Re: [x86, kaslr] BUG: unable to handle kernel NULL pointer dereference at 00000008

From: Kees Cook
Date: Mon Jul 14 2014 - 17:54:01 EST

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Hi,

On Sat, Jul 5, 2014 at 7:23 PM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> Hi Kees,
>
> This bug is a bit old (and not very reproducible), however it's still
> showing up in the upstream and linux-next trees.

I'm still unable to reproduce this. It feels like it's something
specific to the qemu loader, maybe?

-Kees

>
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> commit 6145cfe394a7f138f6b64491c5663f97dba12450
> Author: Kees Cook <keescook@xxxxxxxxxxxx>
> AuthorDate: Thu Oct 10 17:18:18 2013 -0700
> Commit: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
> CommitDate: Sun Oct 13 03:13:13 2013 -0700
>
> x86, kaslr: Raise the maximum virtual address to -1 GiB on x86_64
>
> On 64-bit, this raises the maximum location to -1 GiB (from -1.5 GiB),
> the upper limit currently, since the kernel fixmap page mappings need
> to be moved to use the other 1 GiB (which would be the theoretical
> limit when building with -mcmodel=kernel).
>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Link: http://lkml.kernel.org/r/1381450698-28710-7-git-send-email-keescook@xxxxxxxxxxxx
> Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
>
> +-------------------------------------------------------------+------------+------------+---------------+
> | | f32360ef66 | 6145cfe394 | next-20140704 |
> +-------------------------------------------------------------+------------+------------+---------------+
> | boot_successes | 1000 | 885 | 1 |
> | boot_failures | 0 | 15 | 10 |
> | BUG:kernel_boot_crashed | 0 | 8 | |
> | BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 3 | 8 |
> | Oops | 0 | 3 | 7 |
> | EIP_is_at__lock_acquire | 0 | 3 | 1 |
> | BUG:scheduling_while_atomic | 0 | 3 | |
> | INFO:lockdep_is_turned_off | 0 | 3 | |
> | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 | 3 | |
> | backtrace:free_reserved_area | 0 | 3 | |
> | backtrace:free_init_pages | 0 | 3 | |
> | backtrace:populate_rootfs | 0 | 3 | |
> | backtrace:kernel_init_freeable | 0 | 3 | |
> | BUG:kernel_boot_hang | 0 | 1 | 1 |
> | BUG:Int_CR2(null) | 0 | 3 | |
> | backtrace:kvm_get_tsc_khz | 0 | 3 | |
> | backtrace:kvmclock_init | 0 | 3 | |
> | EIP_is_at_no_context | 0 | 0 | 5 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 0 | 5 |
> | backtrace:ring_buffer_consumer_thread | 0 | 0 | 1 |
> | WARNING:CPU:PID:at_lib/debugobjects.c:debug_print_object() | 0 | 0 | 4 |
> | BUG:spinlock_lockup_suspected_on_CPU | 0 | 0 | 1 |
> | EIP_is_at_default_send_IPI_mask_logical | 0 | 0 | 1 |
> | EIP_is_at_slob_free | 0 | 0 | 1 |
> | WARNING:CPU:PID:at_lib/debugobjects.c:__debug_object_init() | 0 | 0 | 2 |
> | backtrace:__debug_object_init | 0 | 0 | 2 |
> | backtrace:debug_object_init | 0 | 0 | 2 |
> | backtrace:init_timer_key | 0 | 0 | 2 |
> | backtrace:timer_fixup_assert_init | 0 | 0 | 2 |
> | backtrace:debug_object_assert_init | 0 | 0 | 2 |
> | backtrace:warn_slowpath_null | 0 | 0 | 1 |
> | backtrace:torture_stutter | 0 | 0 | 1 |
> | backtrace:debug_print_object | 0 | 0 | 1 |
> | backtrace:schedule_timeout | 0 | 0 | 1 |
> | INFO:trying_to_register_non-static_key | 0 | 0 | 1 |
> | backtrace:cryptomgr_test | 0 | 0 | 1 |
> +-------------------------------------------------------------+------------+------------+---------------+
>
> [ 0.910849] Unpacking initramfs...
> [ 0.914392] Initramfs unpacking failed: junk in compressed archive
> [ 0.914392] Initramfs unpacking failed: junk in compressed archive
> [ 0.931236] BUG: unable to handle kernel
> [ 0.931236] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 00000008
> at 00000008
> [ 0.933143] IP:
> [ 0.933143] IP: [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [ 0.934559] *pdpt = 0000000000000000
> [ 0.934559] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 *pde = f000ff53f000ff53
>
> [ 0.936088] Oops: 0000 [#1]
> [ 0.936088] Oops: 0000 [#1] SMP SMP
>
> [ 0.936976] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.936976] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.938910] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.938910] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.939584] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.939584] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.939584] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 0.939584] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 0.939584] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.939584] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.939584] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 0.939584] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 0.939584] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 0.939584] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 0.939584] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.939584] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.939584] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.939584] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.939584] Stack:
> [ 0.939584] Stack:
> [ 0.939584] c001dde4
> [ 0.939584] c001dde4 00000000 00000000 00000000 00000000 c008c440 c008c440 00000000 00000000 00000000 00000000 c008c440 c008c440 d1f1b2da d1f1b2da
>
> git bisect start v3.14 v3.13 --
> git bisect bad 494479038d97f1b9f76fc633a360a681acdf035c # 14:20 68- 5 Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
> git bisect bad 1b17366d695c8ab03f98d0155357e97a427e1dce # 14:27 98- 5 Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
> git bisect bad 60eaa0190f6b39dce18eb1975d9773ed8bc9a534 # 14:31 40- 3 Merge tag 'trace-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
> git bisect good 74e8ee8262c3f93bbc41804037b43f07b95897bb # 14:41 900+ 0 Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect bad 02d0a752460ea5dab34ce36c9ddc9c682e846a0d # 14:51 373- 6 Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
> git bisect bad 82b51734b4f228c76b6064b6e899d9d3d4c17c1a # 19:39 140- 2 Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
> git bisect bad f4bcd8ccddb02833340652e9f46f5127828eb79d # 19:59 312- 10 Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good fab5669d556200c4dd119af705bff14085845d1e # 20:23 900+ 0 Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good 7fe67a1180db49d41a3f764c379a08f8e31580ec # 20:44 900+ 0 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect bad 6145cfe394a7f138f6b64491c5663f97dba12450 # 20:58 481- 10 x86, kaslr: Raise the maximum virtual address to -1 GiB on x86_64
> git bisect good 8ab3820fd5b2896d66da7bb2a906bc382e63e7bc # 21:12 900+ 0 x86, kaslr: Return location from decompress_kernel
> git bisect good 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 # 21:34 900+ 0 x86, kaslr: Select random position from e820 maps
> git bisect good f32360ef6608434a032dc7ad262d45e9693c27f3 # 21:49 900+ 0 x86, kaslr: Report kernel offset on panic
> # first bad commit: [6145cfe394a7f138f6b64491c5663f97dba12450] x86, kaslr: Raise the maximum virtual address to -1 GiB on x86_64
> git bisect good f32360ef6608434a032dc7ad262d45e9693c27f3 # 21:52 1000+ 0 x86, kaslr: Report kernel offset on panic
> git bisect bad bb62c798798659624c53e3727bbc18cf47eb7ae8 # 21:53 0- 10 Add linux-next specific files for 20140704
> git bisect bad 77c4cf17ae867ba93233b3832bda3de7adaae326 # 21:56 24- 2 Merge tag 'md/3.16-fixes' of git://neil.brown.name/md
> git bisect bad bb62c798798659624c53e3727bbc18cf47eb7ae8 # 21:56 0- 10 Add linux-next specific files for 20140704
>
>
> This script may reproduce the error.
>
> -----------------------------------------------------------------------------
> #!/bin/bash
>
> kernel=$1
>
> kvm=(
> -kernel $kernel
> -smp 2
> -m 256M
> -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
> -net user,vlan=0
> -net nic,vlan=1,model=e1000
> -net user,vlan=1
> -boot order=nc
> -no-reboot
> -watchdog i6300esb
> -serial stdio
> -display none
> -monitor null
> )
>
> append=(
> debug
> sched_debug
> apic=debug
> ignore_loglevel
> sysrq_always_enabled
> panic=10
> prompt_ramdisk=0
> earlyprintk=ttyS0,115200
> console=ttyS0,115200
> console=tty0
> vga=normal
> root=/dev/ram0
> rw
> )
>
> "${kvm[@]}" --append "${append[*]}"
> -----------------------------------------------------------------------------
>
> All the dmesg oops lines are:
>
> dmesg-quantal-ivb42-23:20140705205649:i386-randconfig-ib0-07051041::
>
> [ 0.985813] Initramfs unpacking failed: junk in compressed archive
> [ 0.985813] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-ivb42-24:20140705205832:i386-randconfig-ib0-07051041::
>
> [ 1.020661] Unpacking initramfs...
> [ 1.023821] Initramfs unpacking failed: junk in compressed archive
> [ 1.023821] Initramfs unpacking failed: junk in compressed archive
> [ 1.040928] BUG: unable to handle kernel
> [ 1.040928] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 00000008
> at 00000008
> [ 1.042822] IP:
> [ 1.042822] IP: [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [ 1.044206] *pdpt = 0000000000000000
> [ 1.044206] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 *pde = f000ff53f000ff53
>
> [ 1.045723] Oops: 0000 [#1]
> [ 1.045723] Oops: 0000 [#1] SMP SMP
>
> [ 1.046603] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 1.046603] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 1.048483] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 1.048483] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 1.049412] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 1.049412] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 1.049412] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 1.049412] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 1.049412] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 1.049412] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 1.049412] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 1.049412] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 1.049412] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 1.049412] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 1.049412] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 1.049412] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 1.049412] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 1.049412] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 1.049412] Stack:
> [ 1.049412] Stack:
> [ 1.049412] c001dde4
> [ 1.049412] c001dde4 00000000 00000000 00000000 00000000 c008c440 c008c440 00000000 00000000 00000000 00000000 c008c440 c008c440 d1f1b2da d1f1b2da
>
>
> dmesg-quantal-ivb42-65:20140705205521:i386-randconfig-ib0-07051041::
>
> [ 1.042370] Initramfs unpacking failed: junk in compressed archive
> [ 1.042370] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-ivb42-73:20140705205642:i386-randconfig-ib0-07051041::
>
> [ 1.035555] Initramfs unpacking failed: junk in compressed archive
> [ 1.035555] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-ivb42-7:20140705205447:i386-randconfig-ib0-07051041::
>
> [ 1.004762] Initramfs unpacking failed: junk in compressed archive
> [ 1.004762] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-lkp-sbx04-103:20140705210037:i386-randconfig-ib0-07051041::
>
> [ 0.999757] Initramfs unpacking failed: junk in compressed archive
> [ 0.999757] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-lkp-sbx04-107:20140705205450:i386-randconfig-ib0-07051041::
>
> [ 0.488290] Initramfs unpacking failed: junk in compressed archive
> [ 0.488290] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-lkp-sbx04-11:20140705205553:i386-randconfig-ib0-07051041::
>
> [ 0.702863] Initramfs unpacking failed: junk in compressed archive
> [ 0.702863] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-quantal-lkp-sbx04-11:20140705205829:i386-randconfig-ib0-07051041::
>
> [ 0.872713] Unpacking initramfs...
> [ 0.875984] Initramfs unpacking failed: junk in compressed archive
> [ 0.875984] Initramfs unpacking failed: junk in compressed archive
> [ 0.879520] BUG: unable to handle kernel
> [ 0.879520] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 00000008
> at 00000008
> [ 0.881470] IP:
> [ 0.881470] IP: [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [ 0.881470] *pdpt = 0000000000000000
> [ 0.881470] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 *pde = f000ff53f000ff53
>
> [ 0.881470] Oops: 0000 [#1]
> [ 0.881470] Oops: 0000 [#1] SMP SMP
>
> [ 0.881470] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.881470] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.881470] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.881470] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.881470] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.881470] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.881470] EIP: 0060:[<d1eba850>] EFLAGS: 00010082 CPU: 0
> [ 0.881470] EIP: 0060:[<d1eba850>] EFLAGS: 00010082 CPU: 0
> [ 0.881470] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.881470] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.881470] EAX: 00000000 EBX: 0000000d ECX: 0000000d EDX: fffffffc
> [ 0.881470] EAX: 00000000 EBX: 0000000d ECX: 0000000d EDX: fffffffc
> [ 0.881470] ESI: d2829370 EDI: 00000000 EBP: c001ddac ESP: c001dd40
> [ 0.881470] ESI: d2829370 EDI: 00000000 EBP: c001ddac ESP: c001dd40
> [ 0.881470] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.881470] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.881470] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.881470] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.881470] Stack:
> [ 0.881470] Stack:
> [ 0.881470] c001de30
> [ 0.881470] c001de30 d1e4a25a d1e4a25a 00000000 00000000 00000001 00000001 d24c0000 d24c0000 80000000 80000000 000001e3 000001e3 d3c00000 d3c00000
>
>
> dmesg-quantal-lkp-sbx04-31:20140705210238:i386-randconfig-ib0-07051041::
>
> [ 0.910849] Unpacking initramfs...
> [ 0.914392] Initramfs unpacking failed: junk in compressed archive
> [ 0.914392] Initramfs unpacking failed: junk in compressed archive
> [ 0.931236] BUG: unable to handle kernel
> [ 0.931236] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 00000008
> at 00000008
> [ 0.933143] IP:
> [ 0.933143] IP: [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [<d1eba850>] __lock_acquire+0x5f0/0x1b90
> [ 0.934559] *pdpt = 0000000000000000
> [ 0.934559] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 *pde = f000ff53f000ff53
>
> [ 0.936088] Oops: 0000 [#1]
> [ 0.936088] Oops: 0000 [#1] SMP SMP
>
> [ 0.936976] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.936976] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.938910] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.938910] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.939584] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.939584] task: c008c440 ti: c001c000 task.ti: c001c000
> [ 0.939584] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 0.939584] EIP: 0060:[<d1eba850>] EFLAGS: 00010086 CPU: 0
> [ 0.939584] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.939584] EIP is at __lock_acquire+0x5f0/0x1b90
> [ 0.939584] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 0.939584] EAX: 00000000 EBX: 00000046 ECX: 00000046 EDX: fffffffc
> [ 0.939584] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 0.939584] ESI: d28307f0 EDI: 00000000 EBP: c001de18 ESP: c001ddac
> [ 0.939584] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.939584] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [ 0.939584] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.939584] CR0: 8005003b CR2: 00000008 CR3: 12601000 CR4: 000006b0
> [ 0.939584] Stack:
> [ 0.939584] Stack:
> [ 0.939584] c001dde4
> [ 0.939584] c001dde4 00000000 00000000 00000000 00000000 c008c440 c008c440 00000000 00000000 00000000 00000000 c008c440 c008c440 d1f1b2da d1f1b2da
>
>
> dmesg-quantal-lkp-sbx04-93:20140705205954:i386-randconfig-ib0-07051041::
>
> [ 0.736942] Initramfs unpacking failed: junk in compressed archive
> [ 0.736942] Initramfs unpacking failed: junk in compressed archive
>
> BUG: kernel boot crashed
>
> dmesg-yocto-ivb42-39:20140705210610:i386-randconfig-ib0-07051041::
>
> Decompressing Linux... Parsing ELF... Performing relocations... done.
> Booting the kernel.
>
> BUG: kernel boot hang
>
> dmesg-yocto-lkp-sbx04-13:20140705205527:i386-randconfig-ib0-07051041::
>
> [ 0.000000] low ram: 0 - 14012000
> [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
> [ 0.000000] kvm-clock: cpu 0, msr 0:14010001, boot clock
> [ 0.000000] BUG: Int 0: CR2 (null)
> [ 0.000000] EDI (null) ESI (null) EBP d36c1f10 EBX d4010000
> [ 0.000000] ESP d36c1f04 ES 0000007b DS 0000007b
> [ 0.000000] EDX (null) ECX (null) EAX 000f4240
> [ 0.000000] vec (null) err (null) EIP d304502e CS 00000060 flg 00210046
> [ 0.000000] Stack: 14010000 d36c1f40 d4011000 d36c1f18 d30441e2 d36c1f50 d37745b7 00001000
> [ 0.000000] (null) 4b564d00 0100007b (null) (null) (null) 564b4d56 0000004d
> [ 0.000000] d36c1fac d36c1fb4 (null) d36c1fc8 d3767a97 d36c1fac d36c1fb4 (null)
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.000000] 00000000 00000000 d36c1eb4 d346d181 d4010000 d36c1f10 d37601d1 d37d2b89
> [ 0.000000] 00000000 00000000 00000000 00000000 d36c1f10 d4010000 d36c1f04 0000007b
> [ 0.000000] 0000007b 00000000 00000000 000f4240 00000000 00000000 d304502e 00000060
> [ 0.000000] Call Trace:
> [ 0.000000] [<d346d181>] dump_stack+0x4b/0x66
> [ 0.000000] [<d37601d1>] early_idt_handler+0x65/0x65
> [ 0.000000] [<d304502e>] ? pvclock_tsc_khz+0x1e/0x60
> [ 0.000000] [<d30441e2>] kvm_get_tsc_khz+0x22/0x30
> [ 0.000000] [<d37745b7>] kvmclock_init+0x214/0x2a2
> [ 0.000000] [<d3767a97>] setup_arch+0xd45/0xe20
> [ 0.000000] [<d30a331c>] ? vprintk_emit+0x29c/0x5e0
> [ 0.000000] [<d3760793>] start_kernel+0x86/0x449
> [ 0.000000] [<d37603d1>] ? reserve_ebda_region+0x63/0x68
> [ 0.000000] [<d376036b>] i386_start_kernel+0x12e/0x131
>
>
> dmesg-yocto-lkp-sbx04-2:20140705205728:i386-randconfig-ib0-07051041::
>
> [ 0.000000] low ram: 0 - 14012000
> [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
> [ 0.000000] kvm-clock: cpu 0, msr 0:14010001, boot clock
> [ 0.000000] BUG: Int 0: CR2 (null)
> [ 0.000000] EDI (null) ESI (null) EBP d36c1f10 EBX d4010000
> [ 0.000000] ESP d36c1f04 ES 0000007b DS 0000007b
> [ 0.000000] EDX (null) ECX (null) EAX 000f4240
> [ 0.000000] vec (null) err (null) EIP d304502e CS 00000060 flg 00210046
> [ 0.000000] Stack: 14010000 d36c1f40 d4011000 d36c1f18 d30441e2 d36c1f50 d37745b7 00001000
> [ 0.000000] (null) 4b564d00 0100007b (null) (null) (null) 564b4d56 0000004d
> [ 0.000000] d36c1fac d36c1fb4 (null) d36c1fc8 d3767a97 d36c1fac d36c1fb4 (null)
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.000000] 00000000 00000000 d36c1eb4 d346d181 d4010000 d36c1f10 d37601d1 d37d2b89
> [ 0.000000] 00000000 00000000 00000000 00000000 d36c1f10 d4010000 d36c1f04 0000007b
> [ 0.000000] 0000007b 00000000 00000000 000f4240 00000000 00000000 d304502e 00000060
> [ 0.000000] Call Trace:
> [ 0.000000] [<d346d181>] dump_stack+0x4b/0x66
> [ 0.000000] [<d37601d1>] early_idt_handler+0x65/0x65
> [ 0.000000] [<d304502e>] ? pvclock_tsc_khz+0x1e/0x60
> [ 0.000000] [<d30441e2>] kvm_get_tsc_khz+0x22/0x30
> [ 0.000000] [<d37745b7>] kvmclock_init+0x214/0x2a2
> [ 0.000000] [<d3767a97>] setup_arch+0xd45/0xe20
> [ 0.000000] [<d30a331c>] ? vprintk_emit+0x29c/0x5e0
> [ 0.000000] [<d3760793>] start_kernel+0x86/0x449
> [ 0.000000] [<d37603d1>] ? reserve_ebda_region+0x63/0x68
> [ 0.000000] [<d376036b>] i386_start_kernel+0x12e/0x131
>
>
> dmesg-yocto-lkp-sbx04-69:20140705205858:i386-randconfig-ib0-07051041::
>
> [ 0.000000] low ram: 0 - 14012000
> [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
> [ 0.000000] kvm-clock: cpu 0, msr 0:14010001, boot clock
> [ 0.000000] BUG: Int 0: CR2 (null)
> [ 0.000000] EDI (null) ESI (null) EBP d36c1f10 EBX d4010000
> [ 0.000000] ESP d36c1f04 ES 0000007b DS 0000007b
> [ 0.000000] EDX (null) ECX (null) EAX 000f4240
> [ 0.000000] vec (null) err (null) EIP d304502e CS 00000060 flg 00210046
> [ 0.000000] Stack: 14010000 d36c1f40 d4011000 d36c1f18 d30441e2 d36c1f50 d37745b7 00001000
> [ 0.000000] (null) 4b564d00 0100007b (null) (null) (null) 564b4d56 0000004d
> [ 0.000000] d36c1fac d36c1fb4 (null) d36c1fc8 d3767a97 d36c1fac d36c1fb4 (null)
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc4-00007-g6145cfe #1
> [ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> [ 0.000000] 00000000 00000000 d36c1eb4 d346d181 d4010000 d36c1f10 d37601d1 d37d2b89
> [ 0.000000] 00000000 00000000 00000000 00000000 d36c1f10 d4010000 d36c1f04 0000007b
> [ 0.000000] 0000007b 00000000 00000000 000f4240 00000000 00000000 d304502e 00000060
> [ 0.000000] Call Trace:
> [ 0.000000] [<d346d181>] dump_stack+0x4b/0x66
> [ 0.000000] [<d37601d1>] early_idt_handler+0x65/0x65
> [ 0.000000] [<d304502e>] ? pvclock_tsc_khz+0x1e/0x60
> [ 0.000000] [<d30441e2>] kvm_get_tsc_khz+0x22/0x30
> [ 0.000000] [<d37745b7>] kvmclock_init+0x214/0x2a2
> [ 0.000000] [<d3767a97>] setup_arch+0xd45/0xe20
> [ 0.000000] [<d30a331c>] ? vprintk_emit+0x29c/0x5e0
> [ 0.000000] [<d3760793>] start_kernel+0x86/0x449
> [ 0.000000] [<d37603d1>] ? reserve_ebda_region+0x63/0x68
> [ 0.000000] [<d376036b>] i386_start_kernel+0x12e/0x131
>
> Thanks,
> Fengguang
>
> _______________________________________________
> LKP mailing list
> LKP@xxxxxxxxxxxxxxx
>

--
Kees Cook
Chrome OS Security
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