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* [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt()
@ 2023-12-20 12:06 zsojka at seznam dot cz
2023-12-21 1:16 ` [Bug sanitizer/113092] _BitInt of shift vs ubsan pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: zsojka at seznam dot cz @ 2023-12-20 12:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
Bug ID: 113092
Summary: SanitizerTool: CHECK failed: ubsan_value.cpp:69
"((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0)
with _BitInt()
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 56909
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56909&action=edit
reduced testcase
Using UBsan with _BitInt() fails at runtime:
$ x86_64-pc-linux-gnu-gcc -fsanitize=undefined testcase.c
$ ./a.out
SanitizerTool: CHECK failed: ubsan_value.cpp:69
"((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) (tid=9442)
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-6742-20231220113252-gbe9e8de6284-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-6742-20231220113252-gbe9e8de6284-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231220 (experimental) (GCC)
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug sanitizer/113092] _BitInt of shift vs ubsan
2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
@ 2023-12-21 1:16 ` pinskia at gcc dot gnu.org
2023-12-21 1:19 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-21 1:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like this fails even in clang trunk:
UndefinedBehaviorSanitizer: CHECK failed: ubsan_value.cpp:86 "((0 &&
"unexpected bit width")) != (0)" (0x0, 0x0) (tid=1)
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug sanitizer/113092] _BitInt of shift vs ubsan
2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
2023-12-21 1:16 ` [Bug sanitizer/113092] _BitInt of shift vs ubsan pinskia at gcc dot gnu.org
@ 2023-12-21 1:19 ` pinskia at gcc dot gnu.org
2023-12-21 10:16 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-12-21 1:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
See Also| |https://github.com/llvm/llv
| |m-project/issues/76113
Last reconfirmed| |2023-12-21
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, Filed it upstream too:
https://github.com/llvm/llvm-project/issues/76113
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug sanitizer/113092] _BitInt of shift vs ubsan
2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
2023-12-21 1:16 ` [Bug sanitizer/113092] _BitInt of shift vs ubsan pinskia at gcc dot gnu.org
2023-12-21 1:19 ` pinskia at gcc dot gnu.org
@ 2023-12-21 10:16 ` cvs-commit at gcc dot gnu.org
2023-12-21 10:31 ` jakub at gcc dot gnu.org
2023-12-21 10:42 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-12-21 10:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:0e7f5039c52a020c3ed5f18a2b3ee1fb42b78f62
commit r14-6778-g0e7f5039c52a020c3ed5f18a2b3ee1fb42b78f62
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Dec 21 11:14:55 2023 +0100
ubsan: Add workaround for missing bitint libubsan support for shifts
[PR113092]
libubsan still doesn't support bitints, so ubsan contains a workaround and
emits value 0 and TK_Unknown kind for those. If shift second operand has
the large/huge _BitInt type, this results in internal errors in libubsan
though, so the following patch provides a temporary workaround for that
- in the rare case where the last operand has _BitInt type wider than
__int128 (or long long on 32-bit arches), it will pretend the shift count
has that type saturated to its range. IMHO better than crashing in
the library. If the value fits into the __int128 (or long long) range,
it will be printed correctly (just print that it has __int128/long long
type rather than say _BitInt(255)), if it doesn't, user will at least
know that it is a very large negative or very large positive value.
2023-12-21 Jakub Jelinek <jakub@redhat.com>
PR sanitizer/113092
* c-ubsan.cc (ubsan_instrument_shift): Workaround for missing
ubsan _BitInt support for the shift count.
* gcc.dg/ubsan/bitint-4.c: New test.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug sanitizer/113092] _BitInt of shift vs ubsan
2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
` (2 preceding siblings ...)
2023-12-21 10:16 ` cvs-commit at gcc dot gnu.org
@ 2023-12-21 10:31 ` jakub at gcc dot gnu.org
2023-12-21 10:42 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-12-21 10:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Worked around for now (till libubsan has proper _BitInt support).
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug sanitizer/113092] _BitInt of shift vs ubsan
2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
` (3 preceding siblings ...)
2023-12-21 10:31 ` jakub at gcc dot gnu.org
@ 2023-12-21 10:42 ` jakub at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-12-21 10:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113092
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2023-12-20 12:06 [Bug sanitizer/113092] New: SanitizerTool: CHECK failed: ubsan_value.cpp:69 "((getType().isSignedIntegerTy())) != (0)" (0x0, 0x0) with _BitInt() zsojka at seznam dot cz
2023-12-21 1:16 ` [Bug sanitizer/113092] _BitInt of shift vs ubsan pinskia at gcc dot gnu.org
2023-12-21 1:19 ` pinskia at gcc dot gnu.org
2023-12-21 10:16 ` cvs-commit at gcc dot gnu.org
2023-12-21 10:31 ` jakub at gcc dot gnu.org
2023-12-21 10:42 ` jakub at gcc dot gnu.org
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