zif critical errors

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zif

Every once in a while I get these errors when installing a package using zif:

Downloading        [==================================================================] (59%)
 packages/glusterfs-server-3.2.4-2.fc16.x86_64.rpm [2.9 MB/s] om 64 to 52 on 0x1fb60b0!
5) zif-main.c:2590 (5/6)
4) zif-main.c:2401 (3/5)
3) zif-transaction.c:3989 (1/3)
2) zif-package-array.c:243 (0/1)
1) zif-package-remote.c:416 (2/3)
0) zif-store-remote.c:505 (1/2)

(zif:18671): Zif-CRITICAL **: percentage should not go down from 60 to 19 on 0x78e6410!
4) zif-main.c:2590 (5/6)
3) zif-main.c:2401 (3/5)
2) zif-transaction.c:3989 (1/3)
1) zif-package-array.c:243 (0/1)
0) zif-package-remote.c:416 (2/3)

(zif:18671): Zif-CRITICAL **: percentage should not go down from 64 to 27 on 0x7f5f4c0!
3) zif-main.c:2590 (5/6)
2) zif-main.c:2401 (3/5)
1) zif-transaction.c:3989 (1/3)
0) zif-package-array.c:243 (0/1)

(zif:18671): Zif-CRITICAL **: percentage should not go down from 64 to 27 on 0x1fb63e0!
2) zif-main.c:2590 (5/6)
1) zif-main.c:2401 (3/5)
0) zif-transaction.c:3989 (1/3)

(zif:18671): Zif-CRITICAL **: percentage should not go down from 61 to 31 on 0x7909ae0!
1) zif-main.c:2590 (5/6)
0) zif-main.c:2401 (3/5)

(zif:18671): Zif-CRITICAL **: percentage should not go down from 49 to 40 on 0x1fb62d0!
0) zif-main.c:2590 (5/6)
Completed          [==================================================================] (100%)
                                                               m 59 to 52 on 0x1fb60b0!
Transaction success!

Although the packages get installed, this is makes me uncomfortable.

And how are these stack-traces generated for C code ?