From: Anthony PERARD <anthony.perard@citrix.com>
Backtrace:
qemu_lockcnt_lock (lockcnt=0xb4) at ../util/lockcnt.c:238
aio_set_fd_handler (ctx=0x0, fd=51, is_external=true, io_read=0x0,
io_write=0x0, io_poll=0x0, io_poll_ready=0x0, opaque=0x0) at
../util/aio-posix.c:119
xen_device_unbind_event_channel (xendev=0x55c6da5b5000,
channel=0x55c6da6c4c80, errp=0x7fff641ac608) at ../hw/xen/xen-bus.c:926
xen_block_dataplane_stop (dataplane=0x55c6da6ddbe0) at
../hw/block/dataplane/xen-block.c:719
xen_block_disconnect (xendev=0x55c6da5b5000, errp=0x0) at
../hw/block/xen-block.c:48
xen_block_unrealize (xendev=0x55c6da5b5000) at ../hw/block/xen-block.c:154
xen_device_unrealize (dev=0x55c6da5b5000) at ../hw/xen/xen-bus.c:956
xen_device_exit (n=0x55c6da5b50d0, data=0x0) at ../hw/xen/xen-bus.c:985
notifier_list_notify (list=0x55c6d91f9820 <exit_notifiers>, data=0x0) at
../util/notify.c:39
qemu_run_exit_notifiers () at ../softmmu/runstate.c:760
Fixes: f6eac904f682 ("xen-block: implement BlockDevOps->drained_begin()")
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
--
CC: Stefan Hajnoczi <stefanha@redhat.com>
---
hw/xen/xen-bus.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index 1e08cf027a..ece8ec40cd 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -923,8 +923,10 @@ void xen_device_unbind_event_channel(XenDevice *xendev,
QLIST_REMOVE(channel, list);
- aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh),
- NULL, NULL, NULL, NULL, NULL);
+ if (channel->ctx) {
+ aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh),
+ NULL, NULL, NULL, NULL, NULL);
+ }
if (qemu_xen_evtchn_unbind(channel->xeh, channel->local_port) < 0) {
error_setg_errno(errp, errno, "xenevtchn_unbind failed");