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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libquadmath/99202] Undefined behaviour in libquadmath file
 rem_pio2q.c function __quadmath_rem_pio2q
Date: Tue, 23 Feb 2021 09:01:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99202

Martin Li=C5=A1ka <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.o=
rg,
                   |                            |marxin at gcc dot gnu.org
             Blocks|                            |63426

--- Comment #1 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Confirmed, full back-trace:

LD_PRELOAD=3D/dev/shm/objdir2/x86_64-pc-linux-gnu/libsanitizer/ubsan/.libs/=
libubsan.so.1.0.0
./a.out=20
/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+0x403e2=
d)
    #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+0x40174=
d)


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=3Dundefined=