[Bug go/59432] New: [4.9 regression] sync/atomic FAILs on Solaris/x86

[Bug go/59432] New: [4.9 regression] sync/atomic FAILs on Solaris/x86

[ro at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

            Bug ID: 59432
           Summary: [4.9 regression] sync/atomic FAILs on Solaris/x86
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: ro at gcc dot gnu.org
              Host: i386-pc-solaris2.*
            Target: i386-pc-solaris2.*
             Build: i386-pc-solaris2.*

The sync/atomic test recently started to FAIL on Solaris/x86:

Abort


goroutine 1 [chan receive]:
main.main
       
/var/gcc/gcc-4.9.0-20131206/10-gcc/i386-pc-solaris2.10/libgo/gotest22695
/test/_testmain.go:67
FAIL: sync/atomic

The Abort happens in the TestNilDeref test:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 3 (LWP 3)]
0xfeb32ddc in sync_atomic.CompareAndSwapInt32 (val=val@entry=0x0, 
    old=old@entry=0, new=new@entry=0)
    at /vol/gcc/src/hg/trunk/solaris/libgo/go/sync/atomic/atomic.c:78
78        return __sync_bool_compare_and_swap (val, old, new);
(gdb) where
#0  0xfeb32ddc in sync_atomic.CompareAndSwapInt32 (val=val@entry=0x0, 
    old=old@entry=0, new=new@entry=0)
    at /vol/gcc/src/hg/trunk/solaris/libgo/go/sync/atomic/atomic.c:78
#1  0x0805e902 in atomic_test.$nested16 () at atomic_test.go:1469
#2  0x0805edac in atomic_test.$nested45 () at atomic_test.go:1505
#3  0x0805e8d1 in sync_atomic_test.TestNilDeref (t=0xde625180)
    at atomic_test.go:1500
#4  0xfe976e4a in testing.tRunner (test=<optimized out>, 
    t.param=<optimized out>)
    at /vol/gcc/src/hg/trunk/solaris/libgo/go/testing/testing.go:391
#5  testing.$thunk13 (__go_thunk_parameter=0xde200688)
    at /vol/gcc/src/hg/trunk/solaris/libgo/go/testing/testing.go:471
#6  0xfe8d005b in kickoff ()
    at /vol/gcc/src/hg/trunk/solaris/libgo/runtime/proc.c:229
#7  0xfe4a5ba2 in makecontext () from /lib/libc.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

1: x/i $pc
=> 0xfeb32ddc <sync_atomic.CompareAndSwapInt32+12>:
    lock cmpxchg %ecx,(%edx)
(gdb) p $ecx
$1 = 0
(gdb) p $edx
$2 = 0

  Rainer

[Bug go/59432] [4.9 regression] sync/atomic FAILs on Solaris/x86

[ro at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Rainer Orth <ro at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.0

[Bug go/59432] [4.9 regression] sync/atomic FAILs on Solaris/x86

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
FYI, the point of the test is to get that segmentation violation and ensure
that the signal handler generates a runtime panic as it should.  The actual
problem is presumably happening some time later.

[Bug go/59432] [4.9 regression] sync/atomic FAILs on Solaris/x86

[ro at CeBiTec dot Uni-Bielefeld.DE]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #2 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
> FYI, the point of the test is to get that segmentation violation and ensure
> that the signal handler generates a runtime panic as it should.  The actual
> problem is presumably happening some time later.

Thanks for the hint.  Investigating further proved a bit difficult:
running with -test.run=TestNilDeref under gdb with SEGV just passed on
ran for hours without anything happening.

Instead, I've run the test with truss -S ABRT (stop on SIGABRT) and got
the following stacktrace from an attached gdb:

#0  0xfe52c955 in _lwp_kill () from /lib/libc.so.1
#1  0xfe5277d9 in thr_kill () from /lib/libc.so.1
#2  0xfe4d3893 in raise () from /lib/libc.so.1
#3  0xfe4b2988 in abort () from /lib/libc.so.1
#4  0xfe8c36a0 in __go_check_defer (frame=frame@entry=0xde836faf) at
/vol/gcc/src/hg/trunk/local/libgo/runtime/go-unwind.c:152
#5  0xfe976e62 in testing.tRunner (test=<optimized out>, t.param=<optimized
out>) at /vol/gcc/src/hg/trunk/local/libgo/go/testing/testing.go:392
#6  testing.$thunk13 (__go_thunk_parameter=0xde200688) at
/vol/gcc/src/hg/trunk/local/libgo/go/testing/testing.go:471
#7  0xfe8d005b in kickoff () at
/vol/gcc/src/hg/trunk/local/libgo/runtime/proc.c:229
#8  0xfe4a5ba2 in makecontext () from /lib/libc.so.1
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

This might be another instance of problems unwinding through makecontext.

    Rainer

[Bug go/59432] [4.9 regression] sync/atomic FAILs on Solaris/x86

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5
                 CC|                            |jakub at gcc dot gnu.org

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.0                       |4.9.1

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.0 has been released

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.1                       |4.9.2

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.1 has been released.

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86

[kdevel at vogtner dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Stefan <kdevel at vogtner dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kdevel at vogtner dot de

--- Comment #5 from Stefan <kdevel at vogtner dot de> ---
PASS: runtime/pprof
Aborted

testing.tRunner
        [redacted]/gcc-4.9.1/bld/gcc-4.9.1/libgo/go/testing/testing.go:392

goroutine 1 [chan receive]:
testing.RunTests
        [redacted]/gcc-4.9.1/bld/gcc-4.9.1/libgo/go/testing/testing.go:472
testing.Main
        [redacted]/gcc-4.9.1/bld/gcc-4.9.1/libgo/go/testing/testing.go:403
main.main
       
[redacted]/gcc-4.9.1/bld/gcc-objdir/x86_64-unknown-linux-gnu/32/libgo/gotest24424/test/_testmain.go:67
FAIL: sync/atomic
make[5]: *** [sync/atomic/check] Fehler 1

Same error in April with 4.9.0:

PASS: runtime/pprof
Aborted

testing.tRunner
        [redacted]/gcc-4.9.0/bld/gcc-4.9.0/libgo/go/testing/testing.go:392

goroutine 1 [chan receive]:
testing.RunTests
        [redacted]/gcc-4.9.0/bld/gcc-4.9.0/libgo/go/testing/testing.go:472
testing.Main
        [redacted]/gcc-4.9.0/bld/gcc-4.9.0/libgo/go/testing/testing.go:403
main.main
       
[redacted]/gcc-4.9.0/bld/gcc-objdir/x86_64-unknown-linux-gnu/32/libgo/gotest
24306/test/_testmain.go:67
FAIL: sync/atomic
make[5]: *** [sync/atomic/check] Fehler 1

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
Please see [1] for the explanation of this problem. Your system doesn't support
.cfi directives and the referred patch doesn't handle this situation.

Since EBX register is marked as fixed, there is nothing we can do.

[1] https://gcc.gnu.org/ml/gcc-patches/2013-11/msg00309.html
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Subject: [Bug fortran/61831] [4.9/ 4.10 Regression] runtime error: pointer being freed was not allocated
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61831

--- Comment #20 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Ok, Dominique, you mean: compile everything with 4.9.1, then recompile
commands.f90 with 4.9.0 and build the executable with 4.9.0?
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida835

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-07-18
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #7)
> Please see [1] for the explanation of this problem. Your system doesn't
> support .cfi directives and the referred patch doesn't handle this situation.
> 
> Since EBX register is marked as fixed, there is nothing we can do.

There is a proposal to allow EBX for allocation also in PIC mode [1]. The
approach proposed in referred poposal would solve this PR (and many others,
too).

[1] https://gcc.gnu.org/ml/gcc/2014-07/msg00058.html
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Subject: [Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on Solaris/x86
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #9 from Uroš Bizjak <ubizjak at gmail dot com> ---
This problem is also seen on CentOS 5, where CFI directives are not supported.
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Subject: [Bug go/61840] [4.9 regression] sync/atomic FAILs on x86_64-unknown-linux-gnu
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida840

--- Comment #4 from Stefan <kdevel at vogtner dot de> ---
Thanks for the comments. I had an old as (binutils 2.19) on the system. After
replacing with binutils 2.22 GCC passes the test.

[Bug go/59432] [4.9/4.10 regression] sync/atomic FAILs on 32bit x86 systems without .cfi directives

[LpSolit at netscape dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i386-pc-solaris2.*          |x86
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-07-18
               Host|i386-pc-solaris2.*          |
            Summary|[4.9/4.10 regression]       |[4.9/4.10 regression]
                   |sync/atomic FAILs on        |sync/atomic FAILs on 32bit
                   |Solaris/x86                 |x86 systems without .cfi
                   |                            |directives
     Ever confirmed|0                           |1
              Build|i386-pc-solaris2.*          |

--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
*** Bug 61840 has been marked as a duplicate of this bug. ***

--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
Confirmed also on CentOS 5 (a system without .cfi directives).
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida845

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It has been fixed by r211424 on trunk.

[Bug go/59432] [4.9/5 regression] sync/atomic FAILs on 32bit x86 systems without .cfi directives

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59432

--- Comment #14 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Oct 15 17:57:17 2014
New Revision: 216281

URL: https://gcc.gnu.org/viewcvs?rev=216281&root=gcc&view=rev
Log:
    PR go/59432
    * config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
    Remove the second alternative.
    (regprefix): Remove mode attribute.
    (atomic_compare_and_swap<mode>): Do not fixup operand 2.
    * config/i386/predicates.md (cmpxchg8b_pic_memory_operand): Remove.

    Revert:
    2013-11-05  Ian Lance Taylor  <iant@google.com>

    * config/i386/sync.md (atomic_compare_and_swap<dwi>_doubleword):
    If possible, add .cfi directives to record change to bx.
    * config/i386/i386.c (ix86_emit_cfi): New function.
    * config/i386/i386-protos.h (ix86_emit_cfi): Declare.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386-protos.h
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/predicates.md
    trunk/gcc/config/i386/sync.md