Re: OOPS in perf_mmap_close()

From: Peter Zijlstra
Date: Thu May 23 2013 - 11:26:26 EST

On Thu, May 23, 2013 at 10:10:36AM -0400, Vince Weaver wrote:
> 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?

Sounds weird to me, I'll see if I can reproduce/understand.
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