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EL3RST
EL3RST: Linux legacy errno
EL3RST (errno 3) reports that the legacy level-3 component reset while the operation was in flight. 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 stream/device identity, reset event/time, in-flight request, and driver state. 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
repeat one minimal request after the reset completes and compare it with the pre-reset failure. Keep the process, device/endpoint and deployed driver version fixed so the comparison changes only the suspected boundary.
Correction
repair the reset cause or reinitialize the affected protocol object before resuming work. 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 EL3RST 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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