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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/65904] New: Memory corruption with acc_shutdown, nvptx offloading, libgomp.oacc-c-c++-common/asyncwait-1.c
Date: Mon, 27 Apr 2015 14:19:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libgomp
X-Bugzilla-Version: unknown
X-Bugzilla-Keywords: openacc
X-Bugzilla-Severity: normal
X-Bugzilla-Who: tschwinge at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: jules at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65904

            Bug ID: 65904
           Summary: Memory corruption with acc_shutdown, nvptx offloading,
                    libgomp.oacc-c-c++-common/asyncwait-1.c
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: openacc
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: jules at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

Seems to have appeared with the "recent" libgomp changes (r221878, r221922).

    *** glibc detected *** ./asyncwait-1.exe: double free or corruption
(!prev): 0x0000000001cfdcf0 ***
    ======= Backtrace: =========
    /lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x2ac3b574bb96]
   
[...]/build-gcc/x86_64-unknown-linux-gnu/./libgomp/.libs/libgomp.so.1(+0x153dd)[0x2ac3b52a33dd]
   
[...]/build-gcc/x86_64-unknown-linux-gnu/./libgomp/.libs/libgomp.so.1(acc_shutdown+0x115)[0x2ac3b52a57a5]
    ./asyncwait-1.exe[0x40333d]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x2ac3b56ee76d]
    ./asyncwait-1.exe[0x400fb9]
    ======= Memory map: ========
    [...]

Valgrind reports:

    [...]
    ==24645== Invalid read of size 8
    ==24645==    at 0x60A53C8: gomp_free_memmap (target.c:914)
    ==24645==    by 0x60A77A4: acc_shutdown (oacc-init.c:229)
    ==24645==    by 0x402254: main (in [...]/asyncwait-1.exe)
    ==24645==  Address 0xda94f78 is 88 bytes inside a block of size 1,512
free'd
    ==24645==    at 0x4C2A739: free (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
    ==24645==    by 0x60A53DC: gomp_free_memmap (target.c:917)
    ==24645==    by 0x60A77A4: acc_shutdown (oacc-init.c:229)
    ==24645==    by 0x402254: main (in [...]/asyncwait-1.exe)
    [...]