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Bug 1626245 - dracut-033-553 performs recursive find of /home, causing huge performance lag for patch
Summary: dracut-033-553 performs recursive find of /home, causing huge performance lag...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: microcode_ctl
Version: 7.6
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Eugene Syromiatnikov
QA Contact: Jeff Bastian
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-09-06 20:47 UTC by Marc Richter
Modified: 2021-12-10 17:23 UTC (History)
3 users (show)

Fixed In Version: microcode_ctl-2.1-46.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-10-30 09:45:55 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2018:3097 0 None None None 2018-10-30 09:48:04 UTC

Description Marc Richter 2018-09-06 20:47:06 UTC 
Created attachment 1481426 [details]
tarball of find process

Description of problem:

When updating an existing system to RHEL 7.6 HTB, dracut takes 30-60 minutes to run. The issue appears to be a recursive 'find' starting at '/' looking for specific intel microcode files/directories.

Version-Release number of selected component (if applicable):
dracut-033-553.el7.x86_64 with findutils-4.5.11-6.el7.x86_64 (RHEL 7.6 High-touch Beta version)

How reproducible:
RHEL 7.5 systems updating to RHEL 7.6 HTB via "yum update" with large NFS filesystem mounted home directories


Actual results:
upgrade takes up to an hour to run

Expected results:
much shorter upgrade cycle

Additional info:
attaching files "ps -ef" output while dracut was running, showing the 'dracut' process and its child 'find' process; a tarball of /proc/24409, which was the 'find' process in question; and 'find-output-tmpjHlZ1y', which was a file generated in /tmp/ containing stderr output from the 'find' process (and showing clearly that 'find' was traversing a mounted NFS file system of user home directories that dracut has no business getting anywhere near)
Comment 4 Lukáš Nykrýn 2018-09-06 21:30:15 UTC 
Can you please run dracut again with --debug and post here the output. It should be enough just to run dracut --debug /tmp/x.img on the upgraded system.
Comment 5 Lukáš Nykrýn 2018-09-10 08:15:57 UTC 
Based on the information provided by the customer the find was called by 
//usr/lib/dracut/modules.d/99microcode_ctl-fw_dir_override/module-setup.sh@114(install) which is not in the dracut package.

Looking at the microcode_ctl I believe that this issue is already fixed in the latest version of the package, but anyway let's switch it to them to get a confirmation.
Comment 6 Eugene Syromiatnikov 2018-09-10 09:32:06 UTC 
Yes, unfortunately, the original search command was sloppy, that should be fixed in the latest versions of the microcode_ctl package:
 * microcode_ctl-2.1-47.el7 (RHEL 7.6);
 * microcode_ctl-2.1-29.16.el7_5 (RHEL 7.5.z);
 * microcode_ctl-2.1-22.18.el7_4 (RHEL 7.4.z);
 * microcode_ctl-2.1-16.19.el7_3 (RHEL 7.3.z);
 * microcode_ctl-2.1-12.16.el7_2 (RHEL 7.2.z).
Comment 8 Jeff Bastian 2018-09-21 18:24:17 UTC 
Verified on RHEL-7.6-20180920.0 (Snapshot 5)


::::::::::::::::::::::::::::::::::
:: Before (7.6 High Touch Beta) ::
::::::::::::::::::::::::::::::::::

[root@dell-pet3420-01 ~]# rpm -q microcode_ctl
microcode_ctl-2.1-44.el7.x86_64

[root@dell-pet3420-01 ~]# cd /

[root@dell-pet3420-01 /]# mkdir -p /home/YOU/SHALL/NOT/PASS

[root@dell-pet3420-01 /]# strace -f -e trace=newfstatat \
    dracut --force /tmp/initramfs.img $(uname -r) 2>&1 |
    grep -C3 SHALL
[pid 29086] newfstatat(7, "test", {st_mode=S_IFDIR|0700, st_size=93, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(7, "YOU", {st_mode=S_IFDIR|0755, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(7, "YOU", {st_mode=S_IFDIR|0755, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(8, "SHALL", {st_mode=S_IFDIR|0755, st_size=17, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(8, "SHALL", {st_mode=S_IFDIR|0755, st_size=17, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(9, "NOT", {st_mode=S_IFDIR|0755, st_size=18, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(9, "NOT", {st_mode=S_IFDIR|0755, st_size=18, ...}, AT_SYMLINK_NOFOLLOW) = 0
[pid 29086] newfstatat(10, "PASS", {st_mode=S_IFDIR|0755, st_size=6, ...}, AT_SYMLINK_NOFOLLOW) = 0


::::::::::::::::::::::::::::
:: After (7.6 Snapshot 5) ::
::::::::::::::::::::::::::::

[root@dell-pet3420-01 /]# yum -y update microcode_ctl
...

[root@dell-pet3420-01 /]# rpm -q microcode_ctl
microcode_ctl-2.1-47.el7.x86_64

[root@dell-pet3420-01 /]# strace -f -e trace=newfstatat \
    dracut --force /tmp/initramfs.img $(uname -r) 2>&1 |
    grep -C3 SHALL

[root@dell-pet3420-01 /]#
Comment 10 errata-xmlrpc 2018-10-30 09:45:55 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/RHEA-2018:3097
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