[LU-279] Test failure on test suite sanity, subtest test_17k

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.1.0, Lustre 2.4.0
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Maloo

Description

This issue was created by maloo for Prakash Surya <[e-mail]>

This issue relates to the following test suite run: https://maloo.whamcloud.com/test_sets/899e29aa-76a6-11e0-a1b3-52540025f9af.

The sub-test test_17k failed with the following error:

rsync failed with xattrs enabled

Rsync is failing when xattrs are enable due to the lgetxattr function return inconsistent information about the xattr size.

According to lgetxattr's man page:

An empty buffer of size zero can be passed into these calls to return the current size of the named extended attribute

On success, a positive number is returned indicating the size of the extended attribute value

It doesn't seem like these statements are being upheld.

The behavior I am seeing is:

        // ... 

        // path is a pointer to a sting with the pathname to a directory
        // on a lustre filesystem

        ssize_t ret1 = lgetxattr(path, "lustre.lov", NULL, 0); // returns 96

        char *buf = (char *)malloc(ret1);
        ssize_t ret2 = lgetxattr(path, "lustre.lov", buf, ret1); // returns 56

        // Thus at this point ret1 equals 96 and ret2 equals 56
        // Shouldn't ret1 and ret2 be the same value??

        // ...

Shouldn't both invocations of lgetxattr return the same value?