m4 FTBFS

[Julien Cristau]

On Mon, Dec  2, 2013 at 11:31:58 +0100, Santiago Vila wrote:

> Hello.
> 
> m4 FTBFS on sparc. I need help to diagnose this.
> 
> https://buildd.debian.org/status/fetch.php?pkg=m4&arch=sparc&ver=1.4.17-2&stamp=1385908483
> 
Looks like an issue between the kernel and libsigsegv.  As far as I can
tell from looking a this on smetana, sigsegv_handler gets called with
this siginfo_t structure:

(gdb) p *sip
$1 = {si_signo = 11, si_errno = 0, si_code = 1, _sifields = {_pad = {
      0 <repeats 29 times>}, _kill = {si_pid = 0, si_uid = 0}, _timer = {
      si_tid = 0, si_overrun = 0, si_sigval = {sival_int = 0, 
        sival_ptr = 0x0}}, _rt = {si_pid = 0, si_uid = 0, si_sigval = {
        sival_int = 0, sival_ptr = 0x0}}, _sigchld = {si_pid = 0, si_uid = 0, 
      si_status = 0, si_utime = 0, si_stime = 0}, _sigfault = {si_addr = 0x0, 
      si_trapno = 0}, _sigpoll = {si_band = 0, si_fd = 0}, _sigsys = {
      _call_addr = 0x0, _syscall = 0, _arch = 0}}}

I'm not sure the NULL value for si_addr is expected.  In any case the
"is this near the top of the stack" check fails, and the overflow
handler is never called.

Cheers,
Julien
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