[Bug bootstrap/79069] New: [7 Regression] Bootstrap failure on s390x-linux while building libgo

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79069

            Bug ID: 79069
           Summary: [7 Regression] Bootstrap failure on s390x-linux while
                    building libgo
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

The s390x-linux bootstrap fails for me (profiledbootstrap as well as bootstrap)
while building 31-bit libgo:
/builddir/build/BUILD/gcc-7.0.0-20170111/obj-s390x-redhat-linux/./gcc/gccgo
-B/builddir/build/BUILD/gcc-7.0.0-20170111/obj-s390x-redhat-linux/./gcc/
-B/usr/s390x-redhat-linux/bin/ -B/usr/s390x-redhat-linux/lib/ -isystem
/usr/s390x-redhat-linux/include -isystem /usr/s390x-redhat-linux/sys-include
-O2 -g -m31 -I . -c -fgo-pkgpath=runtime -fgo-c-header=runtime.inc.tmp
-fgo-compiling-runtime ../../../../libgo/go/runtime/alg.go
../../../../libgo/go/runtime/cgo_gccgo.go ../../../../libgo/go/runtime/chan.go
../../../../libgo/go/runtime/compiler.go
../../../../libgo/go/runtime/cpuprof.go
../../../../libgo/go/runtime/cputicks.go ../../../../libgo/go/runtime/debug.go
../../../../libgo/go/runtime/env_posix.go ../../../../libgo/go/runtime/error.go
../../../../libgo/go/runtime/extern.go ../../../../libgo/go/runtime/ffi.go
../../../../libgo/go/runtime/hash32.go ../../../../libgo/go/runtime/hashmap.go
../../../../libgo/go/runtime/hashmap_fast.go
../../../../libgo/go/runtime/iface.go ../../../../libgo/go/runtime/lfstack.go
../../../../libgo/go/runtime/lfstack_32bit.go
../../../../libgo/go/runtime/lock_futex.go
../../../../libgo/go/runtime/mcache.go ../../../../libgo/go/runtime/mprof.go
../../../../libgo/go/runtime/msan0.go ../../../../libgo/go/runtime/mstats.go
../../../../libgo/go/runtime/netpoll.go
../../../../libgo/go/runtime/netpoll_epoll.go
../../../../libgo/go/runtime/os_gccgo.go
../../../../libgo/go/runtime/os_linux.go ../../../../libgo/go/runtime/panic.go
../../../../libgo/go/runtime/print.go ../../../../libgo/go/runtime/proc.go
../../../../libgo/go/runtime/race0.go ../../../../libgo/go/runtime/rdebug.go
../../../../libgo/go/runtime/rune.go ../../../../libgo/go/runtime/runtime.go
../../../../libgo/go/runtime/runtime1.go
../../../../libgo/go/runtime/runtime2.go ../../../../libgo/go/runtime/select.go
../../../../libgo/go/runtime/sema.go
../../../../libgo/go/runtime/signal1_unix.go
../../../../libgo/go/runtime/signal2_unix.go
../../../../libgo/go/runtime/signal_gccgo.go
../../../../libgo/go/runtime/signal_sighandler.go
../../../../libgo/go/runtime/signal_sigtramp.go
../../../../libgo/go/runtime/signal_unix.go
../../../../libgo/go/runtime/sigpanic_unix.go
../../../../libgo/go/runtime/sigqueue.go ../../../../libgo/go/runtime/slice.go
../../../../libgo/go/runtime/string.go ../../../../libgo/go/runtime/stubs.go
../../../../libgo/go/runtime/stubs2.go ../../../../libgo/go/runtime/symtab.go
../../../../libgo/go/runtime/time.go ../../../../libgo/go/runtime/trace.go
../../../../libgo/go/runtime/traceback_gccgo.go
../../../../libgo/go/runtime/type.go ../../../../libgo/go/runtime/typekind.go
../../../../libgo/go/runtime/unaligned1.go
../../../../libgo/go/runtime/write_err.go runtime_sysinfo.go sigtab.go  -fPIC
-o .libs/runtime.o

fails with:
../../../../libgo/go/runtime/trace.go: In function
'runtime.dump.pN23_runtime.traceStackTable':
../../../../libgo/go/runtime/trace.go:731:1: internal compiler error: in
fixup_reorder_chain, at cfgrtl.c:3840
 func (tab *traceStackTable) dump() {
 ^

0x802f64e9 fixup_reorder_chain
        ../../gcc/cfgrtl.c:3840
0x802f64e9 cfg_layout_finalize()
        ../../gcc/cfgrtl.c:4306
0x80aebf23 execute
        ../../gcc/bb-reorder.c:2576