Bug 719587

Summary: Kernel: system hungs when remove bonding module with arp monitor
Product: Red Hat Enterprise Linux 6 Reporter: Liang Zheng <lzheng>
Component: kernelAssignee: Andy Gospodarek <agospoda>
Status: CLOSED ERRATA QA Contact: Botu Sun <bosun>
Severity: high Docs Contact:
Priority: medium    
Version: 6.2CC: arozansk, bosun, kzhang, peterm
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel-2.6.32-188.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-12-06 13:49:19 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 728633    

Description Liang Zheng 2011-07-07 12:29:15 UTC 
Description of problem:
Run testing on two bonding with arp monitor,when remove the bonding module,the kernel hungs and cannot reboot.

Version-Release number of selected component (if applicable):
kernel 2.6.32-166.el6

How reproducible:
always

Steps to Reproduce:
My reproducerifconfig eth4 up
ifconfig eth5 up
ifconfig eth6 up
ifconfig eth7 up
sleep 10
modprobe bonding mode=1 arp_interval=1000 arp_ip_target=192.168.1.21 max_bonds=2
ifconfig bond0 192.168.1.10/24 up
ifconfig bond1 192.168.1.11/24 up
ifenslave bond0 eth4 eth5
ifenslave bond1 eth6 eth7
sleep 10
modprobe -r bonding


Actual results:
[root@hp-dl580g7-01 ~]# 
Broadcast message from root.eng.nay.redhat.com
	(/dev/pts/0) at 5:46 ...

The system is going down for reboot NOW!
INFO: task events/20:119 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
events/20     D 0000000000000014     0   119      2 0x00000000
 ffff8802366e7d80 0000000000000046 0000000000000000 0000000000000000
 0000000000000000 0000000000000000 0000000000000000 0000000000000000
 ffff8802366de6b8 ffff8802366e7fd8 000000000000f598 ffff8802366de6b8
Call Trace:
 [<ffffffff814dc84e>] __mutex_lock_slowpath+0x13e/0x180
 [<ffffffff8142ea60>] ? linkwatch_event+0x0/0x30
 [<ffffffff814dc6eb>] mutex_lock+0x2b/0x50
 [<ffffffff8142b985>] rtnl_lock+0x15/0x20
 [<ffffffff8142ea6e>] linkwatch_event+0xe/0x30
 [<ffffffff81088830>] worker_thread+0x170/0x2a0
 [<ffffffff8108e160>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff810886c0>] ? worker_thread+0x0/0x2a0
 [<ffffffff8108ddf6>] kthread+0x96/0xa0
 [<ffffffff8100c1ca>] child_rip+0xa/0x20
 [<ffffffff8108dd60>] ? kthread+0x0/0xa0
 [<ffffffff8100c1c0>] ? child_rip+0x0/0x20
INFO: task ntpd:2650 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
ntpd          D 0000000000000006     0  2650      1 0x00000080
 ffff880235331cc8 0000000000000086 ffff880235331c68 ffffffff8105f0c4
 0000000000000000 ffff8802366b75b8 ffff880247415f80 ffff8802366b7580
 ffff880234aa5078 ffff880235331fd8 000000000000f598 ffff880234aa5078
Call Trace:
 [<ffffffff8105f0c4>] ? check_preempt_wakeup+0x1b4/0x290
 [<ffffffff814dc84e>] __mutex_lock_slowpath+0x13e/0x180
 [<ffffffff814dc6eb>] mutex_lock+0x2b/0x50
 [<ffffffff8142b985>] rtnl_lock+0x15/0x20
 [<ffffffff81421665>] dev_ioctl+0x125/0x5d0
 [<ffffffff8120e174>] ? inode_has_perm+0x54/0xa0
 [<ffffffff8115aaf5>] ? kmem_cache_alloc_notrace+0x115/0x130
 [<ffffffff8140b1dd>] sock_ioctl+0x9d/0x280
 [<ffffffff81184ee2>] vfs_ioctl+0x22/0xa0
 [<ffffffff81185084>] do_vfs_ioctl+0x84/0x580
 [<ffffffff81185601>] sys_ioctl+0x81/0xa0
 [<ffffffff8100b172>] system_call_fastpath+0x16/0x1b
INFO: task mingetty:2786 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mingetty      D 0000000000000004     0  2786      1 0x00000084
 ffff88023555f898 0000000000000046 0000000000000000 0000004000000002
 ffff88023555f8c8 ffffffff81165e58 0000000200012e60 000000010003bf25
 ffff880235327078 ffff88023555ffd8 000000000000f598 ffff880235327078
Call Trace:
 [<ffffffff81165e58>] ? __mem_cgroup_try_charge+0x78/0x420
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff811674c5>] ? mem_cgroup_charge_common+0xa5/0xd0
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107a17b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff8130960e>] ? tty_ldisc_deref+0xe/0x10
 [<ffffffff81300b20>] ? tty_read+0xb0/0xf0
 [<ffffffff81172f85>] ? vfs_read+0xb5/0x1a0
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task mingetty:2788 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mingetty      D 0000000000000002     0  2788      1 0x00000084
 ffff88043569f898 0000000000000046 0000000000000000 ffffffff00000002
 ffff88043569f8c8 ffffffff81165e58 ffff88043569f838 000000010003bf25
 ffff880433687af8 ffff88043569ffd8 000000000000f598 ffff880433687af8
Call Trace:
 [<ffffffff81165e58>] ? __mem_cgroup_try_charge+0x78/0x420
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff812628a9>] ? cpumask_next_and+0x29/0x50
 [<ffffffff810537e4>] ? find_busiest_group+0x244/0xb20
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107a17b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff8130960e>] ? tty_ldisc_deref+0xe/0x10
 [<ffffffff81300b20>] ? tty_read+0xb0/0xf0
 [<ffffffff81172f85>] ? vfs_read+0xb5/0x1a0
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task mingetty:2790 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mingetty      D 000000000000000e     0  2790      1 0x00000084
 ffff880235b69898 0000000000000046 0000000000000000 0000000000000002
 ffff880235b698c8 ffffffff81165e58 ffff880200000000 000000010003bf27
 ffff880235326638 ffff880235b69fd8 000000000000f598 ffff880235326638
Call Trace:
 [<ffffffff81165e58>] ? __mem_cgroup_try_charge+0x78/0x420
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff812628a9>] ? cpumask_next_and+0x29/0x50
 [<ffffffff81053f4a>] ? find_busiest_group+0x9aa/0xb20
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107a17b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff8130960e>] ? tty_ldisc_deref+0xe/0x10
 [<ffffffff81300b20>] ? tty_read+0xb0/0xf0
 [<ffffffff81172f85>] ? vfs_read+0xb5/0x1a0
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task mingetty:2792 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mingetty      D 0000000000000003     0  2792      1 0x00000084
 ffff880233181898 0000000000000046 0000000000000000 0000000000000002
 ffff8802331818c8 ffffffff81165e58 ffff880200000000 000000010003bf25
 ffff8802331286b8 ffff880233181fd8 000000000000f598 ffff8802331286b8
Call Trace:
 [<ffffffff81165e58>] ? __mem_cgroup_try_charge+0x78/0x420
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff811674c5>] ? mem_cgroup_charge_common+0xa5/0xd0
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107a17b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff8130960e>] ? tty_ldisc_deref+0xe/0x10
 [<ffffffff81300b20>] ? tty_read+0xb0/0xf0
 [<ffffffff81172f85>] ? vfs_read+0xb5/0x1a0
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task mingetty:2797 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mingetty      D 0000000000000014     0  2797      1 0x00000084
 ffff880234749898 0000000000000046 0000000000000000 0000000000000002
 ffff8802347498c8 ffffffff81165e58 ffff880200000000 000000010003bf39
 ffff880234801a78 ffff880234749fd8 000000000000f598 ffff880234801a78
Call Trace:
 [<ffffffff81165e58>] ? __mem_cgroup_try_charge+0x78/0x420
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff812628a9>] ? cpumask_next_and+0x29/0x50
 [<ffffffff810537e4>] ? find_busiest_group+0x244/0xb20
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107a17b>] ? try_to_del_timer_sync+0x7b/0xe0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff8130960e>] ? tty_ldisc_deref+0xe/0x10
 [<ffffffff81300b20>] ? tty_read+0xb0/0xf0
 [<ffffffff81172f85>] ? vfs_read+0xb5/0x1a0
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task bash:3120 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
bash          D 0000000000000002     0  3120      1 0x00000080
 ffff8802264dd898 0000000000000046 0000000000000000 0000000000012b40
 0000000040021b40 0000000000000000 ffff880236fdfd50 000000010003bf3f
 ffff8802265d3af8 ffff8802264ddfd8 000000000000f598 ffff8802265d3af8
Call Trace:
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff811da6b4>] ? free_proc_entry+0x74/0x90
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff810894b4>] flush_workqueue+0x54/0x80
 [<ffffffff810894f5>] flush_scheduled_work+0x15/0x20
 [<ffffffff813095ac>] tty_ldisc_release+0x3c/0x90
 [<ffffffff8130383b>] tty_release_dev+0x40b/0x5e0
 [<ffffffff8112eece>] ? __dec_zone_page_state+0x2e/0x30
 [<ffffffff81303a2e>] tty_release+0x1e/0x30
 [<ffffffff81173ff5>] __fput+0xf5/0x210
 [<ffffffff81174135>] fput+0x25/0x30
 [<ffffffff8116f6ad>] filp_close+0x5d/0x90
 [<ffffffff81069c8f>] put_files_struct+0x7f/0xf0
 [<ffffffff81069d53>] exit_files+0x53/0x70
 [<ffffffff8106bdc5>] do_exit+0x185/0x860
 [<ffffffff8107d94d>] ? __sigqueue_free+0x3d/0x50
 [<ffffffff8108126f>] ? __dequeue_signal+0xdf/0x1f0
 [<ffffffff8106c4f8>] do_group_exit+0x58/0xd0
 [<ffffffff81081946>] get_signal_to_deliver+0x1f6/0x460
 [<ffffffff8100a365>] do_signal+0x75/0x800
 [<ffffffff8107ffef>] ? kill_pid_info+0x3f/0x60
 [<ffffffff810d180b>] ? audit_syscall_exit+0x25b/0x290
 [<ffffffff8100ab80>] do_notify_resume+0x90/0xc0
 [<ffffffff8100b440>] int_signal+0x12/0x17
INFO: task bond1:18321 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
bond1         D 000000000000000e     0 18321      2 0x00000080
 ffff8802353c5d20 0000000000000046 0000000000000000 ffffffff81103c56
 ffff8802265d2b00 ffff880236ffaa80 ffff8802353c5d70 00000001000397b6
 ffff8802265d30b8 ffff8802353c5fd8 000000000000f598 ffff8802265d30b8
Call Trace:
 [<ffffffff81103c56>] ? __perf_event_task_sched_out+0x36/0x50
 [<ffffffff814dc84e>] __mutex_lock_slowpath+0x13e/0x180
 [<ffffffff814dc6eb>] mutex_lock+0x2b/0x50
 [<ffffffff8142b985>] rtnl_lock+0x15/0x20
 [<ffffffffa04af17f>] bond_activebackup_arp_mon+0x24f/0x7b0 [bonding]
 [<ffffffffa04aef30>] ? bond_activebackup_arp_mon+0x0/0x7b0 [bonding]
 [<ffffffff81088830>] worker_thread+0x170/0x2a0
 [<ffffffff8108e160>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff810886c0>] ? worker_thread+0x0/0x2a0
 [<ffffffff8108ddf6>] kthread+0x96/0xa0
 [<ffffffff8100c1ca>] child_rip+0xa/0x20
 [<ffffffff8108dd60>] ? kthread+0x0/0xa0
 [<ffffffff8100c1c0>] ? child_rip+0x0/0x20
INFO: task modprobe:18386 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
modprobe      D 0000000000000008     0 18386  18312 0x00000080
 ffff88041b1e3c28 0000000000000086 0000000000000000 ffff88041b1e3c18
 ffffffffa03b5e40 ffff880233379dc0 ffff88041b1e3c08 0000000100039845
 ffff880433d050b8 ffff88041b1e3fd8 000000000000f598 ffff880433d050b8
Call Trace:
 [<ffffffffa03b5e40>] ? fib6_ifdown+0x0/0x30 [ipv6]
 [<ffffffff814dc065>] schedule_timeout+0x215/0x2e0
 [<ffffffff814dbce3>] wait_for_common+0x123/0x180
 [<ffffffff8105dc60>] ? default_wake_function+0x0/0x20
 [<ffffffff814dbdfd>] wait_for_completion+0x1d/0x20
 [<ffffffff81088c01>] flush_cpu_workqueue+0x61/0x90
 [<ffffffff81088cb0>] ? wq_barrier_func+0x0/0x20
 [<ffffffff81088c58>] cleanup_workqueue_thread+0x28/0x80
 [<ffffffff81088d73>] destroy_workqueue+0x73/0xc0
 [<ffffffffa04acb8b>] bond_uninit+0x3b/0xe0 [bonding]
 [<ffffffff8141f66c>] rollback_registered+0x9c/0x130
 [<ffffffff8141f722>] unregister_netdevice+0x22/0x70
 [<ffffffffa04ad893>] bond_free_all+0x53/0xb0 [bonding]
 [<ffffffffa04b9d5d>] bonding_exit+0x35/0x3c [bonding]
 [<ffffffff810a9ad4>] sys_delete_module+0x194/0x260
 [<ffffffff810d1b62>] ? audit_syscall_entry+0x272/0x2a0
 [<ffffffff814e0c3e>] ? do_page_fault+0x3e/0xa0
 [<ffffffff8100b172>] system_call_fastpath+0x16/0x1b


Expected results:
No hung.

Additional info:
System cannot reboot.
Comment 1 Andy Gospodarek 2011-08-02 18:37:05 UTC 
already fixed upstream with commit:

9e2e61fbf8ad016d24e4af0afff13505f3dd2a2a bonding: fix potential deadlock in bond_uninit()
Comment 3 RHEL Program Management 2011-08-05 20:59:54 UTC 
This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.
Comment 4 Kyle McMartin 2011-08-15 12:50:06 UTC 
Patch(es) available on kernel-2.6.32-188.el6
Comment 11 errata-xmlrpc 2011-12-06 13:49:19 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1530.html