Kernel panic with NULL pointer dereference in vxfs vx_unlockmap+0xc3/0x239

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Issue

System experiences kernel panics with the following logged message:

Unable to handle kernel NULL pointer dereference at 0000000000000010 RIP: 
 [<ffffffff8855b623>] :vxfs:vx_unlockmap+0xc3/0x239                       
PGD 3be12b2067 PUD 3ad240a067 PMD 0 
Oops: 0000 [1] SMP

Environment

Red Hat Enterprise Linux 6
Using the vxfs module

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