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Bug 1371301

Summary:	File descriptor leak due to temporary file descriptors creation in src/closures.c
Product:	Red Hat Enterprise Linux 7	Reporter:	Kyle Walker <kwalker>
Component:	libffi	Assignee:	Andrew Haley <aph>
Status:	CLOSED WONTFIX	QA Contact:	qe-baseos-tools-bugs
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	cww, fweimer
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-30 22:39:56 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Kyle Walker 2016-08-29 20:31:33 UTC

Description of problem:
 Processes that make use of the libffi dlmmap() codepath, such as python's cTypes module, result in a file descriptor remaining for the duration of the process. This is visible in lsof output as a "(deleted)" temporary file descriptor.

Version-Release number of selected component (if applicable):
 libffi-3.0.13-16.el7.x86_64

How reproducible:
 Easily

Steps to Reproduce:
1. Start a python application that makes use of the ctypes module, and subsequently libffi library, such as "tuned".
2. Verify if the process contains a "(deleted)" temporary file descriptor
3.

Actual results:
 An entry is present similar to:
   COMM PID root 6u REG 253,0 4096 51133553 /tmp/ffiEmToG6 (deleted)

Expected results:
 No deleted, and unnecessary file descriptors

Additional info:
 The file descriptor above is not needed as the underlying dlmmap_locked function call maps the file descriptor into the addressable space for the process and is not needed.