Red Hat Bugzilla – Bug 484258
service iscsi stop: ERROR: Module iscsi_sfnet is in use
Last modified: 2012-06-20 12:09:42 EDT
Description of problem:
I have a 4TB LUN being exported by STGT on RHEL5 (scsi-target-utils-0.0-5.20080917snap.el5) and being mounted by an initiator on RHEL 4.7.
This LUN is then mapped (from /dev/sdc on the initiator) to a logical volume, set up with ext3 and mounted as /storage.
After several days, I unmounted /storage and ran 'service iscsi stop' and received the following error:
Searching for iscsi-based multipath maps
Found 0 maps
Stopping iscsid: iscsid not running
Removing iscsi driver: ERROR: Module iscsi_sfnet is in use
At this point there doesn't seem to be any way to correct stop and reload iSCSI so that the initiator will work properly again without rebooting.
I can reconnect to the target, but get lots of errors relating to a dead device, etc, and the LVM I created appears to be corrupted (although maybe it will be fine if I reboot my initiator machine).
If I try to remove the offending module manually:
# rmmod iscsi_sfnet
ERROR: Module iscsi_sfnet is in use
How can I determine what is making use of iscsi_sfnet? lsmod doesn't seem to show anything. I've run lvchange -a n on the logical volume (this gave an error).
I don't think I should need to reboot in this scenario.
Version-Release number of selected component (if applicable):
So far every time.. difficult to test as it's on a production machine.
Steps to Reproduce:
1. Export LUN from STGT on another machine.
2. Connect to LUN via RHEL 4.7 initiator.
3. Create LVM on LUN
4. Create filesystem on LUN
7. Unmount filesystem
8. Attempt to stop iscsi services.
Module errors listed above.
iscsi initiator shuts down properly and unloads itself.
Maybe I should have used the iscsi-session-kill command first?
Also have opened SR #1892946 for this.
LVM was hanging onto the device:
# dmsetup remove FTP1-LogVol00
Allowed me to successfully unload the iscsi modules and get things going again without a reboot.
Please close this NOTABUG.
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