[2J[01;01H[=3h[2J[01;01H[0m[35m[40m[0m[37m[40mEFI stub: Entering in SVC mode with MMU enabled EFI stub: Booting Linux Kernel... EFI stub: Using DTB from configuration table EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path EFI stub: Exiting boot services and installing virtual address map... [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.10.209-cip44 (KernelCI@build-j98842-arm-gcc-10-multi-v7-defconfig-xc6jq) (arm-linux-gnueabihf-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Mon Feb 5 14:23:37 UTC 2024 [ 0.000000] CPU: ARMv7 Processor [414fc0f0] revision 0 (ARMv7), cr=10c5387d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache [ 0.000000] OF: fdt: Machine model: linux,dummy-virt [ 0.000000] random: crng init done [ 0.000000] earlycon: pl11 at MMIO 0x09000000 (options '') [ 0.000000] printk: bootconsole [pl11] enabled [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] efi: EFI v2.70 by EDK II [ 0.000000] efi: SMBIOS=0x5fb78000 SMBIOS 3.0=0x5fb76000 MEMATTR=0x5e14fa90 MEMRESERVE=0x5c6eae90 [ 0.000000] cma: Reserved 64 MiB at 0x56800000 [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000040000000-0x000000005fffffff] [ 0.000000] Normal empty [ 0.000000] HighMem empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000040000000-0x000000005f9c6fff] [ 0.000000] node 0: [mem 0x000000005f9c7000-0x000000005fb88fff] [ 0.000000] node 0: [mem 0x000000005fb89000-0x000000005fffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000040000000-0x000000005fffffff] [ 0.000000] On node 0 totalpages: 131072 [ 0.000000] DMA zone: 1024 pages used for memmap [ 0.000000] DMA zone: 0 pages reserved [ 0.000000] DMA zone: 131072 pages, LIFO batch:31 [ 0.000000] psci: probing for conduit method from DT. [ 0.000000] psci: PSCIv1.1 detected in firmware. [ 0.000000] psci: Using standard PSCI v0.2 function IDs [ 0.000000] psci: Trusted OS migration not required [ 0.000000] psci: SMC Calling Convention v1.0 [ 0.000000] percpu: Embedded 20 pages/cpu s49868 r8192 d23860 u81920 [ 0.000000] pcpu-alloc: s49868 r8192 d23860 u81920 alloc=20*4096 [ 0.000000] pcpu-alloc: [0] 0 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 130048 [ 0.000000] Kernel command line: console=ttyAMA0,115200 root=/dev/ram0 debug verbose console_msg_format=syslog earlycon deferred_probe_timeout=60 initrd=initrd <6>[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear) <6>[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear) <6>[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off <6>[ 0.000000] Memory: 419272K/524288K available (14336K kernel code, 2239K rwdata, 5364K rodata, 2048K init, 424K bss, 39480K reserved, 65536K cma-reserved, 0K highmem) <6>[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 <6>[ 0.000000] rcu: Hierarchical RCU implementation. <6>[ 0.000000] rcu: RCU event tracing is enabled. <6>[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=1. <6>[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. <6>[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1 <6>[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 <6>[ 0.000000] GICv2m: range[mem 0x08020000-0x08020fff], SPI[80:143] <6>[ 0.000000] arch_timer: cp15 timer(s) running at 62.50MHz (virt). <6>[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1cd42e208c, max_idle_ns: 881590405314 ns <6>[ 0.000158] sched_clock: 56 bits at 62MHz, resolution 16ns, wraps every 4398046511096ns <6>[ 0.000573] Switching to timer-based delay loop, resolution 16ns <6>[ 0.004751] Console: colour dummy device 80x30 <6>[ 0.006094] Calibrating delay loop (skipped), value calculated using timer frequency.. 125.00 BogoMIPS (lpj=625000) <6>[ 0.006471] CPU: Testing write buffer coherency: ok <3>[ 0.007711] CPU0: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable <6>[ 0.008184] CPU0: Spectre BHB: enabling loop workaround for all CPUs <6>[ 0.008468] pid_max: default: 32768 minimum: 301 <6>[ 0.011770] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear) <6>[ 0.011982] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear) <3>[ 0.028874] /cpus/cpu@0 missing clock-frequency property <6>[ 0.029228] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 <6>[ 0.033776] Setting up static identity map for 0x40300000 - 0x403000ac <6>[ 0.035473] rcu: Hierarchical SRCU implementation. <6>[ 0.039117] Remapping and enabling EFI services. <6>[ 0.040802] smp: Bringing up secondary CPUs ... <6>[ 0.041147] smp: Brought up 1 node, 1 CPU <6>[ 0.041344] SMP: Total of 1 processors activated (125.00 BogoMIPS). <6>[ 0.041582] CPU: All CPU(s) started in SVC mode. <6>[ 0.048982] devtmpfs: initialized <6>[ 0.056274] VFP support v0.3: implementor 41 architecture 4 part 30 variant f rev 0 <6>[ 0.070686] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns <6>[ 0.071656] futex hash table entries: 256 (order: 2, 16384 bytes, linear) <6>[ 0.076263] pinctrl core: initialized pinctrl subsystem <6>[ 0.089963] SMBIOS 3.0.0 present. <6>[ 0.090276] DMI: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 <6>[ 0.095786] NET: Registered protocol family 16 <6>[ 0.111313] DMA: preallocated 256 KiB pool for atomic coherent allocations <6>[ 0.115912] thermal_sys: Registered thermal governor 'step_wise' <6>[ 0.116224] cpuidle: using governor menu <6>[ 0.116746] No ATAGs? <6>[ 0.117814] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers. <6>[ 0.118048] hw-breakpoint: maximum watchpoint size is 8 bytes. <6>[ 0.121559] Serial: AMBA PL011 UART driver <6>[ 0.156983] 9000000.pl011: ttyAMA0 at MMIO 0x9000000 (irq = 61, base_baud = 0) is a PL011 rev1 <6>[ 0.158280] printk: console [ttyAMA0] enabled <6>[ 0.158280] printk: console [ttyAMA0] enabled <6>[ 0.158635] printk: bootconsole [pl11] disabled <6>[ 0.158635] printk: bootconsole [pl11] disabled <6>[ 0.192993] iommu: Default domain type: Translated <6>[ 0.193695] vgaarb: loaded <5>[ 0.195585] SCSI subsystem initialized <7>[ 0.197333] libata version 3.00 loaded. <6>[ 0.198248] usbcore: registered new interface driver usbfs <6>[ 0.198499] usbcore: registered new interface driver hub <6>[ 0.198712] usbcore: registered new device driver usb <6>[ 0.200324] pps_core: LinuxPPS API ver. 1 registered <6>[ 0.200430] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <6>[ 0.200648] PTP clock support registered <6>[ 0.202057] Registered efivars operations <6>[ 0.214904] clocksource: Switched to clocksource arch_sys_counter <6>[ 0.971387] NET: Registered protocol family 2 <6>[ 0.972739] IP idents hash table entries: 8192 (order: 4, 65536 bytes, linear) <6>[ 0.976481] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear) <6>[ 0.976865] TCP established hash table entries: 4096 (order: 2, 16384 bytes, linear) <6>[ 0.977272] TCP bind hash table entries: 4096 (order: 3, 32768 bytes, linear) <6>[ 0.977686] TCP: Hash tables configured (established 4096 bind 4096) <6>[ 0.978943] UDP hash table entries: 256 (order: 1, 8192 bytes, linear) <6>[ 0.979260] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear) <6>[ 0.980316] NET: Registered protocol family 1 <6>[ 0.982714] RPC: Registered named UNIX socket transport module. <6>[ 0.982886] RPC: Registered udp transport module. <6>[ 0.983029] RPC: Registered tcp transport module. <6>[ 0.983185] RPC: Registered tcp NFSv4.1 backchannel transport module. <6>[ 0.983540] PCI: CLS 0 bytes, default 64 <6>[ 0.986748] Trying to unpack rootfs image as initramfs... <6>[ 1.409459] Freeing initrd memory: 7704K <5>[ 1.411768] Initialise system trusted keyrings <6>[ 1.413353] workingset: timestamp_bits=30 max_order=17 bucket_order=0 <6>[ 1.421294] squashfs: version 4.0 (2009/01/31) Phillip Lougher <5>[ 1.423236] NFS: Registering the id_resolver key type <5>[ 1.423683] Key type id_resolver registered <5>[ 1.423838] Key type id_legacy registered <6>[ 1.424274] nfs4filelayout_init: NFSv4 File Layout Driver Registering... <6>[ 1.424523] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering... <6>[ 1.424974] ntfs: driver 2.1.32 [Flags: R/O]. <5>[ 1.425957] Key type asymmetric registered <5>[ 1.426101] Asymmetric key parser 'x509' registered <6>[ 1.426388] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247) <6>[ 1.426648] io scheduler mq-deadline registered <6>[ 1.426854] io scheduler kyber registered <6>[ 1.441196] pl061_gpio 9030000.pl061: PL061 GPIO chip registered <6>[ 1.445956] pci-host-generic 3f000000.pcie: host bridge /pcie@10000000 ranges: <6>[ 1.448121] pci-host-generic 3f000000.pcie: IO 0x003eff0000..0x003effffff -> 0x0000000000 <6>[ 1.448706] pci-host-generic 3f000000.pcie: MEM 0x0010000000..0x003efeffff -> 0x0010000000 <6>[ 1.448980] pci-host-generic 3f000000.pcie: MEM 0x8000000000..0xffffffffff -> 0x8000000000 <6>[ 1.450808] pci-host-generic 3f000000.pcie: ECAM at [mem 0x3f000000-0x3fffffff] for [bus 00-0f] <6>[ 1.451697] pci-host-generic 3f000000.pcie: PCI host bridge to bus 0000:00 <6>[ 1.451996] pci_bus 0000:00: root bus resource [bus 00-0f] <6>[ 1.452269] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] <6>[ 1.452393] pci_bus 0000:00: root bus resource [mem 0x10000000-0x3efeffff] <6>[ 1.453591] pci 0000:00:00.0: [1b36:0008] type 00 class 0x060000 <6>[ 1.455851] pci 0000:00:01.0: [1af4:1000] type 00 class 0x020000 <6>[ 1.456232] pci 0000:00:01.0: reg 0x10: [io 0x0040-0x005f] <6>[ 1.456370] pci 0000:00:01.0: reg 0x14: [mem 0x10049000-0x10049fff] <6>[ 1.456696] pci 0000:00:01.0: reg 0x20: [mem 0x10044000-0x10047fff 64bit pref] <6>[ 1.456936] pci 0000:00:01.0: reg 0x30: [mem 0xfffc0000-0xffffffff pref] <6>[ 1.457349] pci 0000:00:02.0: [1af4:1001] type 00 class 0x010000 <6>[ 1.457515] pci 0000:00:02.0: reg 0x10: [io 0x0000-0x003f] <6>[ 1.457669] pci 0000:00:02.0: reg 0x14: [mem 0x10048000-0x10048fff] <6>[ 1.457820] pci 0000:00:02.0: reg 0x20: [mem 0x10040000-0x10043fff 64bit pref] <6>[ 1.459040] PCI: bus0: Fast back to back transfers disabled <6>[ 1.460076] pci 0000:00:01.0: BAR 6: assigned [mem 0x10000000-0x1003ffff pref] <6>[ 1.460418] pci 0000:00:01.0: BAR 4: assigned [mem 0x10040000-0x10043fff 64bit pref] <6>[ 1.460759] pci 0000:00:02.0: BAR 4: assigned [mem 0x10044000-0x10047fff 64bit pref] <6>[ 1.460964] pci 0000:00:01.0: BAR 1: assigned [mem 0x10048000-0x10048fff] <6>[ 1.461119] pci 0000:00:02.0: BAR 1: assigned [mem 0x10049000-0x10049fff] <6>[ 1.461314] pci 0000:00:02.0: BAR 0: assigned [io 0x1000-0x103f] <6>[ 1.461499] pci 0000:00:01.0: BAR 0: assigned [io 0x1040-0x105f] <6>[ 1.475260] virtio-pci 0000:00:01.0: enabling device (0100 -> 0103) <6>[ 1.477203] virtio-pci 0000:00:02.0: enabling device (0100 -> 0103) <6>[ 1.530362] Serial: 8250/16550 driver, 5 ports, IRQ sharing enabled <6>[ 1.534652] SuperH (H)SCI(F) driver initialized <6>[ 1.535676] msm_serial: driver initialized <6>[ 1.535946] STMicroelectronics ASC driver initialized <6>[ 1.537110] STM32 USART driver initialized <6>[ 1.561492] brd: module loaded <6>[ 1.570945] loop: module loaded <5>[ 1.577747] virtio_blk virtio1: [vda] 1048576 512-byte logical blocks (537 MB/512 MiB) <6>[ 1.578029] vda: detected capacity change from 0 to 536870912 <5>[ 1.593264] physmap-flash 0.flash: physmap platform flash device: [mem 0x00000000-0x03ffffff] <6>[ 1.594599] 0.flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000000 Chip ID 0x000000 <6>[ 1.595154] Intel/Sharp Extended Query Table at 0x0031 <6>[ 1.595735] Using buffer write method <7>[ 1.596103] erase region 0: offset=0x0,size=0x40000,blocks=256 <5>[ 1.597467] physmap-flash 0.flash: physmap platform flash device: [mem 0x04000000-0x07ffffff] <6>[ 1.598033] 0.flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000000 Chip ID 0x000000 <6>[ 1.598304] Intel/Sharp Extended Query Table at 0x0031 <6>[ 1.598742] Using buffer write method <7>[ 1.598872] erase region 0: offset=0x0,size=0x40000,blocks=256 <5>[ 1.599078] Concatenating MTD devices: <5>[ 1.599200] (0): \"0.flash\" <5>[ 1.599309] (1): \"0.flash\" <5>[ 1.599398] into device \"0.flash\" <6>[ 1.683006] CAN device driver interface <6>[ 1.684042] bgmac_bcma: Broadcom 47xx GBit MAC driver loaded <6>[ 1.685111] e1000e: Intel(R) PRO/1000 Network Driver <6>[ 1.685218] e1000e: Copyright(c) 1999 - 2015 Intel Corporation. <6>[ 1.685432] igb: Intel(R) Gigabit Ethernet Network Driver <6>[ 1.685574] igb: Copyright (c) 2007-2014 Intel Corporation. <6>[ 1.689221] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver <6>[ 1.689477] usbcore: registered new interface driver pegasus <6>[ 1.689695] usbcore: registered new interface driver asix <6>[ 1.689904] usbcore: registered new interface driver ax88179_178a <6>[ 1.690157] usbcore: registered new interface driver cdc_ether <6>[ 1.690351] usbcore: registered new interface driver smsc75xx <6>[ 1.690552] usbcore: registered new interface driver smsc95xx <6>[ 1.690751] usbcore: registered new interface driver net1080 <6>[ 1.690969] usbcore: registered new interface driver cdc_subset <6>[ 1.691174] usbcore: registered new interface driver zaurus <6>[ 1.691437] usbcore: registered new interface driver cdc_ncm <6>[ 1.693864] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver <6>[ 1.694064] ehci-pci: EHCI PCI platform driver <6>[ 1.694326] ehci-platform: EHCI generic platform driver <6>[ 1.694677] ehci-orion: EHCI orion driver <6>[ 1.694960] SPEAr-ehci: EHCI SPEAr driver <6>[ 1.695209] ehci-st: EHCI STMicroelectronics driver <6>[ 1.695448] ehci-exynos: EHCI Exynos driver <6>[ 1.695686] ehci-atmel: EHCI Atmel driver <6>[ 1.695942] tegra-ehci: Tegra EHCI driver <6>[ 1.696225] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver <6>[ 1.696426] ohci-pci: OHCI PCI platform driver <6>[ 1.696694] ohci-platform: OHCI generic platform driver <6>[ 1.697014] SPEAr-ohci: OHCI SPEAr driver <6>[ 1.697234] ohci-st: OHCI STMicroelectronics driver <6>[ 1.697517] ohci-atmel: OHCI Atmel driver <6>[ 1.698609] usbcore: registered new interface driver usb-storage <6>[ 1.703247] i2c /dev entries driver <6>[ 1.714217] sdhci: Secure Digital Host Controller Interface driver <6>[ 1.714390] sdhci: Copyright(c) Pierre Ossman <6>[ 1.715991] Synopsys Designware Multimedia Card Interface Driver <6>[ 1.717251] sdhci-pltfm: SDHCI platform and OF driver helper <6>[ 1.720594] ledtrig-cpu: registered to indicate activity on CPUs <6>[ 1.724154] pstore: Registered efi as persistent store backend <6>[ 1.725154] usbcore: registered new interface driver usbhid <6>[ 1.725325] usbhid: USB HID core driver <6>[ 1.729902] NET: Registered protocol family 10 <6>[ 1.734943] Segment Routing with IPv6 <6>[ 1.735374] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver <6>[ 1.737490] NET: Registered protocol family 17 <6>[ 1.737703] can: controller area network core <6>[ 1.738107] NET: Registered protocol family 29 <6>[ 1.738223] can: raw protocol <6>[ 1.738376] can: broadcast manager protocol <6>[ 1.738549] can: netlink gateway - max_hops=1 <5>[ 1.739358] Key type dns_resolver registered <6>[ 1.739692] ThumbEE CPU extension supported. <5>[ 1.739841] Registering SWP/SWPB emulation handler <5>[ 1.740882] Loading compiled-in X.509 certificates <6>[ 1.746112] pstore: Using crash dump compression: deflate <6>[ 1.752887] input: gpio-keys as /devices/platform/gpio-keys/input/input0 <6>[ 1.757693] uart-pl011 9000000.pl011: no DMA platform data <6>[ 1.827208] Freeing unused kernel memory: 2048K <6>[ 1.850155] Run /init as init process <7>[ 1.850284] with arguments: <7>[ 1.850411] /init <7>[ 1.850505] verbose <7>[ 1.850616] with environment: <7>[ 1.850748] HOME=/ <7>[ 1.850835] TERM=linux Starting syslogd: OK Starting klogd: OK Running sysctl: OK Populating /dev using udev: <30>[ 2.316714] udevd[75]: starting version 3.2.9 <27>[ 2.357470] udevd[75]: specified user 'tss' unknown <27>[ 2.360127] udevd[75]: specified group 'tss' unknown <30>[ 2.370830] udevd[76]: starting eudev-3.2.9 done Saving random seed: OK Starting network: OK Starting dropbear sshd: OK /bin/sh: can't access tty; job control turned off / # / # # # / # mkdir /lava-545314 mkdir /lava-545314 / # mount /dev/disk/by-uuid/a69cc265-9b70-45dc-b38d-4e2ec2237e9e -t ext2 /lava-545314 mount /dev/disk/by-uuid/a69cc265-9b70-45dc-b38d-4e2ec2237e9e -t ext2 /lava-5 45314 <6>[ 8.063092] EXT4-fs (vda): mounting ext2 file system using the ext4 subsystem <6>[ 8.116823] EXT4-fs (vda): mounted filesystem without journal. Opts: (null) / # ls -la /lava-545314/bin/lava-test-runner ls -la /lava-545314/bin/lava-test-runner -rwxr-xr-x 1 root root 1039 Feb 5 2024 [1;32m/lava-545314/bin/lava-test-runner[m / # export SHELL=/bin/sh export SHELL=/bin/sh / # . /lava-545314/environment . /lava-545314/environment / # /lava-545314/bin/lava-test-runner /lava-545314/0 /lava-545314/bin/lava-test-runner /lava-545314/0 + export 'TESTRUN_ID=0_dmesg' + cd /lava-545314/0/tests/0_dmesg + cat uuid + UUID=545314_1.1.3.1 + set +x <8>[ 8.774929] + KERNELCI_LAVA=y /bin/sh /opt/kernelci/dmesg.sh <8>[ 8.868994] <8>[ 8.945093] <8>[ 9.017837] + set +x <8>[ 9.020804] # / # #mkdir /lava-545314 / # mkdir /lava-545314mount /dev/disk/by-uuid/a69cc265-9b70-45dc-b38d-4e2ec2237e9e -t ext2 /lava-545314 mkdir: can't create directory '/lava-545314': File exists / # mount /dev/disk/by-uuid/a69cc265-9b70-45dc-b38d-4e2ec2237e9e -t ext2 /lava-5 45314ls -la /lava-545314/bin/lava-test-runner mount: mounting /dev/disk/by-uuid/a69cc265-9b70-45dc-b38d-4e2ec2237e9e on /lava-545314 failed: Device or resource busy / # ls -la /lava-545314/bin/lava-test-runnerexport SHELL=/bin/sh -rwxr-xr-x 1 root root 1039 Feb 5 2024 [1;32m/lava-545314/bin/lava-test-runner[m / # export SHELL=/bin/sh. /lava-545314/environment / # . /lava-545314/environment/lava-545314/bin/lava-test-runner /lava-545314/1 / # /lava-545314/bin/lava-test-runner /lava-545314/1 + export 'TESTRUN_ID=1_bootrr' + cd /lava-545314/1/tests/1_bootrr + cat uuid + UUID=545314_1.1.3.5 + set +x <8>[ 9.901602] + export 'PATH=/opt/bootrr/libexec/bootrr/helpers:/lava-545314/1/../bin:/sbin:/usr/sbin:/bin:/usr/bin' + cd /opt/bootrr/libexec/bootrr + sh helpers/bootrr-auto /lava-545314/1/../bin/lava-test-case <8>[ 10.002080] /lava-545314/1/../bin/lava-test-case <8>[ 10.069788] /lava-545314/1/../bin/lava-test-case <8>[ 10.108936] + set +x <8>[ 10.159572] / # poweroff poweroff