Hi,
I get the following race from DRD:
Conflicting store by thread 7 at 0x55fe8aa0 size 8
by 0x5CCD8750: func() (inv_utils.C:1711)
by 0x4C2C0C1: ??? (in /usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x5047F04: start_thread (in /lib64/libpthread-2.14.1.so)
by 0x5CB710C: clone (in /lib64/libc-2.14.1.so)
Address 0x55fe8aa0 is at offset 0 from 0x55fe8aa0. Allocation context:
at 0x4C2BC9D: malloc (in
/usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x5CCD849F: func() (inv_utils.C:1690)
by 0x4C2C0C1: ??? (in /usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x5047F04: start_thread (in /lib64/libpthread-2.14.1.so)
by 0x5CB710C: clone (in /lib64/libc-2.14.1.so)
Other segment start (thread 6)
at 0x4C31712: pthread_spin_lock (in
/usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x22C031FD: hunc (bn_thread.C:43)
by 0x4C2C0C1: ??? (in /usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x5047F04: start_thread (in /lib64/libpthread-2.14.1.so)
by 0x5CB710C: clone (in /lib64/libc-2.14.1.so)
Other segment end (thread 6)
at 0x4C30EC2: pthread_spin_init (in
/usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x22C032AD: hunc (bn_thread.C:47)
by 0x4C2C0C1: ??? (in /usr/lib64/valgrind/vgpreload_drd-amd64-linux.so)
by 0x5047F04: start_thread (in /lib64/libpthread-2.14.1.so)
by 0x5CB710C: clone (in /lib64/libc-2.14.1.so)
The function func() is in essence:
{
int * data = malloc(100);
for (int i = 0; i != 100; ++i) {
data[i] = 0; <------- Line 1711
}
// Some small calculations
free(data);
}
So I wonder how there can be a data race for writting to data. The
memory has been just allocated and no other thread knows about it.
How can this happen?
Thanks
Christoph
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