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* [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran
@ 2021-02-22 9:21 zeccav at gmail dot com
2021-02-22 16:02 ` [Bug libfortran/99191] " dominiq at lps dot ens.fr
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: zeccav at gmail dot com @ 2021-02-22 9:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99191
Bug ID: 99191
Summary: sanitizer detects undefined behaviour in libgfortran
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: zeccav at gmail dot com
Target Milestone: ---
! from pr66311.f90
! must be compiled and run with sanitized libgfortran
!../../../gcc-150221/libgfortran/io/write.c:835:7: runtime error: negation of
0x80000000000000000000000000000000 cannot be represented in type '__int128';
cast to an unsigned type to negate this value to itself
!../../../gcc-150221/libgfortran/runtime/string.c:199:11: runtime error:
negation of 0x80000000000000000000000000000000 cannot be represented in type
'__int128'; cast to an unsigned type to negate this value to itself
use iso_fortran_env, only : ikinds => integer_kinds
integer, parameter :: k = ikinds(size(ikinds))
write(*,*) -huge(0_k)-1
end
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/99191] sanitizer detects undefined behaviour in libgfortran
2021-02-22 9:21 [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran zeccav at gmail dot com
@ 2021-02-22 16:02 ` dominiq at lps dot ens.fr
2021-02-23 8:52 ` marxin at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: dominiq at lps dot ens.fr @ 2021-02-22 16:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99191
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2021-02-22
Status|UNCONFIRMED |NEW
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/99191] sanitizer detects undefined behaviour in libgfortran
2021-02-22 9:21 [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran zeccav at gmail dot com
2021-02-22 16:02 ` [Bug libfortran/99191] " dominiq at lps dot ens.fr
@ 2021-02-23 8:52 ` marxin at gcc dot gnu.org
2021-12-25 13:04 ` fxcoudert at gcc dot gnu.org
2021-12-25 14:57 ` fxcoudert at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-02-23 8:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99191
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jb at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Good, I can confirm that. The code contains a comment about it:
if (n < 0)
{
negative = 1;
t = -n; /*must use unsigned to protect from overflow*/
}
Full back-trace:
/home/marxin/Programming/gcc2/libgfortran/io/write.c:835:7: runtime error:
negation of 0x80000000000000000000000000000000 cannot be represented in type
'__int128'; cast to an unsigned type to negate this value to itself
#0 0x7ffff7844eec in write_decimal
/home/marxin/Programming/gcc2/libgfortran/io/write.c:835
#1 0x7ffff7846d56 in write_integer
/home/marxin/Programming/gcc2/libgfortran/io/write.c:1369
#2 0x7ffff7849b34 in list_formatted_write_scalar
/home/marxin/Programming/gcc2/libgfortran/io/write.c:1894
#3 0x7ffff784a5eb in _gfortrani_list_formatted_write
/home/marxin/Programming/gcc2/libgfortran/io/write.c:1972
#4 0x7ffff7812440 in wrap_scalar_transfer
/home/marxin/Programming/gcc2/libgfortran/io/transfer.c:2382
#5 0x7ffff7812487 in _gfortran_transfer_integer
/home/marxin/Programming/gcc2/libgfortran/io/transfer.c:2393
#6 0x7ffff78124b7 in _gfortran_transfer_integer_write
/home/marxin/Programming/gcc2/libgfortran/io/transfer.c:2399
#7 0x400873 in check.0 (/home/marxin/Programming/testcases/a.out+0x400873)
#8 0x4008b0 in MAIN__ (/home/marxin/Programming/testcases/a.out+0x4008b0)
#9 0x4008e7 in main (/home/marxin/Programming/testcases/a.out+0x4008e7)
#10 0x7ffff54edb24 in __libc_start_main (/lib64/libc.so.6+0x27b24)
#11 0x40072d in _start (/home/marxin/Programming/testcases/a.out+0x40072d)
@Janne: Can you please take a look?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/99191] sanitizer detects undefined behaviour in libgfortran
2021-02-22 9:21 [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran zeccav at gmail dot com
2021-02-22 16:02 ` [Bug libfortran/99191] " dominiq at lps dot ens.fr
2021-02-23 8:52 ` marxin at gcc dot gnu.org
@ 2021-12-25 13:04 ` fxcoudert at gcc dot gnu.org
2021-12-25 14:57 ` fxcoudert at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu.org @ 2021-12-25 13:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99191
Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fxcoudert at gcc dot gnu.org
--- Comment #2 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
Will be fixed by patch at
https://gcc.gnu.org/pipermail/fortran/2021-December/057218.html
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libfortran/99191] sanitizer detects undefined behaviour in libgfortran
2021-02-22 9:21 [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran zeccav at gmail dot com
` (2 preceding siblings ...)
2021-12-25 13:04 ` fxcoudert at gcc dot gnu.org
@ 2021-12-25 14:57 ` fxcoudert at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: fxcoudert at gcc dot gnu.org @ 2021-12-25 14:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99191
Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.0
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-12-25 14:57 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2021-02-22 9:21 [Bug libfortran/99191] New: sanitizer detects undefined behaviour in libgfortran zeccav at gmail dot com
2021-02-22 16:02 ` [Bug libfortran/99191] " dominiq at lps dot ens.fr
2021-02-23 8:52 ` marxin at gcc dot gnu.org
2021-12-25 13:04 ` fxcoudert at gcc dot gnu.org
2021-12-25 14:57 ` fxcoudert at gcc dot gnu.org
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