The attached and rather innocuous looking code generates the subject error.
It is a simplified version of a much more complex test case (in which the
select type is entered within a loop and the error shows up at the second
iteration)
===========================================================================
[sfili...@localhost bug20]$ gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/local/gnu46/libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --prefix=/usr/local/gnu46
--enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.6.0 20100823 (experimental) (GCC)
[sfili...@localhost bug20]$ gfortran -o bug20 bug20.f90
[sfili...@localhost bug20]$ ./bug20
NV = 10
*** glibc detected *** ./bug20: double free or corruption (fasttop):
0x00000000018d8ae0 ***
======= Backtrace: =========
/lib64/libc.so.6[0x3381475676]
./bug20[0x400b53]
./bug20[0x400b91]
/lib64/libc.so.6(__libc_start_main+0xfd)[0x338141ec5d]
./bug20[0x4007a9]
======= Memory map: ========
00400000-00401000 r-xp 00000000 08:09 983344
/home/sfilippo/NUMERICAL/NewPSBLAS/GNUbugs/bug20/bug20
00601000-00602000 rw-p 00001000 08:09 983344
/home/sfilippo/NUMERICAL/NewPSBLAS/GNUbugs/bug20/bug20
018d8000-018f9000 rw-p 00000000 00:00 0 [heap]
3381000000-338101e000 r-xp 00000000 08:06 4964354
/lib64/ld-2.12.so
338121e000-338121f000 r--p 0001e000 08:06 4964354
/lib64/ld-2.12.so
338121f000-3381220000 rw-p 0001f000 08:06 4964354
/lib64/ld-2.12.so
3381220000-3381221000 rw-p 00000000 00:00 0
3381400000-3381575000 r-xp 00000000 08:06 4964358
/lib64/libc-2.12.so
3381575000-3381775000 ---p 00175000 08:06 4964358
/lib64/libc-2.12.so
3381775000-3381779000 r--p 00175000 08:06 4964358
/lib64/libc-2.12.so
3381779000-338177a000 rw-p 00179000 08:06 4964358
/lib64/libc-2.12.so
338177a000-338177f000 rw-p 00000000 00:00 0
3381800000-3381883000 r-xp 00000000 08:06 4964404
/lib64/libm-2.12.so
3381883000-3381a82000 ---p 00083000 08:06 4964404
/lib64/libm-2.12.so
3381a82000-3381a83000 r--p 00082000 08:06 4964404
/lib64/libm-2.12.so
3381a83000-3381a84000 rw-p 00083000 08:06 4964404
/lib64/libm-2.12.so
3382c00000-3382cf1000 r-xp 00000000 08:06 5092887
/usr/lib64/libgfortran.so.3.0.0
3382cf1000-3382ef1000 ---p 000f1000 08:06 5092887
/usr/lib64/libgfortran.so.3.0.0
3382ef1000-3382ef3000 rw-p 000f1000 08:06 5092887
/usr/lib64/libgfortran.so.3.0.0
3382ef3000-3382ef4000 rw-p 00000000 00:00 0
3385000000-3385016000 r-xp 00000000 08:06 4964412
/lib64/libgcc_s-4.4.4-20100630.so.1
3385016000-3385215000 ---p 00016000 08:06 4964412
/lib64/libgcc_s-4.4.4-20100630.so.1
3385215000-3385216000 rw-p 00015000 08:06 4964412
/lib64/libgcc_s-4.4.4-20100630.so.1
7f7a0b89c000-7f7a0b8a0000 rw-p 00000000 00:00 0
7f7a0b8d0000-7f7a0b8d1000 rw-p 00000000 00:00 0
7fffc443b000-7fffc4450000 rw-p 00000000 00:00 0
[stack]
7fffc4563000-7fffc4564000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vsyscall]
Abortito (core dumped)
--
Summary: [OOP] double free with SELECT TYPE
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sfilippone at uniroma2 dot it
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45384
