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Subjectnet: Hung task when closing device
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Hi all,

I've stumbled on the backtrace at the bottom when running the trinity fuzzer in a KVM guest on the latest linux-next build.

It reminds me a lot of https://lkml.org/lkml/2012/1/14/45 where the problem was a held mutex when leaving to userspace to deal with call_usermodehelper_exec().

[ 241.448189] INFO: task kworker/u:2:3577 blocked for more than 120 seconds.
[ 241.449837] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 241.452037] kworker/u:2 D 0000000000000000 4280 3577 2 0x00000000
[ 241.454055] ffff88002d599810 0000000000000082 5482a487f047e242 ffff88002d599fd8
[ 241.456210] 00000000001d4340 ffff88002d598000 00000000001d4340 00000000001d4340
[ 241.457907] 00000000001d4340 00000000001d4340 ffff88002d599fd8 00000000001d4340
[ 241.459056] Call Trace:
[ 241.459424] [<ffffffff826ee324>] schedule+0x24/0x70
[ 241.460130] [<ffffffff826ec5d5>] schedule_timeout+0x245/0x2c0
[ 241.460994] [<ffffffff8111316e>] ? mark_held_locks+0x6e/0x130
[ 241.461890] [<ffffffff81115bcf>] ? __lock_release+0x8f/0x1d0
[ 241.462779] [<ffffffff826efaab>] ? _raw_spin_unlock_irq+0x2b/0x70
[ 241.463585] [<ffffffff810e42c1>] ? get_parent_ip+0x11/0x50
[ 241.464344] [<ffffffff826eeb10>] wait_for_common+0x120/0x170
[ 241.465108] [<ffffffff810e2bb0>] ? try_to_wake_up+0x250/0x250
[ 241.465798] [<ffffffff826eec08>] wait_for_completion+0x18/0x20
[ 241.466533] [<ffffffff810c9878>] call_usermodehelper_exec+0x228/0x230
[ 241.467372] [<ffffffff826eea34>] ? wait_for_common+0x44/0x170
[ 241.468111] [<ffffffff81875ebb>] kobject_uevent_env+0x61b/0x650
[ 241.468957] [<ffffffff810561a3>] ? sched_clock+0x13/0x20
[ 241.469852] [<ffffffff81875efb>] kobject_uevent+0xb/0x10
[ 241.470652] [<ffffffff81874c0a>] kobject_cleanup+0xca/0x1b0
[ 241.471426] [<ffffffff81874cfd>] kobject_release+0xd/0x10
[ 241.472140] [<ffffffff818746dc>] kobject_put+0x2c/0x60
[ 241.472819] [<ffffffff8223a968>] ? dev_mc_flush+0x38/0x50
[ 241.473524] [<ffffffff8224b06b>] net_rx_queue_update_kobjects+0xab/0xf0
[ 241.474426] [<ffffffff8224b207>] netdev_unregister_kobject+0x37/0x70
[ 241.475311] [<ffffffff82235ba6>] rollback_registered_many+0x186/0x250
[ 241.476139] [<ffffffff82235d74>] unregister_netdevice_many+0x14/0x60
[ 241.476935] [<ffffffff82235e75>] default_device_exit_batch+0xb5/0xe0
[ 241.477773] [<ffffffff82229213>] ops_exit_list.clone.0+0x53/0x60
[ 241.478562] [<ffffffff82229c00>] cleanup_net+0x100/0x1a0
[ 241.479244] [<ffffffff810ca327>] process_one_work+0x1c7/0x460
[ 241.479938] [<ffffffff810ca2c6>] ? process_one_work+0x166/0x460
[ 241.480740] [<ffffffff82229b00>] ? net_drop_ns+0x40/0x40
[ 241.481488] [<ffffffff810cb892>] worker_thread+0x162/0x340
[ 241.482216] [<ffffffff810cb730>] ? manage_workers.clone.13+0x130/0x130
[ 241.483040] [<ffffffff810d25be>] kthread+0xbe/0xd0
[ 241.483679] [<ffffffff826f26b4>] kernel_thread_helper+0x4/0x10
[ 241.484473] [<ffffffff810de328>] ? finish_task_switch+0x78/0x100
[ 241.485291] [<ffffffff826f0834>] ? retint_restore_args+0x13/0x13
[ 241.486058] [<ffffffff810d2500>] ? kthread_flush_work_fn+0x10/0x10
[ 241.486844] [<ffffffff826f26b0>] ? gs_change+0x13/0x13
[ 241.487535] 4 locks held by kworker/u:2/3577:
[ 241.488131] #0: (netns){.+.+.+}, at: [<ffffffff810ca2c6>] process_one_work+0x166/0x460
[ 241.489222] #1: (net_cleanup_work){+.+.+.}, at: [<ffffffff810ca2c6>] process_one_work+0x166/0x460
[ 241.490419] #2: (net_mutex){+.+.+.}, at: [<ffffffff82229b80>] cleanup_net+0x80/0x1a0
[ 241.491460] #3: (rtnl_mutex){+.+.+.}, at: [<ffffffff822439d2>] rtnl_lock+0x12/0x20
[ 241.492556] Kernel panic - not syncing: hung_task: blocked tasks
[ 241.493478] Rebooting in 1 seconds.

--

Sasha.



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