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Bug 2126714

Summary: Multipath segfault after running newest patched version
Product: Red Hat Enterprise Linux 8 Reporter: ggrimaux
Component: device-mapper-multipathAssignee: Ben Marzinski <bmarzins>
Status: CLOSED ERRATA QA Contact: Lin Li <lilin>
Severity: high Docs Contact:
Priority: high    
Version: 8.2CC: agk, bmarzins, cwei, fboboc, gconsalv, heinzm, jmagrini, ltamagno, msnitzer, prajnoha, zkabelac
Target Milestone: rcKeywords: Triaged, ZStream
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: device-mapper-multipath-0.8.4-34.el8 Doc Type: Bug Fix
Doc Text:
Cause: When paths were removed, multipathd could free the array of matching device config entries for a multipath device, while the device still pointed to it Consequence: multipathd could occasionally crash after path removal Fix: multipathd now makes sure that the device config list no longer points to freed memory. Result: multipathd not longer crashes after path removal
 Story Points: ---
Clone Of:
: 2161393 2161394 2161395 2161396 (view as bug list) Environment:
Last Closed: 2023-05-16 08:44:49 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:    
Bug Blocks: 2161393, 2161394, 2161395, 2161396    

Description ggrimaux 2022-09-14 10:12:45 UTC 
Description of problem:
Client recently updated their RHEL8.2 with this version of multipathd:
https://bugzilla.redhat.com/show_bug.cgi?id=1946940
https://bugzilla.redhat.com/show_bug.cgi?id=2101534

Its installed on many nodes and it just crashed with this:
Sep 13 15:06:25 compute kernel: multipathd[585455]: segfault at 4449 ip 00007fb44d96ea2e sp 00007fb44dd247b8 error 4 in libmultipath.so.0[7fb44d92d000+5c000]
Sep 13 15:06:25 compute kernel: Code: 66 90 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 85 ff 74 06 31 c0 66 89 47 14 c3 f3 0f 1e fa 48 85 f6 74 17 48 85 d2 74 05 <80> 3a 00 75 15 48 c7 06 00 00 00 00 c3 0f 1f 44 00 00 c3 0f 1f 80
Sep 13 15:06:25 compute systemd[1]: multipathd.service: Main process exited, code=killed, status=11/SEGV
Sep 13 15:06:25 compute systemd[1]: multipathd.service: Failed with result 'signal'.

We need your help to see if its related to this new patch/version or its a new issue entirely

Thank you.

Version-Release number of selected component (if applicable):
RHEL8.2
device-mapper-multipath-0.8.3-3.el8_2.5.x86_64              Tue Sep  6 09:35:35 2022
device-mapper-multipath-libs-0.8.3-3.el8_2.5.x86_64         Tue Sep  6 09:35:34 2022


How reproducible:
Happened once so far

Steps to Reproduce:
1. N/A
2.
3.

Actual results:
multipathd crashed

Expected results:
multipathd doesn't crash

Additional info:
We have sosreport from the node where the crash happened
Comment 2 Ben Marzinski 2022-09-14 15:59:22 UTC 
You don't happen to have the coredump, do you? This will be much easier to debug if I can see the state it was in when it crashed.
Comment 3 Ben Marzinski 2022-09-14 17:09:23 UTC 
It might also be useful to have the device-mapper-multipath-debuginfo package installed.
Comment 29 errata-xmlrpc 2023-05-16 08:44:49 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 (Moderate: device-mapper-multipath security and bug fix 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/RHSA-2023:2948