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Re: [dm-devel] [PATCH]: scsi_dh_rdac: fix BUG_ON in get_rdac_data from within send_mode_select



Hi Babu,

I ran the tests with my earlier patch intact.

I reviewed your patches and I can see how they solve the same issue.
I also acknowledge that we have two different approaches here:
1) The patches you suggest solves the issue in a wider range (for all SCSI device handlers).
   The patches are quite complex (several pieces of code) so the potential for bugs is higher, and they will require a wider range of testing.
2) The patch I submitted solves this issue only in the RDAC hardware driver.
   Since we do have time to market issues involved, if the patch has no logical flaws and solves the problem locally I think I will apply it
   on our side.

I would like to suggest these action items:
1) After you modify the patches to fit the current code, I will test the patches here with our RDAC environment that seems quite adequate for detecting
   these problems.
2) Please review my patch and see if it has any logical flaws. I tested the patch in our test scenario a few hundreds of times and it
   I seems to be doing what it's supposed to.

Best Regards,
Menny

-----Original Message-----
From: Moger, Babu [mailto:Babu Moger lsi com]
Sent: 31 January, 2011 22:39
To: device-mapper development
Cc: Hamburger, Menny
Subject: RE: [dm-devel] [PATCH]: scsi_dh_rdac: fix BUG_ON in get_rdac_data from within send_mode_select

Menny,

 I attempted to fix this bug while ego. There were some review comments. I needed to update these patches. But, I did not get chance to update it yet. Please take a look at these patches. I will try to update these patches sometime this week.

http://marc.info/?l=linux-scsi&m=128055289415827&w=4
http://marc.info/?l=linux-scsi&m=128035832331808&w=4
http://marc.info/?l=dm-devel&m=128035824431685&w=4
http://marc.info/?l=linux-scsi&m=128035797031319&w=4
http://marc.info/?l=linux-scsi&m=128035798931356&w=4
http://marc.info/?l=linux-scsi&m=128035824431684&w=4
http://marc.info/?l=linux-scsi&m=128035800631394&w=4
http://marc.info/?l=linux-scsi&m=128035828031770&w=4


As per my understating this problem happens during the combination of path removal and mode select submission.  Did you try to check the device status (offline/del/cancel- which is your earlier patch) in scsi_dh_activate?  That might help a little bit here.

Thanks
Babu

________________________________________
From: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com] On Behalf Of Menny_Hamburger dell com
Sent: Sunday, January 30, 2011 3:22 AM
To: dm-devel redhat com
Subject: [dm-devel] [PATCH]: scsi_dh_rdac: fix BUG_ON in get_rdac_data from within send_mode_select

Hi,

We are running with multipath over MD3xxx ISCSI storage (RDAC).
Our test scripts perform a series of multipathd restarts, udevtrigger and udevsettle calls, during which we logout of the storage.
Sometimes we get the following panic:

2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-11: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: lun5: event checker started
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-11: add map (uevent)
2011 Jan 26 22:27:01 node0 MAJOR: multipathd: dm-11: devmap already registered
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-11: add map (uevent)
2011 Jan 26 22:27:01 node0 MAJOR: multipathd: dm-11: devmap already registered
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-11: add map (uevent)
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 MAJOR: multipathd: dm-11: devmap already registered
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-0: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath0: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-1: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath1: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-2: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath2: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-3: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath3: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-4: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath4: event checker started
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: lun5: event checker exit
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-5: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath6: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-6: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath7: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-7: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath8: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-8: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath9: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-9: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath10: event checker started
2011 Jan 26 22:27:01 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: dm-10: add map (uevent)
2011 Jan 26 22:27:01 node0 NOTICE: multipathd: mpath11: event checker started
2011 Jan 26 22:27:02 node0 INFO: kernel: sd 194:0:0:4: rdac: array MD3200i-c7-d7, ctlr 0, queueing MODE_SELECT command
2011 Jan 26 22:27:02 node0 DEBUG: hba_loader:iscsi_logout:1130: Started
2011 Jan 26 22:27:02 node0 DEBUG: hba_loader:iscsi_logout:1130: iscsi_luns_num=1 logout_iqn=
2011 Jan 26 22:27:02 node0 DEBUG: hba_loader:iscsi_logout:1130: Performing logout of all iSCSI nodes
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:0: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:1: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:0: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:2: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:3: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:1: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:4: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:2: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:5: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:0: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: multipathd: sdb: remove path (uevent)
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:3: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:1: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:4: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:2: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:3: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:5: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:4: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:6: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:5: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:6: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:7: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:7: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:8: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:8: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:9: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:9: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:6: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:10: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:7: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:8: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 196:0:0:11: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:9: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:10: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 194:0:0:11: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:0: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 195:0:0:10: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:1: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:2: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:3: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:4: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:5: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:6: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:7: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:8: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:9: rdac Dettached
2011 Jan 26 22:27:02 node0 NOTICE: kernel: scsi 193:0:0:10: rdac Dettached
2011 Jan 26 22:27:02 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:02 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:02 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:02 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:02 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:02 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:02 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:02 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:02 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:02 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:02 node0 MAJOR: multipathd: mpath8: failed in domap for removal of path sdb
2011 Jan 26 22:27:02 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:02 node0 NOTICE: multipathd: sdd: remove path (uevent)
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:02 node0 MAJOR: multipathd: mpath9: failed in domap for removal of path sdd
2011 Jan 26 22:27:02 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:02 node0 NOTICE: multipathd: sdh: remove path (uevent)
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath8: failed in domap for removal of path sdh
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdf: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath10: failed in domap for removal of path sdf
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdo: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath9: failed in domap for removal of path sdo
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdj: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: scsi 194:0:0:8: rejecting I/O to dead device
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: multipath: Failing path 65:112.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: scsi 195:0:0:8: rejecting I/O to dead device
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: multipath: Failing path 65:160.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: multipath: Cannot failover device because scsi_dh_rdac was not loaded.
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: multipath: Failing path 66:208.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: multipath: Cannot failover device because scsi_dh_rdac was not loaded.
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: multipath: Failing path 66:224.
2011 Jan 26 22:27:03 node0 WARNING: kernel: printk: 46 messages suppressed.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 0
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 1
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 2
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 3
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 0
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 70778879
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 70778879
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 0
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 0
2011 Jan 26 22:27:03 node0 MAJOR: kernel: Buffer I/O error on device dm-0, logical block 3
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath11: failed in domap for removal of path sdj
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdl: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath3: failed in domap for removal of path sdl
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: 65:160: mark as failed
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: mpath0: remaining active paths: 3
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: 65:112: mark as failed
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: mpath0: remaining active paths: 2
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: 66:208: mark as failed
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: mpath0: remaining active paths: 1
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: 66:224: mark as failed
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: mpath0: remaining active paths: 0
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdt: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath10: failed in domap for removal of path sdt
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdn: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath4: failed in domap for removal of path sdn
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdy: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath11: failed in domap for removal of path sdy
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdc: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:7: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath8: failed in domap for removal of path sdc
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sde: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:8: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath9: failed in domap for removal of path sde
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdaf: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath3: failed in domap for removal of path sdaf
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdg: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:9: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath10: failed in domap for removal of path sdg
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdah: remove path (uevent)
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath4: failed in domap for removal of path sdah
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdk: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:10: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath11: failed in domap for removal of path sdk
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:3: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdm: remove path (uevent)
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath3: failed in domap for removal of path sdm
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdan: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:5: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:5: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath6: failed in domap for removal of path sdan
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdq: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:4: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath4: failed in domap for removal of path sdq
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:6: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:6: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdap: remove path (uevent)
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath7: failed in domap for removal of path sdap
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sds: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:5: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:5: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: mpath6: failed in domap for removal of path sds
2011 Jan 26 22:27:03 node0 MAJOR: multipathd: uevent trigger error
2011 Jan 26 22:27:03 node0 NOTICE: multipathd: sdw: remove path (uevent)
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 node0 MAJOR: kernel: device-mapper: table: 253:6: multipath: unknown path selector type
2011 Jan 26 22:27:03 node0 WARNING: kernel: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 node0 INFO: kernel: device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for failover/failback and device management.
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ----------- [cut here ] --------- [please bite here ] ---------
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Kernel BUG at drivers/scsi/device_handler/scsi_dh_rdac.c:252
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: invalid opcode: 0000 [1]
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: SMP
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: last sysfs file: /class/iscsi_session/session9/ifacename
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: CPU 2
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Modules linked in:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: iscsi_tcp(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: libiscsi_tcp(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: libiscsi2(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_transport_iscsi2(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_transport_iscsi(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ipmi_si(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_dh_rdac(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_rdac(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_queue_depth(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: netconsole(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_round_robin(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: mptctl(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dell_rbu(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: exa_ioctls(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: nfs(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: lockd(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: nfs_acl(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: xt_tcpudp(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: iptable_filter(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ip_tables(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ipt_SYSRQ(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: x_tables(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: sunrpc(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ipmi_devintf(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ipmi_msghandler(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: bonding1(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: bonding(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ipv6(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: xfrm_nalgo(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: crypto_api(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_mirror(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_log(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_multipath(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_dh(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: dm_mod(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: video(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: hwmon(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: backlight(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: sbs(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: i2c_ec(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: i2c_core(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: button(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: battery(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: asus_acpi(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ac(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: joydev(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: sr_mod(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: cdrom(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: bnx2(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: sg(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: pcspkr(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ata_piix(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: libata(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: mptsas(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: mptscsih(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: mptbase(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_transport_sas(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: sd_mod(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: scsi_mod(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ext3(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: jbd(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: uhci_hcd(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ohci_hcd(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ehci_hcd(U)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Pid: 12912, comm: kmpath_rdacd Tainted: G      2.6.18-164sys #1
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RIP: 0010:[<ffffffff8838dc4f>]
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff8838dc4f>] :scsi_dh_rdac:send_mode_select+0x2cf/0x4b0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: device-mapper: table: 253:6: multipath: unknown path selector type
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: device-mapper: ioctl: error adding target to table
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RSP: 0018:ffff810086959d80  EFLAGS: 00010246
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RAX: 0000000000000000 RBX: 00000000fffffffb RCX: 0000000000000000
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RDX: 0000000000000800 RSI: 0000000000000286 RDI: ffff810055e2d800
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RBP: ffff81005a647216 R08: ffffffff80370b58 R09: 0000000000000001
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: R10: 0000000000000046 R11: ffffffff8004c200 R12: 0000000000000000
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: R13: 0000000000000000 R14: ffff8102352bc000 R15: ffff8102352bc062
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: FS:  0000000000000000(0000) GS:ffff810107eda340(0000) knlGS:0000000000000000
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: CR2: 00002ae8ff6760a0 CR3: 000000023487c000 CR4: 00000000000006e0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Process kmpath_rdacd (pid: 12912, threadinfo ffff810086958000, task ffff810092a54140)
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Stack:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0000000010008040
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff81005b23a5c0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff810086959e70
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff810086959dd0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff810001004498
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff810055e2d800
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff81005a647208
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff81004d3226f0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0000000380438420
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0000000000000001
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff81023a498d80
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: ffff81023a498d80
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Call Trace:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff8838d980>] :scsi_dh_rdac:send_mode_select+0x0/0x4b0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff800561a3>] run_workqueue+0xb3/0x110
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff80052180>] worker_thread+0x0/0x150
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff800b33b0>] keventd_create_kthread+0x0/0xa0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff80052291>] worker_thread+0x111/0x150
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff8009ca00>] default_wake_function+0x0/0x10
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff80052180>] worker_thread+0x0/0x150
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff800373c9>] kthread+0xd9/0x120
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff80068fb1>] child_rip+0xa/0x11
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff800b33b0>] keventd_create_kthread+0x0/0xa0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff800372f0>] kthread+0x0/0x120
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff80068fa7>] child_rip+0x0/0x11
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: Code:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0f
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0b
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 68
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 98
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: e1
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 38
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 88
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: c2
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: fc
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 00
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 0f
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 1f
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 80
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 00
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 00
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 00
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 00
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 48
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 8d
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: 54
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RIP
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: [<ffffffff8838dc4f>] :scsi_dh_rdac:send_mode_select+0x2cf/0x4b0
2011 Jan 26 22:27:03 172.19.59.130 NOTICE: RSP <ffff810086959d80>
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 EMERG: Kernel panic - not syncing: Fatal exception
2011 Jan 26 22:27:03 172.19.59.130 NOTICE:
2011 Jan 26 22:27:03 172.19.59.130 EMERG: Rebooting in 1 seconds..


This panic comes from get_rdac_data, which is called from within the send_mode_select code.
My analysis picked up the following problem:
The RDAC detach code nullifies the scsi_dh_data before flushing the mode select workqueue, and as result a pending send_mode_select will BUG_ON in get_rdac_data.
The following patch (tested over RHEL54) flushes the workqueue before setting scsi_dh_data to NULL:

diff -r -U 2 a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c        2011-01-30 11:02:31.271426000 +0200
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c        2011-01-30 11:02:31.327069000 +0200
@@ -853,8 +853,22 @@
        spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
        scsi_dh_data = retrieve_scsi_dh_data(sdev);
-       store_scsi_dh_data(sdev, NULL);
        spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);

        h = (struct rdac_dh_data *) scsi_dh_data->buf;
+       if (h->ctlr) {
+               int flush;
+
+               spin_lock(&h->ctlr->ms_lock);
+               flush = (h->ctlr->ms_sdev == sdev);
+               spin_unlock(&h->ctlr->ms_lock);
+
+               if (flush)
+                       flush_workqueue(kmpath_rdacd);
+       }
+
+       spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+       store_scsi_dh_data(sdev, NULL);
+       spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
        if (h->ctlr)
                kref_put(&h->ctlr->kref, release_controller);



The patch ensures that we run flush only when detaching the device the "owns" the send_mode_select (ms_sdev).

Menny





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