Return-path: Received: from mail-wm0-f66.google.com ([74.125.82.66]:44978 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753488AbdKFP5N (ORCPT ); Mon, 6 Nov 2017 10:57:13 -0500 Message-ID: <1509983829.10974.2.camel@gmail.com> (sfid-20171106_165731_715160_74DF3A17) Subject: Soft lockup in rt2x00usb_work_rxdone() From: Richard Genoud To: Stanislaw Gruszka , Helmut Schaa Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org Date: Mon, 06 Nov 2017 16:57:09 +0100 Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi, I get a soft lock-up while unbinding the USB driver on a TP-Link TL-WN727Nv3 (chipset 5370): # echo 1-2.2 > /sys/bus/usb/drivers/usb/unbind watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u2:3:308] CPU: 0 PID: 308 Comm: kworker/u2:3 Not tainted 4.14.0-rc8 #11 Hardware name: Atmel AT91SAM9 Workqueue: phy0 rt2x00usb_work_rxdone task: c7b91000 task.stack: c7bee000 PC is at rt2x00lib_rxdone+0x590/0x5b8 LR is at rt2x00lib_dmadone+0x54/0x58 pc : [] lr : [] psr: 80000013 sp : c7befebc ip : 00000052 fp : c7befee4 r10: 00000000 r9 : c79b2b58 r8 : 00000000 r7 : c7816d00 r6 : c780e200 r5 : c79c68dc r4 : c7134ce0 r3 : 00000001 r2 : c70bc200 r1 : ffffa55f r0 : 00000000 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 0005317f Table: 261b8000 DAC: 00000053 CPU: 0 PID: 308 Comm: kworker/u2:3 Not tainted 4.14.0-rc8 #11 Hardware name: Atmel AT91SAM9 Workqueue: phy0 rt2x00usb_work_rxdone [] (unwind_backtrace) from [] (show_stack+0x20/0x24) [] (show_stack) from [] (dump_stack+0x20/0x28) [] (dump_stack) from [] (show_regs+0x1c/0x20) [] (show_regs) from [] (watchdog_timer_fn+0x148/0x1ac) [] (watchdog_timer_fn) from [] (hrtimer_run_queues+0x128/0x250) [] (hrtimer_run_queues) from [] (run_local_timers+0x18/0x68) [] (run_local_timers) from [] (update_process_times+0x38/0x6c) [] (update_process_times) from [] (tick_nohz_handler+0xc0/0x10c) [] (tick_nohz_handler) from [] (ch2_irq+0x30/0x38) [] (ch2_irq) from [] (__handle_irq_event_percpu+0x74/0x1dc) [] (__handle_irq_event_percpu) from [] (handle_irq_event_percpu+0x2c/0x68) [] (handle_irq_event_percpu) from [] (handle_irq_event+0x38/0x4c) [] (handle_irq_event) from [] (handle_fasteoi_irq+0xa0/0x114) [] (handle_fasteoi_irq) from [] (generic_handle_irq+0x28/0x38) [] (generic_handle_irq) from [] (__handle_domain_irq+0x90/0xb8) [] (__handle_domain_irq) from [] (aic_handle+0xb0/0xb8) [] (aic_handle) from [] (__irq_svc+0x68/0x84) Exception stack(0xc7befe68 to 0xc7befeb0) fe60: 00000000 ffffa55f c70bc200 00000001 c7134ce0 c79c68dc fe80: c780e200 c7816d00 00000000 c79b2b58 00000000 c7befee4 00000052 c7befebc fea0: c0331fdc c0332978 80000013 ffffffff [] (__irq_svc) from [] (rt2x00lib_rxdone+0x590/0x5b8) [] (rt2x00lib_rxdone) from [] (rt2x00usb_work_rxdone+0x60/0x7c) [] (rt2x00usb_work_rxdone) from [] (process_one_work+0x1e4/0x3a0) [] (process_one_work) from [] (worker_thread+0x2c8/0x45c) [] (worker_thread) from [] (kthread+0x114/0x130) [] (kthread) from [] (ret_from_fork+0x14/0x2c) I can trigger this each time. NB: if the wifi is deactivated properly before the unbind, there's no problem : # ifconfig wlan0 down ; echo 1-2.2 > /sys/bus/usb/drivers/usb/unbind wlan0: deauthenticating from 06:18:d6:91:9e:29 by local choice (Reason: 3=DEAUTH_LEAVING) Full dmesg: ## Booting kernel from Legacy Image at 20007fc0 ... Image Name: Linux-4.14.0-rc8 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 4522192 Bytes = 4.3 MiB Load Address: 20008000 Entry Point: 20008000 ## Flattened Device Tree blob at 26400000 Booting using the fdt blob at 0x26400000 XIP Kernel Image ... OK Loading Device Tree to 27df2000, end 27dfcbb3 ... OK Starting kernel ... Booting Linux on physical CPU 0x0 Linux version 4.14.0-rc8 (rgenoud@lnx-rg) (gcc version 4.7.3 (GCC)) #11 Mon Nov 6 16:22:49 CET 2017 CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f CPU: VIVT data cache, VIVT instruction cache OF: fdt: Machine model: Paratronic LNS Memory policy: Data cache writeback On node 0 totalpages: 32768 free_area_init_node: node 0, pgdat c08a4b78, node_mem_map c7efb000 Normal zone: 256 pages used for memmap Normal zone: 0 pages reserved Normal zone: 32768 pages, LIFO batch:7 random: fast init done pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 pcpu-alloc: [0] 0 Built 1 zonelists, mobility grouping on. Total pages: 32512 Kernel command line: loglevel=8 ro root=ubi0:rootfs rootfstype=ubifs ubi.mtd=ubi lpj=995328 ubi.fm_autoconvert=1 panic=2 mtdparts=atmel_nand:256M(all),128k@0(dtb),10112k(kernel),251392k(ubi),512k(bbt)ro atmel-nand-controller.use_dma=0 spidev.bufsiz=53200 video=320x240-32 PID hash table entries: 512 (order: -1, 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) Memory: 120624K/131072K available (5847K kernel code, 475K rwdata, 1504K rodata, 480K init, 245K bss, 10448K reserved, 0K cma-reserved) Virtual kernel memory layout: vector : 0xffff0000 - 0xffff1000 ( 4 kB) fixmap : 0xffc00000 - 0xfff00000 (3072 kB) vmalloc : 0xc8800000 - 0xff800000 ( 880 MB) lowmem : 0xc0000000 - 0xc8000000 ( 128 MB) .text : 0xc0008000 - 0xc05be200 (5849 kB) .init : 0xc07be000 - 0xc0836000 ( 480 kB) .data : 0xc0836000 - 0xc08accd0 ( 476 kB) .bss : 0xc08b20e8 - 0xc08ef77c ( 246 kB) ftrace: allocating 23621 entries in 70 pages NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 clocksource: pit: mask: 0xfffffff max_cycles: 0xfffffff, max_idle_ns: 14334453866 ns sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns Console: colour dummy device 80x30 console [tty0] enabled Calibrating delay loop (skipped) preset value.. 199.06 BogoMIPS (lpj=995328) pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) CPU: Testing write buffer coherency: ok Setting up static identity map for 0x20008400 - 0x2000843c devtmpfs: initialized clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns futex hash table entries: 256 (order: -1, 3072 bytes) pinctrl core: initialized pinctrl subsystem NET: Registered protocol family 16 DMA: preallocated 256 KiB pool for atomic coherent allocations AT91: PM: standby: standby, suspend: ulp0 gpio-at91 fffff400.gpio: at address c8861400 gpio-at91 fffff600.gpio: at address c8863600 gpio-at91 fffff800.gpio: at address c8865800 gpio-at91 fffffa00.gpio: at address c8867a00 pinctrl-at91 ahb:apb:pinctrl@fffff400: initialized AT91 pinctrl driver tcb_clksrc: tc0 at 16.166 MHz clocksource: tcb_clksrc: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 114675631333 ns at_hdmac ffffec00.dma-controller: Atmel AHB DMA Controller ( cpy set slave ), 8 channels at_hdmac ffffee00.dma-controller: Atmel AHB DMA Controller ( cpy set slave ), 8 channels AT91: Detected SoC family: at91sam9x5 AT91: Detected SoC: at91sam9g35, revision 1 SCSI subsystem initialized usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb i2c-gpio i2c-gpio-0: using pins 30 (SDA) and 31 (SCL) pps_core: LinuxPPS API ver. 1 registered pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti PTP clock support registered clocksource: Switched to clocksource tcb_clksrc NET: Registered protocol family 2 TCP established hash table entries: 1024 (order: 0, 4096 bytes) TCP bind hash table entries: 1024 (order: 0, 4096 bytes) TCP: Hash tables configured (established 1024 bind 1024) UDP hash table entries: 256 (order: 0, 4096 bytes) UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) NET: Registered protocol family 1 RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. workingset: timestamp_bits=30 max_order=15 bucket_order=0 Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250) io scheduler noop registered (default) io scheduler mq-deadline registered io scheduler kyber registered fffff200.serial: ttyS0 at MMIO 0xfffff200 (irq = 16, base_baud = 8333333) is a ATMEL_SERIAL console [ttyS0] enabled f801c000.serial: ttyS1 at MMIO 0xf801c000 (irq = 23, base_baud = 8333333) is a ATMEL_SERIAL f8020000.serial: ttyS2 at MMIO 0xf8020000 (irq = 24, base_baud = 8333333) is a ATMEL_SERIAL f8024000.serial: ttyS3 at MMIO 0xf8024000 (irq = 25, base_baud = 8333333) is a ATMEL_SERIAL brd: module loaded loop: module loaded ssc f0010000.ssc: Atmel SSC device at 0xc88a0000 (irq 22) at24 0-0053: 256 byte 24c02 EEPROM, writable, 16 bytes/write at24 0-0051: 65536 byte 24c512 EEPROM, writable, 128 bytes/write nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda nand: Micron MT29F2G08ABAEAWP nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 Bad block table found at page 131008, version 0x01 Bad block table found at page 130944, version 0x01 5 cmdlinepart partitions found on MTD device atmel_nand Creating 5 MTD partitions on "atmel_nand": 0x000000000000-0x000010000000 : "all" 0x000000000000-0x000000020000 : "dtb" 0x000000020000-0x000000a00000 : "kernel" 0x000000a00000-0x00000ff80000 : "ubi" 0x00000ff80000-0x000010000000 : "bbt" atmel-pmecc ffffe000.ecc-engine: can't request region for resource [mem 0xffffe000-0xffffe5ff] atmel-pmecc: probe of ffffe000.ecc-engine failed with error -16 m25p80 spi0.0: at25df321a (4096 Kbytes) 4 ofpart partitions found on MTD device spi0.0 Creating 4 MTD partitions on "spi0.0": 0x000000000000-0x000000008000 : "bootpri" 0x000000008000-0x000000108000 : "bootsec" 0x000000108000-0x000000218000 : "bootenv" 0x000000110000-0x000000400000 : "free" atmel_spi f0000000.spi: Atmel SPI Controller version 0x212 at 0xf0000000 (irq 27) atmel_spi f0004000.spi: Atmel SPI Controller version 0x212 at 0xf0004000 (irq 28) libphy: Fixed MDIO Bus: probed tun: Universal TUN/TAP device driver, 1.6 libphy: MACB_mii_bus: probed Davicom DM9161A f802c000.ethernet-ffffffff:00: attached PHY driver [Davicom DM9161A] (mii_bus:phy_addr=f802c000.ethernet-ffffffff:00, irq=POLL) macb f802c000.ethernet eth0: Cadence MACB rev 0x0001010c at 0xf802c000 irq 31 (00:04:a3:d2:a7:ef) PPP generic driver version 2.4.2 PPP Deflate Compression module registered usbcore: registered new interface driver rt2800usb usbcore: registered new interface driver cdc_ether usbcore: registered new interface driver rndis_host usbcore: registered new interface driver cdc_ncm usbcore: registered new interface driver qmi_wwan ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver ehci-atmel: EHCI Atmel driver atmel-ehci 700000.ehci: EHCI Host Controller atmel-ehci 700000.ehci: new USB bus registered, assigned bus number 1 atmel-ehci 700000.ehci: irq 32, io mem 0x00700000 atmel-ehci 700000.ehci: USB 2.0 started, EHCI 1.00 usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: Product: EHCI Host Controller usb usb1: Manufacturer: Linux 4.14.0-rc8 ehci_hcd usb usb1: SerialNumber: 700000.ehci hub 1-0:1.0: USB hub found hub 1-0:1.0: 3 ports detected usbcore: registered new interface driver cdc_acm cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters usbcore: registered new interface driver cdc_wdm usbcore: registered new interface driver usb-storage usbcore: registered new interface driver usbserial usbcore: registered new interface driver option usbserial: USB Serial support registered for GSM modem (1-port) usbcore: registered new interface driver pl2303 usbserial: USB Serial support registered for pl2303 usbcore: registered new interface driver qcserial usbserial: USB Serial support registered for Qualcomm USB modem usbcore: registered new interface driver sierra usbserial: USB Serial support registered for Sierra USB modem atmel_usba_udc 500000.gadget: MMIO registers at 0xf803c000 mapped at c88e1000 atmel_usba_udc 500000.gadget: FIFO at 0x00500000 mapped at c8a80000 using random self ethernet address using random host ethernet address usb0: HOST MAC 56:0b:bc:61:78:8c usb0: MAC fa:b6:82:52:5d:bb using random self ethernet address using random host ethernet address g_ether gadget: Ethernet Gadget, version: Memorial Day 2008 g_ether gadget: g_ether ready i2c /dev entries driver AT91: Starting after user reset at91_wdt fffffe40.watchdog: watchdog is disabled at91_wdt: probe of fffffe40.watchdog failed with error -22 hidraw: raw HID events driver (C) Jiri Kosina usbcore: registered new interface driver usbhid usbhid: USB HID core driver Netfilter messages via NETLINK v0.30. nf_conntrack version 0.5.0 (2048 buckets, 8192 max) ctnetlink v0.93: registering with nfnetlink. ip_tables: (C) 2000-2006 Netfilter Core Team Initializing XFRM netlink socket NET: Registered protocol family 10 Segment Routing with IPv6 ip6_tables: (C) 2000-2006 Netfilter Core Team sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver NET: Registered protocol family 17 NET: Registered protocol family 15 Key type dns_resolver registered ubi0: default fastmap pool size: 95 ubi0: default fastmap WL pool size: 47 ubi0: attaching mtd3 atmel_usba_udc 500000.gadget: ODD: EP5 configuration is invalid! atmel_usba_udc 500000.gadget: ODD: EP6 configuration is invalid! atmel_usba_udc 500000.gadget: ODD: EP5 configuration is invalid! atmel_usba_udc 500000.gadget: ODD: EP6 configuration is invalid! usb 1-2: new high-speed USB device number 2 using atmel-ehci g_ether gadget: high-speed config #1: CDC Ethernet (ECM) ubi0: attached by fastmap ubi0: fastmap pool size: 95 ubi0: fastmap WL pool size: 47 usb 1-2: New USB device found, idVendor=0424, idProduct=2512 usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0 hub 1-2:1.0: USB hub found hub 1-2:1.0: 2 ports detected ubi0: attached mtd3 (name "ubi", size 245 MiB) ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048 ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096 ubi0: good PEBs: 1964, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 3, internal volumes: 1, max. volumes count: 128 ubi0: max/mean erase counter: 32/12, WL threshold: 4096, image sequence number: 216151522 ubi0: available PEBs: 0, total reserved PEBs: 1964, PEBs reserved for bad PEB handling: 40 backlight-power-supply: disabling panel-power-supply: disabling ubi0: background thread "ubi_bgt0d" started, PID 618 atmel_usart fffff200.serial: using dma1chan0 for rx DMA transfers atmel_usart fffff200.serial: using dma1chan1 for tx DMA transfers UBIFS (ubi0:0): recovery needed UBIFS (ubi0:0): recovery deferred UBIFS (ubi0:0): UBIFS: mounted UBI device 0, volume 0, name "rootfs", R/O mode UBIFS (ubi0:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes UBIFS (ubi0:0): FS size: 66789376 bytes (63 MiB, 526 LEBs), journal size 9015296 bytes (8 MiB, 71 LEBs) UBIFS (ubi0:0): reserved for root: 0 bytes (0 KiB) UBIFS (ubi0:0): media format: w4/r0 (latest is w5/r0), UUID 764284F8-1DF2-40F9-BFB6-C0DC0D4D143F, small LPT model VFS: Mounted root (ubifs filesystem) readonly on device 0:14. devtmpfs: mounted Freeing unused kernel memory: 480K This architecture does not have kernel memory protection. usb 1-2.2: new high-speed USB device number 3 using atmel-ehci usb 1-2.2: New USB device found, idVendor=148f, idProduct=5370 usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-2.2: Product: 802.11 n WLAN usb 1-2.2: Manufacturer: TPlink usb 1-2.2: SerialNumber: 1.0 UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 631 usb 1-2.2: reset high-speed USB device number 3 using atmel-ehci UBIFS (ubi0:2): recovery needed ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 5390, rev 0502 detected ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 5370 detected ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' UBIFS (ubi0:2): recovery completed UBIFS (ubi0:2): UBIFS: mounted UBI device 0, volume 2, name "data" UBIFS (ubi0:2): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes UBIFS (ubi0:2): FS size: 105771008 bytes (100 MiB, 833 LEBs), journal size 9023488 bytes (8 MiB, 72 LEBs) UBIFS (ubi0:2): reserved for root: 0 bytes (0 KiB) UBIFS (ubi0:2): media format: w4/r0 (latest is w5/r0), UUID F6094496-0276-4615-A1FF-CE370C8017B0, small LPT model Watchdog disabled ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin' ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36 IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready wlan0: authenticate with 06:18:d6:91:9e:29 wlan0: send auth to 06:18:d6:91:9e:29 (try 1/3) wlan0: authenticated wlan0: associate with 06:18:d6:91:9e:29 (try 1/3) wlan0: RX AssocResp from 06:18:d6:91:9e:29 (capab=0x431 status=0 aid=2) wlan0: associated IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready # ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) tether Link encap:Ethernet HWaddr FA:B6:82:52:5D:BB inet addr:192.168.5.1 Bcast:192.168.5.255 Mask:255.255.255.0 inet6 addr: fe80::3039:28ff:fe3d:96e8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:39 errors:0 dropped:0 overruns:0 frame:0 TX packets:11 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6930 (6.7 KiB) TX bytes:2046 (1.9 KiB) usb0 Link encap:Ethernet HWaddr FA:B6:82:52:5D:BB inet6 addr: fe80::f8b6:82ff:fe52:5dbb/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:41 errors:0 dropped:0 overruns:0 frame:0 TX packets:16 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7334 (7.1 KiB) TX bytes:2432 (2.3 KiB) wlan0 Link encap:Ethernet HWaddr 10:FE:ED:25:B1:0D inet addr:192.168.3.134 Bcast:192.168.3.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:10 errors:0 dropped:0 overruns:0 frame:0 TX packets:10 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1440 (1.4 KiB) TX bytes:2052 (2.0 KiB) # echo 1-2.2 > /sys/bus/usb/drivers/usb/unbind watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u2:3:308] CPU: 0 PID: 308 Comm: kworker/u2:3 Not tainted 4.14.0-rc8 #11 Hardware name: Atmel AT91SAM9 Workqueue: phy0 rt2x00usb_work_rxdone task: c7b91000 task.stack: c7bee000 PC is at rt2x00lib_rxdone+0x590/0x5b8 LR is at rt2x00lib_dmadone+0x54/0x58 pc : [] lr : [] psr: 80000013 sp : c7befebc ip : 00000052 fp : c7befee4 r10: 00000000 r9 : c79b2b58 r8 : 00000000 r7 : c7816d00 r6 : c780e200 r5 : c79c68dc r4 : c7134ce0 r3 : 00000001 r2 : c70bc200 r1 : ffffa55f r0 : 00000000 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 0005317f Table: 261b8000 DAC: 00000053 CPU: 0 PID: 308 Comm: kworker/u2:3 Not tainted 4.14.0-rc8 #11 Hardware name: Atmel AT91SAM9 Workqueue: phy0 rt2x00usb_work_rxdone [] (unwind_backtrace) from [] (show_stack+0x20/0x24) [] (show_stack) from [] (dump_stack+0x20/0x28) [] (dump_stack) from [] (show_regs+0x1c/0x20) [] (show_regs) from [] (watchdog_timer_fn+0x148/0x1ac) [] (watchdog_timer_fn) from [] (hrtimer_run_queues+0x128/0x250) [] (hrtimer_run_queues) from [] (run_local_timers+0x18/0x68) [] (run_local_timers) from [] (update_process_times+0x38/0x6c) [] (update_process_times) from [] (tick_nohz_handler+0xc0/0x10c) [] (tick_nohz_handler) from [] (ch2_irq+0x30/0x38) [] (ch2_irq) from [] (__handle_irq_event_percpu+0x74/0x1dc) [] (__handle_irq_event_percpu) from [] (handle_irq_event_percpu+0x2c/0x68) [] (handle_irq_event_percpu) from [] (handle_irq_event+0x38/0x4c) [] (handle_irq_event) from [] (handle_fasteoi_irq+0xa0/0x114) [] (handle_fasteoi_irq) from [] (generic_handle_irq+0x28/0x38) [] (generic_handle_irq) from [] (__handle_domain_irq+0x90/0xb8) [] (__handle_domain_irq) from [] (aic_handle+0xb0/0xb8) [] (aic_handle) from [] (__irq_svc+0x68/0x84) Exception stack(0xc7befe68 to 0xc7befeb0) fe60: 00000000 ffffa55f c70bc200 00000001 c7134ce0 c79c68dc fe80: c780e200 c7816d00 00000000 c79b2b58 00000000 c7befee4 00000052 c7befebc fea0: c0331fdc c0332978 80000013 ffffffff [] (__irq_svc) from [] (rt2x00lib_rxdone+0x590/0x5b8) [] (rt2x00lib_rxdone) from [] (rt2x00usb_work_rxdone+0x60/0x7c) [] (rt2x00usb_work_rxdone) from [] (process_one_work+0x1e4/0x3a0) [] (process_one_work) from [] (worker_thread+0x2c8/0x45c) [] (worker_thread) from [] (kthread+0x114/0x130) [] (kthread) from [] (ret_from_fork+0x14/0x2c) Regards, Richard