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tap_ctl_read_message
2012 Mar 06
0
Livelock induced failure in blktap2.
...r. The exit of xl does, however, release the livelock which
causes the tapdisk2 to generate an error and terminate since it can''t
send the DETACH response to the xl process which is now gone.
The livelock period can be widened by increasing the timeout on the
select call in tap-ctl.ipc.c:tap_ctl_read_message(). Doing so allows
the impact of the lock to be noted with, for example, the inability to
run a ps command in a separate shell session. The ps, or any other
command hangs, until the select call times out in xl and the guest
instance terminates.
The problem is definitely linked to xl since a blo...