Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1352674

Summary: [RHELSA-7.3] 4.5.0-0.43.el7 module-load tested LWD
Product: Red Hat Enterprise Linux 7 Reporter: PaulB <pbunyan>
Component: kernel-aarch64Assignee: Iyappan Subramanian <isubrama>
kernel-aarch64 sub component: Platform Enablement QA Contact: Jeff Bastian <jbastian>
Status: CLOSED NOTABUG Docs Contact:
Severity: high    
Priority: high CC: bpeck, ctatman, jbastian, jcm, jfeeney, mlangsdo, msalter, pbunyan
Version: 7.3   
Target Milestone: rc   
Target Release: ---   
Hardware: aarch64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-09-12 18:37:40 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: 1250212    

Description PaulB 2016-07-04 16:49:40 UTC 
Description of problem:
We hit LWD during  /kernel/misc/module-load,
due to defunct process.
 modprobe        D fffffe000009463c     0 17063  17020 0x00000200

Version-Release number of selected component (if applicable):
 distro: RHEL-7.3-20160629.n.0 Server aarch64
 kernel: 4.5.0-0.43.el7 
 task: /kernel/misc/module-load 1.4-23

How reproducible:
 unknown

Steps to Reproduce:
1. Install ARM host with  distro: RHEL-7.3-20160629.n.0 Server aarch64
2. Install kernel 4.5.0-0.43.el7 
3. Run /kernel/misc/module-load 1.4-23

Actual results:
https://beaker.engineering.redhat.com/jobs/1390332
https://beaker.engineering.redhat.com/recipes/2841022#task42630139
http://beaker-archive.app.eng.bos.redhat.com/beaker-logs/2016/07/13903/1390332/2841022/console.log
---<-snip->---
[  528.711245] restraintd[4942]: ** Running task: 42630139 [/kernel/misc/module-load] 
** Attempting to load 8021q... ** 
[  528.921768] 8021q: 802.1Q VLAN Support v1.8 
** Attempting to unload 8021q... ** 
[  589.043663] restraintd[4942]: *** Current Time: Sat Jul 02 02:38:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  649.090509] restraintd[4942]: *** Current Time: Sat Jul 02 02:39:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[-- MARK -- Sat Jul  2 06:40:00 2016] 
[  709.094700] restraintd[4942]: *** Current Time: Sat Jul 02 02:40:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  720.083748] INFO: task modprobe:17063 blocked for more than 120 seconds. 
[  720.090432]       Tainted: G        W   E  ------------   4.5.0-0.43.el7.aarch64 #1 
[  720.098058] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
[  720.105858] modprobe        D fffffe000009463c     0 17063  17020 0x00000200 
[  720.112907] Call trace: 
[  720.115353] [<fffffe000009463c>] __switch_to+0x5c/0x68 
[  720.120486] [<fffffe0000785fd8>] __schedule+0x1d8/0x68c 
[  720.125702] [<fffffe00007864c4>] schedule+0x38/0x90 
[  720.130563] [<fffffe0000788f14>] schedule_timeout+0x18c/0x244 
[  720.136296] [<fffffe000010baa4>] wait_woken+0x54/0x94 
[  720.141332] [<fffffe0000659028>] rtnl_link_unregister+0x108/0x10c 
[  720.147416] [<fffffdfffc8e3538>] vlan_netlink_fini+0x10/0x20 [8021q] 
[  720.153751] [<fffffdfffc8e34ec>] vlan_cleanup_module+0x2c/0x68 [8021q] 
[  720.160263] [<fffffe0000146a60>] SyS_delete_module+0x1e8/0x23c 
[  720.166075] [<fffffe0000091a8c>] __sys_trace_return+0x0/0x4 
[  769.092057] restraintd[4942]: *** Current Time: Sat Jul 02 02:41:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  829.089556] restraintd[4942]: *** Current Time: Sat Jul 02 02:42:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  840.172916] INFO: task modprobe:17063 blocked for more than 120 seconds. 
[  840.179598]       Tainted: G        W   E  ------------   4.5.0-0.43.el7.aarch64 #1 
[  840.187226] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 
[  840.195027] modprobe        D fffffe000009463c     0 17063  17020 0x00000200 
[  840.202079] Call trace: 
[  840.204523] [<fffffe000009463c>] __switch_to+0x5c/0x68 
[  840.209656] [<fffffe0000785fd8>] __schedule+0x1d8/0x68c 
[  840.214874] [<fffffe00007864c4>] schedule+0x38/0x90 
[  840.219747] [<fffffe0000788f14>] schedule_timeout+0x18c/0x244 
[  840.225483] [<fffffe000010baa4>] wait_woken+0x54/0x94 
[  840.230526] [<fffffe0000659028>] rtnl_link_unregister+0x108/0x10c 
[  840.236603] [<fffffdfffc8e3538>] vlan_netlink_fini+0x10/0x20 [8021q] 
[  840.242946] [<fffffdfffc8e34ec>] vlan_cleanup_module+0x2c/0x68 [8021q] 
[  840.249452] [<fffffe0000146a60>] SyS_delete_module+0x1e8/0x23c 
[  840.255274] [<fffffe0000091a8c>] __sys_trace_return+0x0/0x4 
[  889.094210] restraintd[4942]: *** Current Time: Sat Jul 02 02:43:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  949.058661] restraintd[4942]: *** Current Time: Sat Jul 02 02:44:15 2016 Localwatchdog at: Sat Jul 02 03:37:14 2016 
[  960.261846] INFO: task modprobe:17063 blocked for more than 120 seconds. 
---<-snip->---

Expected results:
 successful completion of module-load task

Additional info:
Comment 3 Mark Langsdorf 2016-07-22 14:34:05 UTC 
Iyappan, please see if you can reproduce this and if so, resolve it.
Comment 4 John Feeney 2016-08-12 18:49:10 UTC 
This is another A3 Mustang. Can I assume it has not been seen on a B0, Merlin or any other system we test on?
Comment 7 Jon Masters 2016-08-29 18:31:23 UTC 
Let's see how this goes with a -5 kernel.
Comment 9 Chris Tatman 2016-09-12 18:37:40 UTC 
Closing this one as fixed per discussion today.

--Chris