What does errno 58 (EOWNERDEAD) mean?

EOWNERDEAD

Robust mutex recovery

On Solaris, EOWNERDEAD is errno value 58. The base message is process died with the lock, but the useful diagnostic context is narrower than the short message: solaris acquired a robust mutex whose previous owner died before unlocking it.

For EOWNERDEAD, use the Solaris-specific errno table first, then compare with POSIX only for portable behavior. For EOWNERDEAD, some Solaris values share names with other UNIX systems but have different numbers or more specific historical meanings.

What to check for EOWNERDEAD

• The protected state may be inconsistent and must be repaired before the mutex is marked consistent.
• If recovery cannot be completed, later lockers can see ENOTRECOVERABLE.
• Log the protected object, not only the mutex address.

References for EOWNERDEAD

• Oracle Solaris intro(2): error numbers
• illumos errno.h definitions
• POSIX errno.h

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