Stephen Hemminger wrote:
Ben found this but the problem seems pretty widespread.
The following places are subject to deadlock between flush_scheduled_work
and the RTNL mutex. What can happen is that a work queue routine (like
bridge port_carrier_check) is waiting forever for RTNL, and the driver
routine has called flush_scheduled_work with RTNL held and is waiting
for the work queue to clear.
Several other places have comments like: "can't call flush_scheduled_work
here or it will deadlock". Most of the problem places are in device close
routine. My recommendation would be to add a check for device netif_running in
what ever work routine is used, and move the flush_scheduled_work to the
remove routine.
I seem to be able to trigger this within about 1 minute on a
particular 2.6.18.2 system with some 8139too devices, so if someone
has a patch that could be tested, I'll gladly test it. For
whatever reason, I haven't hit this problem on 2.6.20 yet, but
that could easily be dumb luck, and I haven't been running .20
very much.
To add to the list below, tg3 has this problem as well, as far as I
can tell by looking at the code.
Thanks,
Ben
8139too.c: rtl8139_close --> rtl8139_stop_thread
r8169.c: rtl8169_down
cassini.c: cas_change_mtu
iseries_veth.c: veth_stop_connection
s2io.c: s2io_close
sis190.c: sis190_down
--
Ben Greear <[EMAIL PROTECTED]>
Candela Technologies Inc http://www.candelatech.com
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