Comment # 1 on bug 1209620 from Paulo Alcantara

Hi Rick,

Thanks for the report.

Could provide verbose logs and network traces from both working
(6.1.8-1) and non-working (6.2.6-1) kernels as follows

  # umount any existing shares
  modprobe dns_resolver
  modprobe cifs
  dmesg --clear
  echo 'module cifs +p' > /sys/kernel/debug/dynamic_debug/control
  echo 'file fs/cifs/* +p' > /sys/kernel/debug/dynamic_debug/control
  echo 1 > /proc/fs/cifs/cifsFYI
  echo 1 > /sys/module/dns_resolver/parameters/debug
  tcpdump -s 0 -w trace.pcap port 445 & pid=$!
  sleep 3
  mount -t cifs //169.254.8.252/NAS ~/Mount/NAS -o ...
  sleep 3
  kill $pid
  dmesg > trace.log
  echo '----------' >> trace.log
  cat /proc/fs/cifs/dfscache >> trace.log

and then send trace.log and trace.pcap files for both kernels.

Please, also share

  - full mount options
  - server type, version and configuration