Re: [PATCH][BZ #18508] S390: Fix "backtrace() returns infinitely deep stack frames with makecontext()".

[Stefan Liebler <stli at linux dot vnet dot ibm dot com>]

ping

On 06/19/2015 12:44 PM, Stefan Liebler wrote:
> PING
>
> On 06/15/2015 10:47 AM, Stefan Liebler wrote:
> > On 06/12/2015 05:40 PM, Andreas Schwab wrote:
> > > Stefan Liebler <stli@linux.vnet.ibm.com> writes:
> > >
> > > > Is there a way to load the correct libgcc_s.so on all architectures?
> > >
> > > #include <gnu/lib-names.h>
> > > dlopen(LIBGCC_S_SO, ...)
> > >
> > > Andreas.
> > Thanks.
> > Here is the patch with the enhanced tst-makecontext testcase.
> > It calls _Unwind_Backtrace within cf() function, which is called in a
> > makecontext context and check if the callback function is not called
> > infinitely times.
> >
> > Tested on s390/s390x before and after this patch.
> > Before: Test fails; After: Test succeeds.
> >
> > Ok to commit?
> >
> > Bye Stefan
> >
> > ---
> > 2015-06-15  Stefan Liebler  <stli@linux.vnet.ibm.com>
> >
> >      [BZ #18508]
> >      * stdlib/Makefile ($(objpfx)tst-makecontext3):
> >      Depend on $(libdl).
> >      * stdlib/tst-makecontext.c (cf): Test if _Unwind_Backtrace
> >      is not called infinitely times.
> >      (backtrace_helper): New function.
> >      (trace_arg): New struct.
> >      (st1): Enlarge stack size.
> >      * sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:
> >      (__makecontext_ret): Omit cfi_startproc and cfi_endproc.
> >      * sysdeps/unix/sysv/linux/s390/s390-64/__makecontext_ret.S:
> >      Likewise.