在 2017-09-23 05:12:20，"Tomoki Sekiyama" <tomoki.sekiy...@gmail.com> 写道： > > Thanks for your patch. > Which version of Windows have you found the hang? > > I tested on win08, win 08 r2 and win2012.
QGA versions: Use the latest qga-win from https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-qemu-ga/qemu-ga-win-7.4.5-1/ and stable branch from https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/virtio-win-0.1.126-2/virtio-win-0.1.126.iso All of them have the same behavior. How to reproduce: Copy a big file in guest (from d: to c:), then do fsfreeze when IO is in progress. At this time, we had a very chance to see that qga hang for a long time. Libvirt will not recieve a reply. qemu-ga service even don't answer `net stop` command. Regards, - Chen > Regards, > Tomoki > > > 2017-09-22 11:46 GMT+09:00 Chen Hanxiao <chen_han_x...@126.com>: > > From: Chen Hanxiao <chenhanx...@gmail.com> > > > > When VM is in a heavy IO, if the command "guest-fsfreeze-freeze" > > is executed, VSS may timeout when trying to hold writes. > > > > Inside guest, Event ID 12298(VSS_ERROR_HOLD_WRITES_TIMEOUT) > > is logged in the Event Viewer. > > > > At that time, if we call AbortBackup, qga may hang forever. > > > > This patch will solve this issues. > > > > Signed-off-by: Chen Hanxiao <chenhanx...@gmail.com> > > --- > > qga/vss-win32/requester.cpp | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/qga/vss-win32/requester.cpp b/qga/vss-win32/requester.cpp > > index 301762d..3d9c971 100644 > > --- a/qga/vss-win32/requester.cpp > > +++ b/qga/vss-win32/requester.cpp > > @@ -419,6 +419,16 @@ void requester_freeze(int *num_vols, ErrorSet *errset) > > break; > > } > > } > > + > > + if (wait_status == WAIT_TIMEOUT) { > > + err_set(errset, E_FAIL, > > + "timeout when try to receive Frozen event from VSS > provider"); > > + /* If we are here, VSS had timeout. > > + * Don't call AbortBackup, just return directly. > > + */ > > + goto out1; > > + } > > + > > if (wait_status != WAIT_OBJECT_0) { > > err_set(errset, E_FAIL, > > "couldn't receive Frozen event from VSS provider"); > > @@ -432,6 +442,8 @@ out: > > if (vss_ctx.pVssbc) { > > vss_ctx.pVssbc->AbortBackup(); > > } > > + > > +out1: > > requester_cleanup(); > > CoUninitialize(); > > }
