D44893.diff
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	diff --git a/lib/libthr/thread/thr_sig.c b/lib/libthr/thread/thr_sig.c
	--- a/lib/libthr/thread/thr_sig.c
	+++ b/lib/libthr/thread/thr_sig.c
	@@ -247,7 +247,6 @@
	handle_signal(struct sigaction actp, int sig, siginfo_t info, ucontext_t *ucp)
	{
	struct pthread *curthread = _get_curthread();
	- ucontext_t uc2;
	__siginfohandler_t *sigfunc;
	int cancel_point;
	int cancel_async;
	@@ -307,13 +306,11 @@
	curthread->cancel_point = cancel_point;
	curthread->cancel_enable = cancel_enable;

	- memcpy(&uc2, ucp, sizeof(uc2));
	- SIGDELSET(uc2.uc_sigmask, SIGCANCEL);
	+ SIGDELSET(ucp->uc_sigmask, SIGCANCEL);

	/* reschedule cancellation */
	- check_cancel(curthread, &uc2);
	+ check_cancel(curthread, ucp);
	errno = err;
	- syscall(SYS_sigreturn, &uc2);
	}

	void
	@@ -400,6 +397,7 @@
	/* remove signal */
	curthread->deferred_siginfo.si_signo = 0;
	handle_signal(&act, info.si_signo, &info, uc);
	+ syscall(SYS_sigreturn, uc);
	}

	static void