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[Bug 849753] New: SATA Hotplug not working correctly / full system lockup
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Sun, 10 Nov 2013 11:56:51 +0000
  • Message-id: <bug-849753-21960@http.bugzilla.novell.com/>

https://bugzilla.novell.com/show_bug.cgi?id=849753

https://bugzilla.novell.com/show_bug.cgi?id=849753#c0


Summary: SATA Hotplug not working correctly / full system
lockup
Classification: openSUSE
Product: openSUSE 12.3
Version: Final
Platform: x86-64
OS/Version: Linux
Status: NEW
Severity: Major
Priority: P5 - None
Component: Hotplug
AssignedTo: bnc-team-screening@xxxxxxxxxxxxxxxxxxxxxx
ReportedBy: mantel@xxxxxxxx
QAContact: qa-bugs@xxxxxxx
Found By: Development
Blocker: ---


I'm using SATA hotplug since years for backup purposes. After I built a new
system this does no longer work correctly: I inserted a harddisk into the tray
and issued something like

echo - - - > /sys/class/scsi_host/host1/scan

but the disk is not detected. I double checked cabling and tested with various
disks, but always the same result.

Finally I tested what happens when a disk is present during boot. And voila,
disk is detected and I can even change the disk and it gets detected correctly
after issuing above command. Of course I can live with this restriction, but
being able to add a disk while the system is running provides much more
flexibility. And it is even vital for producers of NAS systems like Qnap (who
offer the possibility of expanding storage).

After removing the last backup disk I wanted to notify the system about the
removal of the disk, so I issued the command

echo 1 > /sys/block/sdc/device/delete

After a few seconds the system locked up totally, switched back to console and
the keyboard LEDs started to blink. The panic message was not logged into the
syslog, so I cannot provide it. If it is useful, I could reproduce it and use a
camera to catch it. But the last messages clearly indicated that it was related
to the ATA subsystem.

Please note that I definitely used the correct device, as I still had some
seconds before the lockup and "lsscsi" clearly told me that the correct disk
had been removed.

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