Kernel panic with Fedora 21 (Linux 3.19 kernel) and e1000 driver

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What steps will reproduce the problem?
1. Install Fedora 21 in Virtualbox VM
2. Checkout branch 'next' from Git repo
   - Needed so modified drivers will compile
3. Build kernel module and e1000 driver
4. Remove existing e1000 driver, load kernel module, load netmap e1000 driver
5. ./bridge -v -i netmap:eth1
6. Wait 15-60 seconds (on average)
7. Observe kernel panic

What is the expected output? What do you see instead?
Kernel panic indicating NULL pointer dereference 

What version of the product are you using? On what operating system?
Version=latest from Git branch 'next' (commit 
e895d351f08d3d6076f44341262d52eef65ffde8)
Operating System=Fedora 21
Linux kernel=3.19.3-200.fc21.x86_64

Please provide any additional information below.
Attached dmesg log.  Step #4 @ 276.517044.  Step #5 @ 299.449922

Original issue reported on code.google.com by bkamb...@i-a-i.com on 10 Apr 2015 at 8:39

Attachments:

• vmcore-dmesg.txt