Testing valgrind in rawhide (separate valgrind-debuginfo package)

Jan Kratochvil jan.kratochvil at redhat.com
Thu Mar 7 08:42:19 UTC 2013


On Wed, 06 Mar 2013 16:13:47 +0100, Mark Wielaard wrote:
> On Wed, 2013-03-06 at 14:38 +0000, Richard W.M. Jones wrote:
[...]
> > ==11843== 56 bytes in 1 blocks are definitely lost in loss record 6 of 6
> > ==11843==    at 0x4A06409: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> > ==11843==    by 0x38EAC861F9: strdup (strdup.c:42)
> > ==11843==    by 0x38EC8097C9: setprocattrcon_raw.constprop.3 (procattr.c:241)
> > ==11843==    by 0x38EC8099B7: setprocattrcon.constprop.2 (procattr.c:274)
> > ==11843==    by 0x400955: main (in /tmp/test)
[...]
> It looks like you will have to use the setprocattrcon[.constprop]
> function name in your suppression file. I am not exactly sure how the
> linker ends up pointing directly to that one for setsockcreatecon (),
> but it apparently is. And so valgrind will only know it by that name.

Symbol table '.symtab' contains 770 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
    70: 0000000000009990    62 FUNC    LOCAL  DEFAULT   11 setprocattrcon.constprop.2

Contents of the .debug_info section:
 <1><62c6>: Abbrev Number: 58 (DW_TAG_subprogram)
    <62c7>   DW_AT_name        : (indirect string, offset: 0x3eb4): setprocattrcon
    <62d2>   DW_AT_inline      : 1      (inlined)
 <1><6791>: Abbrev Number: 40 (DW_TAG_subprogram)
    <6792>   DW_AT_abstract_origin: <0x62c6>
    <6794>   DW_AT_low_pc      : 0x9990
    <679c>   DW_AT_high_pc     : 62

Valgrind apparently used the ELF symbol name.  But in DWARF there is the real
function name (and it is even marked as 'inlined' - although it is a standalone
function).

GDB also knows the real name from DWARF:

(gdb) disas 'setprocattrcon.constprop.2'
Dump of assembler code for function setprocattrcon:
   0x0000000000009990 <+0>:	push   %rbx
[...]
   0x00000000000099cd <+61>:	retq   
End of assembler dump.

So it is possible to fix it in Valgrind.


Jan


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