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[dm-devel] 2.6 Kernel Oops



Hello,

i try to setup a multipath to a EMC Clariion Device with the following 
infrstructure.
Kernel 2.6.10-rc3 and udm2 Patch.
multipath-tools 0.4.1

I have one qla2310 Adapter "Firmware version 3.03.02 IPX, Driver version 
8.00.00b21-k"
wich is zoned to SPA Port0  and SPB Port0 of the Clariion. So we have 
two path to the LUN.

I setup multipath.conf with the following.

multipath {
               wwid                 3600601601b121200540b8c1caf4ad911                     
               alias                   yellow
               path_grouping_policy    failover
               path_checker             emc_clariion
               path_selector           "round-robin 0"
               getuid_callout  "/sbin/scsi_id -g -u -s %n"
       }
       device {
               vendor                  "DGC     "
               product                 "RAID 5          "
               path_grouping_policy    failover
               getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
               path_checker            emc_clariion
       }

When i start the multipathd i get the following table

yellow: 0 20971520 multipath 0 0 2 1 round-robin 0 1 1 8:64 1000 
round-robin 0 1 1 8:80 1000

multipath -v2 -l reports

yellow (3600601601b121200540b8c1caf4ad911)
[size=10 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [enabled][first]
 \_ 2:0:1:0 sde  8:64    [ready ][active]
\_ round-robin 0 [enabled]
 \_ 2:0:2:0 sdf  8:80    [ready ][active]

I can work with the device     dd if=/dev/yellow of=/dev/null count=1000 

When i disable one port on the switch to the Clarion, or unplug the cable from 
the SP (Clariion) the dd command goes to D+ state (ps ax)
and I get messages like this.

Dec 23 14:35:31 lxssantm1 kernel: SCSI error : <2 0 1 0> return code = 
0x20000
Dec 23 14:35:31 lxssantm1 kernel: end_request: I/O error, dev sde, sector 0
Dec 23 14:35:31 lxssantm1 kernel: end_request: I/O error, dev sde, sector 8
Dec 23 14:35:31 lxssantm1 multipathd: devmap event on yellow
Dec 23 14:35:45 lxssantm1 multipathd: 8:64 : emc_clariion_checker: query 
command indicates error
Dec 23 14:35:45 lxssantm1 kernel: SCSI error : <2 0 1 0> return code = 
0x10000
Dec 23 14:35:45 lxssantm1 last message repeated 6 times
Dec 23 14:35:45 lxssantm1 kernel: device-mapper: multipath_message 
received. argc: 2
Dec 23 14:35:45 lxssantm1 kernel: Unable to handle kernel paging request 
at virtual address f8d44080
Dec 23 14:35:45 lxssantm1 kernel:  printing eip:
Dec 23 14:35:45 lxssantm1 kernel: f8f47e43
Dec 23 14:35:45 lxssantm1 kernel: *pde = 1fc86067
Dec 23 14:35:45 lxssantm1 kernel: Oops: 0000 [#1]
Dec 23 14:35:45 lxssantm1 kernel: SMP
Dec 23 14:35:45 lxssantm1 kernel: Modules linked in: dm_round_robin 
dm_multipath joydev st sr_mod ide_cd cdrom nvram edd speedstep_lib fre
q_table processor ipv6 sg intel_agp agpgart i2c_piix4 i2c_core evdev 
tulip dm_mod reiserfs qla2300 qla2xxx scsi_transport_fc gdth aic7xxx
sd_mod scsi_mod
Dec 23 14:35:45 lxssantm1 kernel: CPU:    0
Dec 23 14:35:45 lxssantm1 kernel: EIP:    0060:[<f8f47e43>]    Not 
tainted VLI
Dec 23 14:35:45 lxssantm1 kernel: EFLAGS: 00010247   (2.6.10-rc3)
Dec 23 14:35:45 lxssantm1 kernel: EIP is at trigger_event+0x3/0x10 
[dm_multipath]
Dec 23 14:35:45 lxssantm1 kernel: eax: f8d44080   ebx: f31787ec   ecx: 
dfe30000   edx: 00000216
Dec 23 14:35:45 lxssantm1 kernel: esi: dfe30000   edi: f31787f0   ebp: 
f3178760   esp: dfe33f60
Dec 23 14:35:45 lxssantm1 multipathd: event checker startup : yellow
Dec 23 14:35:45 lxssantm1 kernel: ds: 007b   es: 007b   ss: 0068
Dec 23 14:35:45 lxssantm1 kernel: Process events/0 (pid: 6, 
threadinfo=dfe32000 task=dffefa60)
Dec 23 14:35:45 lxssantm1 kernel: Stack: c0128a38 dfe30020 f8f47e40 
00000216 dfe32000 dfe3000c ffffffff ffffffff
Dec 23 14:35:45 lxssantm1 kernel:        00000001 00000000 c0116330 
00010000 00000000 c18109c0 c1810060 00000000
Dec 23 14:35:45 lxssantm1 kernel:        00000000 dffefa60 c0116330 
00100100 00200200 dffefbc4 00000000 00000000
Dec 23 14:35:45 lxssantm1 kernel: Call Trace:
Dec 23 14:35:45 lxssantm1 kernel:  [<c0128a38>] worker_thread+0x1a8/0x230
Dec 23 14:35:45 lxssantm1 kernel:  [<f8f47e40>] trigger_event+0x0/0x10 
[dm_multipath]
Dec 23 14:35:45 lxssantm1 kernel:  [<c0116330>] 
default_wake_function+0x0/0x10
Dec 23 14:35:45 lxssantm1 kernel:  [<c0116330>] 
default_wake_function+0x0/0x10
Dec 23 14:35:45 lxssantm1 kernel:  [<c0128890>] worker_thread+0x0/0x230
Dec 23 14:35:45 lxssantm1 kernel:  [<c012c666>] kthread+0x86/0xb0
Dec 23 14:35:45 lxssantm1 kernel:  [<c012c5e0>] kthread+0x0/0xb0
Dec 23 14:35:45 lxssantm1 kernel:  [<c01019b5>] 
kernel_thread_helper+0x5/0x10
Dec 23 14:35:45 lxssantm1 kernel: Code: 89 f0 e8 61 fc ff ff 8b 7e 38 85 
ff 75 96 8b 46 28 85 c0 74 96 8b 5e 2c 85 db 75 8f c7 44 24 04 01
00 00 00 eb 85 89 f6 8b 40 08 <8b> 00 e9 76 e8 d4 ff 8d b6 00 00 00 00 
56 85 d2 53 89 ce 89 c3
Dec 23 14:35:56 lxssantm1 multipathd: 8:64 : emc_clariion_checker: Path 
healthy


Enable the Switch Port or plugging the cable has no effect. The 
device /dev/yellow remains dead.

No failover !!!!


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