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ARM64: check stack pointer in get_wchan
get_wchan() is lockless. Task may wakeup at any time and change its own stack, thus each next stack frame may be overwritten and filled with random stuff. Signed-off-by: NKonstantin Khlebnikov <k.khlebnikov@samsung.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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