[Bug libc/11787] Program with large TLS segment fails aio_write

[carlos_odonell at mentor dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=11787

--- Comment #17 from Carlos O'Donell <carlos_odonell at mentor dot com> 2012-03-24 20:12:51 UTC ---
(In reply to comment #14)
> the increased size should only matter if the new size pushes past a page
> boundary right ?  and even then, it'd only be 4KiB per thread ?
> 
> i don't see that being a problem.

No the new size is going to be the full size of the PT_TLS segment e.g. static
.tdata/.tbss which is normally allocated out of the thread stack.

Could you do a canvas of a gentoo install to see how big those TLS segments are
in executables?

e.g.
Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
...
  TLS            0x185194 0x00186194 0x00186194 0x00008 0x00040 R   0x4
...

The reservations grow by MemSiz.

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