vhost: Do not abort on log-start error

Commit 3688fec8923 ("memory: Add Error** argument to .log_global_start()
handler") enabled vhost_log_global_start() to return a proper error, but
did not change it to do so; instead, it still aborts the whole process
on error.

This crash can be reproduced by e.g. killing a virtiofsd daemon before
initiating migration.  In such a case, qemu should not crash, but just
make the attempted migration fail.

Buglink: https://issues.redhat.com/browse/RHEL-94534
Reported-by: Tingting Mao <timao@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20250724125928.61045-2-hreitz@redhat.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index c30ea1156e811af0fec1da8a1aac4177c9e0e4a5..05ad5de629b4763a30d671c7e473cef396dd6a48 100644 (file)
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1110,7 +1110,8 @@ static bool vhost_log_global_start(MemoryListener *listener, Error **errp)
 
     r = vhost_migration_log(listener, true);
     if (r < 0) {
-        abort();
+        error_setg_errno(errp, -r, "vhost: Failed to start logging");
+        return false;
     }
     return true;
 }