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DescriptionBranislav Náter
2011-03-24 16:52:54 UTC
Description of problem:
Running ls -l within valgrind reports uninitialised values.
Version-Release number of selected component (if applicable):
coreutils-8.4-13.el6.x86_64
How reproducible:
always
Steps to Reproduce:
1. log to x86_64 machine
2. run "valgrind ls -l"
Actual results:
==8525== Memcheck, a memory error detector
==8525== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==8525== Using Valgrind-3.6.0 and LibVEX; rerun with -h for copyright info
==8525== Command: ls -l
==8525==
==8525== Conditional jump or move depends on uninitialised value(s)
==8525== at 0x52D7C9B: __GI___strcasecmp_l (in /lib64/libc-2.12.so)
==8525== by 0x5273E84: __gconv_open (in /lib64/libc-2.12.so)
==8525== by 0x5281417: _nl_find_msg (in /lib64/libc-2.12.so)
==8525== by 0x5281BE3: __dcigettext (in /lib64/libc-2.12.so)
==8525== by 0x409CA3: ??? (in /bin/ls)
==8525== by 0x5272C9C: (below main) (in /lib64/libc-2.12.so)
==8525==
==8525== Use of uninitialised value of size 8
==8525== at 0x52D9DD4: __GI___strcasecmp_l (in /lib64/libc-2.12.so)
==8525== by 0x5273E84: __gconv_open (in /lib64/libc-2.12.so)
==8525== by 0x5281417: _nl_find_msg (in /lib64/libc-2.12.so)
==8525== by 0x5281BE3: __dcigettext (in /lib64/libc-2.12.so)
==8525== by 0x409CA3: ??? (in /bin/ls)
==8525== by 0x5272C9C: (below main) (in /lib64/libc-2.12.so)
==8525==
==8525== Use of uninitialised value of size 8
==8525== at 0x52D9DD8: __GI___strcasecmp_l (in /lib64/libc-2.12.so)
==8525== by 0x5273E84: __gconv_open (in /lib64/libc-2.12.so)
==8525== by 0x5281417: _nl_find_msg (in /lib64/libc-2.12.so)
==8525== by 0x5281BE3: __dcigettext (in /lib64/libc-2.12.so)
==8525== by 0x409CA3: ??? (in /bin/ls)
==8525== by 0x5272C9C: (below main) (in /lib64/libc-2.12.so)
==8525==
total 0
==8525==
==8525== HEAP SUMMARY:
==8525== in use at exit: 19,312 bytes in 3 blocks
==8525== total heap usage: 137 allocs, 134 frees, 65,755 bytes allocated
==8525==
==8525== LEAK SUMMARY:
==8525== definitely lost: 0 bytes in 0 blocks
==8525== indirectly lost: 0 bytes in 0 blocks
==8525== possibly lost: 0 bytes in 0 blocks
==8525== still reachable: 19,312 bytes in 3 blocks
==8525== suppressed: 0 bytes in 0 blocks
==8525== Rerun with --leak-check=full to see details of leaked memory
==8525==
==8525== For counts of detected and suppressed errors, rerun with: -v
==8525== Use --track-origins=yes to see where uninitialised values come from
==8525== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 6 from 6)
Expected results:
no uninitialised values
Trace with enabled debuginfo - these uninitialized value(s) reports are only on x86_64 arch.
==17674== Conditional jump or move depends on uninitialised value(s)
==17674== at 0x3C7A285900: __GI___strcasecmp_l (strcmp.S:1998)
==17674== by 0x3C7A21FE24: __gconv_open (gconv_open.c:70)
==17674== by 0x3C7A22D3B7: _nl_find_msg (dcigettext.c:974)
==17674== by 0x3C7A22DB83: __dcigettext (dcigettext.c:640)
==17674== by 0x409CA3: main (ls.c:2063)
==17674== Uninitialised value was created by a stack allocation
==17674== at 0x3C7A21FD8F: __gconv_open (gconv_open.c:65)
==17674==
==17674== Use of uninitialised value of size 8
==17674== at 0x3C7A285D24: __GI___strcasecmp_l (strcmp.S:2257)
==17674== by 0x3C7A21FE24: __gconv_open (gconv_open.c:70)
==17674== by 0x3C7A22D3B7: _nl_find_msg (dcigettext.c:974)
==17674== by 0x3C7A22DB83: __dcigettext (dcigettext.c:640)
==17674== by 0x409CA3: main (ls.c:2063)
==17674== Uninitialised value was created by a stack allocation
==17674== at 0x3C7A21FD8F: __gconv_open (gconv_open.c:65)
==17674==
==17674== Use of uninitialised value of size 8
==17674== at 0x3C7A285D28: __GI___strcasecmp_l (strcmp.S:2258)
==17674== by 0x3C7A21FE24: __gconv_open (gconv_open.c:70)
==17674== by 0x3C7A22D3B7: _nl_find_msg (dcigettext.c:974)
==17674== by 0x3C7A22DB83: __dcigettext (dcigettext.c:640)
==17674== by 0x409CA3: main (ls.c:2063)
==17674== Uninitialised value was created by a stack allocation
==17674== at 0x3C7A21FD8F: __gconv_open (gconv_open.c:65)
==17674==
So - the problematic line is
char const *locale_format = dcgettext (NULL, long_time_format[i], LC_TIME);
long_time_format array is global variable and is defined ... LC_TIME is checked above ...
I think this is false positive caused by glibc optimalizations ... could be probably added to valgrind suppressions - if you are worried about this output.