bce(4) panics, 9.2rc1 [redux]

[Hiroki Sato]

[Added yougari@ and davidch@ to the To:/Cc: list]

 I confirmed that my issue reported on -current@ is due to the bxe(4)
 driver (BCM57711).  If it is disabled, shutdown works fine without
 NMI.

 Also, I received several reports about the same box that NMI occurred
 even on bge(4) (BCM5717) driver when probing during power-cycle test.
 The probability was about once per 30 power-cycles.  Once it
 occurred, an AC on/off cycle was required (resetting a system
 reproduced the NMI in the same timing).

Sean Bruno <sean_bruno at yahoo.com> wrote
  in <1375208841.1496.3.camel at localhost>:

se>
se>
se> > http://svnweb.freebsd.org/base?view=revision&revision=236216
se> >
se> >
se>
se>
se> Ok, confirmed after ~50 reboots.
se>
se> There is a timing problem in this revision that I don't fully
se> understand.  Adding printf's inside bce_reset() will cause the existing
se> code to succeed, and sometimes the existing code in this revision will
se> work (about 10% of the time).
se>
se> In the failure mode, the network interface, bce0, will not come up into
se> service *without* and network restart, after which it works fine.
se>
se> I suspect that we are missing a DELAY or UDELAY somewhere in the
se> restoral of the emac_status settings that needs to be implemented.
se>
se> Sean
se>
se> p.s. sorry for the late report as the commit is well over a year old.
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