What does errno 58 (EDEADLOCK) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a file-locking operation would create or detect a deadlock.

Could be also:
Constant	Type	OS
ERROR_BAD_NET_RESP	Win32 error	Windows
ESHUTDOWN	errno	Mac
EOWNERDEAD	errno	Solaris
SYSTEM_UNWIND_PREVIOUS_USER	BugCheck Code	Windows

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EBFONT	ESHUTDOWN

EDEADLOCK

EDEADLOCK is a Linux errno name associated with file-locking deadlock reporting. The closely related POSIX name is EDEADLK; portable code should treat both as the same logical class instead of depending on one numeric spelling.

This is not a transient I/O error. It means the requested lock cannot be granted because the lock dependency graph would deadlock, or because the kernel detected a deadlock condition while processing a blocking lock request. Retrying immediately with the same lock order can reproduce the same result.

Useful evidence

The file, byte range, lock type, and owner identity for every held lock.
Whether locks are POSIX record locks, OFD locks, or flock-style locks.
The ordering rule used by all cooperating processes.
Whether a blocking request can be replaced by a nonblocking attempt plus explicit conflict handling.

Linux fcntl(2) · POSIX errno.h · Linux errno(3) · Linux UAPI errno definitions

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