Customer is seeing crashes due to stack overflow. Need to re analyse the
current buffer zone:

src/solaris/hpi/native_threads/include/threads_md.h

/*
 * sysThreadCheckStack() being a function call is unfortunate, as it
 * takes stack space to do, but that is weakly accounted for by the
 * previous stack redzone. In general, where we can't predict stack
 * use by C, thread stack overflow checking doesn't really work.
 *
 * The value of STACK_REDZONE determines how much room must remain on the
 * stack for sysThreadCheckStack() to declare success.
 *
 * At first glance it might appear that sysThreadCheckStack could be
 * implemented in terms of sysThreadCheckStack0. However, that would add
 * another stack frame and distort the check.
 *
 * Note also that these functions rely on local variables and parameters being
 * allocated on the stack, so that taking their address reveals how deep the
 * stack has grown.
 */

#ifdef DEBUG
#define STACK_REDZONE 0x1800 /* should be a multiple of 1K, see JITPass2.c */
#else
#define STACK_REDZONE 0x1000 /* should be at most 4k, see JITPass2.c */
#endif