[Xen-devel] soft lockups of tapdisk2 process - xen 4.4, kernel 3.12.17

[Eugene Istomin <E.Istomin@xxxxxxx>]

Hello,

 

after updating from xen 4.3 to xen 4.4 we have strange soft lockups, here is log - https://gist.github.com/evis/10953677.

 

We already disabled c-states in BIOS, kernel (processor.max_cstate=1 intel_idle.max_cstate=0), dom0 (xenpm set-max-cstate 1). An easy step to reproduce in our environment - run 2 VMs with DRBD-backed disk.

 

 

What "blktap_run_deferred" in this trace mean and why dom0 needs to call "blktap_device_restart"?

 

force_evtchn_callback+0xe/0x10

blktap_device_restart+0xdf/0xf0 [blktap2]

blktap_run_deferred+0xd1/0xe0 [blktap2]

blktap_ring_ioctl+0x3a5/0x4d0 [blktap2]

 

Thanks.

 

---

Best regards,

Eugene Istomin

 

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