Bug 2223897

Summary:	ReaR fails to create the rescue environment when a device is shrinking while being read
Product:	Red Hat Enterprise Linux 8	Reporter:	Renaud Métrich <rmetrich>
Component:	rear	Assignee:	Pavel Cahyna <pcahyna>
Status:	CLOSED ERRATA	QA Contact:	Jakub Haruda <jharuda>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	8.8	CC:	jharuda, ovasik, pcahyna, pdwyer
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	rear-2.6-10.el8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-11-14 15:37:10 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:	2223895
Bug Blocks:

Description Renaud Métrich 2023-07-19 08:32:36 UTC

This bug was initially created as a copy of Bug #2223895

I am copying this bug because: 

Also applies

Description of problem:

A customer hit an issue when building the ReaR ISO: the process always fails due to having a `/dev/mqueue/nnsc` which shrinks when being read, causing the verification code to (hopefully) fail.
See PR https://github.com/rear/rear/pull/3027 for details and a reproducer.

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

all rear releases

How reproducible:

Always using the attached reproducer `shrinking.stp`

Steps to Reproduce:

1. Create a file in /dev which will be embedded in the rescue environment

    # dd if=/dev/urandom of=/dev/shrinking bs=10K count=3
    3+0 records in
    3+0 records out
    30720 bytes (31 kB, 30 KiB) copied, 0.000689566 s, 44.5 MB/s

2. Execute the systemtap script in charge of shrinking the file while being copied

    # yum -y install systemtap yum-utils
    # stap-prep
    # stap -v -g ./shrinking.stp
    [...]
    Pass 5: starting run.

3. Execute rear mkrescue from another terminal

    # rear mkrescue

Actual results:

ERROR: ReaR recovery system in '/var/tmp/rear.tpfZyNy6ayS53wP/rootfs' not usable (required libraries are missing)
Some latest log messages since the last called script 990_verify_rootfs.sh:
  wipefs is /bin/wipefs
  mkfs is /bin/mkfs
  mkfs.xfs is /bin/mkfs.xfs
  xfs_admin is /bin/xfs_admin
  mkswap is /bin/mkswap
  cryptsetup is /bin/cryptsetup
  dmsetup is /bin/dmsetup
  ldconfig is /bin/ldconfig

Expected results:

No error

Comment 8 errata-xmlrpc 2023-11-14 15:37:10 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 (rear bug fix and enhancement update), 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-2023:7060