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In the scenario where vhost-user sets eventfd to -1, qemu_chr_fe_get_msgfds retrieves fd as -1. When vhost_user_read receives, it does not perform blocking operations on the descriptor with fd=-1, so non-blocking operations should not be performed here either.This is a normal use case. Calling g_unix_set_fd_nonblocking at this point will cause the test to interrupt. When vhost_user_write sets the call fd to -1, it sets the number of fds to 0, so the fds obtained by qemu_chr_fe_get_msgfds will also be 0. Signed-off-by: Yuxue Liu <yuxue.liu@jaguarmicro.com> Message-Id: <20240411073555.1357-1-yuxue.liu@jaguarmicro.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>