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* [Bug libquadmath/99202] New: Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q
@ 2021-02-22 15:55 zeccav at gmail dot com
2021-02-23 9:01 ` [Bug libquadmath/99202] " marxin at gcc dot gnu.org
2021-02-23 16:12 ` zeccav at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: zeccav at gmail dot com @ 2021-02-22 15:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99202
Bug ID: 99202
Summary: Undefined behaviour in libquadmath file rem_pio2q.c
function __quadmath_rem_pio2q
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libquadmath
Assignee: unassigned at gcc dot gnu.org
Reporter: zeccav at gmail dot com
Target Milestone: ---
! from dec_math.f90
! must be compiled and run
! gfortran compiler needs not be sanitized
! must load sanitized libquadmath.so.0 as in ldd a.out -> libquadmath.so.0 =>
/home/vitti/local/gcc-150221-undefined/lib64/libquadmath.so.0
! ../../../gcc-150221/libquadmath/math/rem_pio2q.c:562:26: runtime error: left
shift of 4612846647631955497 by 23 places cannot be represented in type 'long
int'
! rem_pio2q.c:562 -> "tx [2] = (double)(((ix << 23) | (lx >> 41)) & 0xffffff);"
real(16) :: q_i1, q_oa
q_i1 = 34.3774677078493908766176900826395_16
q_oa = cotan (q_i1)
end
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libquadmath/99202] Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q
2021-02-22 15:55 [Bug libquadmath/99202] New: Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q zeccav at gmail dot com
@ 2021-02-23 9:01 ` marxin at gcc dot gnu.org
2021-02-23 16:12 ` zeccav at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-02-23 9:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99202
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-02-23
CC| |fxcoudert at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Blocks| |63426
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, full back-trace:
LD_PRELOAD=/dev/shm/objdir2/x86_64-pc-linux-gnu/libsanitizer/ubsan/.libs/libubsan.so.1.0.0
./a.out
/home/marxin/Programming/gcc2/libquadmath/math/rem_pio2q.c:562:26: runtime
error: left shift of 4612832830761346066 by 23 places cannot be represented in
type 'long int'
#0 0x7ffff7193736 in __quadmath_rem_pio2q
/home/marxin/Programming/gcc2/libquadmath/math/rem_pio2q.c:562
#1 0x7ffff71adfde in tanq
/home/marxin/Programming/gcc2/libquadmath/math/tanq.c:73
#2 0x403e2d in MAIN__ (/home/marxin/Programming/testcases/a.out+0x403e2d)
#3 0x404e50 in main (/home/marxin/Programming/testcases/a.out+0x404e50)
#4 0x7ffff6fc9b24 in __libc_start_main (/lib64/libc.so.6+0x27b24)
#5 0x40174d in _start (/home/marxin/Programming/testcases/a.out+0x40174d)
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=undefined
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libquadmath/99202] Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q
2021-02-22 15:55 [Bug libquadmath/99202] New: Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q zeccav at gmail dot com
2021-02-23 9:01 ` [Bug libquadmath/99202] " marxin at gcc dot gnu.org
@ 2021-02-23 16:12 ` zeccav at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: zeccav at gmail dot com @ 2021-02-23 16:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99202
--- Comment #2 from Vittorio Zecca <zeccav at gmail dot com> ---
I believe you need LD_PRELOAD if the object program uses the address sanitizer.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-02-23 16:12 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-02-22 15:55 [Bug libquadmath/99202] New: Undefined behaviour in libquadmath file rem_pio2q.c function __quadmath_rem_pio2q zeccav at gmail dot com
2021-02-23 9:01 ` [Bug libquadmath/99202] " marxin at gcc dot gnu.org
2021-02-23 16:12 ` zeccav at gmail dot com
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