linux-next boot error: WARNING: suspicious RCU usage in ipmr_get_table

syzbot
2020-04-28T08:47:21Z

Hello,

syzbot found the following crash on:

HEAD commit: 0fd02a5d Add linux-next specific files for 20200428
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1696e5d8100000
kernel config: https://syzkaller.appspot.com/x/.config?x=9748c3e397b4529
dashboard link: https://syzkaller.appspot.com/bug?extid=1519f497f2f9f08183c6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1519f497f2f9f08183c6@syzkaller.appspotmail.com

SCSI subsystem initialized
ACPI: bus type USB registered
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
mc: Linux media interface: v0.10
videodev: Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
EDAC MC: Ver: 3.0.0
Advanced Linux Sound Architecture Driver Initialized.
PCI: Using ACPI for IRQ routing
Bluetooth: Core ver 2.22
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
NET: Registered protocol family 8
NET: Registered protocol family 20
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
NetLabel: unlabeled traffic allowed by default
nfc: nfc_init: NFC Core ver 0.1
NET: Registered protocol family 39
clocksource: Switched to clocksource kvm-clock
VFS: Disk quotas dquot_6.6.0
VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
FS-Cache: Loaded
CacheFiles: Loaded
TOMOYO: 2.6.0
Mandatory Access Control activated.
AppArmor: AppArmor Filesystem Enabled
pnp: PnP ACPI init
pnp: PnP ACPI: found 7 devices
clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window]
pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window]
pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfffff window]
NET: Registered protocol family 2
tcp_listen_portaddr_hash hash table entries: 4096 (order: 6, 327680 bytes, vmalloc)
TCP established hash table entries: 65536 (order: 7, 524288 bytes, vmalloc)
TCP bind hash table entries: 65536 (order: 10, 4718592 bytes, vmalloc)
TCP: Hash tables configured (established 65536 bind 65536)
UDP hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
UDP-Lite hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
=============================
WARNING: suspicious RCU usage
5.7.0-rc3-next-20200428-syzkaller #0 Not tainted
-----------------------------
net/ipv4/ipmr.c:136 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by swapper/0/1:
#0: ffffffff8a5a6330 (pernet_ops_rwsem){+.+.}-{3:3}, at: register_pernet_subsys+0x16/0x40 net/core/net_namespace.c:1257

stack backtrace:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc3-next-20200428-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
ipmr_get_table+0x130/0x160 net/ipv4/ipmr.c:136
ipmr_new_table net/ipv4/ipmr.c:403 [inline]
ipmr_rules_init net/ipv4/ipmr.c:248 [inline]
ipmr_net_init+0x133/0x430 net/ipv4/ipmr.c:3089
ops_init+0xaf/0x420 net/core/net_namespace.c:151
__register_pernet_operations net/core/net_namespace.c:1140 [inline]
register_pernet_operations+0x346/0x840 net/core/net_namespace.c:1217
register_pernet_subsys+0x25/0x40 net/core/net_namespace.c:1258
ip_mr_init+0x36/0x168 net/ipv4/ipmr.c:3140
inet_init+0x298/0x424 net/ipv4/af_inet.c:2005
do_one_initcall+0x10a/0x7d0 init/main.c:1159
do_initcall_level init/main.c:1232 [inline]
do_initcalls init/main.c:1248 [inline]
do_basic_setup init/main.c:1268 [inline]
kernel_init_freeable+0x501/0x5ae init/main.c:1454
kernel_init+0xd/0x1bb init/main.c:1359
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
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.
NET: Registered protocol family 44
pci 0000:00:00.0: Limiting direct PCI/PCI transfers
PCI: CLS 0 bytes, default 64
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
software IO TLB: mapped [mem 0xaa600000-0xae600000] (64MB)
RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl timer
kvm: already loaded the other module
clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x212735223b2, max_idle_ns: 440795277976 ns
clocksource: Switched to clocksource tsc
mce: Machine check injector initialized
check: Scanning for low memory corruption every 60 seconds
Initialise system trusted keyrings
workingset: timestamp_bits=40 max_order=21 bucket_order=0
zbud: loaded
DLM installed
squashfs: version 4.0 (2009/01/31) Phillip Lougher
FS-Cache: Netfs 'nfs' registered for caching
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
nfs4filelayout_init: NFSv4 File Layout Driver Registering...
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
FS-Cache: Netfs 'cifs' registered for caching
Key type cifs.spnego registered
Key type cifs.idmap registered
ntfs: driver 2.1.32 [Flags: R/W].
fuse: init (API version 7.31)
JFS: nTxBlock = 8192, nTxLock = 65536
SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
9p: Installing v9fs 9p2000 file system support
FS-Cache: Netfs '9p' registered for caching
ocfs2: Registered cluster interface o2cb
ocfs2: Registered cluster interface user
OCFS2 User DLM kernel interface loaded
gfs2: GFS2 installed
FS-Cache: Netfs 'ceph' registered for caching
ceph: loaded (mds proto 32)
NET: Registered protocol family 38
async_tx: api initialized (async)
Key type asymmetric registered
Asymmetric key parser 'x509' registered
Asymmetric key parser 'pkcs8' registered
Key type pkcs7_test registered
Asymmetric key parser 'tpm_parser' registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 243)
io scheduler mq-deadline registered
io scheduler kyber registered
io scheduler bfq registered
hgafb: HGA card not detected.
hgafb: probe of hgafb.0 failed with error -22
usbcore: registered new interface driver udlfb
uvesafb: failed to execute /sbin/v86d
uvesafb: make sure that the v86d helper is installed and executable
uvesafb: Getting VBE info block failed (eax=0x4f00, err=-2)
uvesafb: vbe_init() failed with -22
uvesafb: probe of uvesafb.0 failed with error -22
vga16fb: mapped to 0x000000002f252cfb
Console: switching to colour frame buffer device 80x30
fb0: VGA16 VGA frame buffer device
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: Power Button [PWRF]
input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
ACPI: Sleep Button [SLPF]
ioatdma: Intel(R) QuickData Technology Driver 5.00
PCI Interrupt Link [LNKC] enabled at IRQ 11
virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
PCI Interrupt Link [LNKD] enabled at IRQ 10
virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
PCI Interrupt Link [LNKA] enabled at IRQ 10
virtio-pci 0000:00:05.0: virtio_pci: leaving for legacy driver
N_HDLC line discipline registered with maxframe=4096
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
Cyclades driver 2.6
Initializing Nozomi driver 2.1d
RocketPort device driver module, version 2.09, 12-June-2003
No rocketport ports found; unloading driver
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
[drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
usbcore: registered new interface driver udl
brd: module loaded
loop: module loaded
zram: Added device: zram0
null_blk: module loaded
nfcsim 0.2 initialized
Loading iSCSI transport class v2.0-870.
scsi host0: Virtio SCSI HBA
st: Version 20160209, fixed bufsize 32768, s/g segs 256
slram: not enough parameters.
ftl_cs: FTL header not found.
wireguard: WireGuard 1.0.0 loaded. See www.wireguard.com for information.
wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
eql: Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)
MACsec IEEE 802.1AE
tun: Universal TUN/TAP device driver, 1.6
vcan: Virtual CAN interface driver
vxcan: Virtual CAN Tunnel driver
slcan: serial line CAN interface driver
slcan: 10 dynamic interface channels.
CAN device driver interface
e100: Intel(R) PRO/100 Network Driver, 3.5.24-k2-NAPI
e100: Copyright(c) 1999-2006 Intel Corporation
e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
e1000: Copyright (c) 1999-2006 Intel Corporation.
e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
mkiss: AX.25 Multikiss, Hans Albas PE1AYX
AX.25: 6pack driver, Revision: 0.3.0
AX.25: bpqether driver version 004
PPP generic driver version 2.4.2
PPP BSD Compression module registered
PPP Deflate Compression module registered
PPP MPPE Compression module registered
NET: Registered protocol family 24
PPTP driver version 0.8.5
SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256) (6 bit encapsulation enabled).
CSLIP: code copyright 1989 Regents of the University of California.
SLIP linefill/keepalive option.
hdlc: HDLC support module revision 1.22
x25_asy: X.25 async: version 0.00 ALPHA (dynamic channels, max=256)
DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org.
LAPB Ethernet driver version 0.02
usbcore: registered new interface driver rndis_wlan
mac80211_hwsim: initializing netlink
fakelb driver is marked as deprecated, please use mac802154_hwsim!
ieee802154fakelb ieee802154fakelb: added 2 fake ieee802154 hardware devices
mac802154_hwsim mac802154_hwsim: Added 2 mac802154 hwsim hardware radios
VMware vmxnet3 virtual NIC driver - version 1.4.17.0-k-NAPI
pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
usbcore: registered new interface driver pegasus
usbcore: registered new interface driver rtl8150
usbcore: registered new interface driver r8152
usbcore: registered new interface driver asix
usbcore: registered new interface driver ax88179_178a
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
usbcore: registered new interface driver smsc75xx
usbcore: registered new interface driver smsc95xx
usbcore: registered new interface driver net1080
usbcore: registered new interface driver rndis_host
usbcore: registered new interface driver cdc_subset
usbcore: registered new interface driver zaurus
usbcore: registered new interface driver MOSCHIP usb-ethernet driver
usbcore: registered new interface driver cdc_ncm
usbcore: registered new interface driver cdc_mbim
VFIO - User Level meta-driver version: 0.3
aoe: AoE v85 initialised.
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-pci: EHCI PCI platform driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci-pci: OHCI PCI platform driver
uhci_hcd: USB Universal Host Controller Interface driver
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 usblp
usbcore: registered new interface driver cdc_wdm
usbcore: registered new interface driver uas
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver ums-realtek
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver ch341
usbserial: USB Serial support registered for ch341-uart
usbcore: registered new interface driver cp210x
usbserial: USB Serial support registered for cp210x
usbcore: registered new interface driver ftdi_sio
usbserial: USB Serial support registered for FTDI USB Serial Device
usbcore: registered new interface driver keyspan
usbserial: USB Serial support registered for Keyspan - (without firmware)
usbserial: USB Serial support registered for Keyspan 1 port adapter
usbserial: USB Serial support registered for Keyspan 2 port adapter
usbserial: USB Serial support registered for Keyspan 4 port adapter
usbcore: registered new interface driver option
usbserial: USB Serial support registered for GSM modem (1-port)
usbcore: registered new interface driver oti6858
usbserial: USB Serial support registered for oti6858
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
usbcore: registered new interface driver usb_serial_simple
usbserial: USB Serial support registered for carelink
usbserial: USB Serial support registered for zio
usbserial: USB Serial support registered for funsoft
usbserial: USB Serial support registered for flashloader
usbserial: USB Serial support registered for google
usbserial: USB Serial support registered for libtransistor
usbserial: USB Serial support registered for vivopay
usbserial: USB Serial support registered for moto_modem
usbserial: USB Serial support registered for motorola_tetra
usbserial: USB Serial support registered for novatel_gps
usbserial: USB Serial support registered for hp4x
usbserial: USB Serial support registered for suunto
usbserial: USB Serial support registered for siemens_mpi
dummy_hcd dummy_hcd.0: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.0: Dummy host controller
dummy_hcd dummy_hcd.0: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: Dummy host controller
usb usb1: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb1: SerialNumber: dummy_hcd.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
dummy_hcd dummy_hcd.1: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.1: Dummy host controller
dummy_hcd dummy_hcd.1: new USB bus registered, assigned bus number 2
usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: Dummy host controller
usb usb2: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb2: SerialNumber: dummy_hcd.1
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
dummy_hcd dummy_hcd.2: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.2: Dummy host controller
dummy_hcd dummy_hcd.2: new USB bus registered, assigned bus number 3
usb usb3: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb3: Product: Dummy host controller
usb usb3: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb3: SerialNumber: dummy_hcd.2
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 1 port detected
dummy_hcd dummy_hcd.3: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.3: Dummy host controller
dummy_hcd dummy_hcd.3: new USB bus registered, assigned bus number 4
usb usb4: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb4: Product: Dummy host controller
usb usb4: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb4: SerialNumber: dummy_hcd.3
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 1 port detected
dummy_hcd dummy_hcd.4: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.4: Dummy host controller
dummy_hcd dummy_hcd.4: new USB bus registered, assigned bus number 5
usb usb5: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb5: Product: Dummy host controller
usb usb5: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb5: SerialNumber: dummy_hcd.4
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 1 port detected
dummy_hcd dummy_hcd.5: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.5: Dummy host controller
dummy_hcd dummy_hcd.5: new USB bus registered, assigned bus number 6
usb usb6: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb6: Product: Dummy host controller
usb usb6: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb6: SerialNumber: dummy_hcd.5
hub 6-0:1.0: USB hub found
hub 6-0:1.0: 1 port detected
dummy_hcd dummy_hcd.6: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.6: Dummy host controller
dummy_hcd dummy_hcd.6: new USB bus registered, assigned bus number 7
usb usb7: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb7: Product: Dummy host controller
usb usb7: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb7: SerialNumber: dummy_hcd.6
hub 7-0:1.0: USB hub found
hub 7-0:1.0: 1 port detected
dummy_hcd dummy_hcd.7: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.7: Dummy host controller
dummy_hcd dummy_hcd.7: new USB bus registered, assigned bus number 8
usb usb8: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb8: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb8: Product: Dummy host controller
usb usb8: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller dummy_hcd
usb usb8: SerialNumber: dummy_hcd.7
hub 8-0:1.0: USB hub found
hub 8-0:1.0: 1 port detected
using random self ethernet address
using random host ethernet address
Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
no file given for LUN0
printk: console [ttyGS0] disabled
g_multi dummy_udc.0: failed to start g_multi: -22
vhci_hcd vhci_hcd.0: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.0: new USB bus registered, assigned bus number 9
vhci_hcd: created sysfs vhci_hcd.0
usb usb9: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb9: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb9: Product: USB/IP Virtual Host Controller
usb usb9: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb9: SerialNumber: vhci_hcd.0
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.0: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.0: new USB bus registered, assigned bus number 10
usb usb10: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb10: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb10: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb10: Product: USB/IP Virtual Host Controller
usb usb10: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb10: SerialNumber: vhci_hcd.0
hub 10-0:1.0: USB hub found
hub 10-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.1: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.1: new USB bus registered, assigned bus number 11
usb usb11: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb11: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb11: Product: USB/IP Virtual Host Controller
usb usb11: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb11: SerialNumber: vhci_hcd.1
hub 11-0:1.0: USB hub found
hub 11-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.1: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.1: new USB bus registered, assigned bus number 12
usb usb12: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb12: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb12: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb12: Product: USB/IP Virtual Host Controller
usb usb12: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb12: SerialNumber: vhci_hcd.1
hub 12-0:1.0: USB hub found
hub 12-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.2: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.2: new USB bus registered, assigned bus number 13
usb usb13: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb13: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb13: Product: USB/IP Virtual Host Controller
usb usb13: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb13: SerialNumber: vhci_hcd.2
hub 13-0:1.0: USB hub found
hub 13-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.2: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.2: new USB bus registered, assigned bus number 14
usb usb14: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb14: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb14: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb14: Product: USB/IP Virtual Host Controller
usb usb14: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb14: SerialNumber: vhci_hcd.2
hub 14-0:1.0: USB hub found
hub 14-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.3: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.3: new USB bus registered, assigned bus number 15
usb usb15: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb15: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb15: Product: USB/IP Virtual Host Controller
usb usb15: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb15: SerialNumber: vhci_hcd.3
hub 15-0:1.0: USB hub found
hub 15-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.3: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.3: new USB bus registered, assigned bus number 16
usb usb16: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb16: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb16: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb16: Product: USB/IP Virtual Host Controller
usb usb16: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb16: SerialNumber: vhci_hcd.3
hub 16-0:1.0: USB hub found
hub 16-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.4: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.4: new USB bus registered, assigned bus number 17
usb usb17: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb17: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb17: Product: USB/IP Virtual Host Controller
usb usb17: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb17: SerialNumber: vhci_hcd.4
hub 17-0:1.0: USB hub found
hub 17-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.4: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.4: new USB bus registered, assigned bus number 18
usb usb18: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb18: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb18: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb18: Product: USB/IP Virtual Host Controller
usb usb18: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb18: SerialNumber: vhci_hcd.4
hub 18-0:1.0: USB hub found
hub 18-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.5: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.5: new USB bus registered, assigned bus number 19
usb usb19: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb19: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb19: Product: USB/IP Virtual Host Controller
usb usb19: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb19: SerialNumber: vhci_hcd.5
hub 19-0:1.0: USB hub found
hub 19-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.5: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.5: new USB bus registered, assigned bus number 20
usb usb20: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb20: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb20: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb20: Product: USB/IP Virtual Host Controller
usb usb20: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb20: SerialNumber: vhci_hcd.5
hub 20-0:1.0: USB hub found
hub 20-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.6: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.6: new USB bus registered, assigned bus number 21
usb usb21: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb21: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb21: Product: USB/IP Virtual Host Controller
usb usb21: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb21: SerialNumber: vhci_hcd.6
hub 21-0:1.0: USB hub found
hub 21-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.6: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.6: new USB bus registered, assigned bus number 22
usb usb22: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb22: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb22: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb22: Product: USB/IP Virtual Host Controller
usb usb22: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb22: SerialNumber: vhci_hcd.6
hub 22-0:1.0: USB hub found
hub 22-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.7: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.7: new USB bus registered, assigned bus number 23
usb usb23: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb23: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb23: Product: USB/IP Virtual Host Controller
usb usb23: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb23: SerialNumber: vhci_hcd.7
hub 23-0:1.0: USB hub found
hub 23-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.7: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.7: new USB bus registered, assigned bus number 24
usb usb24: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb24: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb24: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb24: Product: USB/IP Virtual Host Controller
usb usb24: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb24: SerialNumber: vhci_hcd.7
hub 24-0:1.0: USB hub found
hub 24-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.8: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.8: new USB bus registered, assigned bus number 25
usb usb25: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb25: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb25: Product: USB/IP Virtual Host Controller
usb usb25: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb25: SerialNumber: vhci_hcd.8
hub 25-0:1.0: USB hub found
hub 25-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.8: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.8: new USB bus registered, assigned bus number 26
usb usb26: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb26: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb26: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb26: Product: USB/IP Virtual Host Controller
usb usb26: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb26: SerialNumber: vhci_hcd.8
hub 26-0:1.0: USB hub found
hub 26-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.9: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.9: new USB bus registered, assigned bus number 27
usb usb27: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb27: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb27: Product: USB/IP Virtual Host Controller
usb usb27: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb27: SerialNumber: vhci_hcd.9
hub 27-0:1.0: USB hub found
hub 27-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.9: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.9: new USB bus registered, assigned bus number 28
usb usb28: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb28: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb28: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb28: Product: USB/IP Virtual Host Controller
usb usb28: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb28: SerialNumber: vhci_hcd.9
hub 28-0:1.0: USB hub found
hub 28-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.10: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.10: new USB bus registered, assigned bus number 29
usb usb29: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb29: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb29: Product: USB/IP Virtual Host Controller
usb usb29: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb29: SerialNumber: vhci_hcd.10
hub 29-0:1.0: USB hub found
hub 29-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.10: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.10: new USB bus registered, assigned bus number 30
usb usb30: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb30: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb30: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb30: Product: USB/IP Virtual Host Controller
usb usb30: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb30: SerialNumber: vhci_hcd.10
hub 30-0:1.0: USB hub found
hub 30-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.11: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.11: new USB bus registered, assigned bus number 31
usb usb31: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb31: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb31: Product: USB/IP Virtual Host Controller
usb usb31: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb31: SerialNumber: vhci_hcd.11
hub 31-0:1.0: USB hub found
hub 31-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.11: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.11: new USB bus registered, assigned bus number 32
usb usb32: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb32: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb32: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb32: Product: USB/IP Virtual Host Controller
usb usb32: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb32: SerialNumber: vhci_hcd.11
hub 32-0:1.0: USB hub found
hub 32-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.12: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.12: new USB bus registered, assigned bus number 33
usb usb33: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb33: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb33: Product: USB/IP Virtual Host Controller
usb usb33: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb33: SerialNumber: vhci_hcd.12
hub 33-0:1.0: USB hub found
hub 33-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.12: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.12: new USB bus registered, assigned bus number 34
usb usb34: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb34: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb34: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb34: Product: USB/IP Virtual Host Controller
usb usb34: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb34: SerialNumber: vhci_hcd.12
hub 34-0:1.0: USB hub found
hub 34-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.13: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.13: new USB bus registered, assigned bus number 35
usb usb35: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb35: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb35: Product: USB/IP Virtual Host Controller
usb usb35: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb35: SerialNumber: vhci_hcd.13
hub 35-0:1.0: USB hub found
hub 35-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.13: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.13: new USB bus registered, assigned bus number 36
usb usb36: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb36: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb36: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb36: Product: USB/IP Virtual Host Controller
usb usb36: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb36: SerialNumber: vhci_hcd.13
hub 36-0:1.0: USB hub found
hub 36-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.14: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.14: new USB bus registered, assigned bus number 37
usb usb37: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb37: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb37: Product: USB/IP Virtual Host Controller
usb usb37: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb37: SerialNumber: vhci_hcd.14
hub 37-0:1.0: USB hub found
hub 37-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.14: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.14: new USB bus registered, assigned bus number 38
usb usb38: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb38: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb38: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb38: Product: USB/IP Virtual Host Controller
usb usb38: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb38: SerialNumber: vhci_hcd.14
hub 38-0:1.0: USB hub found
hub 38-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.15: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.15: new USB bus registered, assigned bus number 39
usb usb39: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.07
usb usb39: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb39: Product: USB/IP Virtual Host Controller
usb usb39: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb39: SerialNumber: vhci_hcd.15
hub 39-0:1.0: USB hub found
hub 39-0:1.0: 8 ports detected
vhci_hcd vhci_hcd.15: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.15: new USB bus registered, assigned bus number 40
usb usb40: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb40: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.07
usb usb40: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb40: Product: USB/IP Virtual Host Controller
usb usb40: Manufacturer: Linux 5.7.0-rc3-next-20200428-syzkaller vhci_hcd
usb usb40: SerialNumber: vhci_hcd.15
hub 40-0:1.0: USB hub found
hub 40-0:1.0: 8 ports detected
usbcore: registered new device driver usbip-host
i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
i8042: Warning: Keylock active
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mousedev: PS/2 mouse device common for all mice
rtc_cmos 00:00: RTC can wake from S4
rtc_cmos 00:00: registered as rtc0
rtc_cmos 00:00: alarms up to one day, 114 bytes nvram
i2c /dev entries driver
piix4_smbus 0000:00:01.3: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr
usbcore: registered new interface driver RobotFuzz Open Source InterFace, OSIF
usbcore: registered new interface driver i2c-tiny-usb
IR NEC protocol handler initialized
IR RC5(x/sz) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
IR SANYO protocol handler initialized
IR Sharp protocol handler initialized
IR MCE Keyboard/mouse protocol handler initialized
IR XMP protocol handler initialized
usbcore: registered new interface driver uvcvideo
USB Video Class driver (1.1.1)
gspca_main: v2.14.0 registered
vivid-000: using single planar format API
vivid-000: CEC adapter cec0 registered for HDMI input 0
vivid-000: V4L2 capture device registered as video3
vivid-000: CEC adapter cec1 registered for HDMI output 0
vivid-000: V4L2 output device registered as video4
vivid-000: V4L2 capture device registered as vbi0, supports raw and sliced VBI
vivid-000: V4L2 output device registered as vbi1, supports raw and sliced VBI
vivid-000: V4L2 capture device registered as swradio0
vivid-000: V4L2 receiver device registered as radio0
vivid-000: V4L2 transmitter device registered as radio1
vivid-000: V4L2 metadata capture device registered as video5
vivid-000: V4L2 metadata output device registered as video6
vivid-000: V4L2 touch capture device registered as v4l-touch0
vivid-001: using multiplanar format API
vivid-001: CEC adapter cec2 registered for HDMI input 0
vivid-001: V4L2 capture device registered as video7
vivid-001: CEC adapter cec3 registered for HDMI output 0
vivid-001: V4L2 output device registered as video8
vivid-001: V4L2 capture device registered as vbi2, supports raw and sliced VBI
vivid-001: V4L2 output device registered as vbi3, supports raw and sliced VBI
vivid-001: V4L2 capture device registered as swradio1
vivid-001: V4L2 receiver device registered as radio2
vivid-001: V4L2 transmitter device registered as radio3
vivid-001: V4L2 metadata capture device registered as video9
vivid-001: V4L2 metadata output device registered as video10
vivid-001: V4L2 touch capture device registered as v4l-touch1
vivid-002: using single planar format API
vivid-002: CEC adapter cec4 registered for HDMI input 0
vivid-002: V4L2 capture device registered as video11
vivid-002: CEC adapter cec5 registered for HDMI output 0
vivid-002: V4L2 output device registered as video12
vivid-002: V4L2 capture device registered as vbi4, supports raw and sliced VBI
vivid-002: V4L2 output device registered as vbi5, supports raw and sliced VBI
vivid-002: V4L2 capture device registered as swradio2
vivid-002: V4L2 receiver device registered as radio4
vivid-002: V4L2 transmitter device registered as radio5
vivid-002: V4L2 metadata capture device registered as video13
vivid-002: V4L2 metadata output device registered as video14
vivid-002: V4L2 touch capture device registered as v4l-touch2
vivid-003: using multiplanar format API
vivid-003: CEC adapter cec6 registered for HDMI input 0
vivid-003: V4L2 capture device registered as video15
vivid-003: CEC adapter cec7 registered for HDMI output 0
vivid-003: V4L2 output device registered as video16
vivid-003: V4L2 capture device registered as vbi6, supports raw and sliced VBI
vivid-003: V4L2 output device registered as vbi7, supports raw and sliced VBI
vivid-003: V4L2 capture device registered as swradio3
vivid-003: V4L2 receiver device registered as radio6
vivid-003: V4L2 transmitter device registered as radio7
vivid-003: V4L2 metadata capture device registered as video17
vivid-003: V4L2 metadata output device registered as video18
vivid-003: V4L2 touch capture device registered as v4l-touch3
vivid-004: using single planar format API
vivid-004: CEC adapter cec8 registered for HDMI input 0
vivid-004: V4L2 capture device registered as video19
vivid-004: CEC adapter cec9 registered for HDMI output 0
vivid-004: V4L2 output device registered as video20
vivid-004: V4L2 capture device registered as vbi8, supports raw and sliced VBI
vivid-004: V4L2 output device registered as vbi9, supports raw and sliced VBI
vivid-004: V4L2 capture device registered as swradio4
vivid-004: V4L2 receiver device registered as radio8
vivid-004: V4L2 transmitter device registered as radio9
vivid-004: V4L2 metadata capture device registered as video21
vivid-004: V4L2 metadata output device registered as video22
vivid-004: V4L2 touch capture device registered as v4l-touch4
vivid-005: using multiplanar format API
vivid-005: CEC adapter cec10 registered for HDMI input 0
vivid-005: V4L2 capture device registered as video23
vivid-005: CEC adapter cec11 registered for HDMI output 0
vivid-005: V4L2 output device registered as video24
vivid-005: V4L2 capture device registered as vbi10, supports raw and sliced VBI
vivid-005: V4L2 output device registered as vbi11, supports raw and sliced VBI
vivid-005: V4L2 capture device registered as swradio5
vivid-005: V4L2 receiver device registered as radio10
vivid-005: V4L2 transmitter device registered as radio11
vivid-005: V4L2 metadata capture device registered as video25
vivid-005: V4L2 metadata output device registered as video26
vivid-005: V4L2 touch capture device registered as v4l-touch5
vivid-006: using single planar format API
vivid-006: CEC adapter cec12 registered for HDMI input 0
vivid-006: V4L2 capture device registered as video27
vivid-006: CEC adapter cec13 registered for HDMI output 0
vivid-006: V4L2 output device registered as video28
vivid-006: V4L2 capture device registered as vbi12, supports raw and sliced VBI
vivid-006: V4L2 output device registered as vbi13, supports raw and sliced VBI
vivid-006: V4L2 capture device registered as swradio6
vivid-006: V4L2 receiver device registered as radio12
vivid-006: V4L2 transmitter device registered as radio13
vivid-006: V4L2 metadata capture device registered as video29
vivid-006: V4L2 metadata output device registered as video30
vivid-006: V4L2 touch capture device registered as v4l-touch6
vivid-007: using multiplanar format API
vivid-007: CEC adapter cec14 registered for HDMI input 0
vivid-007: V4L2 capture device registered as video31
vivid-007: CEC adapter cec15 registered for HDMI output 0
vivid-007: V4L2 output device registered as video32
vivid-007: V4L2 capture device registered as vbi14, supports raw and sliced VBI
vivid-007: V4L2 output device registered as vbi15, supports raw and sliced VBI
vivid-007: V4L2 capture device registered as swradio7
vivid-007: V4L2 receiver device registered as radio14
vivid-007: V4L2 transmitter device registered as radio15
vivid-007: V4L2 metadata capture device registered as video33
vivid-007: V4L2 metadata output device registered as video34
vivid-007: V4L2 touch capture device registered as v4l-touch7
vivid-008: using single planar format API
vivid-008: CEC adapter cec16 registered for HDMI input 0
vivid-008: V4L2 capture device registered as video35
vivid-008: CEC adapter cec17 registered for HDMI output 0
vivid-008: V4L2 output device registered as video36
vivid-008: V4L2 capture device registered as vbi16, supports raw and sliced VBI
vivid-008: V4L2 output device registered as vbi17, supports raw and sliced VBI
vivid-008: V4L2 capture device registered as swradio8
vivid-008: V4L2 receiver device registered as radio16
vivid-008: V4L2 transmitter device registered as radio17
vivid-008: V4L2 metadata capture device registered as video37
vivid-008: V4L2 metadata output device registered as video38
vivid-008: V4L2 touch capture device registered as v4l-touch8
vivid-009: using multiplanar format API
vivid-009: CEC adapter cec18 registered for HDMI input 0
vivid-009: V4L2 capture device registered as video39
vivid-009: CEC adapter cec19 registered for HDMI output 0
vivid-009: V4L2 output device registered as video40
vivid-009: V4L2 capture device registered as vbi18, supports raw and sliced VBI
vivid-009: V4L2 output device registered as vbi19, supports raw and sliced VBI
vivid-009: V4L2 capture device registered as swradio9
vivid-009: V4L2 receiver device registered as radio18
vivid-009: V4L2 transmitter device registered as radio19
vivid-009: V4L2 metadata capture device registered as video41
vivid-009: V4L2 metadata output device registered as video42
vivid-009: V4L2 touch capture device registered as v4l-touch9
vivid-010: using single planar format API
vivid-010: CEC adapter cec20 registered for HDMI input 0
vivid-010: V4L2 capture device registered as video43
vivid-010: CEC adapter cec21 registered for HDMI output 0
vivid-010: V4L2 output device registered as video44
vivid-010: V4L2 capture device registered as vbi20, supports raw and sliced VBI
vivid-010: V4L2 output device registered as vbi21, supports raw and sliced VBI
vivid-010: V4L2 capture device registered as swradio10
vivid-010: V4L2 receiver device registered as radio20
vivid-010: V4L2 transmitter device registered as radio21
vivid-010: V4L2 metadata capture device registered as video45
vivid-010: V4L2 metadata output device registered as video46
vivid-010: V4L2 touch capture device registered as v4l-touch10
vivid-011: using multiplanar format API
vivid-011: CEC adapter cec22 registered for HDMI input 0
vivid-011: V4L2 capture device registered as video47
vivid-011: CEC adapter cec23 registered for HDMI output 0
vivid-011: V4L2 output device registered as video48
vivid-011: V4L2 capture device registered as vbi22, supports raw and sliced VBI
vivid-011: V4L2 output device registered as vbi23, supports raw and sliced VBI
vivid-011: V4L2 capture device registered as swradio11
vivid-011: V4L2 receiver device registered as radio22
vivid-011: V4L2 transmitter device registered as radio23
vivid-011: V4L2 metadata capture device registered as video49
vivid-011: V4L2 metadata output device registered as video50
vivid-011: V4L2 touch capture device registered as v4l-touch11
vivid-012: using single planar format API
vivid-012: CEC adapter cec24 registered for HDMI input 0
vivid-012: V4L2 capture device registered as video51
vivid-012: CEC adapter cec25 registered for HDMI output 0
vivid-012: V4L2 output device registered as video52
vivid-012: V4L2 capture device registered as vbi24, supports raw and sliced VBI
vivid-012: V4L2 output device registered as vbi25, supports raw and sliced VBI
vivid-012: V4L2 capture device registered as swradio12
vivid-012: V4L2 receiver device registered as radio24
vivid-012: V4L2 transmitter device registered as radio25
vivid-012: V4L2 metadata capture device registered as video53
vivid-012: V4L2 metadata output device registered as video54
vivid-012: V4L2 touch capture device registered as v4l-touch12
vivid-013: using multiplanar format API
vivid-013: CEC adapter cec26 registered for HDMI input 0
vivid-013: V4L2 capture device registered as video55
vivid-013: CEC adapter cec27 registered for HDMI output 0
vivid-013: V4L2 output device registered as video56
vivid-013: V4L2 capture device registered as vbi26, supports raw and sliced VBI
vivid-013: V4L2 output device registered as vbi27, supports raw and sliced VBI
vivid-013: V4L2 capture device registered as swradio13
vivid-013: V4L2 receiver device registered as radio26
vivid-013: V4L2 transmitter device registered as radio27
vivid-013: V4L2 metadata capture device registered as video57
vivid-013: V4L2 metadata output device registered as video58
vivid-013: V4L2 touch capture device registered as v4l-touch13
vivid-014: using single planar format API
vivid-014: CEC adapter cec28 registered for HDMI input 0
vivid-014: V4L2 capture device registered as video59
vivid-014: CEC adapter cec29 registered for HDMI output 0
vivid-014: V4L2 output device registered as video60
vivid-014: V4L2 capture device registered as vbi28, supports raw and sliced VBI
vivid-014: V4L2 output device registered as vbi29, supports raw and sliced VBI
vivid-014: V4L2 capture device registered as swradio14
vivid-014: V4L2 receiver device registered as radio28
vivid-014: V4L2 transmitter device registered as radio29
vivid-014: V4L2 metadata capture device registered as video61
vivid-014: V4L2 metadata output device registered as video62
vivid-014: V4L2 touch capture device registered as v4l-touch14
vivid-015: using multiplanar format API
vivid-015: CEC adapter cec30 registered for HDMI input 0
vivid-015: V4L2 capture device registered as video63
vivid-015: CEC adapter cec31 registered for HDMI output 0
vivid-015: V4L2 output device registered as video64
vivid-015: V4L2 capture device registered as vbi30, supports raw and sliced VBI
vivid-015: V4L2 output device registered as vbi31, supports raw and sliced VBI
vivid-015: V4L2 capture device registered as swradio15
vivid-015: V4L2 receiver device registered as radio30
vivid-015: V4L2 transmitter device registered as radio31
vivid-015: V4L2 metadata capture device registered as video65
vivid-015: V4L2 metadata output device registered as video66
vivid-015: V4L2 touch capture device registered as v4l-touch15
vim2m vim2m.0: Device registered as /dev/video67
vicodec vicodec.0: Device 'stateful-encoder' registered as /dev/video68
vicodec vicodec.0: Device 'stateful-decoder' registered as /dev/video69
vicodec vicodec.0: Device 'stateless-decoder' registered as /dev/video70
iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
iTCO_vendor_support: vendor-support=0
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.42.0-ioctl (2020-02-27) initialised: dm-devel@redhat.com
device-mapper: multipath round-robin: version 1.2.0 loaded
device-mapper: multipath queue-length: version 0.2.0 loaded
device-mapper: multipath service-time: version 0.3.0 loaded
device-mapper: raid: Loading target version 1.15.1
Bluetooth: HCI UART driver ver 2.3
Bluetooth: HCI UART protocol H4 registered
Bluetooth: HCI UART protocol BCSP registered
Bluetooth: HCI UART protocol LL registered
Bluetooth: HCI UART protocol Three-wire (H5) registered
Bluetooth: HCI UART protocol QCA registered
Bluetooth: HCI UART protocol AG6XX registered
Bluetooth: HCI UART protocol Marvell registered
usbcore: registered new interface driver bfusb
usbcore: registered new interface driver btusb
CAPI 2.0 started up with major 68 (middleware)
Modular ISDN core version 1.1.29
NET: Registered protocol family 34
DSP module 2.0
mISDN_dsp: DSP clocks every 80 samples. This equals 1 jiffies.
mISDN: Layer-1-over-IP driver Rev. 2.00
0 virtual devices registered
intel_pstate: CPU model not supported
usnic_verbs: Cisco VIC (USNIC) Verbs Driver v1.0.3 (December 19, 2013)
usnic_verbs:usnic_uiom_init:563:
IOMMU required but not present or enabled. USNIC QPs will not function w/o enabling IOMMU
usnic_verbs:usnic_ib_init:667:
Unable to initialize umem with err -1
iscsi: registered transport (iser)
SoftiWARP attached
Driver 'framebuffer' was unable to register with bus_type 'coreboot' because the bus was not initialized.
Driver 'memconsole' was unable to register with bus_type 'coreboot' because the bus was not initialized.
Driver 'vpd' was unable to register with bus_type 'coreboot' because the bus was not initialized.
hid: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
ashmem: initialized
usbcore: registered new interface driver snd-usb-audio
drop_monitor: Initializing network drop monitor service
NET: Registered protocol family 26
GACT probability on
Mirror/redirect action on
Simple TC action Loaded
netem: version 1.3
u32 classifier
Performance counters on
input device check on
Actions configured
nf_conntrack_irc: failed to register helpers
nf_conntrack_sane: failed to register helpers
nf_conntrack_sip: failed to register helpers
xt_time: kernel timezone is -0000
IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP)
IPVS: Connection hash table configured (size=4096, memory=64Kbytes)
IPVS: ipvs loaded.
IPVS: [rr] scheduler registered.
IPVS: [wrr] scheduler registered.
IPVS: [lc] scheduler registered.
IPVS: [wlc] scheduler registered.
IPVS: [fo] scheduler registered.
IPVS: [ovf] scheduler registered.
IPVS: [lblc] scheduler registered.
IPVS: [lblcr] scheduler registered.
IPVS: [dh] scheduler registered.
IPVS: [sh] scheduler registered.
IPVS: [mh] scheduler registered.
IPVS: [sed] scheduler registered.
IPVS: [nq] scheduler registered.
IPVS: ftp: loaded support on port[0] = 21
IPVS: [sip] pe registered.
ipip: IPv4 and MPLS over IPv4 tunneling driver
gre: GRE over IPv4 demultiplexor driver
ip_gre: GRE over IPv4 tunneling driver
IPv4 over IPsec tunneling driver
ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully
Initializing XFRM netlink socket
IPsec XFRM device driver
NET: Registered protocol family 10

=============================
WARNING: suspicious RCU usage
5.7.0-rc3-next-20200428-syzkaller #0 Not tainted
-----------------------------
net/ipv6/ip6mr.c:124 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by swapper/0/1:
#0: ffffffff8a5a6330 (pernet_ops_rwsem){+.+.}-{3:3}, at: register_pernet_subsys+0x16/0x40 net/core/net_namespace.c:1257

stack backtrace:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc3-next-20200428-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
ip6mr_get_table+0x153/0x180 net/ipv6/ip6mr.c:124
ip6mr_new_table+0x1b/0x70 net/ipv6/ip6mr.c:382
ip6mr_rules_init net/ipv6/ip6mr.c:236 [inline]
ip6mr_net_init+0x133/0x3f0 net/ipv6/ip6mr.c:1310
ops_init+0xaf/0x420 net/core/net_namespace.c:151
__register_pernet_operations net/core/net_namespace.c:1140 [inline]
register_pernet_operations+0x346/0x840 net/core/net_namespace.c:1217
register_pernet_subsys+0x25/0x40 net/core/net_namespace.c:1258
ip6_mr_init+0x49/0x152 net/ipv6/ip6mr.c:1363
inet6_init+0x1d7/0x6dc net/ipv6/af_inet6.c:1032
do_one_initcall+0x10a/0x7d0 init/main.c:1159
do_initcall_level init/main.c:1232 [inline]
do_initcalls init/main.c:1248 [inline]
do_basic_setup init/main.c:1268 [inline]
kernel_init_freeable+0x501/0x5ae init/main.c:1454
kernel_init+0xd/0x1bb init/main.c:1359
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Segment Routing with IPv6
mip6: Mobile IPv6
sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
ip6_gre: GRE over IPv6 tunneling driver
NET: Registered protocol family 17
NET: Registered protocol family 15
Bridge firewalling registered
NET: Registered protocol family 9
X25: Linux Version 0.2
NET: Registered protocol family 6
NET: Registered protocol family 11
NET: Registered protocol family 3
can: controller area network core (rev 20170425 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20170425)
can: broadcast manager protocol (rev 20170425 t)
can: netlink gateway (rev 20190810) max_hops=1
can: SAE J1939
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: BNEP socket layer initialized
Bluetooth: CMTP (CAPI Emulation) ver 1.0
Bluetooth: CMTP socket layer initialized
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Bluetooth: HIDP socket layer initialized
RPC: Registered rdma transport module.
RPC: Registered rdma backchannel transport module.
NET: Registered protocol family 33
Key type rxrpc registered
Key type rxrpc_s registered
NET: Registered protocol family 41
lec:lane_module_init: lec.c: initialized
mpoa:atm_mpoa_init: mpc.c: initialized
l2tp_core: L2TP core driver, V2.0
l2tp_ppp: PPPoL2TP kernel driver, V2.0
l2tp_ip: L2TP IP encapsulation support (L2TPv3)
l2tp_netlink: L2TP netlink interface
l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
NET: Registered protocol family 35
8021q: 802.1Q VLAN Support v1.8
DCCP: Activated CCID 2 (TCP-like)
DCCP: Activated CCID 3 (TCP-Friendly Rate Control)
sctp: Hash tables configured (bind 32/56)
NET: Registered protocol family 21
Registered RDS/infiniband transport
Registered RDS/tcp transport
tipc: Activated (version 2.0.0)
NET: Registered protocol family 30
tipc: Started in single node mode
NET: Registered protocol family 43
9pnet: Installing 9P2000 support
NET: Registered protocol family 37
NET: Registered protocol family 36
Key type dns_resolver registered
Key type ceph registered
libceph: loaded (mon/osd proto 15/24)
batman_adv: B.A.T.M.A.N. advanced 2020.2 (compatibility version 15) loaded
openvswitch: Open vSwitch switching datapath
NET: Registered protocol family 40
mpls_gso: MPLS GSO support
IPI shorthand broadcast: enabled
AVX2 version of gcm_enc/dec engaged.
AES CTR mode by8 optimization enabled
sched_clock: Marking stable (17444721508, 31811971)->(17487974339, -11440860)
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: 8b22f477d966bfa6cf9a482acbda6ca1892a4acc'
zswap: loaded using pool lzo/zbud
debug_vm_pgtable: debug_vm_pgtable: Validating architecture page table helpers
Key type ._fscrypt registered
Key type .fscrypt registered
Key type fscrypt-provisioning registered
kAFS: Red Hat AFS client v0.1 registering.
FS-Cache: Netfs 'afs' registered for caching
Btrfs loaded, crc32c=crc32c-intel
Key type big_key registered
Key type encrypted registered
AppArmor: AppArmor sha1 policy hashing enabled
ima: No TPM chip found, activating TPM-bypass!
ima: Allocated hash algorithm: sha256
ima: No architecture policies found
evm: Initialising EVM extended attributes:
evm: security.selinux
evm: security.SMACK64
evm: security.SMACK64EXEC
evm: security.SMACK64TRANSMUTE
evm: security.SMACK64MMAP
evm: security.apparmor
evm: security.ima
evm: security.capability
evm: HMAC attrs: 0x1
PM: Magic number: 0:864:473
printk: console [netcon0] enabled
netconsole: network logging started
gtp: GTP module loaded (pdp ctx size 104 bytes)
rdma_rxe: loaded
cfg80211: Loading compiled-in X.509 certificates for regulatory database
cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
ALSA device list:
#0: Dummy 1
#1: Loopback 1
#2: Virtual MIDI Card 1
md: Waiting for all devices to be available before autodetect
md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
EXT4-fs (sda1): mounted filesystem without journal. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
devtmpfs: mounted
Freeing unused kernel image (initmem) memory: 2776K
Kernel memory protection disabled.
Run /sbin/init as init process
random: systemd: uninitialized urandom read (16 bytes read)
random: systemd: uninitialized urandom read (16 bytes read)
random: systemd: uninitialized urandom read (16 bytes read)
systemd[1]: systemd 232 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
systemd[1]: Detected virtualization kvm.
systemd[1]: Detected architecture x86-64.
systemd[1]: Set hostname to <syzkaller>.
systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
systemd[1]: Reached target Remote File Systems.
systemd[1]: Listening on Syslog Socket.
systemd[1]: Listening on Journal Socket.
systemd[1]: Listening on udev Kernel Socket.

=============================
WARNING: suspicious RCU usage
5.7.0-rc3-next-20200428-syzkaller #0 Not tainted
-----------------------------
security/integrity/evm/evm_main.c:231 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
2 locks held by systemd/1:
#0: ffff888098dfa450 (sb_writers#8){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1659 [inline]
#0: ffff888098dfa450 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:354
#1: ffff8880988e8310 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
#1: ffff8880988e8310 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: vfs_setxattr+0x92/0xf0 fs/xattr.c:219

stack backtrace:
CPU: 0 PID: 1 Comm: systemd Not tainted 5.7.0-rc3-next-20200428-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
evm_protected_xattr+0x1c2/0x210 security/integrity/evm/evm_main.c:231
evm_protect_xattr.isra.0+0xb6/0x3d0 security/integrity/evm/evm_main.c:318
evm_inode_setxattr+0xc4/0xf0 security/integrity/evm/evm_main.c:387
security_inode_setxattr+0x18f/0x200 security/security.c:1297
vfs_setxattr+0xa7/0xf0 fs/xattr.c:220
setxattr+0x23d/0x330 fs/xattr.c:451
path_setxattr+0x170/0x190 fs/xattr.c:470
__do_sys_setxattr fs/xattr.c:485 [inline]
__se_sys_setxattr fs/xattr.c:481 [inline]
__x64_sys_setxattr+0xc0/0x160 fs/xattr.c:481
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7fe46005e67a
Code: 48 8b 0d 21 18 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 bc 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ee 17 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fffef423568 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe46005e67a
RDX: 00007fffef4235e0 RSI: 0000556ea53ddf9b RDI: 0000556ea6766760
RBP: 0000556ea53ddf9b R08: 0000000000000000 R09: 0000000000000030
R10: 0000000000000020 R11: 0000000000000246 R12: 00007fffef4235e0
R13: 0000000000000020 R14: 0000000000000000 R15: 0000556ea6751700

=============================
WARNING: suspicious RCU usage
5.7.0-rc3-next-20200428-syzkaller #0 Not tainted
-----------------------------
security/device_cgroup.c:357 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
4 locks held by systemd/1:
#0: ffff8880984f6450 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2910 [inline]
#0: ffff8880984f6450 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x4cf/0x5d0 fs/read_write.c:558
#1: ffff8880a93c4888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write+0x1b8/0x490 fs/kernfs/file.c:306
#2: ffff888096d1f4d0 (kn->active#47){++++}-{0:0}, at: kernfs_fop_write+0x1db/0x490 fs/kernfs/file.c:307
#3: ffffffff89e5de48 (devcgroup_mutex){+.+.}-{3:3}, at: devcgroup_access_write+0x93/0x12a7 security/device_cgroup.c:762

stack backtrace:
CPU: 1 PID: 1 Comm: systemd Not tainted 5.7.0-rc3-next-20200428-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
match_exception_partial+0x2ee/0x340 security/device_cgroup.c:357
verify_new_ex+0x176/0x3a0 security/device_cgroup.c:414
parent_has_perm security/device_cgroup.c:456 [inline]
devcgroup_update_access security/device_cgroup.c:731 [inline]
devcgroup_access_write+0xaf5/0x12a7 security/device_cgroup.c:763
cgroup_file_write+0x20d/0x710 kernel/cgroup/cgroup.c:3704
kernfs_fop_write+0x268/0x490 fs/kernfs/file.c:315
__vfs_write+0x76/0x100 fs/read_write.c:495
vfs_write+0x268/0x5d0 fs/read_write.c:559
ksys_write+0x12d/0x250 fs/read_write.c:612
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7fe460052970
Code: 73 01 c3 48 8b 0d 28 d5 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 99 2d 2c 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 7e 9b 01 00 48 89 04 24
RSP: 002b:00007fffef423128 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007fe460052970
RDX: 000000000000000a RSI: 0000556ea6787c30 RDI: 0000000000000027
RBP: 0000556ea6787c30 R08: 0000556ea67af200 R09: 00007fe461a88500
R10: 0000000000000073 R11: 0000000000000246 R12: 000000000000000a
R13: 0000000000000001 R14: 0000556ea67af120 R15: 000000000000000a

---
This bug is generated by a bot. It may contain errors.
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