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* [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
@ 2010-09-09 10:23 ro at gcc dot gnu dot org
2010-09-09 10:39 ` [Bug bootstrap/45611] " ebotcazou at gcc dot gnu dot org
` (10 more replies)
0 siblings, 11 replies; 12+ messages in thread
From: ro at gcc dot gnu dot org @ 2010-09-09 10:23 UTC (permalink / raw)
To: gcc-bugs
Between rev 163993 and 164013, mainline bootstrap started failing on Solaris 2
SPARC. The stage2 libgcc fails to configure because the stage2 xgcc gets a
SIGBUS for
% ../../xgcc -B../../gcc/ -c -g -O2 conftest.c
Bus Error
Running xgcc under gdb, I find that the crash happens here:
Program received signal SIGSEGV, Segmentation fault.
generate_option_input_file (argc=<value optimized out>, argv=<value optimized
out>, lang_mask=<value optimized out>, decoded_options=0xffbff394,
decoded_options_count=0xffbff390) at
/vol/gcc/src/hg/trunk/local/gcc/opts-common.c:750
1: x/i $pc
=> 0x28584 <decode_cmdline_options_to_array+168>: clrx [ %l0 + 0x18 ]
%lo+0x18 isn't 8-byte aligned at that point.
Comparing the assembler code between the working and failing versions, I find
that the following change has happened:
decode_cmdline_options_to_array+0xa4: c0 24 20 14 clr [%l0 +
0x14]
- decode_cmdline_options_to_array+0xa8: c0 24 20 18 clr [%l0 +
0x18]
- decode_cmdline_options_to_array+0xac: c0 24 20 1c clr [%l0 +
0x1c]
- decode_cmdline_options_to_array+0xb0: c4 24 20 24 st %g2, [%l0 +
0x24]
+ decode_cmdline_options_to_array+0xa8: c0 74 20 18 clrx [%l0 +
0x18]
+ decode_cmdline_options_to_array+0xac: c4 24 20 24 st %g2, [%l0 +
0x24]
i.e. two clr insns (which are ok with 4-byte alignment) have been replaced by
a single clrx.
I'll start a reghunt to find the culprit patch.
--
Summary: [4.6 regression] SIGBUS in generate_option_input_file on
Solaris 2/SPARC
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ro at gcc dot gnu dot org
GCC build triplet: sparc-sun-solaris2*
GCC host triplet: sparc-sun-solaris2*
GCC target triplet: sparc-sun-solaris2*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
@ 2010-09-09 10:39 ` ebotcazou at gcc dot gnu dot org
2010-09-09 12:41 ` ro at CeBiTec dot Uni-Bielefeld dot DE
` (9 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2010-09-09 10:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from ebotcazou at gcc dot gnu dot org 2010-09-09 10:38 -------
Presumably 163997 then.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
2010-09-09 10:39 ` [Bug bootstrap/45611] " ebotcazou at gcc dot gnu dot org
@ 2010-09-09 12:41 ` ro at CeBiTec dot Uni-Bielefeld dot DE
2010-09-09 12:43 ` ro at gcc dot gnu dot org
` (8 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ro at CeBiTec dot Uni-Bielefeld dot DE @ 2010-09-09 12:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from ro at CeBiTec dot Uni-Bielefeld dot DE 2010-09-09 12:41 -------
Subject: Re: [4.6 regression] SIGBUS in generate_option_input_file on Solaris
2/SPARC
> ------- Comment #1 from ebotcazou at gcc dot gnu dot org 2010-09-09 10:38 -------
> Presumably 163997 then.
Indeed: a C-only bootstrap on sparc-sun-solaris2.10 works as of rev
163996 and fails with 163997.
Rainer
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
2010-09-09 10:39 ` [Bug bootstrap/45611] " ebotcazou at gcc dot gnu dot org
2010-09-09 12:41 ` ro at CeBiTec dot Uni-Bielefeld dot DE
@ 2010-09-09 12:43 ` ro at gcc dot gnu dot org
2010-09-09 13:28 ` rguenth at gcc dot gnu dot org
` (7 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ro at gcc dot gnu dot org @ 2010-09-09 12:43 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from ro at gcc dot gnu dot org 2010-09-09 12:43 -------
Richard, could you please have a look?
--
ro at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenther at suse dot de
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-09-09 12:43:28
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (2 preceding siblings ...)
2010-09-09 12:43 ` ro at gcc dot gnu dot org
@ 2010-09-09 13:28 ` rguenth at gcc dot gnu dot org
2010-09-10 15:49 ` ro at CeBiTec dot Uni-Bielefeld dot DE
` (6 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-09-09 13:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2010-09-09 13:27 -------
(In reply to comment #3)
> Richard, could you please have a look?
I don't have access to sparc-sun-solaris2*, so I can't bootstrap it (but
at most build a cross cc1).
So please attach a testcase (easiest is probably in a non-bootstrapped
tree run make check and pick a simple one that fails from the C testsuite).
Is sparc-sun-solaris2* a STRICT_ALIGNMENT target? What's the clr instruction?
Is it a store or a load?
The revision in question is supposed to make alignment less strict and I
can't see how this can break anything.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
Target Milestone|--- |4.6.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (3 preceding siblings ...)
2010-09-09 13:28 ` rguenth at gcc dot gnu dot org
@ 2010-09-10 15:49 ` ro at CeBiTec dot Uni-Bielefeld dot DE
2010-09-10 15:52 ` rguenther at suse dot de
` (5 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ro at CeBiTec dot Uni-Bielefeld dot DE @ 2010-09-10 15:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from ro at CeBiTec dot Uni-Bielefeld dot DE 2010-09-10 15:48 -------
Subject: Re: [4.6 regression] SIGBUS in generate_option_input_file on Solaris
2/SPARC
> ------- Comment #4 from rguenth at gcc dot gnu dot org 2010-09-09 13:27 -------
> I don't have access to sparc-sun-solaris2*, so I can't bootstrap it (but
> at most build a cross cc1).
Not even sparc-linux? I very much doubt the bug is Solaris-specific.
> So please attach a testcase (easiest is probably in a non-bootstrapped
> tree run make check and pick a simple one that fails from the C testsuite).
Ok, I'll try to find one.
> Is sparc-sun-solaris2* a STRICT_ALIGNMENT target? What's the clr instruction?
> Is it a store or a load?
Yes, cf. sparc.h.
clr and clrx store 0 (4 or 8 bytes) at the target address, requiring
natural alignment (which fails with your patch for the clrx case).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (4 preceding siblings ...)
2010-09-10 15:49 ` ro at CeBiTec dot Uni-Bielefeld dot DE
@ 2010-09-10 15:52 ` rguenther at suse dot de
2010-09-10 19:10 ` ro at CeBiTec dot Uni-Bielefeld dot DE
` (4 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenther at suse dot de @ 2010-09-10 15:52 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rguenther at suse dot de 2010-09-10 15:51 -------
Subject: Re: [4.6 regression] SIGBUS in generate_option_input_file
on Solaris 2/SPARC
On Fri, 10 Sep 2010, ro at CeBiTec dot Uni-Bielefeld dot DE wrote:
> ------- Comment #5 from ro at CeBiTec dot Uni-Bielefeld dot DE 2010-09-10 15:48 -------
> Subject: Re: [4.6 regression] SIGBUS in generate_option_input_file on Solaris
> 2/SPARC
>
> > ------- Comment #4 from rguenth at gcc dot gnu dot org 2010-09-09 13:27 -------
>
> > I don't have access to sparc-sun-solaris2*, so I can't bootstrap it (but
> > at most build a cross cc1).
>
> Not even sparc-linux? I very much doubt the bug is Solaris-specific.
No, not even sparc-linux.
> > So please attach a testcase (easiest is probably in a non-bootstrapped
> > tree run make check and pick a simple one that fails from the C testsuite).
>
> Ok, I'll try to find one.
>
> > Is sparc-sun-solaris2* a STRICT_ALIGNMENT target? What's the clr instruction?
> > Is it a store or a load?
>
> Yes, cf. sparc.h.
>
> clr and clrx store 0 (4 or 8 bytes) at the target address, requiring
> natural alignment (which fails with your patch for the clrx case).
Thanks.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (5 preceding siblings ...)
2010-09-10 15:52 ` rguenther at suse dot de
@ 2010-09-10 19:10 ` ro at CeBiTec dot Uni-Bielefeld dot DE
2010-09-13 9:35 ` rguenth at gcc dot gnu dot org
` (3 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: ro at CeBiTec dot Uni-Bielefeld dot DE @ 2010-09-10 19:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from ro at CeBiTec dot Uni-Bielefeld dot DE 2010-09-10 19:10 -------
Subject: Re: [4.6 regression] SIGBUS in generate_option_input_file on Solaris
2/SPARC
>> > So please attach a testcase (easiest is probably in a non-bootstrapped
>> > tree run make check and pick a simple one that fails from the C testsuite).
>>
>> Ok, I'll try to find one.
I've found one (in fact, it seems to be the only C one):
+FAIL: gcc.c-torture/execute/20100708-1.c execution, -O2
+FAIL: gcc.c-torture/execute/20100708-1.c execution, -Os
+FAIL: gcc.c-torture/execute/20100708-1.c execution, -O2 -flto
+FAIL: gcc.c-torture/execute/20100708-1.c execution, -O2 -fwhopr
Without and with your patch, it shows the following difference, just
like the change that causes xgcc to get a SIGBUS:
--- /homes/ro/20100708-1.s 2010-09-10 20:53:11.730613000 +0200
+++ 20100708-1.s 2010-09-10 20:51:09.161003200 +0200
@@ -7,8 +7,7 @@
f:
mov 16, %g1
.LL2:
- st %g0, [%o0+8]
- st %g0, [%o0+12]
+ stx %g0, [%o0+8]
st %g0, [%o0+16]
addcc %g1, -1, %g1
bne,pt %icc, .LL2
clr and clrx are just synthetic instructions, the real thing can be
seen above: st resp. stx are stores of 4 resp. 8 bytes, and the %g0
register always reads as 0.
%o0 isn't 8-byte aligned in this case, so the testcase dies with SIGBUS.
Compile with
$ cc1 20100708-1.c -mcpu=v9 -O2
to reproduce.
Thanks.
Rainer
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (6 preceding siblings ...)
2010-09-10 19:10 ` ro at CeBiTec dot Uni-Bielefeld dot DE
@ 2010-09-13 9:35 ` rguenth at gcc dot gnu dot org
2010-09-13 10:47 ` rguenth at gcc dot gnu dot org
` (2 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-09-13 9:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from rguenth at gcc dot gnu dot org 2010-09-13 09:35 -------
I have a patch.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|WAITING |ASSIGNED
Last reconfirmed|2010-09-09 12:43:28 |2010-09-13 09:35:04
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (7 preceding siblings ...)
2010-09-13 9:35 ` rguenth at gcc dot gnu dot org
@ 2010-09-13 10:47 ` rguenth at gcc dot gnu dot org
2010-09-13 10:48 ` rguenth at gcc dot gnu dot org
2010-09-13 10:55 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-09-13 10:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from rguenth at gcc dot gnu dot org 2010-09-13 10:47 -------
Subject: Bug 45611
Author: rguenth
Date: Mon Sep 13 10:47:28 2010
New Revision: 164244
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164244
Log:
2010-09-13 Richard Guenther <rguenther@suse.de>
PR tree-optimization/45611
* tree-ssa-loop-ivopts.c (rewrite_use_nonlinear_expr): Fix typo.
(copy_ref_info): Likewise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-loop-ivopts.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (8 preceding siblings ...)
2010-09-13 10:47 ` rguenth at gcc dot gnu dot org
@ 2010-09-13 10:48 ` rguenth at gcc dot gnu dot org
2010-09-13 10:55 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-09-13 10:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from rguenth at gcc dot gnu dot org 2010-09-13 10:48 -------
Should be fixed now.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug bootstrap/45611] [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC
2010-09-09 10:23 [Bug bootstrap/45611] New: [4.6 regression] SIGBUS in generate_option_input_file on Solaris 2/SPARC ro at gcc dot gnu dot org
` (9 preceding siblings ...)
2010-09-13 10:48 ` rguenth at gcc dot gnu dot org
@ 2010-09-13 10:55 ` ebotcazou at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2010-09-13 10:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from ebotcazou at gcc dot gnu dot org 2010-09-13 10:55 -------
*** Bug 45421 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45611
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2010-09-09 10:39 ` [Bug bootstrap/45611] " ebotcazou at gcc dot gnu dot org
2010-09-09 12:41 ` ro at CeBiTec dot Uni-Bielefeld dot DE
2010-09-09 12:43 ` ro at gcc dot gnu dot org
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2010-09-13 9:35 ` rguenth at gcc dot gnu dot org
2010-09-13 10:47 ` rguenth at gcc dot gnu dot org
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