Bug 1984075

Summary:	valgrind: Fail clone3 system calls with ENOSYS
Product:	[Fedora] Fedora	Reporter:	Florian Weimer <fweimer>
Component:	valgrind	Assignee:	Mark Wielaard <mjw>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	dodji, jakub, mjw
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:	valgrind-3.17.0-9.fc35	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1984076 (view as bug list)		Environment:
Last Closed:	2021-07-22 10:24:04 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:
Bug Depends On:
Bug Blocks:	1984076

Description Florian Weimer 2021-07-20 15:18:37 UTC

glibc 2.34 tries to use the clone3 system call to create threads.

This change is already included in builds glibc-2.33.9000-44.fc35 and later (only in Koji, not tagged into the buildroot/compose).

Currently, valgrind prints a warning for every clone3 system call, which can be reproduced e.g. with Python:

$ valgrind python3
==3260== Memcheck, a memory error detector
==3260== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==3260== Using Valgrind-3.17.0 and LibVEX; rerun with -h for copyright info
==3260== Command: python3
==3260== 
Python 3.10.0b4 (default, Jul 16 2021, 00:00:00) [GCC 11.1.1 20210623 (Red Hat 11.1.1-6)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import threading
>>> threading.Thread(None, lambda: print("Thread is running")).start()
--3260-- WARNING: unhandled amd64-linux syscall: 435
--3260-- You may be able to write your own handler.
--3260-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--3260-- Nevertheless we consider this a bug.  Please report
--3260-- it at http://valgrind.org/support/bug_reports.html.
Thread is running
>>> 

The thread is still launched, but the warning is annoying.

Comment 1 Mark Wielaard 2021-07-22 10:24:04 UTC

https://bodhi.fedoraproject.org/updates/FEDORA-2021-044fbb77f3