Created by Vlad Lesin and last modified
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692. By Vlad Lesin

Bug #1351128 fix.

The bug's summary:

1) The value in pins->stack_ends_here is actually incorrect. This value is
calculated when the thread is initialized in my_thread_init(). The problem is
that the value doesn't take into account existing stack usage and just adds the
thread stack size to calculate the beginning of the stack.

2) _lf_pinbox_real_free() is using alloca() in a very unsafe way. alloca()
should only be used by leaf functions, since you cannot predict the amount of
stack space that non-leaf functions will use. As pins->stack_ends_here is
calculated in wrong way and there is no window for the qsort() which is invoked
from _lf_pinbox_real_free() after alloca(), stack overflow can take place.

The solution:

1) Take into accout the current stack offset when stack size is calculated
in my_thread_init();

2) Don't allocate the whole free stack space in _lf_pinbox_real_free(),
take some window for qsort();

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