Bug 1660759

Summary:	strace prints "xlat_idx: Unexpected xlat value 0 at index 4" messages
Product:	Red Hat Enterprise Linux 8	Reporter:	Renaud Métrich <rmetrich>
Component:	strace	Assignee:	Eugene Syromiatnikov <esyr>
strace sub component:	system-version	QA Contact:	Edjunior Barbosa Machado <emachado>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	low
Priority:	low	CC:	emachado, law, ohudlick, skozina
Version:	8.0
Target Milestone:	rc
Target Release:	8.0
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	strace-4.24-4.el8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1666405 (view as bug list)		Environment:
Last Closed:	2019-11-05 22:33:07 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:	1682600
Bug Blocks:	1696304

Description Renaud Métrich 2018-12-19 07:45:15 UTC

Description of problem:

When stracing systemd (PID 1), I can see the following message:

# strace -fttTvyy -o systemd.strace -s 1024 -p 1
strace: Process 1 attached
...
strace: xlat_idx: Unexpected xlat value 0 at index 4


Version-Release number of selected component (if applicable):

strace-4.24-2.el8.x86_64


How reproducible:

Always


Steps to Reproduce:
1. strace systemd

  # strace -fttTvyy -o systemd.strace -s 1024 -p 1

2. restart systemd-logind

  # systemctl restart systemd-logind.service

Actual results:

strace: Process 1 attached
strace: Process 1901 attached
strace: xlat_idx: Unexpected xlat value 0 at index 4

Expected results:

strace: Process 1 attached
strace: Process 1901 attached

Comment 1 Eugene Syromiatnikov 2019-01-15 15:24:14 UTC

Fixed in upstream:
https://gitlab.com/strace/strace/commit/8a5feb1cb331441d1b721b6455ee95b50258dbac "evdev: fix off-by-one error in decode_bitset"

Related commits:
https://gitlab.com/strace/strace/commit/b2c63fa8973442747de715ff5ff5340383e7b69d "nlattr: fix off-by-one error in indexed xlat lookup"
https://gitlab.com/strace/strace/commit/986a55423eb8e16a7cd0b249ce8e18465f0650f4 "aio: fix off-by-one error in indexed xlat lookup"
https://gitlab.com/strace/strace/commit/d0ae0b3dcabfd61dd2134422114570862fdca283 "rtnl_link: fix off-by-one errors in indexed and sorted xlat lookups"
https://gitlab.com/strace/strace/commit/b967e34d70895b799d16f5d45a9a5228d7eb73a3 "xlat_idx: do not issue warnings for holes in indices"
https://gitlab.com/strace/strace/commit/99300f217b7870fcaa752e1350a33cf98d61a993 "evdev: fix decoding of bit sets"
https://gitlab.com/strace/strace/commit/5ee385e2eb9288ae49e07dca67e576abb2e10fea "evdev: fix decoding of EVIOCGBIT(0, ...)"

Comment 5 errata-xmlrpc 2019-11-05 22:33:07 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://access.redhat.com/errata/RHBA-2019:3642