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EBADR
EBADR: Linux legacy errno
EBADR (errno 3) reports that a request descriptor does not name a live request in the legacy driver or IPC interface. These names come from historical System V/XENIX compatibility interfaces; on modern Linux they usually point to a driver, STREAMS-compatibility layer, or legacy IPC contract rather than a general filesystem error.
Evidence to capture
Record request descriptor, owning process, driver/interface, and the operation that created it. Save errno immediately after the failing call, together with its return value, because later library or logging calls can overwrite thread-local error state.
Focused test
compare the failing descriptor with one returned by a fresh successful request on the same interface. Keep the process, device/endpoint and deployed driver version fixed so the comparison changes only the suspected boundary.
Correction
use a descriptor owned by the current request generation and fix lifetime/lookup logic. If the interface is provided by a compatibility driver, verify its documented ABI and object lifetime instead of assuming that a numerically similar errno from another UNIX has the same contract.
Verification
Repeat the original system call and confirm it passes the former EBADR boundary with the same object identity. If another errno appears, preserve it as a separate result from the next failing operation.
Technical references
- Linux man-pages: errno(3)
- Linux kernel: asm-generic errno definitions
- GNU C Library: error codes
- illumos: STREAMS programming documentation
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