Bug 1931980

Summary:	[gss][ceph-iscsigw] While enabling additional logging for ceph-iscsigw, getting the error "-bash: echo: write error: Invalid argument"
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Geo Jose <gjose>
Component:	Documentation	Assignee:	Amrita <asakthiv>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Gopi <gpatta>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.1	CC:	agunn, asakthiv, asriram, ceph-eng-bugs, ceph-qe-bugs, gpatta, hmunjulu, kdreyer, lithomas, mmurthy, sostapov, sy00454302, vereddy
Target Milestone:	---	Flags:	gpatta: needinfo+
Target Release:	4.2z2
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-16 11:20:15 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:	1966533

Description Geo Jose 2021-02-23 17:19:29 UTC

Description of problem:
 While enabling additional logging for ceph-iscsigw, getting the error "-bash: echo: write error: Invalid argument"

Version-Release number of selected component (if applicable):
 RHCS4

Steps to Reproduce:
1. Install RHCS 4 on RHEL 7/8.
2. Enable additional logging as per [a].

Reference
[a]. https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html-single/troubleshooting_guide/index#checking-iscsi-login-failures-because-data-was-not-sent_diag

Actual results:
 Getting the error "-bash: echo: write error: Invalid argument"

Expected results:
 While following the documentation, it should enable additional debug.

Comment 1 Geo Jose 2021-02-23 17:24:45 UTC

Test result
===========

## Environment 
* RHCS 4
* Red Hat Enterprise Linux Server release 7.9 (Maipo) / Red Hat Enterprise Linux release 8.2 (Ootpa)
* kernel-3.10.0-1127.el7.x86_64 / kernel-4.18.0-193.el8.x86_64



## Issue/Error
[root@ansible ~]# echo "iscsi_target_mod +p" > /sys/kernel/debug/dynamic_debug/control
-bash: echo: write error: Invalid argument
[root@ansible ~]# echo "target_core_mod +p" > /sys/kernel/debug/dynamic_debug/control
-bash: echo: write error: Invalid argument
[root@ansible ~]# echo "iscsi_target_mod -p" > /sys/kernel/debug/dynamic_debug/control
-bash: echo: write error: Invalid argument
[root@ansible ~]# echo "target_core_mod -p" > /sys/kernel/debug/dynamic_debug/control
-bash: echo: write error: Invalid argument
[root@ansible ~]#


## Documentation Reference 
https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html-single/troubleshooting_guide/index#checking-iscsi-login-failures-because-data-was-not-sent_diag
Section: "7.3. Checking iSCSI login failures because data was not sent"


## Workaround 
[root@ansible ~]# echo "module iscsi_target_mod +p" > /sys/kernel/debug/dynamic_debug/control
[root@ansible ~]# echo "module target_core_mod +p" > /sys/kernel/debug/dynamic_debug/control
[root@ansible ~]# echo "module target_core_mod -p" > /sys/kernel/debug/dynamic_debug/control
[root@ansible ~]# echo "module iscsi_target_mod -p" > /sys/kernel/debug/dynamic_debug/control
[root@ansible ~]#
The above command is working fine for me.

Comment 6 Gopi 2021-06-07 03:57:30 UTC

Hi Anjana,

I have tested as per comment#1 and the workaround part is working fine.

As per doc:
-----------
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "iscsi_target_mod +p" > /sys/kernel/debug/dynamic_debug/control
bash: echo: write error: Invalid argument
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "target_core_mod +p" > /sys/kernel/debug/dynamic_debug/control
bash: echo: write error: Invalid argument
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "iscsi_target_mod -p" > /sys/kernel/debug/dynamic_debug/control
bash: echo: write error: Invalid argument
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "target_core_mod -p" > /sys/kernel/debug/dynamic_debug/control
bash: echo: write error: Invalid argument


As per workaround:
------------------
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "module iscsi_target_mod +p" > /sys/kernel/debug/dynamic_debug/control 
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "module target_core_mod +p" > /sys/kernel/debug/dynamic_debug/control
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "module target_core_mod -p" > /sys/kernel/debug/dynamic_debug/control
[root@ceph-gopi-1622725159152-node2-osd-mon-mgr ]# echo "module iscsi_target_mod -p" > /sys/kernel/debug/dynamic_debug/control


So, document needs to be changed as per workaround.

Comment 7 Gopi 2021-06-07 03:59:58 UTC

@asriram

Comment 9 Gopi 2021-06-07 10:55:32 UTC

Changes are there in document. Moving this bug to verified state.