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Bug 1581364 - Hash operation not allowed during iteration [rhel-7.5.z]
Hash operation not allowed during iteration [rhel-7.5.z]
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt (Show other bugs)
7.4
Unspecified Unspecified
high Severity high
: rc
: ---
Assigned To: Michal Privoznik
yafu
: Upstream, ZStream
: 1571384 1577951 1592785 1596946 (view as bug list)
Depends On: 1576464
Blocks:
  Show dependency tree / graph
 
Reported: 2018-05-22 11:04 EDT by Oneata Mircea Teodor
Modified: 2018-07-04 06:50 EDT (History)
23 users (show)

See Also:
Fixed In Version: libvirt-3.9.0-14.el7_5.6
Doc Type: Bug Fix
Doc Text:
Prior to this update, guest virtual machine actions that use a python library in some cases failed and "Hash operation not allowed during iteration" error messages were logged. Several redundant thread access checks have been removed, and the problem no longer occurs.
Story Points: ---
Clone Of: 1576464
Environment:
Last Closed: 2018-06-26 12:55:29 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1997 None None None 2018-06-26 12:56 EDT

  None (edit)
Description Oneata Mircea Teodor 2018-05-22 11:04:37 EDT 
This bug has been copied from bug #1576464 and has been proposed to be backported to 7.5 z-stream (EUS).
Comment 2 Bob Fournier 2018-05-22 13:37:34 EDT 
*** Bug 1571384 has been marked as a duplicate of this bug. ***
Comment 5 Kashyap Chamarthy 2018-05-25 08:11:33 EDT 
*** Bug 1577951 has been marked as a duplicate of this bug. ***
Comment 7 yafu 2018-06-06 23:16:27 EDT 
Reproduced with libvirt-3.9.0-14.el7_5.2.x86_64.
Test steps:
1.Start a guest:
#virsh start test1

2.Do 'virsh list' in a loop:
#for i in {1..1000}; do virsh list; done

3.Open another terminal, do 'virsh domstats' in a loop:
#for i in {1..1000}; do virsh domstats; done

4.Check the libvirtd.log:
# cat /var/log/libvirt/libvirtd.log | grep -i "Hash operation not allowed during"
2018-06-07 01:57:07.673+0000: 28086: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-06-07 01:57:08.077+0000: 28079: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-06-07 01:57:08.650+0000: 28077: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-06-07 01:57:09.057+0000: 28079: error : virHashForEach:597 : Hash operation not allowed during iteration

Verified with libvirt-3.9.0-14.el7_5.6.x86_64.
Test steps:
1.Start a guest:
#virsh start test1

2.Do 'virsh list' in a loop:
#for i in {1..1000}; do virsh list; done

3.Open another terminal, do 'virsh domstats' in a loop:
#for i in {1..1000}; do virsh domstats; done

4.Check the libvirtd.log after step 2&3, no error "Hash operation not allowed during iteration":
#cat /var/log/libvirt/libvirtd.log | grep -i "Hash operation not allowed during iteration"
no output
Comment 8 yafu 2018-06-13 02:27:23 EDT 
Also test do virsh list, virsh domstats, create/destroy guest, managedsave/restore guest parallel for about 48 hours, no error report and libvirtd worked well.
Comment 9 yafu 2018-06-13 02:28:20 EDT 
According to comment 7 and comment 8, move the bug to verified.
Comment 11 Bob Fournier 2018-06-26 11:53:15 EDT 
*** Bug 1592785 has been marked as a duplicate of this bug. ***
Comment 12 errata-xmlrpc 2018-06-26 12:55:29 EDT 
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/RHSA-2018:1997
Comment 13 Bob Fournier 2018-07-04 06:50:17 EDT 
*** Bug 1596946 has been marked as a duplicate of this bug. ***
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