlight-host --lib -- sandbox::initialized_multi_use::tests::test_mmap --exact --nocapture 

   Compiling hyperlight-host v0.12.0 (/home/jstur/projects/hyperlight-project/hyperlight-810/src/hyperlight_host)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 8.15s
     Running unittests src/lib.rs (target/debug/deps/hyperlight_host-13e5c115e4913fb6)

running 1 test

thread 'sandbox::initialized_multi_use::tests::test_mmap' panicked at src/hyperlight_host/src/sandbox/initialized_multi_use.rs:1188:14:

called `Result::unwrap()` on an `Err` value: GuestAborted(15, "Exception: PageFault | Exception vector: 14\nFaulting
 Instruction: 0x6dfc0\nBytes At Faulting Instruction: [139, 8, 72, 139, 69, 216, 137, 8]\nPage Fault Address: 
0x100000000\nError code: 0x0\nStack Pointer: 0xffffffffffffed10")
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/panicking.rs:75:14
   2: core::result::unwrap_failed
             at /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/result.rs:1761:5
   3: core::result::Result<T,E>::unwrap
             at /home/jstur/.rustup/toolchains/1.89-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/result.rs:1167:23
   4: hyperlight_host::sandbox::initialized_multi_use::tests::test_mmap
             at ./src/sandbox/initialized_multi_use.rs:1188:14
   5: hyperlight_host::sandbox::initialized_multi_use::tests::test_mmap::{{closure}}
             at ./src/sandbox/initialized_multi_use.rs:1160:19
   6: core::ops::function::FnOnce::call_once
             at /home/jstur/.rustup/toolchains/1.89-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
   7: core::ops::function::FnOnce::call_once
             at /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
test sandbox::initialized_multi_use::tests::test_mmap ... FAILED

What did you expect to happen?

tests to pass

Steps to reproduce the behavior

checkout main and run cargo test --package hyperlight-host --lib -- sandbox::initialized_multi_use::tests::test_mmap --exact --nocapture

I don't know why it passes in CI most of the time

Hyperlight Version

main branch

OS version

Details

On Linux local:
$ cat /etc/os-release
cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.3 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

in ci: build-test (mshv3, intel, release) 


$ uname -a
Linux james-2025 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun  5 18:30:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

On Windows:
C:\> cmd /c ver
# paste output here

Additional Information

No response