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Message-ID: <CAKv+Gu9P4_90LEoyu1apeKZH20imLPD_EiB=zNAvyin-67ivKQ@mail.gmail.com>
Date: Sat, 10 Sep 2016 11:56:14 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Catalin Marinas <catalin.marinas@....com>
Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Kees Cook <keescook@...omium.org>,
kernel-hardening@...ts.openwall.com, Will Deacon <will.deacon@....com>,
AKASHI Takahiro <takahiro.akashi@...aro.org>, Julien Grall <julien.grall@....com>,
James Morse <james.morse@....com>, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 0/7] arm64: Privileged Access Never using TTBR0_EL1 switching
On 10 September 2016 at 10:51, Catalin Marinas <catalin.marinas@....com> wrote:
> On Fri, Sep 02, 2016 at 04:02:06PM +0100, Catalin Marinas wrote:
>> This is the second version of the arm64 PAN emulation by disabling
>> TTBR0_EL1 accesses. The major change from v1 is the use of a thread_info
>> member to store the real TTBR0_EL1 value. The advantage is slightly
>> simpler assembler macros for uaccess_enable with the downside that
>> switch_mm() must always update the saved ttbr0 even if there is no mm
>> switch.
>
> FYI, I got the Juno board rebooting in a loop with defconfig +
> ARM64_TTBR0_PAN enabled. It takes about 20-40 reboots to get the panic
> below on the EFI run-time services. I'll look into it on Monday (and
> cc'ing Ard who I forgot to add originally). Including the full log
> below:
>
Hi David,
Could you please try to reproduce it again, but this time with
'efi=debug' on the kernel command line? Thanks
--
Ard.
> EFI stub: Booting Linux Kernel...
> EFI stub: Using DTB from configuration table
> EFI stub: Exiting boot services and installing virtual address map...
> [ 0.000000] Booting Linux on physical CPU 0x100
> [ 0.000000] Linux version 4.8.0-rc4-00007-g07a1ca6cb00d (cmarinas@...4818-lin) (gcc version 5.3.1 20160309 (fsf-5.264) ) #1 SMP PREEMPT Fri Sep 9 18:38:47 BST 2016
> [ 0.000000] Boot CPU: AArch64 Processor [410fd030]
> [ 0.000000] earlycon: pl11 at MMIO 0x000000007ff80000 (options '')
> [ 0.000000] bootconsole [pl11] enabled
> [ 0.000000] efi: Getting EFI parameters from FDT:
> [ 0.000000] efi: EFI v2.40 by ARM Juno EFI Oct 7 2014 15:05:42
> [ 0.000000] efi: ACPI=0xfebdc000 ACPI 2.0=0xfebdc014
> [ 0.000000] cma: Reserved 16 MiB at 0x00000000fd800000
> [ 0.000000] psci: probing for conduit method from DT.
> [ 0.000000] psci: PSCIv0.2 detected in firmware.
> [ 0.000000] psci: Using standard PSCI v0.2 function IDs
> [ 0.000000] psci: Trusted OS migration not required
> [ 0.000000] percpu: Embedded 21 pages/cpu @ffff80097fea6000 s47488 r8192 d30336 u86016
> [ 0.000000] Detected VIPT I-cache on CPU0
> [ 0.000000] CPU features: enabling workaround for ARM errata 826319, 827319, 824069
> [ 0.000000] CPU features: enabling workaround for ARM erratum 845719
> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 2060048
> [ 0.000000] Kernel command line: console=ttyAMA0,115200 earlycon=pl011,0x7ff80000 ip=dhcp root=/dev/nfs rw nfsroot=10.1.206.48:/srv/nfs/debian-arm64,tcp
> [ 0.000000] log_buf_len individual max cpu contribution: 4096 bytes
> [ 0.000000] log_buf_len total cpu_extra contributions: 20480 bytes
> [ 0.000000] log_buf_len min size: 16384 bytes
> [ 0.000000] log_buf_len: 65536 bytes
> [ 0.000000] early log buf free: 14320(87%)
> [ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
> [ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes)
> [ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes)
> [ 0.000000] software IO TLB [mem 0xf9800000-0xfd800000] (64MB) mapped at [ffff800079800000-ffff80007d7fffff]
> [ 0.000000] Memory: 8129516K/8371264K available (8636K kernel code, 796K rwdata, 3532K rodata, 960K init, 275K bss, 225364K reserved, 16384K cma-reserved)
> [ 0.000000] Virtual kernel memory layout:
> [ 0.000000] modules : 0xffff000000000000 - 0xffff000008000000 ( 128 MB)
> [ 0.000000] vmalloc : 0xffff000008000000 - 0xffff7dffbfff0000 (129022 GB)
> [ 0.000000] .text : 0xffff000008080000 - 0xffff0000088f0000 ( 8640 KB)
> [ 0.000000] .rodata : 0xffff0000088f0000 - 0xffff000008c70000 ( 3584 KB)
> [ 0.000000] .init : 0xffff000008c70000 - 0xffff000008d60000 ( 960 KB)
> [ 0.000000] .data : 0xffff000008d60000 - 0xffff000008e27200 ( 797 KB)
> [ 0.000000] .bss : 0xffff000008e27200 - 0xffff000008e6c138 ( 276 KB)
> [ 0.000000] fixed : 0xffff7dfffe7fd000 - 0xffff7dfffec00000 ( 4108 KB)
> [ 0.000000] PCI I/O : 0xffff7dfffee00000 - 0xffff7dffffe00000 ( 16 MB)
> [ 0.000000] vmemmap : 0xffff7e0000000000 - 0xffff800000000000 ( 2048 GB maximum)
> [ 0.000000] 0xffff7e0000000000 - 0xffff7e0026000000 ( 608 MB actual)
> [ 0.000000] memory : 0xffff800000000000 - 0xffff800980000000 ( 38912 MB)
> [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1
> [ 0.000000] Preemptible hierarchical RCU implementation.
> [ 0.000000] Build-time adjustment of leaf fanout to 64.
> [ 0.000000] RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=6.
> [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=6
> [ 0.000000] NR_IRQS:64 nr_irqs:64 0
> [ 0.000000] GIC: Using split EOI/Deactivate mode
> [ 0.000000] GICv2m: range[mem 0x2c1c0000-0x2c1c0fff], SPI[224:255]
> [ 0.000000] arm_arch_timer: Architected cp15 timer(s) running at 50.00MHz (phys).
> [ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xb8812736b, max_idle_ns: 440795202655 ns
> [ 0.000005] sched_clock: 56 bits at 50MHz, resolution 20ns, wraps every 4398046511100ns
> [ 0.008439] clocksource: arm,sp804: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275 ns
> [ 0.018257] Failed to initialize '/smb/motherboard/iofpga@3,00000000/timer@...000': -22
> [ 0.026339] Console: colour dummy device 80x25
> [ 0.031047] Calibrating delay loop (skipped), value calculated using timer frequency.. 100.00 BogoMIPS (lpj=200000)
> [ 0.041642] pid_max: default: 32768 minimum: 301
> [ 0.046406] Security Framework initialized
> [ 0.050607] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes)
> [ 0.057587] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes)
> [ 0.066233] ASID allocator initialised with 65536 entries
> [ 0.096367] Remapping and enabling EFI services.
> [ 0.101091] EFI remap 0x0000000008000000 => 0000000020000000
> [ 0.107016] EFI remap 0x000000001c170000 => 0000000024000000
> [ 0.112941] EFI remap 0x00000009faf6f000 => 000000002401f000
> [ 0.118865] EFI remap 0x00000009fff6e000 => 000000002406e000
> [ 0.124789] EFI remap 0x00000009fffaf000 => 00000000240af000
> [ 0.155087] Detected PIPT I-cache on CPU1
> [ 0.155092] CPU features: enabling workaround for ARM erratum 832075
> [ 0.155094] CPU features: enabling workaround for ARM erratum 834220
> [ 0.155129] CPU1: Booted secondary processor [410fd070]
> [ 0.171085] Detected PIPT I-cache on CPU2
> [ 0.171110] CPU2: Booted secondary processor [410fd070]
> [ 0.187086] Detected VIPT I-cache on CPU3
> [ 0.187127] CPU3: Booted secondary processor [410fd030]
> [ 0.203127] Detected VIPT I-cache on CPU4
> [ 0.203157] CPU4: Booted secondary processor [410fd030]
> [ 0.219170] Detected VIPT I-cache on CPU5
> [ 0.219200] CPU5: Booted secondary processor [410fd030]
> [ 0.219264] Brought up 6 CPUs
> [ 0.281960] SMP: Total of 6 processors activated.
> [ 0.286735] CPU features: detected feature: 32-bit EL0 Support
> [ 0.292670] CPU: All CPU(s) started at EL2
> [ 0.296856] alternatives: patching kernel code
> [ 0.307334] devtmpfs: initialized
> [ 0.314498] DMI not present or invalid.
> [ 0.318621] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
> [ 0.329272] pinctrl core: initialized pinctrl subsystem
> [ 0.335640] NET: Registered protocol family 16
> [ 0.364205] cpuidle: using governor menu
> [ 0.368387] vdso: 2 pages (1 code @ ffff0000088f6000, 1 data @ ffff000008d64000)
> [ 0.375906] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
> [ 0.383492] DMA: preallocated 256 KiB pool for atomic allocations
> [ 0.389926] Serial: AMBA PL011 UART driver
> [ 0.396607] 7ff80000.uart: ttyAMA0 at MMIO 0x7ff80000 (irq = 24, base_baud = 0) is a PL011 rev3
> [ 0.405455] console [ttyAMA0] enabled
> [ 0.405455] console [ttyAMA0] enabled
> [ 0.412747] bootconsole [pl11] disabled
> [ 0.412747] bootconsole [pl11] disabled
> [ 0.448879] HugeTLB registered 2 MB page size, pre-allocated 0 pages
> [ 0.456038] ACPI: Interpreter disabled.
> [ 0.460736] vgaarb: loaded
> [ 0.463676] SCSI subsystem initialized
> [ 0.467861] usbcore: registered new interface driver usbfs
> [ 0.473364] usbcore: registered new interface driver hub
> [ 0.478725] usbcore: registered new device driver usb
> [ 0.484678] pps_core: LinuxPPS API ver. 1 registered
> [ 0.489606] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@...ux.it>
> [ 0.498694] PTP clock support registered
> [ 0.502752] dmi: Firmware registration failed.
> [ 0.507965] Advanced Linux Sound Architecture Driver Initialized.
> [ 0.514808] clocksource: Switched to clocksource arch_sys_counter
> [ 0.520983] VFS: Disk quotas dquot_6.6.0
> [ 0.524930] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
> [ 0.531982] pnp: PnP ACPI: disabled
> [ 0.543951] NET: Registered protocol family 2
> [ 0.548779] TCP established hash table entries: 65536 (order: 7, 524288 bytes)
> [ 0.556814] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
> [ 0.565070] TCP: Hash tables configured (established 65536 bind 65536)
> [ 0.571619] UDP hash table entries: 4096 (order: 5, 131072 bytes)
> [ 0.577902] UDP-Lite hash table entries: 4096 (order: 5, 131072 bytes)
> [ 0.584771] NET: Registered protocol family 1
> [ 0.589467] RPC: Registered named UNIX socket transport module.
> [ 0.595355] RPC: Registered udp transport module.
> [ 0.600021] RPC: Registered tcp transport module.
> [ 0.604685] RPC: Registered tcp NFSv4.1 backchannel transport module.
> [ 0.611740] hw perfevents: enabled with armv8_cortex_a57 PMU driver, 7 counters available
> [ 0.619970] hw perfevents: enabled with armv8_cortex_a53 PMU driver, 7 counters available
> [ 0.628262] kvm [1]: IDMAP page: 808d8000
> [ 0.632250] kvm [1]: HYP VA range: 800000000000:ffffffffffff
> [ 0.638698] kvm [1]: 8-bit VMID
> [ 0.641816] kvm [1]: Hyp mode initialized successfully
> [ 0.646947] kvm [1]: vgic-v2@...4f000
> [ 0.650721] kvm [1]: vgic interrupt IRQ1
> [ 0.654720] kvm [1]: virtual timer IRQ4
> [ 0.661194] futex hash table entries: 2048 (order: 6, 262144 bytes)
> [ 0.667506] audit: initializing netlink subsys (disabled)
> [ 0.672915] audit: type=2000 audit(0.536:1): initialized
> [ 0.678965] workingset: timestamp_bits=46 max_order=21 bucket_order=0
> [ 0.696868] squashfs: version 4.0 (2009/01/31) Phillip Lougher
> [ 0.703578] NFS: Registering the id_resolver key type
> [ 0.708612] Key type id_resolver registered
> [ 0.712766] Key type id_legacy registered
> [ 0.716752] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
> [ 0.723546] SGI XFS with security attributes, no debug enabled
> [ 0.730934] 9p: Installing v9fs 9p2000 file system support
> [ 0.738565] io scheduler noop registered
> [ 0.742480] io scheduler cfq registered (default)
> [ 0.747923] libphy: mdio_driver_register: phy-bcm-ns2-pci
> [ 0.754326] pl061_gpio 1c1d0000.gpio: PL061 GPIO chip @0x000000001c1d0000 registered
> [ 0.763984] dma-pl330 7ff00000.dma: Loaded driver for PL330 DMAC-341330
> [ 0.770560] dma-pl330 7ff00000.dma: DBUFF-1024x16bytes Num_Chans-8 Num_Peri-8 Num_Events-8
> [ 0.779809] xenfs: not registering filesystem on non-xen platform
> [ 0.788999] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [ 0.796505] SuperH (H)SCI(F) driver initialized
> [ 0.801247] msm_serial: driver initialized
> [ 0.811254] loop: module loaded
> [ 0.815840] libphy: Fixed MDIO Bus: probed
> [ 0.820328] tun: Universal TUN/TAP device driver, 1.6
> [ 0.825338] tun: (C) 1999-2004 Max Krasnyansky <maxk@...lcomm.com>
> [ 0.831905] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
> [ 0.837692] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
> [ 0.843605] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.3.0-k
> [ 0.850507] igb: Copyright (c) 2007-2014 Intel Corporation.
> [ 0.856072] igbvf: Intel(R) Gigabit Virtual Function Network Driver - version 2.0.2-k
> [ 0.863833] igbvf: Copyright (c) 2009 - 2012 Intel Corporation.
> [ 0.869799] sky2: driver version 1.30
> [ 0.895685] libphy: smsc911x-mdio: probed
> [ 0.970934] Generic PHY 18000000.etherne:01: attached PHY driver [Generic PHY] (mii_bus:phy_addr=18000000.etherne:01, irq=-1)
> [ 0.982316] smsc911x 18000000.ethernet eth0: MAC Address: 00:02:f7:00:58:bb
> [ 0.989404] VFIO - User Level meta-driver version: 0.3
> [ 0.995517] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [ 1.001993] ehci-pci: EHCI PCI platform driver
> [ 1.006432] ehci-platform: EHCI generic platform driver
> [ 1.011718] ehci-platform 7ffc0000.ehci: EHCI Host Controller
> [ 1.017428] ehci-platform 7ffc0000.ehci: new USB bus registered, assigned bus number 1
> [ 1.025419] ehci-platform 7ffc0000.ehci: irq 27, io mem 0x7ffc0000
> [ 1.046826] ehci-platform 7ffc0000.ehci: USB 2.0 started, EHCI 1.00
> [ 1.053541] hub 1-0:1.0: USB hub found
> [ 1.057279] hub 1-0:1.0: 1 port detected
> [ 1.061448] ehci-exynos: EHCI EXYNOS driver
> [ 1.065666] ehci-msm: Qualcomm On-Chip EHCI Host Controller
> [ 1.071254] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
> [ 1.077401] ohci-pci: OHCI PCI platform driver
> [ 1.081845] ohci-platform: OHCI generic platform driver
> [ 1.087113] ohci-platform 7ffb0000.ohci: Generic Platform OHCI controller
> [ 1.093855] ohci-platform 7ffb0000.ohci: new USB bus registered, assigned bus number 2
> [ 1.101791] ohci-platform 7ffb0000.ohci: irq 26, io mem 0x7ffb0000
> [ 1.187263] hub 2-0:1.0: USB hub found
> [ 1.191003] hub 2-0:1.0: 1 port detected
> [ 1.195133] ohci-exynos: OHCI EXYNOS driver
> [ 1.199619] usbcore: registered new interface driver usb-storage
> [ 1.206575] mousedev: PS/2 mouse device common for all mice
> [ 1.212778] rtc-efi rtc-efi: rtc core: registered rtc-efi as rtc0
> [ 1.219087] rtc-pl031 1c170000.rtc: rtc core: registered pl031 as rtc1
> [ 1.225912] i2c /dev entries driver
> [ 1.231598] mmci-pl18x 1c050000.mmci: mmc0: PL180 manf 41 rev0 at 0x1c050000 irq 32,0 (pio)
> [ 1.239880] mmci-pl18x 1c050000.mmci: DMA channels RX none, TX none
> [ 1.283106] sdhci: Secure Digital Host Controller Interface driver
> [ 1.289269] sdhci: Copyright(c) Pierre Ossman
> [ 1.293646] Synopsys Designware Multimedia Card Interface Driver
> [ 1.300985] sdhci-pltfm: SDHCI platform and OF driver helper
> [ 1.309245] leds-syscon 1c010000.apbregs:led@...0: registered LED vexpress:0
> [ 1.316358] leds-syscon 1c010000.apbregs:led@...1: registered LED vexpress:1
> [ 1.323550] leds-syscon 1c010000.apbregs:led@...2: registered LED vexpress:2
> [ 1.330953] leds-syscon 1c010000.apbregs:led@...3: registered LED vexpress:3
> [ 1.338043] leds-syscon 1c010000.apbregs:led@...4: registered LED vexpress:4
> [ 1.345139] leds-syscon 1c010000.apbregs:led@...5: registered LED vexpress:5
> [ 1.352224] leds-syscon 1c010000.apbregs:led@...6: registered LED vexpress:6
> [ 1.359553] leds-syscon 1c010000.apbregs:led@...7: registered LED vexpress:7
> [ 1.368522] ledtrig-cpu: registered to indicate activity on CPUs
> [ 1.375694] usbcore: registered new interface driver usbhid
> [ 1.381223] usbhid: USB HID core driver
> [ 1.385921] mhu 2b1f0000.mhu: ARM MHU Mailbox registered
> [ 1.392777] NET: Registered protocol family 17
> [ 1.394826] usb 1-1: new high-speed USB device number 2 using ehci-platform
> [ 1.404224] 9pnet: Installing 9P2000 support
> [ 1.408545] Key type dns_resolver registered
> [ 1.413706] registered taskstats version 1
> [ 1.455390] scpi_protocol scpi: incorrect or no SCP firmware found
> [ 1.461595] scpi_protocol: probe of scpi failed with error -110
> [ 1.468487] input: smb:motherboard:gpio_keys as /devices/platform/smb/smb:motherboard/smb:motherboard:gpio_keys/input/input1
> [ 1.480518] Unable to handle kernel paging request at virtual address 240ab2f8
> [ 1.487693] pgd = ffff000008e70000
> [ 1.491084] [240ab2f8] *pgd=00000009fff6d003, *pud=00000009fff6c003, *pmd=0000000000000000
> [ 1.499336] Internal error: Oops: 86000004 [#1] PREEMPT SMP
> [ 1.504849] Modules linked in:
> [ 1.507877] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc4-00007-g07a1ca6cb00d #1
> [ 1.515711] Hardware name: ARM Juno development board (r0) (DT)
> [ 1.521569] task: ffff8009768a8000 task.stack: ffff8009768b0000
> [ 1.527427] PC is at 0x240ab2f8
> [ 1.530531] LR is at 0x240aaac0
> [ 1.533637] pc : [<00000000240ab2f8>] lr : [<00000000240aaac0>] pstate: 60400145
> [ 1.540954] sp : ffff8009768b3c50
> [ 1.544230] x29: ffff8009768b3ca0 x28: 0000000000000000
> [ 1.549492] x27: ffff000008d279c0 x26: ffff000008c70470
> [ 1.554754] x25: ffff000008cbf230 x24: ffff000008c5fd70
> [ 1.560016] x23: ffff000008e2c000 x22: ffff8009768b3cf0
> [ 1.565278] x21: ffff8009768b3cf0 x20: ffff8009768b3d00
> [ 1.570540] x19: 8000000000000003 x18: ffffffffffffffff
> [ 1.575801] x17: 0000000000000000 x16: 0000000000000000
> [ 1.581063] x15: ffff80097612f16b x14: 0000000000000000
> [ 1.586323] x13: 0000000000000000 x12: 0000000000000038
> [ 1.591584] x11: 0000000000000020 x10: 0101010101010101
> [ 1.596846] x9 : 0000000000000000 x8 : ffffff7f7f7f7f7f
> [ 1.602107] x7 : fefe7eff2f627371 x6 : 000000008080ffff
> [ 1.607368] x5 : ffff8009768b3c98 x4 : 0000000000010001
> [ 1.612629] x3 : 00000000ff000001 x2 : 00000000240aa3e4
> [ 1.617890] x1 : ffff8009768b3c98 x0 : 0000000057d752e6
> [ 1.623150]
> [ 1.624622] Process swapper/0 (pid: 1, stack limit = 0xffff8009768b0028)
> [ 1.631253] Stack: (0xffff8009768b3c50 to 0xffff8009768b4000)
> [ 1.636941] 3c40: ffff000008e5dcd8 ffff8009768b3d00
> [ 1.644694] 3c60: 0000000000000140 ffff8009768b3cf0 ffff000008e2c000 ffff000008c5fd70
> [ 1.652447] 3c80: ffff00000876236c ffff8009768b3d00 ffff8009768b3da8 ffff00000855d1b4
> [ 1.660201] 3ca0: ffff8009768b3cd0 ffff000008703de8 ffff8009768b3da8 ffff000008dd9ff0
> [ 1.667954] 3cc0: ffff8009768b3da8 0000000000000007 ffff8009768b3d10 ffff000008700964
> [ 1.675707] 3ce0: ffff8009768b3da8 ffff800976a752e8 ffff8009768b3d40 ffff0000087006a8
> [ 1.683461] 3d00: ffff000008bbe958 ffff000008ca081c ffff8009768b3d30 ffff0000087009c8
> [ 1.691214] 3d20: ffff800976a75000 ffff0000087006b8 ffff8009768b3d70 ffff000008ca0878
> [ 1.698974] 3d40: ffff000008bbe958 ffff800976a75000 0000000000000000 0000000000000000
> [ 1.706727] 3d60: ffff000008dd94b0 ffff0000083f4820 ffff8009768b3dd0 ffff000008083b40
> [ 1.714480] 3d80: ffff8009768b0000 ffff000008ca081c ffff8009768b3db0 0000000000000000
> [ 1.722232] 3da0: 000000001dcd6500 0000000000000000 0000000000000000 0000000000000000
> [ 1.729984] 3dc0: 0000000000000000 ffff000000000000 ffff8009768b3e40 ffff000008c70d14
> [ 1.737737] 3de0: 0000000000000110 ffff000008e2c000 ffff000008cbf2c0 0000000000000007
> [ 1.745490] 3e00: ffff000008d27900 0000000000000000 ffff000008e2c000 ffff000008b48ac8
> [ 1.753242] 3e20: 0000000700000007 0000000000000000 0000000000000000 ffff000008c5fd70
> [ 1.760995] 3e40: ffff8009768b3ea0 ffff0000088d15d0 ffff0000088d15c0 0000000000000000
> [ 1.768747] 3e60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.776499] 3e80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.784252] 3ea0: 0000000000000000 ffff0000080830a0 ffff0000088d15c0 0000000000000000
> [ 1.792004] 3ec0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.799756] 3ee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.807508] 3f00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.815260] 3f20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.823023] 3f40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.830775] 3f60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.838527] 3f80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.846279] 3fa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [ 1.854031] 3fc0: 0000000000000000 0000000000000005 0000000000000000 0000000000000000
> [ 1.861783] 3fe0: 0000000000000000 0000000000000000 035b4d0700426040 000f000200440000
> [ 1.869531] Call trace:
> [ 1.871950] Exception stack(0xffff8009768b3a80 to 0xffff8009768b3bb0)
> [ 1.878327] 3a80: 8000000000000003 0001000000000000 0000000080e2b000 00000000240ab2f8
> [ 1.886080] 3aa0: ffff8009768b3b00 ffff00000818bb68 ffff800976015f80 00000000024000c0
> [ 1.893832] 3ac0: ffff00000818bbe4 000000000000001a ffff80097608dc10 ffff800976bd1218
> [ 1.901585] 3ae0: ffff8009768b3af0 ffff0000083f2670 ffff8009768b3b70 ffff0000083f2b40
> [ 1.909338] 3b00: 0000000000000000 ffff800976811b00 0000000000000000 ffff800976811a90
> [ 1.917091] 3b20: 0000000057d752e6 ffff8009768b3c98 00000000240aa3e4 00000000ff000001
> [ 1.924844] 3b40: 0000000000010001 ffff8009768b3c98 000000008080ffff fefe7eff2f627371
> [ 1.932596] 3b60: ffffff7f7f7f7f7f 0000000000000000 0101010101010101 0000000000000020
> [ 1.940349] 3b80: 0000000000000038 0000000000000000 0000000000000000 ffff80097612f16b
> [ 1.948098] 3ba0: 0000000000000000 0000000000000000
> [ 1.952925] [<00000000240ab2f8>] 0x240ab2f8
> [ 1.957069] [<ffff000008703de8>] efi_read_time+0x28/0x78
> [ 1.962329] [<ffff000008700964>] __rtc_read_time.isra.1+0x44/0x70
> [ 1.968360] [<ffff0000087009c8>] rtc_read_time+0x38/0x58
> [ 1.973620] [<ffff000008ca0878>] rtc_hctosys+0x5c/0xe4
> [ 1.978708] [<ffff000008083b40>] do_one_initcall+0x38/0x128
> [ 1.984227] [<ffff000008c70d14>] kernel_init_freeable+0x1ac/0x250
> [ 1.990261] [<ffff0000088d15d0>] kernel_init+0x10/0x100
> [ 1.995433] [<ffff0000080830a0>] ret_from_fork+0x10/0x30
> [ 2.000691] Code: bad PC value
>
> --
> Catalin
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