[Bugs] [Bug 1246203] New: iobuf_unref errors killing logging ("again")

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1246203

            Bug ID: 1246203
           Summary: iobuf_unref errors killing logging ("again")
           Product: GlusterFS
           Version: 3.6.4
         Component: read-ahead
          Assignee: bugs at gluster.org
          Reporter: ueberall at projektzentrisch.de
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
After bringing up the two servers of a mirrored volume, a large number of the
below errors can be seen in the log during self-healing. (cf. bug #1116514)

[2015-07-23 16:40:02.832727] E [iobuf.c:759:iobuf_unref] (-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(_gf_log_callingfn+0x186)[0x7f707192dda6]
(-->
/usr/lib/x86_64-linux-gnu/glusterfs/3.6.4/xlator/performance/quick-read.so(qr_readv_cached+0x2a7)[0x7f7067579087]
(-->
/usr/lib/x86_64-linux-gnu/glusterfs/3.6.4/xlator/performance/quick-read.so(qr_readv+0x4a)[0x7f706757914a]
(-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(default_readv_resume+0x13f)[0x7f707193dd1f]
(-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(call_resume+0x5e4)[0x7f7071955e94]
))))) 0-iobuf: invalid argument: iobuf
[2015-07-23 16:40:02.833061] E [iobuf.c:865:iobref_unref] (-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(_gf_log_callingfn+0x186)[0x7f707192dda6]
(-->
/usr/lib/x86_64-linux-gnu/glusterfs/3.6.4/xlator/performance/quick-read.so(qr_readv_cached+0x2af)[0x7f706757908f]
(-->
/usr/lib/x86_64-linux-gnu/glusterfs/3.6.4/xlator/performance/quick-read.so(qr_readv+0x4a)[0x7f706757914a]
(-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(default_readv_resume+0x13f)[0x7f707193dd1f]
(-->
/usr/lib/x86_64-linux-gnu/libglusterfs.so.0(call_resume+0x5e4)[0x7f7071955e94]
))))) 0-iobuf: invalid argument: iobref


Version-Release number of selected component (if applicable):
v3.6.4 (on Ubuntu Linux 14.04.2 LTS) [NB packages in question needed to be
rebuilt locally with cherry-picked hotfix http://review.gluster.org/#/c/11650/
due to SSL-related errors]

How reproducible:
Just by bringing up both servers (always during self-healing process)

Steps to Reproduce:
1. reboot the hosts involved

Actual results:
Errors pointing to invalid arguments

Expected results:
No such errors

Additional info:
glusertd/glusterfsd processes die rather frequently.

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