netdev - Regression: youtube-dl hanging on download

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Date:   Sat, 25 Aug 2018 17:23:38 +0200
From:   Jan Janssen <medhefgo@....de>
To:     dsahern@...il.com
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org
Subject: Regression: youtube-dl hanging on download

Hi,

youtube-dl hangs trying to download videos from youtube. The commit below is 
my regression test result. Disabling ipv6 indeed does fix this for me.

Jan

---

d4ead6b34b67fd711639324b6465a050bcb197d4 is the first bad commit
commit d4ead6b34b67fd711639324b6465a050bcb197d4
Author: David Ahern <dsahern@...il.com>
Date:   Tue Apr 17 17:33:16 2018 -0700

    net/ipv6: move metrics from dst to rt6_info
    
    Similar to IPv4, add fib metrics to the fib struct, which at the moment
    is rt6_info. Will be moved to fib6_info in a later patch. Copy metrics
    into dst by reference using refcount.
    
    To make the transition:
    - add dst_metrics to rt6_info. Default to dst_default_metrics if no
      metrics are passed during route add. No need for a separate pmtu
      entry; it can reference the MTU slot in fib6_metrics
    
    - ip6_convert_metrics allocates memory in the FIB entry and uses
      ip_metrics_convert to copy from netlink attribute to metrics entry
    
    - the convert metrics call is done in ip6_route_info_create simplifying
      the route add path
      + fib6_commit_metrics and fib6_copy_metrics and the temporary
        mx6_config are no longer needed
    
    - add fib6_metric_set helper to change the value of a metric in the
      fib entry since dst_metric_set can no longer be used
    
    - cow_metrics for IPv6 can drop to dst_cow_metrics_generic
    
    - rt6_dst_from_metrics_check is no longer needed
    
    - rt6_fill_node needs the FIB entry and dst as separate arguments to
      keep compatibility with existing output. Current dst address is
      renamed to dest.
      (to be consistent with IPv4 rt6_fill_node really should be split
      into 2 functions similar to fib_dump_info and rt_fill_info)
    
    - rt6_fill_node no longer needs the temporary metrics variable
    
    Signed-off-by: David Ahern <dsahern@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

:040000 040000 1256a75be6bb5b9f3ef5b38ff75cfd10aba1a856 
d6cc99cbefe99bb3a5c1b73b6dcccd8ec0816ec5 M      include
:040000 040000 36a3fa59bea55e68c88a4fe2d1ac653fa8a50705 
cdbd8a8aa4d8bc2e8abf6bdf18b30388a957183c M      net