ALTSTACK

Syntax

ALTSTACK [on|off]

Variable

VT_ALTSTACK

Description

Handling segfaults due to a stack overflow requires that the signal handler runs on an alternative stack, otherwise it will just segfault again, causing the process to terminate.

Because installing an alternative signal handler affects application behavior, it is normally not done. If it is known to work, it is enabled only for MPI correctness checking.

For more complete information about compiler optimizations, see our Optimization Notice.
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