* [Bug bootstrap/96404] [10 Regression] AIX Bootstrap failure with DWARF debug changes
2020-07-31 17:43 [Bug bootstrap/96404] New: [10 Regression] AIX Bootstrap failure with DWARF debug changes dje at gcc dot gnu.org
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From: dje at gcc dot gnu.org @ 2020-07-31 17:44 UTC (permalink / raw)
To: gcc-bugs
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David Edelsohn <dje at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |96383
Target| |powerpc-ibm-aix*
Severity|normal |blocker
CC| |rguenth at gcc dot gnu.org
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96383
[Bug 96383] [8/9/10 Regression] Full ABI information missing from GCC compiled
C
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To: gcc-bugs
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Sergei Trofimovich <slyfox at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |slyfox at gcc dot gnu.org
--- Comment #1 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
*** Bug 96405 has been marked as a duplicate of this bug. ***
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2020-07-31 17:44 ` [Bug bootstrap/96404] " dje at gcc dot gnu.org
2020-07-31 21:05 ` slyfox at gcc dot gnu.org
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To: gcc-bugs
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--- Comment #2 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Seeing this as well on amd64-linux:
$ LANG=C ./xgcc -B. -v
Reading specs from ./specs
COLLECT_GCC=./xgcc
COLLECT_LTO_WRAPPER=./lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/tmp/portage-tmpdir/portage/sys-devel/gcc-11.0.0_pre9999/work/gcc-11.0.0_pre9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/11.0.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include/g++-v11
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/python
--enable-languages=c,c++,go,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 11.0.0_pre9999 p2, commit
8011f718e241febd6b7a9dae01cde49817f299c4' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp
--disable-libada --disable-systemtap --enable-valgrind-annotations
--enable-vtable-verify --without-zstd --enable-lto --with-isl
--disable-isl-version-check --enable-default-pie --enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200731 (experimental) (Gentoo 11.0.0_pre9999 p2, commit
8011f718e241febd6b7a9dae01cde49817f299c4)
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--- Comment #3 from David Edelsohn <dje at gcc dot gnu.org> ---
This apparently occurs on x86_64-*-linux, so this is a more general problem.
It does not appear to be due to the debug patch.
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From: dje at gcc dot gnu.org @ 2020-07-31 21:07 UTC (permalink / raw)
To: gcc-bugs
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David Edelsohn <dje at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Target|powerpc-ibm-aix* |*-*-*
Last reconfirmed| |2020-07-31
--- Comment #4 from David Edelsohn <dje at gcc dot gnu.org> ---
This seems to be present for x86_64-*-linux also.
I reverted the debug change, but the failure still is present. Continuing to
search for the offending patch.
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To: gcc-bugs
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--- Comment #5 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Comparing example file:
$ LANG=C cmp --ignore-initial=16 ./stage2-x86_64-pc-linux-gnu/libgomp/task.o
./stage3-x86_64-pc-linux-gnu/libgomp/task.o
./stage2-x86_64-pc-linux-gnu/libgomp/task.o
./stage3-x86_64-pc-linux-gnu/libgomp/task.o differ: char 325521, line 4234
Looks like there is slight non-determinism in .debug_loc. Don't know if it
comes from gcc or binutils. Both wibbly entries are the same symbol offset:
$ diff -U10000 <(x86_64-pc-linux-gnu-readelf -a
stage2-x86_64-pc-linux-gnu/libgomp/task.o) <(x86_64-pc-linux-gnu-readelf -a
stage3-x86_64-pc-linux-gnu/libgomp/task.o) | egrep 'section|^[-+]'
Relocation section '.rela.debug_loc' at offset 0x36938 contains 7185 entries:
-00000000e312 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
-00000000e320 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000e312 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
+00000000e320 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000e6f5 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
-00000000e703 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000e6f5 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
+00000000e703 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000e9c4 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
-00000000e9d2 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000e9c4 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
+00000000e9d2 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000ec69 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000ec69 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000eecd 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000eecd 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000ef61 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000ef61 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000f01f 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000f01f 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-00000000f388 000200000001 R_X86_64_64 0000000000000000 .text + 66b8
+00000000f388 000200000001 R_X86_64_64 0000000000000000 .text + 66cd
-0000000112e3 000200000001 R_X86_64_64 0000000000000000 .text + 5a84
+0000000112e3 000200000001 R_X86_64_64 0000000000000000 .text + 5a79
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To: gcc-bugs
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--- Comment #6 from David Edelsohn <dje at gcc dot gnu.org> ---
Created attachment 48969
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48969&action=edit
stage2 dbgcnt.s
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To: gcc-bugs
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--- Comment #7 from David Edelsohn <dje at gcc dot gnu.org> ---
Created attachment 48970
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48970&action=edit
stage3 dbgcnt.s
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To: gcc-bugs
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--- Comment #8 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Created attachment 48971
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48971&action=edit
task.S-stage2-stage3.tar.gz
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To: gcc-bugs
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--- Comment #9 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
valgrind says there is use of uninitialized variable:
==3676055== Conditional jump or move depends on uninitialised value(s)
==3676055== at 0xDBED3B: vt_find_locations() (var-tracking.c:7230)
==3676055== by 0xDBF2FB: variable_tracking_main_1() (var-tracking.c:10519)
==3676055== by 0xDBF49B: variable_tracking_main (var-tracking.c:10565)
==3676055== by 0xDBF49B: (anonymous
namespace)::pass_variable_tracking::execute(function*) (var-tracking.c:10602)
==3676055== by 0xA71977: execute_one_pass(opt_pass*) (passes.c:2509)
==3676055== by 0xA7229F: execute_pass_list_1(opt_pass*) (passes.c:2597)
==3676055== by 0xA722B1: execute_pass_list_1(opt_pass*) (passes.c:2598)
==3676055== by 0xA722B1: execute_pass_list_1(opt_pass*) (passes.c:2598)
==3676055== by 0xA722D8: execute_pass_list(function*, opt_pass*)
(passes.c:2608)
==3676055== by 0x748A1D: cgraph_node::expand() (cgraphunit.c:2301)
==3676055== by 0x749E85: expand_all_functions (cgraphunit.c:2472)
==3676055== by 0x749E85: symbol_table::compile() [clone .part.0]
(cgraphunit.c:2835)
==3676055== by 0x74BF22: compile (cgraphunit.c:2748)
==3676055== by 0x74BF22: symbol_table::finalize_compilation_unit()
(cgraphunit.c:3013)
==3676055== by 0xB35FF0: compile_file() (toplev.c:483)
==3676055== by 0x5ED309: do_compile (toplev.c:2331)
==3676055== by 0x5ED309: toplev::main(int, char**) (toplev.c:2470)
==3676055== by 0x5F0FFB: main (main.c:39)
==3676055== Uninitialised value was created by a heap allocation
==3676055== at 0x483779F: malloc (vg_replace_malloc.c:307)
==3676055== by 0x14EE80B: xmalloc (xmalloc.c:147)
==3676055== by 0x14911F9: sbitmap_alloc(unsigned int) (sbitmap.c:51)
==3676055== by 0xDBE6BA: vt_find_locations() (var-tracking.c:7097)
==3676055== by 0xDBF2FB: variable_tracking_main_1() (var-tracking.c:10519)
==3676055== by 0xDBF49B: variable_tracking_main (var-tracking.c:10565)
==3676055== by 0xDBF49B: (anonymous
namespace)::pass_variable_tracking::execute(function*) (var-tracking.c:10602)
==3676055== by 0xA71977: execute_one_pass(opt_pass*) (passes.c:2509)
==3676055== by 0xA7229F: execute_pass_list_1(opt_pass*) (passes.c:2597)
==3676055== by 0xA722B1: execute_pass_list_1(opt_pass*) (passes.c:2598)
==3676055== by 0xA722B1: execute_pass_list_1(opt_pass*) (passes.c:2598)
==3676055== by 0xA722D8: execute_pass_list(function*, opt_pass*)
(passes.c:2608)
==3676055== by 0x748A1D: cgraph_node::expand() (cgraphunit.c:2301)
==3676055== by 0x749E85: expand_all_functions (cgraphunit.c:2472)
==3676055== by 0x749E85: symbol_table::compile() [clone .part.0]
(cgraphunit.c:2835)
==3676055== by 0x74BF22: compile (cgraphunit.c:2748)
==3676055== by 0x74BF22: symbol_table::finalize_compilation_unit()
(cgraphunit.c:3013)
==3676055== by 0xB35FF0: compile_file() (toplev.c:483)
==3676055== by 0x5ED309: do_compile (toplev.c:2331)
==3676055== by 0x5ED309: toplev::main(int, char**) (toplev.c:2470)
==3676055== by 0x5F0FFB: main (main.c:39)
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--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> ---
r11-2445 succeeds. I am testing r11-2447 and then r11-2451.
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--- Comment #11 from David Edelsohn <dje at gcc dot gnu.org> ---
r11-2447 fails. Testing r11-2446.
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--- Comment #12 from David Edelsohn <dje at gcc dot gnu.org> ---
r11-2446 succeeds and r11-2447 fails, so the failure (at least on AIX) is the
var-tracking dataflow patch.
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To: gcc-bugs
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--- Comment #13 from David Edelsohn <dje at gcc dot gnu.org> ---
The symptom I see on AIX is that the labels for DWARF variable locations differ
between stage2 and stage3 for some files. The difference started with the
recent change to the var-tracking pass. Once the labels diverge, the addresses
no longer match and the object file differ.
The var-tracking dump files are over 1GB with lots of address differences, but
it doesn't contain any differences in the BB dump output for vt_find_locations,
which is the function that was changed.
The assembly file differences give the appearance of an unstable sort. The
beginning of the difference for an assembly file looks like:
--- tree-vrp.S 2020-08-01 19:42:00.000000000 -0400
+++ ../gcc/tree-vrp.S 2020-08-01 19:43:33.000000000 -0400
@@ -38428,8 +38428,8 @@
LM..7111:
addi 19,1,792
li 20,1
-L..2070:
LVL..2903:
+L..2070:
LBE..22006:
LBE..22005:
LBE..22004:
@@ -38466,6 +38466,7 @@
LM..7114:
cmpwi 0,31,0
beq 0,L..2043
+LVL..2904:
LBB..22481:
LM..7115:
LM..7116:
@@ -38475,12 +38476,12 @@
mr 30,31
bl .memcpy
nop
-LVL..2904:
+LVL..2905:
LM..7117:
LM..7118:
LM..7119:
lwz 27,8(31)
-LVL..2905:
+LVL..2906:
LM..7120:
LM..7121:
lwz 9,4(27)
@@ -38489,7 +38490,7 @@
beq 0,L..2348
L..2044:
LM..7123:
-LVL..2906:
+LVL..2907:
LBE..22481:
LBE..22508:
LBE..22535:
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From: slyfox at gcc dot gnu.org @ 2020-08-02 7:53 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #14 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #9)
> valgrind says there is use of uninitialized variable:
I picked _gcov.c and minimized it's unstable compilation under cvise. Then
minimized it under presence of warnings related to var-tracking. Here is the
minimized example:
$ cat _gcov.c
int a;
int b(void) {
for (;;)
for (; a;)
for (unsigned c; c < b; c++)
;
}
$ valgrind --trace-children=yes --track-origins=yes --num-callers=50 --quiet
stage3-gcc/xgcc -Bstage3-gcc -O2 -g -o _gcov-s3.S -DL_gcov -S _gcov.c
==913420== Conditional jump or move depends on uninitialised value(s)
==913420== at 0xDBDABB: vt_find_locations() (in
/home/slyfox/tmp/portage/sys-devel/gcc-11.0.0_pre9999/work/build/stage3-gcc/cc1)
...
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2020-08-02 7:53 ` slyfox at gcc dot gnu.org
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From: slyfox at gcc dot gnu.org @ 2020-08-02 10:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
--- Comment #15 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #14)
> (In reply to Sergei Trofimovich from comment #9)
> > valgrind says there is use of uninitialized variable:
>
> I picked _gcov.c and minimized it's unstable compilation under cvise. Then
> minimized it under presence of warnings related to var-tracking. Here is the
> minimized example:
>
> $ cat _gcov.c
> int a;
> int b(void) {
> for (;;)
> for (; a;)
> for (unsigned c; c < b; c++)
> ;
> }
>
> $ valgrind --trace-children=yes --track-origins=yes --num-callers=50 --quiet
> stage3-gcc/xgcc -Bstage3-gcc -O2 -g -o _gcov-s3.S -DL_gcov -S _gcov.c
>
> ==913420== Conditional jump or move depends on uninitialised value(s)
> ==913420== at 0xDBDABB: vt_find_locations() (in
> /home/slyfox/tmp/portage/sys-devel/gcc-11.0.0_pre9999/work/build/stage3-gcc/
> cc1)
> ...
The following patch seems to fix use of uninitialized variable:
--- a/gcc/var-tracking.c
+++ b/gcc/var-tracking.c
@@ -7089,20 +7089,21 @@ vt_find_locations (void)
auto_vec<std::pair<int, int> > toplevel_scc_extents;
int n = rev_post_order_and_mark_dfs_back_seme
(cfun, single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)), exit_bbs, true,
rc_order, &toplevel_scc_extents);
for (i = 0; i < n; i++)
bb_order[rc_order[i]] = i;
in_worklist = sbitmap_alloc (last_basic_block_for_fn (cfun));
in_pending = sbitmap_alloc (last_basic_block_for_fn (cfun));
bitmap_clear (in_worklist);
+ bitmap_clear (in_pending);
/* We're performing the dataflow iteration independently over the
toplevel SCCs plus leading non-cyclic entry blocks and separately
over the tail. That ensures best memory locality and the least
number of visited blocks. */
unsigned extent = 0;
int curr_start = -1;
int curr_end = -1;
do
{
Don't know if the change correct or papers over the problem. Looking at the
initialization of 'in_pending' right below it does not seem to assume full
'in_pending' initialization.
I'll check if it fixes bootstrap for me.
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2020-08-02 16:45 ` dje at gcc dot gnu.org
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From: slyfox at gcc dot gnu.org @ 2020-08-02 12:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
--- Comment #16 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Sent https://gcc.gnu.org/pipermail/gcc-patches/2020-August/551174.html for
review.
> I'll check if it fixes bootstrap for me.
The patch fixed gcc bootstrap for me.
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2020-08-02 18:37 ` cvs-commit at gcc dot gnu.org
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From: dje at gcc dot gnu.org @ 2020-08-02 16:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
--- Comment #17 from David Edelsohn <dje at gcc dot gnu.org> ---
The patch fixes bootstrap for AIX.
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2020-08-02 16:45 ` dje at gcc dot gnu.org
@ 2020-08-02 18:37 ` cvs-commit at gcc dot gnu.org
2020-08-02 18:42 ` [Bug bootstrap/96404] [11 " slyfox at gcc dot gnu.org
2020-08-03 7:00 ` rguenth at gcc dot gnu.org
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From: cvs-commit at gcc dot gnu.org @ 2020-08-02 18:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sergei Trofimovich <slyfox@gcc.gnu.org>:
https://gcc.gnu.org/g:6e46b3f3da5c03bc529b3690dd0995927feb9142
commit r11-2491-g6e46b3f3da5c03bc529b3690dd0995927feb9142
Author: Sergei Trofimovich <siarheit@google.com>
Date: Sun Aug 2 12:03:55 2020 +0100
var-tracking: fix uninitialised use of 'in_pending' [PR96404]
r11-2447-g:1212cfad093 ("Improve var-tracking dataflow
iteration order") changed 'in_pending' initialization
from:
in_pending = sbitmap_alloc (last_basic_block_for_fn (cfun));
bitmap_ones (in_pending);
to more complex partial bit population algorithm. Due to presence
of uninitialized bits gcc started injecting extra debug entries
in seemigly arbitrary locations and started failing stage2/stage3
bootstrap comparison.
valgrind detected unilitialized bits as:
Conditional jump or move depends on uninitialised value(s)
at 0xDBED3B: vt_find_locations() (var-tracking.c:7230)
by 0xDBF2FB: variable_tracking_main_1() (var-tracking.c:10519)
...
Uninitialised value was created by a heap allocation
at 0x483779F: malloc (vg_replace_malloc.c:307)
by 0x14EE80B: xmalloc (xmalloc.c:147)
by 0x14911F9: sbitmap_alloc(unsigned int) (sbitmap.c:51)
...
The fix explicitly initializes 'in_pending' bitmap with zeros.
2020-08-02 Sergei Trofimovich <siarheit@google.com>
gcc/
PR bootstrap/96404
* var-tracking.c (vt_find_locations): Fully initialize
all 'in_pending' bits.
^ permalink raw reply [flat|nested] 22+ messages in thread* [Bug bootstrap/96404] [11 Regression] Bootstrap failure
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From: slyfox at gcc dot gnu.org @ 2020-08-02 18:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
Sergei Trofimovich <slyfox at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Assignee|unassigned at gcc dot gnu.org |slyfox at gcc dot gnu.org
Summary|[10 Regression] Bootstrap |[11 Regression] Bootstrap
|failure |failure
Resolution|--- |FIXED
Target Milestone|--- |11.0
--- Comment #19 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Should be fixed now.
I tweaked bug subject to point at gcc-11 as the only affected version (I assume
gcc-10 works).
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2020-08-02 18:42 ` [Bug bootstrap/96404] [11 " slyfox at gcc dot gnu.org
@ 2020-08-03 7:00 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2020-08-03 7:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96404
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ro at gcc dot gnu.org
--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 96422 has been marked as a duplicate of this bug. ***
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