dm-multipath: kernel paniced when I pull out one HBA card

[孙俊伟 <sunjw@onewaveinc.com>]

Hello, all

I'm testing the DM multipath. 
I use the packages as follows:
kernel 2.6.14.2
device-mapper.1.01.05
multipath-tools-0.4.6
udev-058-1

I created the dm device as:
create: 3600d0230006927de000001618fecaf00
[size=476 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [prio=1]
 \_ 0:0:0:0 sda 8:0  [undef] [ready]
\_ round-robin 0 [prio=1]
 \_ 1:0:0:0 sdb 8:16 [undef] [ready]

Then, I tried the command: dd if=/dev/dm-0 of=/dev/null
I saw only the device /dev/sda was readed. It's OK.

but when I pull out the HBA which related to /dev/sdb for about 1 minute,and then plug it in again,
the kernel paniced.

the messages are as follows:
Dec 22 05:25:07 nd02 kernel: qla2300 0000:07:01.1: LIP reset occured (f823).
Dec 22 05:25:07 nd02 kernel: qla2300 0000:07:01.1: LIP occured (f823).
Dec 22 05:25:07 nd02 kernel: qla2300 0000:07:01.1: LOOP DOWN detected (2).
Dec 22 05:25:42 nd02 kernel:  rport-1:0-1: blocked FC remote port time out: removing target
Dec 22 05:25:42 nd02 multipathd: 8:16: readsector0 checker reports path is down
Dec 22 05:25:42 nd02 multipathd: checker failed path 8:16 in map 3600d0230006927de000001618fecaf00
Dec 22 05:25:42 nd02 kernel: device-mapper: dm-multipath: Failing path 8:16.
Dec 22 05:25:42 nd02 multipathd: 3600d0230006927de000001618fecaf00: remaining active paths: 1
Dec 22 05:25:43 nd02 multipathd: remove sdb path checker
Dec 22 05:25:43 nd02 kernel: Synchronizing SCSI cache for disk sdb:
Dec 22 05:25:43 nd02 kernel: FAILED
Dec 22 05:25:43 nd02 kernel:   status = 0, message = 00, host = 1, driver = 00
Dec 22 05:26:12 nd02 kernel:   <6>qla2300 0000:07:01.1: LIP reset occured (f8f7).
Dec 22 05:26:12 nd02 kernel: qla2300 0000:07:01.1: LIP occured (f8f7).
Dec 22 05:26:12 nd02 kernel: qla2300 0000:07:01.1: LOOP UP detected (2 Gbps).
Dec 22 05:26:13 nd02 kernel:   Vendor: TOYOU     Model: NetStor DA9220F   Rev: 342R
Dec 22 05:26:13 nd02 kernel:   Type:   Direct-Access                      ANSI SCSI revision: 03
Dec 22 05:26:13 nd02 kernel: SCSI device sdc: 999950336 512-byte hdwr sectors (511975 MB)
Dec 22 05:26:13 nd02 kernel: SCSI device sdc: drive cache: write back
Dec 22 05:26:13 nd02 kernel: SCSI device sdc: 999950336 512-byte hdwr sectors (511975 MB)
Dec 22 05:26:14 nd02 kernel: SCSI device sdc: drive cache: write back
Dec 22 05:26:14 nd02 kernel:  sdc:
Dec 22 05:26:14 nd02 kernel: Attached scsi disk sdc at scsi1, channel 0, id 0, lun 0
Dec 22 05:26:14 nd02 kernel: Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0,  type 0
Dec 22 05:26:14 nd02 scsi.agent[4098]: disk at /devices/pci0000:00/0000:00:02.0/0000:05:1d.0/0000:07:01.1/host1/rport-1:0-1/target1:0:0/1:0:0:0

--------------------->> All right above here.

Dec 22 05:26:14 nd02 kernel:   Vendor: TOYOU     Model: NetStor DA9220F   Rev: 342R
Dec 22 05:26:14 nd02 kernel:   Type:   Direct-Access                      ANSI SCSI revision: 03
Dec 22 05:26:14 nd02 kernel: error 1
Dec 22 05:26:14 nd02 kernel: scsi: Unexpected response from host 1 channel 0 id 0 lun 0 while scanning, scan aborted
Dec 22 05:26:14 nd02 kernel: Badness in kref_get at lib/kref.c:32
Dec 22 05:26:14 nd02 kernel:  [<c01d9c6a>] kref_get+0x3f/0x41
Dec 22 05:26:14 nd02 kernel:  [<c01d92e0>] kobject_get+0x17/0x1e
Dec 22 05:26:14 nd02 kernel:  [<c019d896>] sysfs_getlink+0x38/0xfa
Dec 22 05:26:14 nd02 kernel:  [<c019d999>] sysfs_follow_link+0x41/0x59
Dec 22 05:26:14 nd02 kernel:  [<c016ee2f>] generic_readlink+0x2a/0x85
Dec 22 05:26:14 nd02 kernel:  [<c017fc72>] __mark_inode_dirty+0x52/0x1a8
Dec 22 05:26:14 nd02 kernel:  [<c012332f>] current_fs_time+0x59/0x67
Dec 22 05:26:14 nd02 kernel:  [<c0177e61>] update_atime+0x67/0x8c
Dec 22 05:26:14 nd02 kernel:  [<c01674b5>] sys_readlink+0x7e/0x82
Dec 22 05:26:14 nd02 kernel:  [<c0103af3>] sysenter_past_esp+0x54/0x75
Dec 22 05:26:17 nd02 kernel: Unable to handle kernel paging requestBadness in kref_get at lib/kref.c:32
Dec 22 05:26:17 nd02 kernel:  [<c01d9c6a>] kref_get+0x3f/0x41
Dec 22 05:26:17 nd02 kernel:  [<c01d92e0>] kobject_get+0x17/0x1e
Dec 22 05:26:17 nd02 kernel:  [<c019d896>] sysfs_getlink+0x38/0xfa
Dec 22 05:26:17 nd02 kernel:  [<c019d999>] sysfs_follow_link+0x41/0x59
Dec 22 05:26:17 nd02 kernel:  [<c016ee2f>] generic_readlink+0x2a/0x85
Dec 22 05:26:17 nd02 kernel:  [<c012332f>] current_fs_time+0x59/0x67
Dec 22 05:26:17 nd02 kernel:  [<c0177e61>] update_atime+0x67/0x8c
Dec 22 05:26:17 nd02 kernel:  [<c01674b5>] sys_readlink+0x7e/0x82
Dec 22 05:26:17 nd02 kernel:  [<c0103af3>] sysenter_past_esp+0x54/0x75
Dec 22 05:26:17 nd02 kernel:  at virtual address 00200200
Dec 22 05:26:17 nd02 kernel:  printing eip:
Dec 22 05:26:17 nd02 kernel: c02583a1
Dec 22 05:26:17 nd02 kernel: *pde = 37eb7001
Dec 22 05:26:17 nd02 kernel: Oops: 0002 [#1]
Dec 22 05:26:17 nd02 kernel: SMP
Dec 22 05:26:17 nd02 kernel: Modules linked in: dm_round_robin dm_multipath binfmt_misc dm_mirror dm_mod video thermal proces
sor fan button battery ac uhci_hcd usbcore hw_random shpchp pci_hotplug e1000 qla2300 qla2xxx scsi_transport_fc sd_mod
Dec 22 05:26:17 nd02 kernel: CPU:    1
Dec 22 05:26:17 nd02 kernel: EIP:    0060:[<c02583a1>]    Not tainted VLI
Dec 22 05:26:17 nd02 kernel: EFLAGS: 00010002   (2.6.14.2smp)
Dec 22 05:26:17 nd02 kernel: EIP is at scsi_device_dev_release+0x3d/0x113
Dec 22 05:26:17 nd02 kernel: eax: 00100100   ebx: c2c03194   ecx: 00200200   edx: 00000286
Dec 22 05:26:17 nd02 kernel: esi: c2c03008   edi: c2c03000   ebp: c229d814   esp: d326fe68
Dec 22 05:26:17 nd02 kernel: ds: 007b   es: 007b   ss: 0068
Dec 22 05:26:17 nd02 kernel: Process udev (pid: 4108, threadinfo=d326e000 task=f6e3ca30)
Dec 22 05:26:17 nd02 kernel: Stack: 7f7e7d7c c2c0320c c0371b08 c0371b20 c229d88c c01d935e c2c03194 c2c03224
Dec 22 05:26:17 nd02 kernel:        c01d9362 c03754b8 c2c0320c c01d9c9e c2c0320c c019d854 c03754b8 ef1ac000
Dec 22 05:26:17 nd02 kernel:        c0365040 00000000 c01d938a c2c03224 c01d9362 c019d927 c2c0320c c03754b8
Dec 22 05:26:17 nd02 kernel: Call Trace:
Dec 22 05:26:17 nd02 kernel:  [<c01d935e>] kobject_cleanup+0x77/0x7b
Dec 22 05:26:17 nd02 kernel:  [<c01d9362>] kobject_release+0x0/0xa
Dec 22 05:26:17 nd02 kernel:  [<c01d9c9e>] kref_put+0x32/0x84
Dec 22 05:26:17 nd02 kernel:  [<c019d854>] sysfs_get_target_path+0x73/0x7d
Dec 22 05:26:17 nd02 kernel:  [<c01d938a>] kobject_put+0x1e/0x22
Dec 22 05:26:17 nd02 kernel:  [<c01d9362>] kobject_release+0x0/0xa
Dec 22 05:26:17 nd02 kernel:  [<c019d927>] sysfs_getlink+0xc9/0xfa
Dec 22 05:26:17 nd02 kernel:  [<c019d999>] sysfs_follow_link+0x41/0x59
Dec 22 05:26:17 nd02 kernel:  [<c016ee2f>] generic_readlink+0x2a/0x85
Dec 22 05:26:17 nd02 kernel:  [<c017fc72>] __mark_inode_dirty+0x52/0x1a8
Dec 22 05:26:17 nd02 kernel:  [<c012332f>] current_fs_time+0x59/0x67
Dec 22 05:26:17 nd02 kernel:  [<c0177e61>] update_atime+0x67/0x8c
Dec 22 05:26:17 nd02 kernel:  [<c01674b5>] sys_readlink+0x7e/0x82
Dec 22 05:26:17 nd02 kernel:  [<c0103af3>] sysenter_past_esp+0x54/0x75
Dec 22 05:26:17 nd02 kernel: Code: ff ff 8d bb 6c fe ff ff 8d 75 ec 8b 40 2c e8 cc df 0a 00 83 86 34 01 00 00 01 8d b3 74 fe
ff ff 8b 4e 04 89 c2 8b 83 74 fe ff ff <89> 01 89 48 04 c7 46 04 00 02 20 00 8d b3 7c fe ff ff 8b 83 7c
Dec 22 05:26:19 nd02 multipathd: sdc: path checker registered

What can I do ? 
Thanks for any suggestion!

Best regards!
Luckey