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...r, Creating a new HVM domU fails with the following error: map shared IO page returned error 22 I've narrowed it down to qemu-dm which fails to start: # /usr/lib/xen-4.1/bin/qemu-dm [...] qemu_map_cache_init nr_buckets = 10000 size 4194304 errno0 = 2 domid = -1 shared page at pfn 0 errno1 = 3 errno2 = 22 map shared IO page returned error 22 I added some errno debug then rebuilt and reinstalled the package using apt-src, here is the diff: diff --git a/qemu/hw/xen_machine_fv.c b/qemu/hw/xen_machine_fv.c index a353ee6..fe7a914 100644 --- a/qemu/hw/xen_machine_fv.c +++ b/qemu/hw/xen_machine_fv.c...

...source file descriptor is closed, EMPTY if there are no unused - * file descriptors left. + * Copy a file descriptor to be >= to. Invokes sh_error on error. */ int @@ -383,13 +381,8 @@ copyfd(int from, int to) int newfd; newfd = fcntl(from, F_DUPFD, to); - if (newfd < 0) { - int errno2 = errno; - if (errno2 == EMFILE) - return EMPTY; - else - sh_error("%d: %s", from, strerror(errno2)); - } + if (newfd < 0) + sh_error("%d: %s", from, strerror(errno)); return newfd; } commit 2b4c87b04c00d0f9733d14ac1fabdc93e57109d1 Author: Herbert Xu <herbert...