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SubjectRe: lockups with 2.4.20 (tg3? net/core/dev.c|deliver_to_old_ones)
Date
From
>> Since sometime in December two systems we have on site using P4 HT
(one
>> Dell 2650 and one Dell 4600, both dual CPU, both ht/mce capable) have
been
>> locking up without any kernel output and without sysrq keys working
(the
>> keyboard is locked solid).
>>[...]
>> Using nmi_watchdog I've managed to get a stack track and ran ksymoops
over
>> it (attached).


> Good report. To tell the truth, I know that this lockup exists,
> there's an RH issue-tracker item against me on this.

Several of us at HP have been chasing this problem as well. Here is why
there is a deadlock: deliver_to_old_ones()attempts to stop all timers
from running and then blocks until all the timers are no longer running.
This code is called from netif_receive_skb which is called from tg3_poll
while it is holding a lock in the tg3 driver. On another CPU, the
tg3_timer routine is run but is blocked by the lock held in the tg3_poll
routine. The tg3_timer routine never finishes because it can't acquire
the lock being held by tg3_poll on another CPU. That prevents
deliver_to_old_ones from executing because there is still a timer
routine executing.

Here is the call stack of the deadlocked CPUs on a RH8.0 system with a
2.4.18-24.8.0 smp kernel:
CPU 2:
deliver_to_old_ones+45
netif_receive_skb
tg3_rx+27b
tg3_poll+81
net_rx_action
do_softirq
do_IRQ
call_do_IRQ

CPU 6:
tg3_timer (tg3+9fc4)
run_timer_list+0x112
bh_action+55
tasklet_hi_action+67
do_softirq+d9
do_IRQ
call_do_IRQ+5

Thanks
Tom Rhodes
tom.rhodes@hp.com
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