Checking patch sysdeps/mach/hurd/x86_64/sigreturn.c...
error: while searching for:
   unlock SS off sigstack.  */
void
__sigreturn2 (struct hurd_sigstate *ss, uintptr_t *usp,
              struct sigcontext *scp)
{
  mach_port_t reply_port;
  _hurd_sigstate_unlock (ss);

error: patch failed: sysdeps/mach/hurd/x86_64/sigreturn.c:24
error: while searching for:
  if (__glibc_likely (MACH_PORT_VALID (reply_port)))
    (void) __mach_port_mod_refs (__mach_task_self (), reply_port,
                                 MACH_PORT_RIGHT_RECEIVE, -1);
  THREAD_SETMEM (THREAD_SELF, reply_port, scp->sc_reply_port);

  asm volatile (
                /* Point the stack to the register dump.  */

error: patch failed: sysdeps/mach/hurd/x86_64/sigreturn.c:44
error: while searching for:
{
  struct hurd_sigstate *ss;
  struct hurd_userlink *link = (void *) &scp[1];

  if (__glibc_unlikely (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK)))
    return __hurd_fail (EINVAL);

error: patch failed: sysdeps/mach/hurd/x86_64/sigreturn.c:77
error: while searching for:
       in the format the i387 `frstor' instruction uses to restore it.  */
    asm volatile ("frstor %0" : : "m" (scp->sc_fpsave));

  {
    /* There are convenient instructions to pop state off the stack, so we
       copy the registers onto the user's stack, switch there, pop and
       return.  */

    uintptr_t *usp = (uintptr_t *) (scp->sc_ursp - 128);

    *--usp = scp->sc_rip;
    *--usp = scp->sc_rfl;
    *--usp = scp->sc_rax;
    *--usp = scp->sc_rcx;
    *--usp = scp->sc_rdx;
    *--usp = scp->sc_rbx;
    *--usp = scp->sc_rbp;
    *--usp = scp->sc_rsi;
    *--usp = scp->sc_rdi;
    *--usp = scp->sc_r15;
    *--usp = scp->sc_r14;
    *--usp = scp->sc_r13;
    *--usp = scp->sc_r12;
    *--usp = scp->sc_r11;
    *--usp = scp->sc_r10;
    *--usp = scp->sc_r9;
    *--usp = scp->sc_r8;

    /* Switch to the user's stack that we have just prepared, and call
       __sigreturn2.  Clobber "memory" to make sure GCC flushes the stack
       setup to actual memory.  We align the stack as per the ABI, but pass
       the original usp to __sigreturn2 as an argument.  */
    asm volatile ("movq %1, %%rsp\n"
                  "andq $-16, %%rsp\n"
                  "call __sigreturn2" :
                  : "D" (ss), "S" (usp), "d" (scp)
                  : "memory");
    __builtin_unreachable ();
  }
}

weak_alias (__sigreturn, sigreturn)

error: patch failed: sysdeps/mach/hurd/x86_64/sigreturn.c:118
Applying patch sysdeps/mach/hurd/x86_64/sigreturn.c with 4 rejects...
Rejected hunk #1.
Rejected hunk #2.
Rejected hunk #3.
Rejected hunk #4.