The save helper message reader does operates with the fd in blocking
mode. So spurious wakeups could cause it to block, unless it takes
precautions.
Reported-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Signed-off-by: Ian Jackson <ian.jack...@eu.citrix.com>
---
tools/libxl/libxl_save_callout.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/libxl/libxl_save_callout.c b/tools/libxl/libxl_save_callout.c
index 40b25e4..0f392ef 100644
--- a/tools/libxl/libxl_save_callout.c
+++ b/tools/libxl/libxl_save_callout.c
@@ -265,6 +265,8 @@ static void helper_stdout_readable(libxl__egc *egc,
libxl__ev_fd *ev,
STATE_AO_GC(shs->ao);
int rc, errnoval;
+ revents = libxl__ev_fd_recheck(egc, ev);
+
if (revents & (POLLERR|POLLPRI)) {
LOG(ERROR, "%s signaled POLLERR|POLLPRI (%#x)",
shs->stdout_what, revents);
--
1.7.10.4
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