[Gluster-devel] Fwd: Re: libgfapi libvirt memory leak version 3.7.8

[Piotr Rybicki]

W dniu 2016-02-11 o 16:02, Piotr Rybicki pisze:
> Hi All
>
> I have to report, that there is a mem leak latest version of gluster
>
> gluster: 3.7.8
> libvirt 1.3.1
>
> mem leak exists when starting domain (virsh start DOMAIN) which acesses
> drivie via libgfapi (although leak is much smaller than with gluster
> 3.5.X).
>
> I believe libvirt itself uses libgfapi only to check existence of a disk
> (via libgfapi). Libvirt calls glfs_ini and glfs_fini when doing this check.
>
> When using drive via file (gluster fuse mount), there is no mem leak
> when starting domain.
>
> my drive definition (libgfapi):
>
>      <disk type='network' device='disk'>
>        <driver name='qemu' type='raw' cache='writethrough' iothread='1'/>
>        <source protocol='gluster' name='pool/disk-sys.img'>
>          <host name='X.X.X.X' transport='rdma'/> # connection is still
> via tcp. Defining 'tcp' here doesn't make any difference.
>        </source>
>        <blockio logical_block_size='512' physical_block_size='32768'/>
>        <target dev='vda' bus='virtio'/>
>        <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> function='0x0'/>
>      </disk>
>
> I've at first reported to libvirt developers, but they blame gluster.
>
> valgrind details (libgfapi):
>
> # valgrind --leak-check=full --show-reachable=yes
> --child-silent-after-fork=yes libvirtd --listen 2> libvirt-gfapi.log
>
> On the other console:
> virsh start DOMAIN
> ...wait...
> virsh shutdown DOMAIN
> ...wait and stop valgrind/libvirtd
>
> valgrind log:
>
> ==5767== LEAK SUMMARY:
> ==5767==    definitely lost: 19,666 bytes in 96 blocks
> ==5767==    indirectly lost: 21,194 bytes in 123 blocks
> ==5767==      possibly lost: 2,699,140 bytes in 68 blocks
> ==5767==    still reachable: 986,951 bytes in 15,038 blocks
> ==5767==         suppressed: 0 bytes in 0 blocks
> ==5767==
> ==5767== For counts of detected and suppressed errors, rerun with: -v
> ==5767== ERROR SUMMARY: 96 errors from 96 contexts (suppressed: 0 from 0)
>
> full log:
> http://195.191.233.1/libvirt-gfapi.log
> http://195.191.233.1/libvirt-gfapi.log.bz2
>
> Best regards
> Piotr Rybicki

Even simpler case to see memleak is to valgrind on:

qemu-img info gluster://SERVER_IP:0/pool/FILE.img

==6100== LEAK SUMMARY:
==6100==    definitely lost: 19,846 bytes in 98 blocks
==6100==    indirectly lost: 2,479,205 bytes in 182 blocks
==6100==      possibly lost: 240,600 bytes in 7 blocks
==6100==    still reachable: 3,271,130 bytes in 2,931 blocks
==6100==         suppressed: 0 bytes in 0 blocks

Best regards
Piotr Rybicki