[Bug malloc/17581] New: malloc_usable_size: expected 7 but got 11

[Bug malloc/17581] New: malloc_usable_size: expected 7 but got 11

[jim at lemke dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

            Bug ID: 17581
           Summary: malloc_usable_size: expected 7 but got 11
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: jim at lemke dot org

glibc testing sometimes generates this failure:
   FAIL: malloc/tst-malloc-usable.out
   malloc_usable_size: expected 7 but got 11

I have seen the problem in 2.17 and later.

The problem is in the malloc checking code.
malloc/hooks.c: __malloc_check_init(), mem2mem_check(), mem2chunk_check()

I have submitted a fix to the libc-alpha list.

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, master has been updated
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      from  a8a7d7d212de1dd8c8d0a59eb9ea1c9289f63be1 (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=08f1e1d2bca9ef087813357780ec0bafe71c7d29

commit 08f1e1d2bca9ef087813357780ec0bafe71c7d29
Author: James Lemke <jwlemke@codesourcery.com>
Date:   Wed Nov 26 13:45:24 2014 -0800

    Fix for test "malloc_usable_size: expected 7 but got 11"

    [BZ #17581] The checking chain of unused chunks was terminated by a hash of
    the block pointer, which was sometimes confused with the chunk length byte.
    The chain is now terminated by a NULL byte.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog      |    8 +++++
 NEWS           |    4 +-
 malloc/hooks.c |   79 +++++++++++++++++++++++++++++++------------------------
 3 files changed, 54 insertions(+), 37 deletions(-)

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[jim at lemke dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

James Lemke <jim at lemke dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from James Lemke <jim at lemke dot org> ---
The problem is fixed by the patch committed above.

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
That does not work.

$ MALLOC_CHECK_=3 iconv/iconvconfig --prefix=$PWD/root
*** Error in `iconv/iconvconfig': free(): invalid pointer: 0x09f15018 ***
======= Backtrace: =========
/suse/schwab/src/libc/i586/libc.so.6(+0x6cd73)[0xf7691d73]
/suse/schwab/src/libc/i586/libc.so.6(+0x72933)[0xf7697933]
/suse/schwab/src/libc/i586/libc.so.6(cfree+0x9b)[0xf769b31b]
/suse/schwab/src/libc/i586/libc.so.6(+0x2acea)[0xf764fcea]
/suse/schwab/src/libc/i586/libc.so.6(+0x23f35)[0xf7648f35]
/suse/schwab/src/libc/i586/libc.so.6(setlocale+0x2cf)[0xf76487af]
iconv/iconvconfig[0x8048dd5]
/suse/schwab/src/libc/i586/libc.so.6(__libc_start_main+0xf3)[0xf763e6f3]
iconv/iconvconfig[0x8049a96]
======= Memory map: ========
08048000-0804f000 r-xp 00000000 08:03 50072439                          
/daten/src/libc/i586/iconv/iconvconfig
0804f000-08050000 r--p 00006000 08:03 50072439                          
/daten/src/libc/i586/iconv/iconvconfig
08050000-08051000 rw-p 00007000 08:03 50072439                          
/daten/src/libc/i586/iconv/iconvconfig
09f15000-09f36000 rw-p 00000000 00:00 0                                  [heap]
f75db000-f75f6000 r-xp 00000000 08:02 1319905                           
/lib/libgcc_s.so.1
f75f6000-f75f7000 r--p 0001a000 08:02 1319905                           
/lib/libgcc_s.so.1
f75f7000-f75f8000 rw-p 0001b000 08:02 1319905                           
/lib/libgcc_s.so.1
f7623000-f7625000 rw-p 00000000 00:00 0 
f7625000-f7787000 r-xp 00000000 08:03 49819422                          
/daten/src/libc/i586/libc.so
f7787000-f7789000 r--p 00161000 08:03 49819422                          
/daten/src/libc/i586/libc.so
f7789000-f778a000 rw-p 00163000 08:03 49819422                          
/daten/src/libc/i586/libc.so
f778a000-f778e000 rw-p 00000000 00:00 0 
f778e000-f778f000 r-xp 00000000 00:00 0                                  [vdso]
f778f000-f77af000 r-xp 00000000 08:03 50080584                          
/daten/src/libc/i586/elf/ld.so
f77af000-f77b0000 r--p 0001f000 08:03 50080584                          
/daten/src/libc/i586/elf/ld.so
f77b0000-f77b1000 rw-p 00020000 08:03 50080584                          
/daten/src/libc/i586/elf/ld.so
ff8e7000-ff909000 rw-p 00000000 00:00 0                                 
[stack]
Aborted

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
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The branch, master has been updated
       via  9173840b4dbcd1a76993f22fd9595f0ae30d5a42 (commit)
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9173840b4dbcd1a76993f22fd9595f0ae30d5a42

commit 9173840b4dbcd1a76993f22fd9595f0ae30d5a42
Author: James Lemke <jwlemke@codesourcery.com>
Date:   Thu Dec 11 16:38:15 2014 -0800

    Fix for test "malloc_usable_size: expected 7 but got 11"

    [BZ #17581] Revert this fix while investigating a problem.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog      |    8 +++++
 malloc/hooks.c |   79 ++++++++++++++++++++++++-------------------------------
 2 files changed, 43 insertions(+), 44 deletions(-)

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, master has been updated
       via  265cbed8e73b23e3b38ada6cc42482c53a216224 (commit)
      from  85bae5a160e288fa85eab8a5d1b0b227ab20798a (commit)

Those revisions listed above that are new to this repository have
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=265cbed8e73b23e3b38ada6cc42482c53a216224

commit 265cbed8e73b23e3b38ada6cc42482c53a216224
Author: James Lemke <jwlemke@codesourcery.com>
Date:   Tue May 19 12:10:26 2015 -0700

    Fix for test "malloc_usable_size: expected 7 but got 11"

    [BZ #17581] The checking chain of unused chunks was terminated by a hash of
        the block pointer, which was sometimes confused with the chunk length
byte.
        We now avoid using a length byte equal to the magic byte.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog      |    9 ++++++++
 NEWS           |   16 +++++++-------
 malloc/hooks.c |   62 ++++++++++++++++++++++++++++++++++---------------------
 3 files changed, 55 insertions(+), 32 deletions(-)

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[Bug malloc/17581] malloc_usable_size: expected 7 but got 11

[jim at lemke dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17581

James Lemke <jim at lemke dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from James Lemke <jim at lemke dot org> ---
Fixed by my commit today.

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