netdev - [regression v4.11] 617f01211baf ("8139too: use napi_complete

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Date:   Fri, 7 Apr 2017 21:17:54 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [regression v4.11] 617f01211baf ("8139too: use napi_complete_done()")

Hi,

My old P3 laptop started to die on me in the middle of larger compile
jobs (using distcc) after v4.11-rc<something>. I bisected the problem
to 617f01211baf ("8139too: use napi_complete_done()").

Unfortunately I wasn't able to capture a full oops as the machine doesn't
have serial and ramoops failed me. I did get one partial oops on vgacon
which showed rtl8139_poll() being involved (EIP was around
_raw_spin_unlock_irqrestore() supposedly), so seems to agree with my
bisect result.

So maybe some kind of nasty thing going between the hard irq and
softirq? Perhaps UP related? I tried to stare at the locking around
rtl8139_poll() for a while but it looked mostly sane to me.

-- 
Ville Syrjälä
Intel OTC