[Mono-bugs] [Bug 396219] Mono runtime running in emacs shell crashes with ( mono_setup_altstack): assertion failed: (gaddr == tls->stack_ovf_guard_base )

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https://bugzilla.novell.com/show_bug.cgi?id=396219

User gnorton at novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=396219#c2


Geoff Norton <gnorton at novell.com> changed:

           What    |Removed                                         |Added
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                 CC|                                                |gnorton at novell.com




--- Comment #2 from Geoff Norton <gnorton at novell.com>  2008-06-01 09:31:09 MDT ---
I looked into this.  The issue here is the child process in the emacs shell
isn't paged aligned for staddr.  Adding a:

        staddr = (guint8*)((int)staddr & ~(mono_pagesize () - 1));

before setting tls->stack_ovf_guard_base fixes the problem.

Paolo,

  Is this the correct way to fix this (the mmap call in mono_valloc was failing
on the non-aligned address).  Also, the assert there looks dangerous.  If we're
on a machine without mmap mono_valloc falls thru to a malloc call, meaning the
pointers will never match.  Is it possible to have a machine without mmap and
with sigaltstack tho?


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