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+++ This bug was initially created as a clone of Bug #1225171 +++
QEMU runs these from its threads, so blocking here causes the vcpu to lock up from the guest's perspective, resulting in messages in linux guests like
BUG: soft lockup - CPU#1 stuck for 520s!
One cause that has been observed is via Objecter-level throttling of requests:
With caching disabled, this blocks directly in aio_read/write().
With caching enabled, the cache does i/o while holding its lock, and if it is throttled in its flusher thread, for example, readx() and writex() will block waiting on the cache lock.
Scratch build with the patches for the issue:
https://brewweb.devel.redhat.com/taskinfo?taskID=9379871
-> setting devel_ack+.
@Jason: This bz is for base rhel-7.2, the patches are not (can't be, yet) submitted to base rhel, moving back to ASSIGNED.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2348.html