[Bug nptl/6976] New: allocated thread stack size can be less than requested stack size

[Bug nptl/6976] New: allocated thread stack size can be less than requested stack size

[mtk dot manpages at gmail dot com]

For pthread_attr_setstacksize(), POSIX.1-2001 says:

"The stacksize attribute shall define the minimum stack size (in bytes)
allocated for the created threads stack."

However, under NPTL, the allocated stack (as reported by pthread_getattr_np())
can be up to [STACK_MIN - 1] (15 on x86-32) bytes less than was requested.  

The problem line looks to be the following line in nptl/allocatestak.c:

      size &= ~__static_tls_align_m1;

which should probably be something like:

      size = (size + __static_tls_align_m1 + 1) & ~__static_tls_align_m1;

-- 
           Summary: allocated thread stack size can be less than requested
                    stack size
           Product: glibc
           Version: 2.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: mtk dot manpages at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6976

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[Bug nptl/6976] allocated thread stack size can be less than requested stack size

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-10-24 02:01 -------
Created an attachment (id=3021)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=3021&action=view)
test program

The attached program can be used to test.  Here's some examples:

$ uname -i
i386
$ ./a.out 0x400f
Attributes of created thread:
    Stack address	= 0xb7fe6000 (EOS = 0xb7fea000)
    Stack size		= 0x4000 (16384) bytes
$ ./a.out 0x5161f
Attributes of created thread:
    Stack address	= 0xb7d7c000 (EOS = 0xb7dcd610)
    Stack size		= 0x51610 (333328) bytes


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http://sourceware.org/bugzilla/show_bug.cgi?id=6976

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[Bug nptl/6976] allocated thread stack size can be less than requested stack size

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=6976

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |siddhesh at redhat dot com
         Resolution|                            |DUPLICATE

--- Comment #2 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-05-23 17:08:07 UTC ---
We're looking to fix this with bug 11787. Closing this as duplicate.

*** This bug has been marked as a duplicate of bug 11787 ***

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[Bug nptl/6976] allocated thread stack size can be less than requested stack size

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=6976

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

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