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] [] dump_stack+0x16/0x1d [ 36.123754] [] warn_slowpath_common+0x7e/0xb0 [ 36.125100] [] ? __queue_work+0x3d2/0x570 [ 36.126255] [] ? __queue_work+0x3d2/0x570 [ 36.127327] [] warn_slowpath_null+0x22/0x30 [ 36.128368] [] __queue_work+0x3d2/0x570 [ 36.129291] [] queue_work_on+0x3f/0x80 [ 36.130217] [] rx_complete+0xca/0x160 [ 36.131064] [] usb_gadget_giveback_request+0x3d/0x50 [ 36.134310] [] dummy_timer+0x40a/0xc20 [ 36.140495] [] call_timer_fn+0x8a/0x1c0 [ 36.146685] [] ? preempt_count_sub+0x146/0x150 [ 36.153949] [] ? dummy_start+0x130/0x130 [ 36.159678] [] run_timer_softirq+0x1ba/0x290 [ 36.165939] [] ? dummy_start+0x130/0x130 [ 36.167825] [] __do_softirq+0x13e/0x3a0 [ 36.169240] [] ? _local_bh_enable+0xb0/0xb0 [ 36.170608] [] do_softirq_own_stack+0x31/0x40 [ 36.171860] [] irq_exit+0x5d/0x60 [ 36.173046] [] do_IRQ+0x65/0xc0 [ 36.173992] [] ? check_preemption_disabled+0x2e/0xe0 [ 36.175095] [] common_interrupt+0x2e/0x40 [ 36.176037] [] ? pvclock_clocksource_read+0x4e/0x1e0 [ 36.177123] [] kvm_clock_read+0x1e/0x60 [ 36.180996] [] kvm_sched_clock_read+0x8/0x20 [ 36.187774] [] sched_clock+0x8/0x10 [ 36.193636] [] trace_clock_local+0xe/0x30 [ 36.199855] [] rb_reserve_next_event+0x68/0x310 [ 36.206243] [] ring_buffer_lock_reserve+0x5a/0xc0 [ 36.212045] [] ring_buffer_producer_thread+0x108/0x690 [ 36.214002] [] ? ring_buffer_producer_thread+0x451/0x690 [ 36.215974] [] ? wait_to_die+0x60/0x60 [ 36.217207] [] kthread+0xa4/0xc0 [ 36.218078] [] ret_from_kernel_thread+0x20/0x40 [ 36.219103] [] ? insert_kthread_work+0x60/0x60 [ 36.220066] ---[ end trace c50a23dd9034717b ]--- [ 36.221118] Sending DHCP requests ., OK Thanks, Ying Huang