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[Bug nptl/6976] New: allocated thread stack size can be less than requested stack size
- From: "mtk dot manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 24 Oct 2008 01:59:44 -0000
- Subject: [Bug nptl/6976] New: allocated thread stack size can be less than requested stack size
- Reply-to: sourceware-bugzilla at sourceware dot org
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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