What version of tcmu-runner did you use? Was it one of the 1.4 or 1.5 releases or from the github master branch?
There was a bug in the older 1.4 release where due to a linux kernel initiator side change the behavior for an error code we used went from retrying for up to 5 minutes to 5 times. The 5 retries were then used in less than a second, so we could see the issue you are seeing.
I've done a git clone https://github.com/open-iscsi/tcmu-runner In version.h i see: #define TCMUR_VERSION "1.5.2" So I think I'm using the latest source available. *Simone Lazzaris* *Qcom S.p.A. a socio unico* simone.lazzaris@qcom.it[1] | www.qcom.it[2] * LinkedIn[3]* | *Facebook*[4] [5] -------- [1] mailto:simone.lazzaris@qcom.it [2] https://www.qcom.it [3] https://www.linkedin.com/company/qcom-spa [4] http://www.facebook.com/qcomspa [5] https://www.qcom.it/pdf/other/bannerfirmamail.gif