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diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
--- a/sys/amd64/linux/linux_sysvec.c
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -465,16 +465,29 @@
LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
catcher, sig, mask, code);
- /* Save user context. */
bzero(&sf, sizeof(sf));
- bsd_to_linux_sigset(mask, &sf.sf_uc.uc_sigmask);
- sf.sf_uc.uc_mcontext.sc_mask = sf.sf_uc.uc_sigmask;
-
sf.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
+ /* Allocate space for the signal handler context. */
+ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
+ } else
+ sp = (caddr_t)regs->tf_rsp - 128;
+
+ mtx_unlock(&psp->ps_mtx);
+ PROC_UNLOCK(p);
+
+ /* Make room, keeping the stack aligned. */
+ sp -= sizeof(struct l_rt_sigframe);
+ sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
+
+ /* Save user context. */
+ bsd_to_linux_sigset(mask, &sf.sf_uc.uc_sigmask);
+ sf.sf_uc.uc_mcontext.sc_mask = sf.sf_uc.uc_sigmask;
sf.sf_uc.uc_mcontext.sc_rdi = regs->tf_rdi;
sf.sf_uc.uc_mcontext.sc_rsi = regs->tf_rsi;
sf.sf_uc.uc_mcontext.sc_rdx = regs->tf_rdx;
@@ -498,19 +511,6 @@
sf.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
sf.sf_uc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
- /* Allocate space for the signal handler context. */
- if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
- SIGISMEMBER(psp->ps_sigonstack, sig)) {
- sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
- } else
- sp = (caddr_t)regs->tf_rsp - 128;
- sp -= sizeof(struct l_rt_sigframe);
- /* Align to 16 bytes. */
- sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
-
- mtx_unlock(&psp->ps_mtx);
- PROC_UNLOCK(p);
-
get_fpcontext(td, &mc, NULL, NULL);
KASSERT(mc.mc_fpformat != _MC_FPFMT_NODEV, ("fpu not present"));
svfp = (struct savefpu *)mc.mc_fpstate;

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