We are seeing sporadic failures in the Fedora build system where dnf says it cannot download a package for the mock chroot, but really it did download it fine.
This issue is very sporadic, most of the time things are fine.
It seems to affect every arch.
It seems to happen on both Fedora 24 and Fedora 25 builders.
An example task:
DEBUG util.py:421: Downloading Packages:
DEBUG util.py:421: Error: Error downloading packages:
DEBUG util.py:421: Cannot download toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm: All mirrors were tried
DEBUG util.py:557: Child return code was: 1
On the builder, in the chroot, /var/log/dnf.librepo.log has for gcc:
15:16:58 lr_download: Target: toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm (-)
15:16:58 select_next_target: Selecting mirror for: toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm
15:16:58 prepare_next_transfer: URL: https://kojipkgs.fedoraproject.org//repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm
15:19:06 check_transfer_statuses: Transfer finished: toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm (Effective url: https://kojipkgs.fedoraproject.org//repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm)
15:19:06 check_finished_transfer_status: Serious error - Curl code (28): Timeout was reached for https://kojipkgs.fedoraproject.org//repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm [Operation too slow. Less than 1000 bytes/sec transferred the last 120 seconds]
15:19:06 check_transfer_statuses: Error during transfer: Curl error (28): Timeout was reached for https://kojipkgs.fedoraproject.org//repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm [Operation too slow. Less than 1000 bytes/sec transferred the last 120 seconds]
15:19:06 select_next_target: Selecting mirror for: toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm
15:19:06 lr_download: Error while downloading: Cannot download toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm: All mirrors were tried
kojipkgs.fedoraproject.org goes to a proxy that sends to a squid proxy.
That squid proxy has:
1484666759.892 001079 10.5.129.159 TCP_MEM_HIT/200 16798917 GET http://kojipkgs.fedoraproject.org/repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm - HIER_NONE/- application/x-rpm
1484667218.844 1000010 10.5.129.159 TCP_MISS_ABORTED/200 11223180 GET http://kojipkgs.fedoraproject.org/repos/f26-build/686094/aarch64/toplink/packages/gcc/6.3.1/1.fc26/aarch64/gcc-6.3.1-1.fc26.aarch64.rpm - HIER_NONE/- application/x-rpm
in its logs for this access.
Happy to try and gather more info or debugging.
So, it turns out the root of our problem here was squid operating in smp mode. Sometimes it would cause connections to hang.
That said, it might be nice if librepo could retry 'retries' amount. We have it set to 20, but it gave up after the one connection timeout.
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