Bug 1324387

Summary:	libtevent leaks memory during signal handling
Product:	Red Hat Enterprise Linux 7	Reporter:	Marcel Kolaja <mkolaja>
Component:	libtevent	Assignee:	Jakub Hrozek <jhrozek>
Status:	CLOSED ERRATA	QA Contact:	Steeve Goveas <sgoveas>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	7.3	CC:	apeetham, asn, enewland, gagriogi, jhrozek, mkolaja, msauton, pbokoc, pbrezina, sgoveas, tscherf
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libtevent-0.9.26-1.el7_2.1	Doc Type:	Bug Fix
Doc Text:	Previously, the libtevent package suffered from a memory leak in signal handling. This bug has been fixed and memory leaks no longer occur in libtevent.	Story Points:	---
Clone Of:	1309439	Environment:
Last Closed:	2016-05-12 10:06:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1309439
Bug Blocks:

Description Marcel Kolaja 2016-04-06 08:50:06 UTC

This bug has been copied from bug #1309439 and has been proposed
to be backported to 7.2 z-stream (EUS).

Comment 4 Amith 2016-04-27 12:50:29 UTC

Verified the bug on libtevent Version: libtevent-0.9.26-1.el7_2.1.x86_64

Steps followed during verification:
1. Reproduced the bug with the older build: libtevent-0.9.25-1.el7.x86_64
2. Upon executing the reproducer program with unpatched package, following leaks were reported: 

# ./a.out 
full talloc report on 'null_context' (total  18128 bytes in 107 blocks)
    struct tevent_sig_state        contains  17968 bytes in 101 blocks (ref 0) 0x1590680
        struct sigaction               contains    152 bytes in   1 blocks (ref 0) 0x159f7b0
        struct sigaction               contains    152 bytes in   1 blocks (ref 0) 0x159f6b0
        struct sigaction               contains    152 bytes in   1 blocks (ref 0) 0x159f5b0
        .
        .
        .
        struct sigaction               contains    152 bytes in   1 blocks (ref 0) 0x15996b0
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x1590320
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x1590290
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x1590200
    
3. With the patched build, the "struct sigaction" shouldn't be reported, see the output:

# ./a.out 
full talloc report on 'null_context' (total   2928 bytes in   7 blocks)
    struct tevent_sig_state        contains   2768 bytes in   1 blocks (ref 0) 0x97e680
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x97e320
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x97e290
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x97e200
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x97e170
    struct tevent_ops_list         contains     32 bytes in   1 blocks (ref 0) 0x97e0e0

Comment 6 errata-xmlrpc 2016-05-12 10:06:52 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-1037.html