tg3 fails to get link when kdump starts while using BCM5718

mapping eth0 to eth0
Saving to remote location root@192.168.110.23
lost connection
Attempting to enter user-space to capture vmcore

• The normal kernel always works.
• The problem doesn't happen when testing NetXtream BCM5709 NIC, which unfortunately uses bnx2 driver, instead of tg3. 
• Using a small static compiled application to set autoneg on after bring the interface UP to force a PHY reset didn't help.
• passing acpi=off didn't help.
• adding "link_delay 120" still fails 1 out of 5 tries.
  

       eth0 Link Up.  Waiting 120 Seconds
      Continuing
      Saving to remote location root@XXX.XXX.XXX.XXX
      lost connection
      ...
  
      Shutting down interface eth0:  tg3: eth0: Link is up at 1000 Mbps,
      full duplex.
      tg3: eth0: Flow control is on for TX and on for RX
  

• If the interface used by kdump is NOT brought UP in the normal kernel, then it works 100% of the attempts.
• Looping doing ifup eth0; ifdown eth0; in the normal kernel always get a link established.