From acbbc036619092fcd2c882222e1be168bd972b3e Mon Sep 17 00:00:00 2001 From: Amit Shah Date: Tue, 16 Apr 2013 15:58:16 +0530 Subject: [PATCH] rng random backend: check for -EAGAIN errors on read Not handling EAGAIN triggers the assert qemu/backends/rng-random.c:44:entropy_available: assertion failed: (len != -1) Aborted (core dumped) This happens when starting a guest with '-device virtio-rng-pci', issuing a 'cat /dev/hwrng' in the guest, while also doing 'cat /dev/random' on the host. Reported-by: yunpingzheng Signed-off-by: Amit Shah Message-id: eacda84dfaf2d99cf6d250b678be4e4d6c2088fb.1366108096.git.amit.shah@redhat.com Signed-off-by: Anthony Liguori --- backends/rng-random.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/backends/rng-random.c b/backends/rng-random.c index d5761f2cce..830360c780 100644 --- a/backends/rng-random.c +++ b/backends/rng-random.c @@ -41,6 +41,9 @@ static void entropy_available(void *opaque) ssize_t len; len = read(s->fd, buffer, s->size); + if (len < 0 && errno == EAGAIN) { + return; + } g_assert(len != -1); s->receive_func(s->opaque, buffer, len);