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chore(kernel): add opt-in AGENTOS_DEBUG_EBADF mapped-fd backtrace #1808

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chore(kernel): add opt-in AGENTOS_DEBUG_EBADF mapped-fd backtrace #1808

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8 changes: 8 additions & 0 deletions crates/kernel/src/fd_table.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,14 @@ impl FdTableError {
}

fn bad_file_descriptor(fd: u32) -> Self {
// TEMPORARY DIAGNOSTIC (load-testing LT-024): capture where a mapped
// host fd (>= MAPPED_HOST_FD_START) reaches the kernel fd table.
if std::env::var("AGENTOS_DEBUG_EBADF").as_deref() == Ok("1") && fd >= 1_000_000_000 {
eprintln!(
"AGENTOS_DEBUG_EBADF fd={fd}\n{}",
std::backtrace::Backtrace::force_capture()
);
}
Self {
code: "EBADF",
message: format!("bad file descriptor {fd}"),
Expand Down