hello,
> ==32701== Conditional jump or move depends on uninitialised value(s)
> > ==32701== at 0x4FB3D9: fillin_rpath
> > (in /home/zhengda/Dropbox/research/read-test/rand-read)
> > ==32701== by 0x4FDBCB: _dl_init_paths
> > (in /home/zhengda/Dropbox/research/read-test/rand-read)
> > ==32701== by 0x4CCC58: _dl_non_dynamic_init
> > (in /home/zhengda/Dropbox/research/read-test/rand-read)
> > ==32701== by 0x4CD762: __libc_init_first
> > (in /home/zhengda/Dropbox/research/read-test/rand-read)
> > ==32701== by 0x47F795: (below main)
> > (in /home/zhengda/Dropbox/research/read-test/rand-read)
> > ==32701==
> The above error for example looks to somewhat match a suppression in
> glibc-2.3.supp
>
> It is however not clear what is the cause of all these errors
> not being suppressed.
> Note that usually, having more info such as Valgrind version,
> OS and distribution version, cpu etc might only help to guess
> what it is :).
>
Sorry, I forget.
I use valgrind-3.6.1,
ubuntu 11.04,
Xeon(R) CPU E5405
Linux 2.6.38.8
Other than the errors in the standard library, it also shows many errors in
my own program and I found the error messages are also very misleading.
==21746== Use of uninitialised value of size 8
==21746== at 0x40D168: rand_permute::rand_permute(long, int)
(workload.h:63)
==21746== by 0x410624:
global_rand_permute_workload::global_rand_permute_workload(long, int, long,
long) (workload.h:165)
==21746== by 0x40F3FD: main (rand-read.cc:475)
==21746==
The corresponding code is shown below. I don't understand which variable
isn't initialized?
54 class rand_permute
55 {
56 off_t *offset;
57 long num;
58
59 public:
60 rand_permute(long num, int stride) {
61 offset = (off_t *) valloc(num * sizeof(off_t));
62 for (int i = 0; i < num; i++) {
63 offset[i] = ((off_t) i) * stride;
64 }
65
66 for (int i = num - 1; i >= 1; i--) {
67 int j = random() % i;
68 off_t tmp = offset[j];
69 offset[j] = offset[i];
70 offset[i] = tmp;
71 }
72 }
Thanks,
Da
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