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SubjectHang deconfiguring network interface (in shutdown) on 3.3-rc1
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It looks like it might be a tg3 or RCU issue.  When I shut down my
parisc SMP 4 way system, I get an immediate hang here

Deconfiguring network interfaces...Internet Systems Consortium DHCP
Client 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/eth0/00:30:6e:4b:15:59
Sending on LPF/eth0/00:30:6e:4b:15:59
Sending on Socket/fallback
DHCPRELEASE on eth0 to 153.66.140.171 port 67

Followed some seconds later by

[ 5714.268000] INFO: rcu_sched detected stall on CPU 3 (t=15000 jiffies)
[ 5714.268000] Backtrace:
[ 5714.268000] [<000000004011fdd4>] show_stack+0x14/0x20
[ 5714.268000] [<000000004011fdf8>] dump_stack+0x18/0x28
[ 5714.268000] [<00000000401c1fec>] __rcu_pending+0xcc/0x5c8
[ 5714.276000] [<00000000401c2d60>] rcu_check_callbacks+0x80/0xf8
[ 5714.276000] INFO: rcu_sched detected stalls on CPUs/tasks: { 3}
(detected by 2, t=15002 jiffies)
[ 5714.276000] Backtrace:
[ 5714.276000] [<000000004011fdd4>] show_stack+0x14/0x20
[ 5714.276000] [<000000004011fdf8>] dump_stack+0x18/0x28
[ 5714.276000] [<00000000401c2484>] __rcu_pending+0x564/0x5c8
[ 5714.276000] [<00000000401c2d60>] rcu_check_callbacks+0x80/0xf8
[ 5714.276000] [<0000000040155dc8>] update_process_times+0x68/0xd8
[ 5714.276000] [<0000000040121378>] timer_interrupt+0x1c0/0x220
[ 5714.276000] [<00000000401b9cfc>] handle_irq_event_percpu+0xa4/0x2a0
[ 5714.276000] [<00000000401be58c>] handle_percpu_irq+0x9c/0xd0
[ 5714.276000] [<00000000401b9500>] generic_handle_irq+0x48/0x60
[ 5714.276000] [<0000000040121a50>] do_cpu_irq_mask+0x1b8/0x2a8
[ 5714.276000] [<0000000040105074>] intr_return+0x0/0x4
[ 5714.276000] [<0000000040105074>] intr_return+0x0/0x4
[ 5714.276000] [<00000000401296dc>] cpu_idle+0x74/0x80
[ 5714.276000] [<000000004078e1d0>] smp_callin+0x150/0x1a0
[ 5714.276000]
[ 5714.348000] [<0000000040155dc8>] update_process_times+0x68/0xd8
[ 5714.348000] [<0000000040121378>] timer_interrupt+0x1c0/0x220
[ 5714.356000] [<00000000401b9cfc>] handle_irq_event_percpu+0xa4/0x2a0
[ 5714.364000] [<00000000401be58c>] handle_percpu_irq+0x9c/0xd0
[ 5714.364000] [<00000000401b9500>] generic_handle_irq+0x48/0x60
[ 5714.372000] [<0000000040121a50>] do_cpu_irq_mask+0x1b8/0x2a8
[ 5714.372000] [<0000000040105074>] intr_return+0x0/0x4
[ 5714.380000]

This didn't happen in 3.2

Sysrq still works and sysrq-T shows ifconfig stuck:


[ 6030.376000] ifconfig R running task 0 1470 1452
0x00000014
[ 6030.376000] Backtrace:
[ 6030.376000] [<000000004017c6c8>] scheduler_tick+0x180/0x1a0
[ 6030.376000] [<0000000040155e1c>] update_process_times+0xbc/0xd8
[ 6030.376000] [<0000000040121378>] timer_interrupt+0x1c0/0x220
[ 6030.376000] [<00000000401b9d54>] handle_irq_event_percpu+0xfc/0x2a0
[ 6030.376000] [<0000000040105074>] intr_return+0x0/0x4
[ 6030.376000] [<000000004011c638>] _raw_spin_lock_bh+0x30/0x40
[ 6030.376000] [<000000004011c620>] _raw_spin_lock_bh+0x18/0x40
[ 6030.376000] [<000000001c6e3a64>] tg3_chip_reset+0x9c4/0x1328 [tg3]
[ 6030.376000] [<000000001c6eca9c>] tg3_halt+0xdc/0x1d8 [tg3]
[ 6030.376000] [<000000001c6f9964>] tg3_close+0x194/0x3f0 [tg3]
[ 6030.376000] [<0000000040411518>] __dev_close_many+0x100/0x178
[ 6030.376000] [<0000000040415130>] __dev_close+0x30/0x50
[ 6030.376000] [<000000004040ebf8>] __dev_change_flags+0xb0/0x1d0
[ 6030.376000] [<00000000404113b0>] dev_change_flags+0x28/0x90
[ 6030.376000] [<0000000040488d70>] devinet_ioctl+0x748/0x898
[ 6030.376000] [<000000004048a5f4>] inet_ioctl+0x204/0x228

James




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