On Fri, Aug 28, 2020 at 5:40 PM Baptiste Covolato [off-list ref] wrote:

Hi David, Michael,

I am contacting you because I'm experiencing an issue that seems to be
awfully close to what David attempted to fix related to the tg3 driver
infinite sleep while holding rtnl_lock
(https://lkml.org/lkml/2020/6/15/1122).

David's remaining issue was tg3_reset_task() returning failure due to
some hardware error.  This would leave the driver in a limbo state
with netif_running() still true, but NAPI not enabled.  This can
easily lead to a soft lockup with rtnl held when it tries to disable
NAPI again.

I think the proper fix is to close the device when tg3_reset_task()
fails to bring it to a consistent state.  I haven't heard back from
David in a while, so I will propose a patch to do this in the next
day.

Let's see if this patch will also work for you.  Thanks.