linux-kernel - [usb] c7de573471: BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 59s!

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Date:	Mon, 15 Aug 2016 20:38:08 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:	lkp@...org, Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>,
	Brian E Rogers <brian.e.rogers@...el.com>
Subject: [usb]  c7de573471: BUG: workqueue lockup - pool cpus=0 node=0
 flags=0x0 nice=0 stuck for 59s!


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit c7de573471832dff7d31f0c13b0f143d6f017799 ("usb: dwc3: gadget: increment request->actual once")

in testcase: boot

on test machine: 1 threads qemu-system-i386 -enable-kvm with 320M memory

caused below changes:


+----------------------------------------------------------------+----------+------------+
|                                                                | v4.8-rc1 | c7de573471 |
+----------------------------------------------------------------+----------+------------+
| boot_successes                                                 | 453      | 13         |
| boot_failures                                                  | 4        | 21         |
| BUG:kernel_test_crashed                                        | 4        |            |
| BUG:workqueue_lockup-pool_cpus=#node=#flags=#nice=#stuck_for#s | 0        | 21         |
+----------------------------------------------------------------+----------+------------+



[   44.453812] Testing concurrent rhashtable access from 10 threads
[   80.419826] Writes:  Total: 2  Max/Min: 0/0   Fail: 0 
[  141.860443] Writes:  Total: 2  Max/Min: 0/0   Fail: 0 
[  191.361700] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 59s!
[  191.415885] Showing busy workqueues and worker pools:
[  191.422202] workqueue events: flags=0x0
[  191.438343]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256


FYI, raw QEMU command line is:

	qemu-system-i386 -enable-kvm -kernel /pkg/linux/i386-randconfig-n0-201632/gcc-6/c7de573471832dff7d31f0c13b0f143d6f017799/vmlinuz-4.8.0-rc1-00001-gc7de573 -append 'ip=::::vm-lkp-wsx03-openwrt-i386-11::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-lkp-wsx03-openwrt-i386-11/boot-1-openwrt-i386.cgz-c7de573471832dff7d31f0c13b0f143d6f017799-20160815-37637-1fnmlqx-0.yaml ARCH=i386 kconfig=i386-randconfig-n0-201632 branch=balbi-usb/testing/next commit=c7de573471832dff7d31f0c13b0f143d6f017799 BOOT_IMAGE=/pkg/linux/i386-randconfig-n0-201632/gcc-6/c7de573471832dff7d31f0c13b0f143d6f017799/vmlinuz-4.8.0-rc1-00001-gc7de573 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-lkp-wsx03-openwrt-i386/openwrt-i386.cgz/i386-randconfig-n0-201632/gcc-6/c7de573471832dff7d31f0c13b0f143d6f017799/0 LKP_SERVER=inn debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw drbd.minor_count=8'  -initrd /fs/sdc1/initrd-vm-lkp-wsx03-openwrt-i386-11 -m 320 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/sdc1/disk0-vm-lkp-wsx03-openwrt-i386-11,media=disk,if=virtio -drive file=/fs/sdc1/disk1-vm-lkp-wsx03-openwrt-i386-11,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-lkp-wsx03-openwrt-i386-11 -serial file:/dev/shm/kboot/serial-vm-lkp-wsx03-openwrt-i386-11 -daemonize -display none -monitor null 





Thanks,
Kernel Test Robot

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