[Bug libstdc++/70982] New: experimental/filesystem/iterators/directory_iterator.cc etc. FAIL with --enable-vtable-verify

["ro at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70982

            Bug ID: 70982
           Summary: experimental/filesystem/iterators/directory_iterator.c
                    c etc. FAIL with --enable-vtable-verify
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
              Host: i386-pc-solaris2.12, x86_64-pc-linux-gnu
            Target: i386-pc-solaris2.12, x86_64-pc-linux-gnu
             Build: i386-pc-solaris2.12, x86_64-pc-linux-gnu

With --enable-vtable-verify, two libstdc++ testcases FAIL on Solaris 12/x86 and
Linux/x86_64:

FAIL: experimental/filesystem/iterators/directory_iterator.cc execution test

VTV: PID=19218 PPID=27468 Looking for vtable 8097254 in set fdfdded4.
VTV: PID=19218 PPID=27468 *** Unable to verify vtable pointer (8097254) in set
(fdfdded4) *** 
VTV: PID=19218 PPID=27468   Backtrace: 
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libvtv/.libs/libvtv.so.0.0.0'_Z30__vtv_log_verification_failurePKcb+0x56
[0xfdf86f06]
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libvtv/.libs/libvtv.so.0.0.0'_Z17__vtv_verify_failPPvPKv+0x8c
[0xfdf869fc]
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libvtv/.libs/libvtv.so.0.0.0'_Z24__VLTVerifyVtablePointerPPvPKv+0xbf
[0xfdf86c5f]
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libstdc++-v3/testsuite/normal4/directory_iterator.exe'_Z6test01v+0x3661
[0x8061681]
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libstdc++-v3/testsuite/normal4/directory_iterator.exe'main+0x16
[0x8061826]
/var/gcc/regression/trunk/12-gcc/build/i386-pc-solaris2.12/libstdc++-v3/testsuite/normal4/directory_iterator.exe'_start+0x46
[0x805cee6]
*** Unable to verify vtable pointer (8097254) in set (fdfdded4) *** 
Potential vtable pointer corruption detected!!

FAIL: experimental/filesystem/operations/copy.cc execution test

VTV: PID=31686 PPID=233690 Looking for vtable 0x614850 in set 0x7f03504acd40.
VTV: PID=31686 PPID=233690 *** Unable to verify vtable pointer (0x614850) in
set (0x7f03504acd40) ***
VTV: PID=31686 PPID=233690   Backtrace:
/var/gcc/regression/trunk/3.19.8-gcc-gas-gld/build/x86_64-pc-linux-gnu/libstdc++-v3/../libvtv/.libs/libvtv.so.0(_Z30__vtv_log_verification_failurePKcb+0x4a)[0x7f03508bbbda]
/var/gcc/regression/trunk/3.19.8-gcc-gas-gld/build/x86_64-pc-linux-gnu/libstdc++-v3/../libvtv/.libs/libvtv.so.0(_Z17__vtv_verify_failPPvPKv+0x89)[0x7f03508bb079]
/var/gcc/regression/trunk/3.19.8-gcc-gas-gld/build/x86_64-pc-linux-gnu/libstdc++-v3/../libvtv/.libs/libvtv.so.0(_Z24__VLTVerifyVtablePointerPPvPKv+0xa8)[0x7f03508bb2d8]
/var/gcc/regression/trunk/3.19.8-gcc-gas-gld/build/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs/libstdc++.so.6(_ZSt21__copy_streambufs_eofIcSt11char_traitsIcEElPSt15basic_streambufIT_T0_ES6_Rb+0x12e)[0x7f035058868e]
/var/gcc/regression/trunk/3.19.8-gcc-gas-gld/build/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs/libstdc++.so.6(_ZNSolsEPSt15basic_streambufIcSt11char_traitsIcEE+0x4f)[0x7f03505f1edf]
./copy.exe[0x40afd6]
./copy.exe[0x40b60a]
./copy.exe[0x40b845]
./copy.exe[0x406f8e]
./copy.exe[0x402ff3]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x3589a21d65]
./copy.exe[0x403dc5]
*** Unable to verify vtable pointer (0x614850) in set (0x7f03504acd40) ***

The second failure is currently hidden on Solaris 12 due to PR libstdc++/70975.

  Rainer