BUG 800992 - pagebuf_init call to kmem_cache_create BUG()

[pv@xxxxxxxxxxxxx (dxm@xxxxxxxxxxxx)]

View Incident: 
http://co-op.engr.sgi.com/BugWorks/code/bwxquery.cgi?search=Search&wlong=1&view_type=Bug&wi=800992

Submitter : dxm                       Submitter Domain : engr               
Assigned Engineer : dxm               Assigned Domain : engr                
Assigned Group : xfs-linux            Category : software                   
Customer Reported : T                 Priority : 4                          
Project : xfs-linux                   Status : open                         
Description :
On my test box, I'd been playing with xfs, then
umounted, rmmoded and insmoded the modules. When
pagebuf was insmoded, this kernel BUG() was tripped.

I'll see if I can get some more info on this one.

kmem_cache_destroy: Can't free all objects c116d764
kernel BUG at slab.c:806!

Entering kdb (0xc215e000) Panic: invalid operand
due to panic @ 0xc0125dce
eax = 0x0000001a ebx = 0xc116d7c0 ecx = 0xc02a2ccc edx = 0x00000000 
esi = 0xc116d7b7 edi = 0xc4813fa2 esp = 0xc215fec0 eip = 0xc0125dce 
ebp = 0xc215ff00  ss = 0x00000018  cs = 0x00000010 eflags = 0x00010246 
 ds = 0x00000018  es = 0x00000018 origeax = 0xffffffff &regs = 0xc215fe8c
kdb> bt
    EBP       EIP         Function(args)
0xc215ff00 0xc0125dce kmem_cache_create+0x35a (0xc4813f97, 0xa0, 0x20, 0x2000, 
0x0)
                               kernel .text 0xc0100000 0xc0125a74 0xc0125e18
0xc215ff20 0xc4810657 [pagebuf]pagebuf_init+0x77 (0xc4813fc0)
                               pagebuf .text 0xc480e060 0xc48105e0 0xc4810670
0xc215ff30 0xc48106d3 [pagebuf]init_module+0x13 (0xc215e000, 0x80606d8)
                               pagebuf .text 0xc480e060 0xc48106c0 0xc4810708
0xc215ffbc 0xc0117459 sys_init_module+0x429 (0x805a4d8, 0x807e4d0, 0x80857f0, 
0x80606d8, 0xc480e000)
                               kernel .text 0xc0100000 0xc0117030 0xc01174d4
kdb: Bad kernel address 0xc480dffb
           0xc0108f08 system_call+0x34
                               kernel .text 0xc0100000 0xc0108ed4 0xc0108f0c
kdb>