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Bug 1488030

Summary: [NMCI][abrt] [faf] ip6_config_merge_and_apply() infinite recursion causing a stack overrun
Product: Red Hat Enterprise Linux 8 Reporter: Vladimir Benes <vbenes>
Component: NetworkManagerAssignee: Beniamino Galvani <bgalvani>
Status: CLOSED ERRATA QA Contact: Desktop QE <desktop-qa-list>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.3CC: acardace, aloughla, atragler, bgalvani, fgiudici, lrintel, rkhan, sukulkar, thaller, till
Target Milestone: pre-dev-freezeFlags: pm-rhel: mirror+
Target Release: 8.3   
Hardware: Unspecified   
OS: Unspecified   
URL: http://faf.lab.eng.brq.redhat.com/faf/reports/bthash/ce4bfb94c491757e19887e6af81db862fe6a1ea3/
Whiteboard:
Fixed In Version: NetworkManager-1.25.1-1.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-04 01:48:18 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:

Description Vladimir Benes 2017-09-04 07:45:49 UTC
This bug has been created based on an anonymous crash report requested by the package maintainer.

Report URL: http://faf.lab.eng.brq.redhat.com/faf/reports/bthash/ce4bfb94c491757e19887e6af81db862fe6a1ea3/

Comment 2 Thomas Haller 2017-09-04 10:20:23 UTC
the issue here is a stack-overflow due to (unlimited) recursive calls of

  ip6_config_merge_and_apply (nm-device.c)
  nm_device_set_ip6_config (nm-device.c)
  device_ip6_config_changed (nm-policy.c)
  update_ip6_dns (nm-policy.c)
  nm_device_copy_ip6_dns_config (nm-policy.c)
  ip6_config_merge_and_apply (nm-device.c)
  ...


I think the immediate issue should be fixed by https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=4adda2b79a946c41ef03239e3060c94b1c114cc9 (and all test failures so far pre-date this commit).



We still should avoid unbound recursion. In this case it was introduced by IPv6 prefix-delegation (https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=ec12fcf6bf4f306d426271c286db3c28b7025ba4), hence, over to Lubomir :)

Comment 3 Marcelo Ricardo Leitner 2019-07-03 15:10:59 UTC
Mass-moving bugs RHEL <= 7.6.0 to 7.7.0.
As we are past RFE deadline for 7.7.0 and we should have no new features on 7.8.0, please evaluate if it's still wanted on RHEL7 and contact PM for exception. You may also move it to RHEL8 if that's wanted. Thanks!

Comment 8 Vladimir Benes 2020-05-20 10:54:53 UTC
FAF hasn't reported any more issues lately, we do consider this fixed.

Comment 11 errata-xmlrpc 2020-11-04 01:48:18 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 (NetworkManager 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-2020:4499