[Bug libc/18635] New: .stdlib/tst-makecontext fails on i686

[Bug libc/18635] New: .stdlib/tst-makecontext fails on i686

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

            Bug ID: 18635
           Summary: .stdlib/tst-makecontext fails on i686
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

On i686, I got

Program received signal SIGSEGV, Segmentation fault.
uw_frame_state_for (context=context@entry=0x8050120 <st1+15968>, 
    fs=fs@entry=0x80501a0 <st1+16096>)
    at /export/gnu/import/git/sources/gcc/libgcc/unwind-dw2.c:1249
1249          return MD_FALLBACK_FRAME_STATE_FOR (context, fs);
(gdb) bt
#0  uw_frame_state_for (context=context@entry=0x8050120 <st1+15968>, 
    fs=fs@entry=0x80501a0 <st1+16096>)
    at /export/gnu/import/git/sources/gcc/libgcc/unwind-dw2.c:1249
#1  0xf7e102a8 in _Unwind_Backtrace (trace=0x8049420 <backtrace_helper>, 
    trace_argument=0x8050298 <st1+16344>)
    at /export/gnu/import/git/sources/gcc/libgcc/unwind.inc:290
#2  0x080494a6 in cf (i=-78) at tst-makecontext.c:72
#3  0xf7e55d1b in makecontext ()
    at ../sysdeps/unix/sysv/linux/i386/makecontext.S:87
#4  0xffffffb2 in ?? ()
#5  0x00000000 in ?? ()
(gdb) p *context
$4 = {reg = {0x0, 0x0, 0x0, 0x80502a8 <st1+16360>, 0x0, 0x8050278 <st1+16312>, 
    0x8050270 <st1+16304>, 0x8050274 <st1+16308>, 0x80502b0 <st1+16368>, 0x0, 
    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, cfa = 0x80502b4 <st1+16372>, 
  ra = 0xffffffb2, lsda = 0x0, bases = {tbase = 0x0, dbase = 0xf7fcc000, 
    func = 0xf7e55cd0 <makecontext>}, flags = 1073741824, version = 0, 
  args_size = 0, by_value = '\000' <repeats 17 times>}
(gdb) 

context->ra (0xffffffb2) is bogus.

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[Bug libc/18635] .stdlib/tst-makecontext fails on i686

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Somehow the unwind info on i686 was corrupted.

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[Bug libc/18635] stdlib/tst-makecontext fails on i686

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|.stdlib/tst-makecontext     |stdlib/tst-makecontext
                   |fails on i686               |fails on i686

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[Bug libc/18635] stdlib/tst-makecontext fails on i686

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
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       via  f6267fd880a3c93a05e731c4ae6d661bc91aaf25 (commit)
       via  ed95ec72fbe2ca35063dc80e6fd2931348439fc4 (commit)
      from  c01ae97eb8986600488332f4db98f4b6d6ebedbc (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f6267fd880a3c93a05e731c4ae6d661bc91aaf25

commit f6267fd880a3c93a05e731c4ae6d661bc91aaf25
Author: Stefan Liebler <stli@linux.vnet.ibm.com>
Date:   Wed Jul 15 09:33:15 2015 +0200

    i686: Mark stdlib/tst-makecontext as XFAIL.

    The testcase stdlib/tst-makecontext fails on i686 because
    _Unwind_Backtrace from libgcc produces a segmentation fault if it was
    called within a context created by makecontext. See Bug 18635.

    ChangeLog:

        * sysdeps/i386/i686/Makefile (test-xfail-tst-makecontext):
        New variable.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ed95ec72fbe2ca35063dc80e6fd2931348439fc4

commit ed95ec72fbe2ca35063dc80e6fd2931348439fc4
Author: Stefan Liebler <stli@linux.vnet.ibm.com>
Date:   Wed Jul 15 09:33:14 2015 +0200

    S390: Regenerate ULPs

    I've regenerated the ulps for s390 from scratch.

    ChangeLog:

        * sysdeps/s390/fpu/libm-test-ulps: Regenerated.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                       |    9 ++++++
 sysdeps/i386/i686/Makefile      |    6 ++++
 sysdeps/s390/fpu/libm-test-ulps |   56 +++++++++++++++++++-------------------
 3 files changed, 43 insertions(+), 28 deletions(-)

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[Bug libc/18635] stdlib/tst-makecontext fails on ix86

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|stdlib/tst-makecontext      |stdlib/tst-makecontext
                   |fails on i686               |fails on ix86

--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
It also fails on i586.

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[Bug libc/18635] stdlib/tst-makecontext fails on ix86

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

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commit bbab82c25da9b504c0804119840de7aeab0eeeba
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Aug 4 12:35:50 2015 +0200

    Properly terminate FDE in makecontext for ix86 (bug 18635)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                  |    7 +++++++
 NEWS                                       |    4 ++--
 sysdeps/i386/i686/Makefile                 |    6 ------
 sysdeps/unix/sysv/linux/i386/makecontext.S |    5 ++++-
 4 files changed, 13 insertions(+), 9 deletions(-)

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[Bug libc/18635] stdlib/tst-makecontext fails on ix86

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.22

--- Comment #5 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixed for 2.22.

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[Bug libc/18635] stdlib/tst-makecontext fails on ix86

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

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commit bb1d31d06e400a42da4435e8649bb7a1451ef682
Author: Andreas Schwab <schwab@linux-m68k.org>
Date:   Wed Aug 5 23:20:49 2015 +0200

    Properly terminate FDE in makecontext for m68k (bug 18635)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                         |    6 ++++++
 sysdeps/unix/sysv/linux/m68k/m680x0/makecontext.S |    5 ++++-
 2 files changed, 10 insertions(+), 1 deletions(-)

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[Bug libc/18635] stdlib/tst-makecontext fails on ix86

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18635

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commit b4b522f6108e2116fb806e4f29b25542062dd84b
Author: Andreas Schwab <schwab@suse.de>
Date:   Thu Aug 20 15:25:18 2015 +0200

    Terminate FDE before return trampoline in makecontext for powerpc (bug
18635)

    This fixes tst-makecontext for PowerPC.

        [BZ #18635]
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S
        (__makecontext): Terminate FDE before return label.
        (__novec_makecontext): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                          |    7 +++++++
 .../sysv/linux/powerpc/powerpc32/makecontext.S     |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

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