[Bug middle-end/64465] New: [5 Regression] internal compiler error: verify_flow_info failed

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64465

            Bug ID: 64465
           Summary: [5 Regression] internal compiler error:
                    verify_flow_info failed
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com

On Linux/x86-64, r219127 gave:

[hjl@gnu-tools-1 tmp]$ cat foo.c
typedef void (*__sighandler_t) (int);
struct sigaction
  {
 __sighandler_t sa_handler;
  };
extern int sigaction (const struct sigaction *__restrict __act);
extern int __open_alias (const char *__path, int __oflag, ...) __asm__ (""
"open")
                              ;
extern __inline __attribute__ ((__always_inline__)) __attribute__
((__artificial__)) int
open (const char *__path, int __oflag, ...)
{
  if (__builtin_constant_p (__oflag))
    return __open_alias (__path, __oflag, __builtin_va_arg_pack ());
  return __open_alias (__path, __oflag, __builtin_va_arg_pack ());
}
extern int close(int fd);
static void
set_fortify_handler (void (*handler) (int sig))
{
  struct sigaction sa;
  sigaction (&sa);
  int fd = open ("/dev/null", 3);
  if (fd == -1)
    close (1);
}
extern void handler (int sig);
void
do_test (void)
{
  set_fortify_handler (handler);
}
[hjl@gnu-tools-1 tmp]$
/export/build/gnu/gcc-x32/release/usr/gcc-5.0.0-x32/bin/gcc -O2 foo.c   -O2
-Wall -fexceptions  
foo.c: In function âset_fortify_handlerâ:
foo.c:31:1: error: BB 5 last statement has incorrectly set lp
 }
 ^
foo.c:31:1: internal compiler error: verify_flow_info failed
0x71e49b verify_flow_info()
    /export/gnu/import/git/gcc/gcc/cfghooks.c:271
0xb33b39 cleanup_tree_cfg_noloop
    /export/gnu/import/git/gcc/gcc/tree-cfgcleanup.c:753
0xb33b39 cleanup_tree_cfg()
    /export/gnu/import/git/gcc/gcc/tree-cfgcleanup.c:802
0xa32b14 execute_function_todo
    /export/gnu/import/git/gcc/gcc/passes.c:1893
0xa33603 execute_todo
    /export/gnu/import/git/gcc/gcc/passes.c:1997
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