An mm bug in today's 2.6.32 git tree

[AmÃrico Wang]

Hi, mm experts,

I met the following bug in the kernel from today's git tree, accidentally.
I don't know how to reproduce it, just saw it twice when doing different
work. Machine is x86_64.

Is this bug known?

Please feel free to let me know if you need more info.

Thanks!

----------------
swap_free: Bad swap offset entry 09003c00
BUG: Bad page map in process vim  pte:1200780000 pmd:22f221067
addr:000000319ce0f000 vm_flags:08000075 anon_vma:(null)
mapping:ffff88022efa8848 index:f
vma->vm_ops->fault: filemap_fault+0x0/0x593
vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x63
Pid: 659, comm: vim Tainted: G    B      2.6.32 #55
Call Trace:
 [<ffffffff81116d32>] ? print_bad_pte+0x29b/0x2c2
 [<ffffffff81118550>] ? unmap_vmas+0x8bc/0xbd5
 [<ffffffff8111eaf9>] ? exit_mmap+0x13b/0x232
 [<ffffffff810593de>] ? mmput+0x57/0x123
 [<ffffffff8105f8ce>] ? exit_mm+0x1af/0x1c1
 [<ffffffff81089da6>] ? up_read+0x10/0x19
 [<ffffffff81061607>] ? do_exit+0x2f2/0xa61
 [<ffffffff81089da6>] ? up_read+0x10/0x19
 [<ffffffff81061e75>] ? sys_exit_group+0x0/0x24
 [<ffffffff81061e8e>] ? sys_exit_group+0x19/0x24
 [<ffffffff810039ab>] ? system_call_fastpath+0x16/0x1b
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