Erik Huelsmann wrote:
Hi Roman,
On Mon, Feb 16, 2026, 19:32 Roman Bogorodskiy <bogorodskiy@gmail.com> wrote:
Erik Huelsmann wrote:
Before this change, buffers returned from virFDStreamRead() would alternate in size (262120 and 24), because it only consumed the bytes remaining from the current background thread message.
As the background thread reads 262144 bytes (256kB) of data in each chunk, where the maximum size returned from virFDStreamRead() to be transferred over the remote protocol is only 262120, 24 bytes would be left in the buffer on each iteration. The next iteration leaves 24 bytes, which used to be returned without considering messages waiting in the queue.
Signed-off-by: Erik Huelsmann <ehuels@gmail.com> --- src/util/virfdstream.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-)
Hi,
I noticed that with this change libvirt-tck tests started failing for me on FreeBSD:
../scripts/storage/400-vol-download.t ../scripts/storage/405-vol-download-all.t ../scripts/storage/410-vol-download-nonblock.t
Things get back to normal when I revert this commit.
The only thing I see in the log is:
2026-02-16 18:04:27.505+0000: 75802027180048: error : virFDStreamRead:921 : stream is not open: Bad file descriptor
I see these are Perl scripts. Can you run the tests in verboden mode? ("prove --verbose") That should provide an indication of the point in the test where the error occurs
./scripts/storage/400-vol-download.t:108: my $rv = $st->recv($data, $nbytes); /usr/local/lib/perl5/site_perl/mach/5.42/Sys/Virt/Error.pm:52: my $self = shift; /usr/local/lib/perl5/site_perl/mach/5.42/Sys/Virt/Error.pm:54: return "libvirt error code: " . $self->{code} . ", message: " . $self->{message} . ($self->{message} =~ /\n$/ ? "" : "\n");
root@testrunner:~/libvirt-tck # PERL5LIB=./lib LIBVIRT_TCK_CONFIG=/etc/libvirt-tck/default.yml prove --verbose ./scripts/storage/400-vol-download.t ./scripts/storage/400-vol-download.t .. 1..16 # Defining transient storage pool ok 1 - define transient storage pool ok 2 - built storage pool ok 3 - started storage pool ok 4 - create raw volume ok 5 - started download libvirt error code: 38, message: stream is not open: Bad file descriptor # Looks like your test exited with 255 just after 5. By running it with '-d:Trace` it looks like it's failing on this specific line: https://gitlab.com/libvirt/libvirt-tck/-/blob/master/scripts/storage/400-vol... libvirt error code: 38, message: stream is not open: Bad file descriptor Also, looking at the trace, it's not the first iteration of the `while (1) {` loop.