[ARROW-1327] [Python] Failing to release GIL in MemoryMappedFile._open causes deadlock

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.5.0
• Fix Version/s: 0.6.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/17361
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 03/Aug/17 13:33
• Updated: 11/Jan/23 07:14
• Resolved: 07/Aug/17 14:45

Description

This is occurring at

https://github.com/apache/arrow/blob/master/python/pyarrow/io.pxi#L450

This call is missing a with nogil:, the deadlock is occurring when this function attempts to reacquire the GIL to raise an exception. See discussion in ARROW-1282