Re: OOPS in perf_mmap_close()

[Vince Weaver]

I can confirm your patch avoids the oops on my machine.

It does lead to interesting behavior if I run the sample program
multiple times (with added printfs):

vince@core2:~$ ./perf_mmap_close_bug 
mmap1=0x7f06a6e90000
mmap2=0x7f06a6e7f000
vince@core2:~$ ./perf_mmap_close_bug 
mmap1=0x7f878a138000
mmap2=0x7f878a127000
vince@core2:~$ ./perf_mmap_close_bug 
mmap1=0xffffffffffffffff
Error opening fd2 Invalid argument

and then it never successfully completes again.  Is this unexpected 
behavior?  Or just a normal mmap/perf interaction that I don't understand?

Vince
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