Re: EFI kdump without acpi_rsdp

[Dave Young]

On 07/31/2013 04:02 AM, Vivek Goyal wrote:
> On Tue, Jul 30, 2013 at 02:19:30PM +0800, Dave Young wrote:
> > Vivek
> >
> > I tried kdump without acpi_rsdp on your reserved machine. It can not
> > boot similar with the initial report here:
> > http://lists.infradead.org/pipermail/kexec/2010-March/003889.html
> >
> > Below is the detail kmsg, tried noacpi, noapic, nox2apic, they all does
> > not help on this problem.
>
> Hi Dave,
>
> Rich change the motherboard on this system. So looks like new motherboard
> does not work while old one worked. Strange.
>
> BTW, did you modify kexec-tools on this system to remove "noefi" and
> "acpi_rsdp=" parameters from command line. Or this kexec-tools is old.

I commented out the cmdline_add_efi function call in kexec-tools source
code, rebuilt it, put it /sbin/kexec.
> Thanks
> Vivek
> > [root@intel-canoepass-02 ~]# echo c >/proc/sysrq-trigger
> > [  288.091055] SysRq : Trigger a crash
> > [  288.094991] BUG: unable to handle kernel NULL pointer dereference at
> >           (null)
> > [  288.103755] IP: [<ffffffff813aee06>] sysrq_handle_crash+0x16/0x20
> > [  288.110574] PGD 41ed3a067 PUD 41ef11067 PMD 0
> > [  288.115573] Oops: 0002 [#1] SMP
> > [  288.119191] Modules linked in: nf_conntrack_netbios_ns
> > nf_conntrack_broadcast ipt_MASQUERADE ip6table_nat nf_nat_ipv6
> > ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat
> > nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4
> > xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter
> > ip6_tables vfat fat acpi_cpufreq mperf coretemp kvm_intel kvm
> > crc32_pclmul crc32c_intel ghash_clmulni_intel iTCO_wdt igb
> > iTCO_vendor_support ptp microcode lpc_ich pps_core mfd_core ioatdma
> > i2c_i801 dca mgag200 i2c_algo_bit drm_kms_helper ttm isci drm libsas
> > i2c_core scsi_transport_sas wmi
> > [  288.179797] CPU 3
> > [  288.181854] Pid: 1443, comm: bash Not tainted 3.9.8-300.fc19.x86_64
> > #1 Intel Corporation S2600CP/S2600CP
> > [  288.192633] RIP: 0010:[<ffffffff813aee06>]  [<ffffffff813aee06>]
> > sysrq_handle_crash+0x16/0x20
> > [  288.202158] RSP: 0018:ffff880420bd5e70  EFLAGS: 00010096
> > [  288.208083] RAX: 000000000000000f RBX: ffffffff81c9a100 RCX:
> > ffff88042f66fb90
> > [  288.216046] RDX: 0000000000000000 RSI: ffff88042f66df48 RDI:
> > 0000000000000063
> > [  288.224007] RBP: ffff880420bd5e70 R08: ffffffff81e97ddc R09:
> > 000000000000084e
> > [  288.231967] R10: 000000000000084d R11: 0000000000000003 R12:
> > 0000000000000063
> > [  288.239927] R13: 0000000000000246 R14: 0000000000000007 R15:
> > 0000000000000000
> > [  288.247888] FS:  00007f2458bb7740(0000) GS:ffff88042f660000(0000)
> > knlGS:0000000000000000
> > [  288.256917] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [  288.263329] CR2: 0000000000000000 CR3: 0000000425752000 CR4:
> > 00000000001407e0
> > [  288.271282] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > 0000000000000000
> > [  288.279244] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> > 0000000000000400
> > [  288.287205] Process bash (pid: 1443, threadinfo ffff880420bd4000,
> > task ffff880423811770)
> > [  288.296231] Stack:
> > [  288.298475]  ffff880420bd5ea8 ffffffff813af4c2 0000000000000002
> > ffff8804246dc900
> > [  288.306782]  00007f2458bbe000 0000000000000002 ffff880420bd5f50
> > ffff880420bd5ec8
> > [  288.315091]  ffffffff813af93a 00007f2458bbe000 ffff8804258ea600
> > ffff880420bd5f08
> > [  288.323398] Call Trace:
> > [  288.326135]  [<ffffffff813af4c2>] __handle_sysrq+0xa2/0x170
> > [  288.332357]  [<ffffffff813af93a>] write_sysrq_trigger+0x4a/0x50
> > [  288.338968]  [<ffffffff811fe809>] proc_reg_write+0x69/0xa0
> > [  288.345096]  [<ffffffff81199fcf>] vfs_write+0x9f/0x170
> > [  288.350831]  [<ffffffff8119a2c9>] sys_write+0x49/0xa0
> > [  288.356473]  [<ffffffff8164efd9>] system_call_fastpath+0x16/0x1b
> > [  288.363175] Code: e8 20 f8 ff ff eb c3 66 2e 0f 1f 84 00 00 00 00 00
> > 0f 1f 40 00 0f 1f 44 00 00 55 c7 05 04 7f ae 00 01 00 00 00 48 89 e5 0f
> > ae f8 <c6> 04 25 00 00 00 00 01 5d c3 0f 1f 44 00 00 55 31 c0 c7 05 6e
> > [  288.385035] RIP  [<ffffffff813aee06>] sysrq_handle_crash+0x16/0x20
> > [  288.391944]  RSP <ffff880420bd5e70>
> > [  288.395836] CR2: 0000000000000000
> > [    0.000000] Initializing cgroup subsys cpuset
> > [    0.000000] Initializing cgroup subsys cpu
> > [    0.000000] Linux version 3.9.8-300.fc19.x86_64 (mockbuild@bkernel02)
> > (gcc version 4.8.1 20130603 (Red Hat 4.8.1-1) (GCC) ) #1 SMP Thu Jun 27
> > 19:24:23 UTC 2013
> > [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.9.8-300.fc19.x86_64
> > root=/dev/mapper/fedora_intel--canoepass--02-root ro rd.md=0 rd.dm=0
> > rd.lvm.lv=fedora_intel-canoepass-02/root console=ttyS0,115200n81
> > vconsole.keymap=us rd.lvm.lv=fedora_intel-canoepass-02/swap rd.luks=0
> > vconsole.font=latarcyrheb-sun16  irqpoll nr_cpus=1 reset_devices
> > cgroup_disable=memory mce=off numa=off udev.children-max=2 rd.memdebug=1
> > rd.break=cmdline earlyprintk=ttyS0,115200n8 memmap=exactmap
> > memmap=636K@4K memmap=130412K@786432K elfcorehdr=916844K
> > memmap=3076K#3060380K memmap=2048K#3106140K memmap=280K#3110812K
> > memmap=848K#3111092K memmap=4K#3111940K memmap=120K#3111944K
> > memmap=564K#3112064K
> > [    0.000000] e820: BIOS-provided physical RAM map:
> > [    0.000000] BIOS-e820: [mem 0x0000000000000100-0x000000000009ffff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000b9f83fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000b9f84000-0x00000000b9f9efff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000b9f9f000-0x00000000ba556fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000ba557000-0x00000000ba558fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000ba559000-0x00000000ba8aefff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000ba8af000-0x00000000ba8d6fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000ba8d7000-0x00000000baa7ffff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000baa80000-0x00000000baa8ffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000baa90000-0x00000000baaa8fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000baaa9000-0x00000000baadffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000baae0000-0x00000000bab57fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bab58000-0x00000000bab5bfff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bab5c000-0x00000000bab67fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bab68000-0x00000000bab6bfff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bab6c000-0x00000000bab9bfff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bab9c000-0x00000000bababfff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000babac000-0x00000000babb1fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000babb2000-0x00000000babddfff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000babde000-0x00000000bac39fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bac3a000-0x00000000bac40fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bac41000-0x00000000baca6fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000baca7000-0x00000000bafa7fff]
> > ACPI NVS
> > [    0.000000] BIOS-e820: [mem 0x00000000bafa8000-0x00000000bb04afff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb04b000-0x00000000bb04efff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb04f000-0x00000000bb06cfff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb06d000-0x00000000bb070fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb071000-0x00000000bb085fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb086000-0x00000000bb089fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb08a000-0x00000000bb163fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb164000-0x00000000bb176fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb177000-0x00000000bb187fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb188000-0x00000000bb18bfff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb18c000-0x00000000bb1f6fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bb1f7000-0x00000000bb1fefff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bb1ff000-0x00000000bd8d5fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bd8d6000-0x00000000bd8d9fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bd8da000-0x00000000bd956fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bd957000-0x00000000bdb56fff]
> > ACPI NVS
> > [    0.000000] BIOS-e820: [mem 0x00000000bdb57000-0x00000000bdb5bfff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bdb5c000-0x00000000bdb5efff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bdb5f000-0x00000000bdcd5fff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000bdcd6000-0x00000000bdde6fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000bdde7000-0x00000000bde2cfff]
> > ACPI NVS
> > [    0.000000] BIOS-e820: [mem 0x00000000bde2d000-0x00000000bdf00fff]
> > ACPI data
> > [    0.000000] BIOS-e820: [mem 0x00000000bdf01000-0x00000000bdf01fff]
> > ACPI NVS
> > [    0.000000] BIOS-e820: [mem 0x00000000bdf02000-0x00000000bdf1ffff]
> > ACPI data
> > [    0.000000] BIOS-e820: [mem 0x00000000bdf20000-0x00000000bdfacfff]
> > ACPI NVS
> > [    0.000000] BIOS-e820: [mem 0x00000000bdfad000-0x00000000bdffffff] usable
> > [    0.000000] BIOS-e820: [mem 0x00000000be000000-0x00000000cfffffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000fed19000-0x00000000fed19fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x00000000ffc00000-0x00000000ffffffff]
> > reserved
> > [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000083fffffff] usable
> > [    0.000000] bootconsole [earlyser0] enabled
> > [    0.000000] e820: last_pfn = 0x840000 max_arch_pfn = 0x400000000
> > [    0.000000] NX (Execute Disable) protection: active
> > [    0.000000] e820: user-defined physical RAM map:
> > [    0.000000] user: [mem 0x0000000000001000-0x000000000009ffff] usable
> > [    0.000000] user: [mem 0x0000000030000000-0x0000000037f5afff] usable
> > [    0.000000] user: [mem 0x00000000baca7000-0x00000000bafa7fff] ACPI data
> > [    0.000000] user: [mem 0x00000000bd957000-0x00000000bdb56fff] ACPI data
> > [    0.000000] user: [mem 0x00000000bdde7000-0x00000000bdfacfff] ACPI data
> > [    0.000000] DMI not present or invalid.
> > [    0.000000] No AGP bridge found
> > [    0.000000] e820: last_pfn = 0x37f5b max_arch_pfn = 0x400000000
> > [    0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new
> > 0x7010600070106
> > [    0.000000] x2apic enabled by BIOS, switching to x2apic ops
> > [    0.000000] found SMP MP-table at [mem 0x000fcaf0-0x000fcaff] mapped
> > at [ffff8800000fcaf0]
> > [    0.000000] Using GB pages for direct mapping
> > [    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
> > [    0.000000] init_memory_mapping: [mem 0x37400000-0x375fffff]
> > [    0.000000] init_memory_mapping: [mem 0x34000000-0x373fffff]
> > [    0.000000] init_memory_mapping: [mem 0x30000000-0x33ffffff]
> > [    0.000000] init_memory_mapping: [mem 0x37600000-0x37f5afff]
> > [    0.000000] RAMDISK: [mem 0x377ac000-0x37f48fff]
> > [    0.000000] ACPI BIOS Bug: Error: A valid RSDP was not found
> > (20130117/tbxfroot-218)
> > [    0.000000] NUMA turned off
> > [    0.000000] Faking a node at [mem 0x0000000000000000-0x0000000037f5afff]
> > [    0.000000] Initmem setup node 0 [mem 0x00000000-0x37f5afff]
> > [    0.000000]   NODE_DATA [mem 0x37798000-0x377abfff]
> > [    0.000000] Zone ranges:
> > [    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
> > [    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
> > [    0.000000]   Normal   empty
> > [    0.000000] Movable zone start for each node
> > [    0.000000] Early memory node ranges
> > [    0.000000]   node   0: [mem 0x00001000-0x0009ffff]
> > [    0.000000]   node   0: [mem 0x30000000-0x37f5afff]
> > [    0.000000] SFI: Simple Firmware Interface v0.81
> > http://simplefirmware.org
> > [    0.000000] Intel MultiProcessor Specification v1.4
> > [    0.000000] MPTABLE: OEM ID: INTEL
> > [    0.000000] MPTABLE: Product ID: ROMLEY
> > [    0.000000] MPTABLE: APIC at: 0xFEE00000
> > [    0.000000] BUG: unable to handle kernel paging request at
> > ffffffffff5f8020
> > [    0.000000] IP: [<ffffffff8103c5a3>] native_apic_mem_read+0x3/0x10
> > [    0.000000] PGD 36c0f067 PUD 36c11067 PMD 36e4b067 PTE 0
> > [    0.000000] Oops: 0000 [#1] SMP
> > [    0.000000] Modules linked in:
> > [    0.000000] CPU 0
> > [    0.000000] Pid: 0, comm: swapper Not tainted 3.9.8-300.fc19.x86_64 #1
> > [    0.000000] RIP: 0010:[<ffffffff8103c5a3>]  [<ffffffff8103c5a3>]
> > native_apic_mem_read+0x3/0x10
> > [    0.000000] RSP: 0000:ffffffff81c01e38  EFLAGS: 00010046
> > [    0.000000] RAX: ffffffff81c20d40 RBX: ffff8800000fcaf0 RCX:
> > 0000000000000025
> > [    0.000000] RDX: 00000000000000ca RSI: 0000000000000046 RDI:
> > 0000000000000020
> > [    0.000000] RBP: ffffffff81c01e48 R08: 3a454c424154504d R09:
> > 000000000000008b
> > [    0.000000] R10: 7830203a74612043 R11: 3030303030454546 R12:
> > 0000000000000000
> > [    0.000000] R13: 000000000079c9ba R14: 00000000000004d4 R15:
> > ffffffffff475510
> > [    0.000000] FS:  0000000000000000(0000) GS:ffffffff81cef000(0000)
> > knlGS:0000000000000000
> > [    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.000000] CR2: ffffffffff5f8020 CR3: 0000000036c0c000 CR4:
> > 00000000000000b0
> > [    0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > 0000000000000000
> > [    0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> > 0000000000000400
> > [    0.000000] Process swapper (pid: 0, threadinfo ffffffff81c00000,
> > task ffffffff81c13440)
> > [    0.000000] Stack:
> > [    0.000000]  ffffffff81c01e48 ffffffff81037116 ffffffff81c01e60
> > ffffffff81d15bde
> > [    0.000000]  ffff8800000fcaf0 ffffffff81c01ed8 ffffffff81d14e9b
> > ffffffffff475000
> > [    0.000000]  ffffffff81c01e88 ffffffff8162ecf3 4e49ffff81c01ed8
> > ff000000004c4554
> > [    0.000000] Call Trace:
> > [    0.000000]  [<ffffffff81037116>] ? read_apic_id+0x16/0x30
> > [    0.000000]  [<ffffffff81d15bde>] register_lapic_address+0x60/0x89
> > [    0.000000]  [<ffffffff81d14e9b>] default_get_smp_config+0x24b/0x3e9
> > [    0.000000]  [<ffffffff8162ecf3>] ? sfi_unmap_memory+0x23/0x40
> > [    0.000000]  [<ffffffff81d0b001>] setup_arch+0xc51/0xd11
> > [    0.000000]  [<ffffffff8163c832>] ? printk+0x67/0x69
> > [    0.000000]  [<ffffffff81d04ba6>] start_kernel+0xd4/0x3fe
> > [    0.000000]  [<ffffffff81d04120>] ? early_idt_handlers+0x120/0x120
> > [    0.000000]  [<ffffffff81d045da>] x86_64_start_reservations+0x2a/0x2c
> > [    0.000000]  [<ffffffff81d046cf>] x86_64_start_kernel+0xf3/0x100
> > [    0.000000] Code: 81 f0 0f ab 01 eb 91 90 48 83 c4 10 5b 41 5c 41 5d
> > 41 5e 41 5f 5d c3 90 55 89 ff 48 89 e5 89 b7 00 80 5f ff 5d c3 66 90 55
> > 89 ff <8b> 87 00 80 5f ff 48 89 e5 5d c3 66 90 55 48 8b 05 d0 a6 7c 00
> > [    0.000000] RIP  [<ffffffff8103c5a3>] native_apic_mem_read+0x3/0x10
> > [    0.000000]  RSP <ffffffff81c01e38>
> > [    0.000000] CR2: ffffffffff5f8020
> > [    0.000000] ---[ end trace a7919e7f17c0a725 ]---
> > [    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
> > [    0.000000] BUG: unable to handle kernel paging request at
> > ffffffffff5f8030
> > [    0.000000] IP: [<ffffffff8103c5a3>] native_apic_mem_read+0x3/0x10
> > [    0.000000] PGD 36c0f067 PUD 36c11067 PMD 36e4b067 PTE 0
> > [    0.000000] Oops: 0000 [#2] SMP
> > [    0.000000] Modules linked in:
> > [    0.000000] CPU 0
> > [    0.000000] Pid: 0, comm: swapper Tainted: G      D
> > 3.9.8-300.fc19.x86_64 #1
> > [    0.000000] RIP: 0010:[<ffffffff8103c5a3>]  [<ffffffff8103c5a3>]
> > native_apic_mem_read+0x3/0x10
> > [    0.000000] RSP: 0000:ffffffff81c01a58  EFLAGS: 00010002
> > [    0.000000] RAX: ffffffff81c20d40 RBX: 0000000000000046 RCX:
> > 0000000000000002
> > [    0.000000] RDX: 0000000000000002 RSI: 0000000000000001 RDI:
> > 0000000000000030
> > [    0.000000] RBP: ffffffff81c01a70 R08: 0000000000000001 R09:
> > 0000000000000002
> > [    0.000000] R10: ffffffff81ce2b70 R11: 216b73617420656c R12:
> > 0000000000000000
> > [    0.000000] R13: ffffffff81ce2b70 R14: 0000000000000000 R15:
> > ffffffff81c13440
> > [    0.000000] FS:  0000000000000000(0000) GS:ffffffff81cef000(0000)
> > knlGS:0000000000000000
> > [    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.000000] CR2: ffffffffff5f8030 CR3: 0000000036c0c000 CR4:
> > 00000000000000b0
> > [    0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> > 0000000000000000
> > [    0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> > 0000000000000400
> > [    0.000000] Process swapper (pid: 0, threadinfo ffffffff81c00000,
> > task ffffffff81c13440)
> > [    0.000000] Stack:
> > [    0.000000]  ffffffff81c01a70 ffffffff81037664 0000000000000046
> > ffffffff81c01a80
> > [    0.000000]  ffffffff810378f2 ffffffff81c01aa8 ffffffff8103692e
> > ffffffff819e7c78
> > [    0.000000]  0000000000000000 0000000000000046 ffffffff81c01b20
> > ffffffff8163c695
> > [    0.000000] Call Trace:
> > [    0.000000]  [<ffffffff81037664>] ? clear_local_APIC+0x34/0x2a0
> > [    0.000000]  [<ffffffff810378f2>] disable_local_APIC+0x22/0x50
> > [    0.000000]  [<ffffffff8103692e>] native_stop_other_cpus+0xde/0x160
> > [    0.000000]  [<ffffffff8163c695>] panic+0xd7/0x1d7
> > [    0.000000]  [<ffffffff81062c89>] do_exit+0x939/0xa20
> > [    0.000000]  [<ffffffff8163c832>] ? printk+0x67/0x69
> > [    0.000000]  [<ffffffff81647ce3>] oops_end+0xa3/0xe0
> > [    0.000000]  [<ffffffff8163c168>] no_context+0x263/0x270
> > [    0.000000]  [<ffffffff8163c1e8>] __bad_area_nosemaphore+0x73/0x1cc
> > [    0.000000]  [<ffffffff8163c354>] bad_area_nosemaphore+0x13/0x15
> > [    0.000000]  [<ffffffff8164a8ae>] __do_page_fault+0x31e/0x510
> > [    0.000000]  [<ffffffff8105d73c>] ? print_time.part.4+0x6c/0x90
> > [    0.000000]  [<ffffffff8105d7cf>] ? print_prefix+0x6f/0xb0
> > [    0.000000]  [<ffffffff8105d8fa>] ? msg_print_text+0xea/0x1d0
> > [    0.000000]  [<ffffffff8103fb7c>] ? early_serial_write+0x2c/0x60
> > [    0.000000]  [<ffffffff81646826>] ? _raw_spin_unlock_irqrestore+0x16/0x20
> > [    0.000000]  [<ffffffff81646826>] ? _raw_spin_unlock_irqrestore+0x16/0x20
> > [    0.000000]  [<ffffffff8105ea75>] ? wake_up_klogd+0x5/0x50
> > [    0.000000]  [<ffffffff8164aaae>] do_page_fault+0xe/0x10
> > [    0.000000]  [<ffffffff81647158>] page_fault+0x28/0x30
> > [    0.000000]  [<ffffffff8103c5a3>] ? native_apic_mem_read+0x3/0x10
> > [    0.000000]  [<ffffffff81037116>] ? read_apic_id+0x16/0x30
> > [    0.000000]  [<ffffffff81d15bde>] register_lapic_address+0x60/0x89
> > [    0.000000]  [<ffffffff81d14e9b>] default_get_smp_config+0x24b/0x3e9
> > [    0.000000]  [<ffffffff8162ecf3>] ? sfi_unmap_memory+0x23/0x40
> > [    0.000000]  [<ffffffff81d0b001>] setup_arch+0xc51/0xd11
> > [    0.000000]  [<ffffffff8163c832>] ? printk+0x67/0x69
> > [    0.000000]  [<ffffffff81d04ba6>] start_kernel+0xd4/0x3fe
> > [    0.000000]  [<ffffffff81d04120>] ? early_idt_handlers+0x120/0x120
> > [    0.000000]  [<ffffffff81d045da>] x86_64_start_reservations+0x2a/0x2c
> > [    0.000000]  [<ffffffff81d046cf>] x86_64_start_kernel+0xf3/0x100
> > [    0.000000] Code: 81 f0 0f ab 01 eb 91 90 48 83 c4 10 5b 41 5c 41 5d
> > 41 5e 41 5f 5d c3 90 55 89 ff 48 89 e5 89 b7 00 80 5f ff 5d c3 66 90 55
> > 89 ff <8b> 87 00 80 5f ff 48 89 e5 5d c3 66 90 55 48 8b 05 d0 a6 7c 00
> > [    0.000000] RIP  [<ffffffff8103c5a3>] native_apic_mem_read+0x3/0x10
> > [    0.000000]  RSP <ffffffff81c01a58>
> > [    0.000000] CR2: ffffffffff5f8030
> > [    0.000000] ---[ end trace a7919e7f17c0a726 ]---
> >
> > -- 
> > Thanks
> > Dave
> >
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