On 02/05/18 08:01, Jean-Louis Dupond wrote:
We've got some "strange" issue on a Xen hypervisor with CentOS 6 and
4.9.63-29.el6.x86_6 kernel.
Hello Jean-Louis,
Since this behavior was observed with a distro kernel I think a support
request should be submitted to the vendor of that kernel. That vendor
will be able to tell you whether or not a fix is already available for
what looks like a hang in the iSCSI initiator. A possible alternative is
that you install a recent upstream kernel on the system (e.g. v4.15.3),
reproduce the issue and provide a dump of the information under
/sys/kernel/debug/block. Recent kernels namely make detailed information
available under /sys/kernel/debug/block for blk-mq drivers about which
requests are in progress. That information will allow to figure out in
which block driver a request got stuck.
Thanks,
Bart.
