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Date:	Sun, 14 Feb 2016 11:01:41 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Badhri Jagan Sridharan <Badhri@...gle.com>
CC:	0day robot <fengguang.wu@...el.com>
Subject: [lkp] [usb] daa556cb5d: WARNING: CPU: 0 PID: 44 at
 kernel/workqueue.c:1380 __queue_work+0x3d2/0x570()

FYI, we noticed the below changes on

https://github.com/0day-ci/linux Amit-Pundir/usb-gadget-u_ether-Add-workqueue-as-bottom-half-handler-for-rx-data-path/20160209-052012
commit daa556cb5d704ad9b4159dc56dd0161e85b3a596 ("usb: gadget: u_ether: Add workqueue as bottom half handler for rx data path")


+-------------------------------------------------------+----------+------------+
|                                                       | v4.5-rc2 | daa556cb5d |
+-------------------------------------------------------+----------+------------+
| boot_successes                                        | 81       | 58         |
| boot_failures                                         | 12       | 50         |
| invoked_oom-killer:gfp_mask=0x                        | 11       | 43         |
| Mem-Info                                              | 11       | 43         |
| Out_of_memory:Kill_process                            | 11       | 43         |
| backtrace:vfs_read                                    | 2        | 12         |
| backtrace:SyS_read                                    | 2        | 12         |
| page_allocation_failure:order:#,mode                  | 3        | 11         |
| warn_alloc_failed+0x                                  | 1        | 5          |
| backtrace:ring_buffer_consumer_thread                 | 1        | 6          |
| backtrace:vfs_write                                   | 1        | 10         |
| backtrace:SyS_write                                   | 1        | 10         |
| BUG:unable_to_handle_kernel                           | 1        |            |
| Oops                                                  | 1        | 1          |
| EIP_is_at_perf_prepare_sample                         | 1        | 1          |
| Kernel_panic-not_syncing:Fatal_exception              | 1        |            |
| backtrace:do_execveat_common                          | 1        | 5          |
| backtrace:SyS_execve                                  | 1        | 5          |
| WARNING:at_kernel/workqueue.c:#__queue_work()         | 0        | 45         |
| backtrace:cpu_startup_entry                           | 0        | 10         |
| backtrace:vfs_writev                                  | 0        | 29         |
| backtrace:SyS_writev                                  | 0        | 27         |
| backtrace:getxattr                                    | 0        | 1          |
| backtrace:SyS_fgetxattr                               | 0        | 1          |
| backtrace:_do_fork                                    | 0        | 5          |
| backtrace:SyS_clone                                   | 0        | 5          |
| backtrace:ring_buffer_producer_thread                 | 0        | 24         |
| backtrace:SyS_pwritev                                 | 0        | 3          |
| backtrace:ip_auto_config                              | 0        | 4          |
| backtrace:kernel_init_freeable                        | 0        | 4          |
| backtrace:path_listxattr                              | 0        | 2          |
| backtrace:SyS_listxattr                               | 0        | 2          |
| backtrace:addrconf_dad_work                           | 0        | 5          |
| backtrace:common_interrupt                            | 0        | 1          |
| backtrace:vmalloc                                     | 0        | 1          |
| backtrace:SyS_add_key                                 | 0        | 1          |
| backtrace:lock_torture_stats                          | 0        | 1          |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0        | 1          |
+-------------------------------------------------------+----------+------------+



[   36.055351] cdc_ether 1-1:1.0 usb1: kevent 11 may have been dropped
[   36.072532] IP-Config: Failed to open irlan0
[   36.080520] ------------[ cut here ]------------
[   36.081565] WARNING: CPU: 0 PID: 44 at kernel/workqueue.c:1380 __queue_work+0x3d2/0x570()
[   36.083375] CPU: 0 PID: 44 Comm: rb_producer Not tainted 4.5.0-rc2-00001-gdaa556cb #1
[   36.084667] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   36.086434]  00000000 00000000 c020be00 c1657549 c020be30 c1049e6e c26fcefc 00000000
[   36.099237]  0000002c c26fd7f0 00000564 c105f0c2 c105f0c2 c82c055c 00000001 00000001
[   36.113302]  c020be40 c1049f62 00000009 00000000 c020be78 c105f0c2 c82c052c 00000000
[   36.121617] Call Trace:
[   36.122473]  [<c1657549>] dump_stack+0x16/0x1d
[   36.123754]  [<c1049e6e>] warn_slowpath_common+0x7e/0xb0
[   36.125100]  [<c105f0c2>] ? __queue_work+0x3d2/0x570
[   36.126255]  [<c105f0c2>] ? __queue_work+0x3d2/0x570
[   36.127327]  [<c1049f62>] warn_slowpath_null+0x22/0x30
[   36.128368]  [<c105f0c2>] __queue_work+0x3d2/0x570
[   36.129291]  [<c105f8bf>] queue_work_on+0x3f/0x80
[   36.130217]  [<c1b324fa>] rx_complete+0xca/0x160
[   36.131064]  [<c1b1927d>] usb_gadget_giveback_request+0x3d/0x50
[   36.134310]  [<c1b1be4a>] dummy_timer+0x40a/0xc20
[   36.140495]  [<c109c60a>] call_timer_fn+0x8a/0x1c0
[   36.146685]  [<c106e5f6>] ? preempt_count_sub+0x146/0x150
[   36.153949]  [<c1b1ba40>] ? dummy_start+0x130/0x130
[   36.159678]  [<c109c9aa>] run_timer_softirq+0x1ba/0x290
[   36.165939]  [<c1b1ba40>] ? dummy_start+0x130/0x130
[   36.167825]  [<c104d39e>] __do_softirq+0x13e/0x3a0
[   36.169240]  [<c104d260>] ? _local_bh_enable+0xb0/0xb0
[   36.170608]  [<c1004bb1>] do_softirq_own_stack+0x31/0x40
[   36.171860]  <IRQ>  [<c104d95d>] irq_exit+0x5d/0x60
[   36.173046]  [<c21f6825>] do_IRQ+0x65/0xc0
[   36.173992]  [<c16843de>] ? check_preemption_disabled+0x2e/0xe0
[   36.175095]  [<c21f626e>] common_interrupt+0x2e/0x40
[   36.176037]  [<c103197e>] ? pvclock_clocksource_read+0x4e/0x1e0
[   36.177123]  [<c103079e>] kvm_clock_read+0x1e/0x60
[   36.180996]  [<c10307f8>] kvm_sched_clock_read+0x8/0x20
[   36.187774]  [<c100a118>] sched_clock+0x8/0x10
[   36.193636]  [<c10c275e>] trace_clock_local+0xe/0x30
[   36.199855]  [<c10c9538>] rb_reserve_next_event+0x68/0x310
[   36.206243]  [<c10ca20a>] ring_buffer_lock_reserve+0x5a/0xc0
[   36.212045]  [<c10cba78>] ring_buffer_producer_thread+0x108/0x690
[   36.214002]  [<c10cbdc1>] ? ring_buffer_producer_thread+0x451/0x690
[   36.215974]  [<c10cb970>] ? wait_to_die+0x60/0x60
[   36.217207]  [<c1065f34>] kthread+0xa4/0xc0
[   36.218078]  [<c21f5990>] ret_from_kernel_thread+0x20/0x40
[   36.219103]  [<c1065e90>] ? insert_kthread_work+0x60/0x60
[   36.220066] ---[ end trace c50a23dd9034717b ]---
[   36.221118] Sending DHCP requests ., OK





Thanks,
Ying Huang

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