[Intel-wired-lan] Deadlock since commit 6faee3d4ee8b ("igb: Add lock to avoid data race")

[Corinna Vinschen]

Hi,


After patch 6faee3d4ee8b ("igb: Add lock to avoid data race"), we see
a deadlock scenario when trying to unload the igb module.

The reproducer is pretty simple:

  # echo 2 > /sys/class/net/ens5f2/device/sriov_numvfs
  # modprobe -r igb

The hang is quite thorough, I assume it's suffering a deadlock between
the rtnl_lock and the spinlock introduced by 6faee3d4ee8b.

Any chance you could have a look?


Thanks,
Corinna