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* [Bug c/114509] New: Infinite loop with openmp
@ 2024-03-28 6:39 gccbugs at dima dot secretsauce.net
2024-03-28 7:03 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop with openmp after errors in some cases pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: gccbugs at dima dot secretsauce.net @ 2024-03-28 6:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114509
Bug ID: 114509
Summary: Infinite loop with openmp
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gccbugs at dima dot secretsauce.net
Target Milestone: ---
Created attachment 57827
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57827&action=edit
Reduced reproducer
I git a bug in gcc 13.2 where an openmp loop causes he compiler to spin the
cpu, and never finish. I used creduce to minimize the test case, and the
reduced source is attached.
I'm running Debian GNU/Linux with gcc=4:13.2.0-1. I get an infinite loop with
gcc-13 -fopenmp -c -o /dev/null /tmp/infinite-openmp.c
I happen to also have gcc-10 and gcc-11 installed, and they both produce an
infinite loop with that input as well.
Thanks
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop with openmp after errors in some cases
2024-03-28 6:39 [Bug c/114509] New: Infinite loop with openmp gccbugs at dima dot secretsauce.net
@ 2024-03-28 7:03 ` pinskia at gcc dot gnu.org
2024-03-29 23:48 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE " law at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-03-28 7:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114509
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2024-03-28
Keywords| |openmp
Summary|Infinite loop with openmp |[11/12/13/14 Regression] an
| |infinite loop with openmp
| |after errors in some cases
Target Milestone|--- |11.5
Status|UNCONFIRMED |NEW
Known to fail| |7.5.0, 9.1.0
Component|c |middle-end
Known to work| |7.2.0, 7.4.0
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
With checking enabled we get:
```
during GIMPLE pass: omplower
t5665.c:11:9: internal compiler error: tree check: expected tree that contains
‘decl minimal’ structure, have ‘error_mark’ in remap_type_1, at
tree-inline.cc:563
11 | #pragma omp parallel for
| ^~~
0x880d2a tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
../../gcc/tree.cc:9129
0x829211 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../gcc/tree.h:3766
0x829211 remap_type_1
../../gcc/tree-inline.cc:563
0x10e3c92 remap_type(tree_node*, copy_body_data*)
../../gcc/tree-inline.cc:713
0x10e38ba remap_type_1
../../gcc/tree-inline.cc:425
0x10e3c92 remap_type(tree_node*, copy_body_data*)
../../gcc/tree-inline.cc:713
0xec7178 fixup_remapped_decl
../../gcc/omp-low.cc:905
0xecb9f2 scan_sharing_clauses
../../gcc/omp-low.cc:1833
0xecfccb scan_omp_parallel
../../gcc/omp-low.cc:2345
0xecfccb scan_omp_1_stmt
../../gcc/omp-low.cc:4148
0xd138ea walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gimple-walk.cc:618
0xd13ac5 walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gimple-walk.cc:51
0xd139e1 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gimple-walk.cc:681
0xd13ac5 walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gimple-walk.cc:51
0xd139a1 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gimple-walk.cc:735
0xd13ac5 walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gimple-walk.cc:51
0xedc43a scan_omp
../../gcc/omp-low.cc:4284
0xedc43a execute_lower_omp
../../gcc/omp-low.cc:14619
0xedc43a execute
../../gcc/omp-low.cc:14683
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
```
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE with openmp after errors in some cases
2024-03-28 6:39 [Bug c/114509] New: Infinite loop with openmp gccbugs at dima dot secretsauce.net
2024-03-28 7:03 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop with openmp after errors in some cases pinskia at gcc dot gnu.org
@ 2024-03-29 23:48 ` law at gcc dot gnu.org
2024-04-02 8:01 ` rguenth at gcc dot gnu.org
2024-04-17 14:42 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: law at gcc dot gnu.org @ 2024-03-29 23:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114509
Jeffrey A. Law <law at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |law at gcc dot gnu.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE with openmp after errors in some cases
2024-03-28 6:39 [Bug c/114509] New: Infinite loop with openmp gccbugs at dima dot secretsauce.net
2024-03-28 7:03 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop with openmp after errors in some cases pinskia at gcc dot gnu.org
2024-03-29 23:48 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE " law at gcc dot gnu.org
@ 2024-04-02 8:01 ` rguenth at gcc dot gnu.org
2024-04-17 14:42 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-04-02 8:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114509
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P2
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE with openmp after errors in some cases
2024-03-28 6:39 [Bug c/114509] New: Infinite loop with openmp gccbugs at dima dot secretsauce.net
` (2 preceding siblings ...)
2024-04-02 8:01 ` rguenth at gcc dot gnu.org
@ 2024-04-17 14:42 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu.org @ 2024-04-17 14:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114509
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> ---
Reduced testcase:
void bar (void *);
void
foo (int x)
{
struct S { int a[x]; int b; } s;
#pragma omp parallel for
for (int i = 0; i < 10; i++)
bar (&s);
}
We don't really support variable length structures/unions in OpenMP/OpenACC
lowering/expansion, and I don't see why we should spend time on that, variable
length structures/unions just shouldn't be used in C (they are already invalid
in C++ and not present in Fortran either), I think that extension exists just
because Ada needs to support that. Though Ada on the other side doesn't
support OpenMP/OpenACC.
So, I think we should just sorry if something attempts to privatize/map
variable length structure/union; making it shared should be fine.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-04-17 14:42 UTC | newest]
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2024-03-28 6:39 [Bug c/114509] New: Infinite loop with openmp gccbugs at dima dot secretsauce.net
2024-03-28 7:03 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop with openmp after errors in some cases pinskia at gcc dot gnu.org
2024-03-29 23:48 ` [Bug middle-end/114509] [11/12/13/14 Regression] an infinite loop or ICE " law at gcc dot gnu.org
2024-04-02 8:01 ` rguenth at gcc dot gnu.org
2024-04-17 14:42 ` jakub at gcc dot gnu.org
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