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"Validation count is zero before decrement" from acpi_tb_put_table()

DISCUSSION Paul E. McKenney 2 participants 3 messages Dec 31, 2016 – Jan 3, 2017 ACPI

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Paul E. McKenney

author
#0 lore raw

Hello!

After moving to 4.10-rc1, my tests are showing the following warning during very early boot, as in even before rcu_init() is invoked:

ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement

This warning appears to have been introduced by 174cc7187e6f0 ("ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel").

I am running on qemu version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.6). Here is my qemu invocation:

qemu-system-x86_64 -enable-kvm -nographic -smp 1 -serial file:/home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/console.log -m 512 -kernel /home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/bzImage -append "noapic selinux=0 initcall_debug debug console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1"

Do I need to give qemu some special arguments to run v4.10-rc1 without hitting this sort of warning?

Thanx, Paul

PS. Relevant lines of dmesg below. I get this warning on a wide range
of .config files, but let me know if you want that information.

------------------------------------------------------------------------

[    0.000000] Linux version 4.10.0-rc1+ ([email protected]) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #1 PREEMPT Wed Dec 28 17:28:37 PST 2016
[    0.000000] Command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] x86/fpu: Legacy x87 FPU detected.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001ffdffff] usable
[    0.000000] BIOS-e820: [mem 0x000000001ffe0000-0x000000001fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x1ffe0 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: write-back
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 0080000000 mask FF80000000 uncachable
[    0.000000]   1 disabled
[    0.000000]   2 disabled
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86/PAT: PAT not supported by CPU.
[    0.000000] x86/PAT: Configuration [0-7]: WB  WT  UC- UC  WB  WT  UC- UC  
[    0.000000] found SMP MP-table at [mem 0x000f6640-0x000f664f] mapped at [ffff8800000f6640]
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576
[    0.000000] BRK [0x031b0000, 0x031b0fff] PGTABLE
[    0.000000] BRK [0x031b1000, 0x031b1fff] PGTABLE
[    0.000000] BRK [0x031b2000, 0x031b2fff] PGTABLE
[    0.000000] BRK [0x031b3000, 0x031b3fff] PGTABLE
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6460 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000001FFE16EE 000034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000001FFE0C14 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000001FFE0040 000BD4 (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000001FFE0000 000040
[    0.000000] ACPI: SSDT 0x000000001FFE0C88 0009B6 (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: APIC 0x000000001FFE163E 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: HPET 0x000000001FFE16B6 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x000000001ffdffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000001ffdffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffdffff]
[    0.000000] On node 0 totalpages: 130942
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3998 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 1984 pages used for memmap
[    0.000000]   DMA32 zone: 126944 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] ACPI: Skipping IOAPIC probe due to 'noapic' option.
[    0.000000] Using ACPI for processor (LAPIC) configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] Intel MultiProcessor Specification v1.4
[    0.000000] MPTABLE: OEM ID: BOCHSCPU
[    0.000000] MPTABLE: Product ID: 0.1         
[    0.000000] MPTABLE: APIC at: 0xFEE00000
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] Processors: 1
[    0.000000] e820: [mem 0x20000000-0xfeffbfff] available for PCI devices
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 128873
[    0.000000] Kernel command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.000000] Calgary: detecting Calgary via BIOS EBDA area
[    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
[    0.000000] ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement
[    0.000000]  (20160930/tbutils-455)
[    0.000000] Memory: 480128K/523768K available (9143K kernel code, 1251K rwdata, 2788K rodata, 18204K init, 696K bss, 43640K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 64.
[    0.000000] NR_IRQS:4352 nr_irqs:256 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [ttyS0] enabled
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 1995.009 MHz processor
[    0.003015] Calibrating delay loop (skipped), value calculated using timer frequency.. 3990.01 BogoMIPS (lpj=1995009)
[    0.004005] pid_max: default: 32768 minimum: 301
#1 lore raw
Quoted 1 line · Paul E. McKenney

Hello!

Hi Paul,

Quoted 9 lines

After moving to 4.10-rc1, my tests are showing the following warning during very early boot, as in even before rcu_init() is invoked:

ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement

This warning appears to have been introduced by 174cc7187e6f0 ("ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel").

Quoted 7 lines

I am running on qemu version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.6). Here is my qemu invocation:

qemu-system-x86_64 -enable-kvm -nographic -smp 1 -serial file:/home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/console.log -m 512 -kernel /home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/bzImage -append "noapic selinux=0 initcall_debug debug console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1"

Do I need to give qemu some special arguments to run v4.10-rc1 without hitting this sort of warning?

Adding Lv who is the author of the commit in question.

Lv, can you help, please?

Thanks,
Rafael

Quoted 111 lines

PS. Relevant lines of dmesg below. I get this warning on a wide range
of .config files, but let me know if you want that information.

------------------------------------------------------------------------

[    0.000000] Linux version 4.10.0-rc1+ ([email protected]) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #1 PREEMPT Wed Dec 28 17:28:37 PST 2016
[    0.000000] Command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] x86/fpu: Legacy x87 FPU detected.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001ffdffff] usable
[    0.000000] BIOS-e820: [mem 0x000000001ffe0000-0x000000001fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x1ffe0 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: write-back
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 0080000000 mask FF80000000 uncachable
[    0.000000]   1 disabled
[    0.000000]   2 disabled
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86/PAT: PAT not supported by CPU.
[    0.000000] x86/PAT: Configuration [0-7]: WB  WT  UC- UC  WB  WT  UC- UC  
[    0.000000] found SMP MP-table at [mem 0x000f6640-0x000f664f] mapped at [ffff8800000f6640]
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576
[    0.000000] BRK [0x031b0000, 0x031b0fff] PGTABLE
[    0.000000] BRK [0x031b1000, 0x031b1fff] PGTABLE
[    0.000000] BRK [0x031b2000, 0x031b2fff] PGTABLE
[    0.000000] BRK [0x031b3000, 0x031b3fff] PGTABLE
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6460 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000001FFE16EE 000034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000001FFE0C14 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000001FFE0040 000BD4 (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000001FFE0000 000040
[    0.000000] ACPI: SSDT 0x000000001FFE0C88 0009B6 (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: APIC 0x000000001FFE163E 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: HPET 0x000000001FFE16B6 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x000000001ffdffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000001ffdffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffdffff]
[    0.000000] On node 0 totalpages: 130942
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3998 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 1984 pages used for memmap
[    0.000000]   DMA32 zone: 126944 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] ACPI: Skipping IOAPIC probe due to 'noapic' option.
[    0.000000] Using ACPI for processor (LAPIC) configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] Intel MultiProcessor Specification v1.4
[    0.000000] MPTABLE: OEM ID: BOCHSCPU
[    0.000000] MPTABLE: Product ID: 0.1         
[    0.000000] MPTABLE: APIC at: 0xFEE00000
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] Processors: 1
[    0.000000] e820: [mem 0x20000000-0xfeffbfff] available for PCI devices
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 128873
[    0.000000] Kernel command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.000000] Calgary: detecting Calgary via BIOS EBDA area
[    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
[    0.000000] ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement
[    0.000000]  (20160930/tbutils-455)
[    0.000000] Memory: 480128K/523768K available (9143K kernel code, 1251K rwdata, 2788K rodata, 18204K init, 696K bss, 43640K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 64.
[    0.000000] NR_IRQS:4352 nr_irqs:256 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [ttyS0] enabled
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 1995.009 MHz processor
[    0.003015] Calibrating delay loop (skipped), value calculated using timer frequency.. 3990.01 BogoMIPS (lpj=1995009)
[    0.004005] pid_max: default: 32768 minimum: 301
author
#2 lore raw
Quoted 17 lines · Rafael J. Wysocki
Quoted 1 line · Paul E. McKenney

Hello!

Hi Paul,

Quoted 12 lines

After moving to 4.10-rc1, my tests are showing the following warning during very early boot, as in even before rcu_init() is invoked:

ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement

This warning appears to have been introduced by 174cc7187e6f0 ("ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel").

I am running on qemu version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.6). Here is my qemu invocation:

Quoted 8 lines
Quoted 4 lines

qemu-system-x86_64 -enable-kvm -nographic -smp 1 -serial file:/home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/console.log -m 512 -kernel /home/paulmck/public_git/linux-rcu/tools/testing/selftests/rcutorture/res/2016.12.28-15:04:34/TREE09/bzImage -append "noapic selinux=0 initcall_debug debug console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1"

Do I need to give qemu some special arguments to run v4.10-rc1 without hitting this sort of warning?

Adding Lv who is the author of the commit in question.

Lv, can you help, please?

Thank you, Rafael!

Lv, what should I do about this warning? I could make my scripts ignore it, but I would really rather not -- too much chances of that getting me in trouble later on.

Thanx, Paul

Quoted 116 lines

Thanks,
Rafael

Quoted 111 lines

PS. Relevant lines of dmesg below. I get this warning on a wide range
of .config files, but let me know if you want that information.

------------------------------------------------------------------------

[    0.000000] Linux version 4.10.0-rc1+ ([email protected]) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #1 PREEMPT Wed Dec 28 17:28:37 PST 2016
[    0.000000] Command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] x86/fpu: Legacy x87 FPU detected.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001ffdffff] usable
[    0.000000] BIOS-e820: [mem 0x000000001ffe0000-0x000000001fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x1ffe0 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: write-back
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 0080000000 mask FF80000000 uncachable
[    0.000000]   1 disabled
[    0.000000]   2 disabled
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] x86/PAT: PAT not supported by CPU.
[    0.000000] x86/PAT: Configuration [0-7]: WB  WT  UC- UC  WB  WT  UC- UC  
[    0.000000] found SMP MP-table at [mem 0x000f6640-0x000f664f] mapped at [ffff8800000f6640]
[    0.000000] Scanning 1 areas for low memory corruption
[    0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576
[    0.000000] BRK [0x031b0000, 0x031b0fff] PGTABLE
[    0.000000] BRK [0x031b1000, 0x031b1fff] PGTABLE
[    0.000000] BRK [0x031b2000, 0x031b2fff] PGTABLE
[    0.000000] BRK [0x031b3000, 0x031b3fff] PGTABLE
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6460 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000001FFE16EE 000034 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000001FFE0C14 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000001FFE0040 000BD4 (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000001FFE0000 000040
[    0.000000] ACPI: SSDT 0x000000001FFE0C88 0009B6 (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: APIC 0x000000001FFE163E 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: HPET 0x000000001FFE16B6 000038 (v01 BOCHS  BXPCHPET 00000001 BXPC 00000001)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x000000001ffdffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000001ffdffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000001ffdffff]
[    0.000000] On node 0 totalpages: 130942
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3998 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 1984 pages used for memmap
[    0.000000]   DMA32 zone: 126944 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] ACPI: Skipping IOAPIC probe due to 'noapic' option.
[    0.000000] Using ACPI for processor (LAPIC) configuration information
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
[    0.000000] Intel MultiProcessor Specification v1.4
[    0.000000] MPTABLE: OEM ID: BOCHSCPU
[    0.000000] MPTABLE: Product ID: 0.1         
[    0.000000] MPTABLE: APIC at: 0xFEE00000
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] Processors: 1
[    0.000000] e820: [mem 0x20000000-0xfeffbfff] available for PCI devices
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 128873
[    0.000000] Kernel command line: noapic selinux=0 initcall_debug debug
[    0.000000] console=ttyS0 rcu_nocb_poll rcutorture.n_barrier_cbs=4 rcutorture.stat_interval=15 rcutorture.shutdown_secs=3600 rcutorture.torture_runnable=1 rcutorture.test_no_idle_hz=1 rcutorture.verbose=1
[    0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.000000] Calgary: detecting Calgary via BIOS EBDA area
[    0.000000] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
[    0.000000] ACPI Warning: Table ffffffff81ffcf20, Validation count is zero before decrement
[    0.000000]  (20160930/tbutils-455)
[    0.000000] Memory: 480128K/523768K available (9143K kernel code, 1251K rwdata, 2788K rodata, 18204K init, 696K bss, 43640K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 64.
[    0.000000] NR_IRQS:4352 nr_irqs:256 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [ttyS0] enabled
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 1995.009 MHz processor
[    0.003015] Calibrating delay loop (skipped), value calculated using timer frequency.. 3990.01 BogoMIPS (lpj=1995009)
[    0.004005] pid_max: default: 32768 minimum: 301