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* [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
@ 2011-10-09 19:07 zsojka at seznam dot cz
2011-10-10 9:43 ` [Bug tree-optimization/50682] " rguenth at gcc dot gnu.org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: zsojka at seznam dot cz @ 2011-10-09 19:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
Bug #: 50682
Summary: [4.7 Regression] ICE: SIGSEGV in main_block_label with
-O2 -fnon-call-exceptions -ftracer
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: zsojka@seznam.cz
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 25450
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25450
reduced testcase
Compiler output:
$ gcc -O2 -fnon-call-exceptions -ftracer -fno-tree-ccp -fno-tree-copy-prop
-fno-tree-dce testcase.C
==3654== Invalid read of size 4
==3654== at 0xB65233: main_block_label(tree_node*) (tree-cfg.c:1082)
==3654== by 0xB6965E: cleanup_dead_labels() (tree-cfg.c:1111)
==3654== by 0xBBA2EC: execute_cleanup_cfg_post_optimizing()
(tree-optimize.c:162)
==3654== by 0xA62BF7: execute_one_pass(opt_pass*) (passes.c:2064)
==3654== by 0xA62F64: execute_pass_list(opt_pass*) (passes.c:2119)
==3654== by 0xBBACFD: tree_rest_of_compilation(tree_node*)
(tree-optimize.c:420)
==3654== by 0x815EE5: cgraph_expand_function(cgraph_node*)
(cgraphunit.c:1805)
==3654== by 0x817E2B: cgraph_optimize() (cgraphunit.c:1864)
==3654== by 0x818219: cgraph_finalize_compilation_unit() (cgraphunit.c:1312)
==3654== by 0x64266A: cp_write_global_declarations() (decl2.c:4008)
==3654== by 0xB58803: toplev_main(int, char**) (toplev.c:581)
==3654== by 0x674ED2C: (below main) (in /lib64/libc-2.12.2.so)
==3654== Address 0x50 is not stack'd, malloc'd or (recently) free'd
==3654==
testcase.C: In function 'void test01()':
testcase.C:29:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
Tested revisions:
r179711 - crash
r178498 - crash
4.6 r177922 - OK
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
@ 2011-10-10 9:43 ` rguenth at gcc dot gnu.org
2011-10-10 15:34 ` rguenth at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-10 9:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.7.0
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
2011-10-10 9:43 ` [Bug tree-optimization/50682] " rguenth at gcc dot gnu.org
@ 2011-10-10 15:34 ` rguenth at gcc dot gnu.org
2011-11-23 16:53 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-10 15:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011-10-10
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-10 15:33:23 UTC ---
Confirmed.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
2011-10-10 9:43 ` [Bug tree-optimization/50682] " rguenth at gcc dot gnu.org
2011-10-10 15:34 ` rguenth at gcc dot gnu.org
@ 2011-11-23 16:53 ` jakub at gcc dot gnu.org
2011-11-23 17:17 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-11-23 16:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-23 16:43:36 UTC ---
The problem here is that with all the -fno-* options we end up with code like:
<bb 14>:
D.2284_38 = &__size;
<bb 35>:
# D.2281_58 = PHI <&__size(14)>
D.2283_59 = D.2281_58;
D.2281_60 = D.2281_58;
D.2281_61 = D.2281_58;
__r_62 = *D.2281_58;
at the beginning of ehcleanup2 pass. Then we clean up eh and as something
changed, TODO_cleanup_cfg is requested. Only the cfgcleanup after ehcleanup2
will attempt to merge the above two blocks, which changes it to
D.2284_38 = &__size;
D.2283_59 = &__size;
D.2281_60 = &__size;
D.2281_61 = &__size;
__r_62 = &__size;
which unfortunately means that the last stmt in thise bb is considered to no
longer throw and gimple_purge_dead_eh_edges is called on it. But there is no
further ehcleanup afterwards. Calling remove_unreachable_handlers () from
execute_cleanup_cfg_post_optimizing or scheduling another ehcleanup pass right
before it would fix it, but it would make compilation tiny bit slower because
of another pass through all stmts.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
` (2 preceding siblings ...)
2011-11-23 16:53 ` jakub at gcc dot gnu.org
@ 2011-11-23 17:17 ` jakub at gcc dot gnu.org
2011-11-27 16:05 ` zsojka at seznam dot cz
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-11-23 17:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-23 16:47:04 UTC ---
Created attachment 25903
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25903
gcc47-pr50682.patch
We can perhaps only call it if any landing pads were actually removed after the
last ehcleanup pass.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
` (3 preceding siblings ...)
2011-11-23 17:17 ` jakub at gcc dot gnu.org
@ 2011-11-27 16:05 ` zsojka at seznam dot cz
2011-11-28 21:06 ` jakub at gcc dot gnu.org
2011-11-28 21:18 ` jakub at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: zsojka at seznam dot cz @ 2011-11-27 16:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
--- Comment #4 from Zdenek Sojka <zsojka at seznam dot cz> 2011-11-27 13:13:45 UTC ---
Created attachment 25919
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25919
another testcase
This testcase doesn't need any -fno-* flags. It might be the same problem (the
backtrace is the same).
$ gcc -O2 -fnon-call-exceptions -mfma4 testcase.C
==18808== Invalid read of size 4
==18808== at 0xB961F3: main_block_label(tree_node*) (tree-cfg.c:1092)
==18808== by 0xB9A56B: cleanup_dead_labels() (tree-cfg.c:1121)
==18808== by 0xBEAB9C: execute_cleanup_cfg_post_optimizing()
(tree-optimize.c:162)
==18808== by 0xA89CF4: execute_one_pass(opt_pass*) (passes.c:2074)
==18808== by 0xA8A094: execute_pass_list(opt_pass*) (passes.c:2129)
==18808== by 0xBEB5BD: tree_rest_of_compilation(tree_node*)
(tree-optimize.c:420)
==18808== by 0x83F949: cgraph_expand_function(cgraph_node*)
(cgraphunit.c:1819)
==18808== by 0x8416EB: cgraph_optimize() (cgraphunit.c:1886)
==18808== by 0x841E59: cgraph_finalize_compilation_unit()
(cgraphunit.c:1327)
==18808== by 0x6632EA: cp_write_global_declarations() (decl2.c:4050)
==18808== by 0xB7EE43: toplev_main(int, char**) (toplev.c:581)
==18808== by 0x674ED2C: (below main) (in /lib64/libc-2.12.2.so)
==18808== Address 0x50 is not stack'd, malloc'd or (recently) free'd
==18808==
testcase.C: In function 'void test01()':
testcase.C:21:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
However, when the code is modified a little (ternary operator is replaced by
if/else), the crash is different:
$ gcc -O2 -fnon-call-exceptions -mfma4 testcase.C
testcase.C: In function 'void test01()':
testcase.C:21:1: error: BB 2 can not throw but has an EH edge
testcase.C:21:1: internal compiler error: verify_flow_info failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
` (4 preceding siblings ...)
2011-11-27 16:05 ` zsojka at seznam dot cz
@ 2011-11-28 21:06 ` jakub at gcc dot gnu.org
2011-11-28 21:18 ` jakub at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-11-28 21:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-28 21:02:33 UTC ---
Author: jakub
Date: Mon Nov 28 21:02:27 2011
New Revision: 181785
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181785
Log:
PR tree-optimization/50682
* tree-eh.c (maybe_remove_unreachable_handlers): New function.
* tree-flow.h (maybe_remove_unreachable_handlers): New prototype.
* tree-optimize.c (execute_cleanup_cfg_post_optimizing): Call it.
* g++.dg/opt/pr50682.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/opt/pr50682.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-eh.c
trunk/gcc/tree-flow.h
trunk/gcc/tree-optimize.c
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/50682] [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer
2011-10-09 19:07 [Bug tree-optimization/50682] New: [4.7 Regression] ICE: SIGSEGV in main_block_label with -O2 -fnon-call-exceptions -ftracer zsojka at seznam dot cz
` (5 preceding siblings ...)
2011-11-28 21:06 ` jakub at gcc dot gnu.org
@ 2011-11-28 21:18 ` jakub at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-11-28 21:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50682
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-28 21:08:07 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 8+ messages in thread
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2011-10-10 9:43 ` [Bug tree-optimization/50682] " rguenth at gcc dot gnu.org
2011-10-10 15:34 ` rguenth at gcc dot gnu.org
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