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SubjectRe: Crash of 3.12-rc2 BUG: unable to handle kernel NULL pointer dereference
[+cc Thomas, Russell]

On Fri, Sep 27, 2013 at 7:13 AM, Zdenek Kabelac <zkabelac@redhat.com> wrote:
> Dne 27.9.2013 13:57, Zdenek Kabelac napsal(a):
>
>> Hi
>>
>>
>> I'm trying to use -rc2 kernel however I'm getting quite often regular
>> kernel
>> panic:
>>
>> Here is a BUG trace from kvm running this kernel:
>> (I'm building kernel with some kernel debug checks)
>> (Kernel is used in 64bit qemu and running 32bit Debian environment)
>> linux-vanilla git: 4b97280675f45c1650ee4e388bd711ecbb18c4b4
>> (on top of that there are few minor unrelated patches)
>>
>>
>> [ 235.631952] loop: module loaded
>> [ 235.971853] bio: create slab <bio-1> at 1
>> [ 237.355014] bio: create slab <bio-2> at 2
>> [ 237.671371] BUG: unable to handle kernel NULL pointer dereference at
>> 0000000000000018
>> [ 237.674537] IP: [<ffffffff8105a008>]
>> get_next_timer_interrupt+0x168/0x250
>> [ 237.674537] PGD 16939067 PUD 14257067 PMD 0
>> [ 237.674537] Oops: 0000 [#1] PREEMPT SMP
>> [ 237.674537] Modules linked in: loop dm_thin_pool dm_persistent_data
>
>
>
> Here is the same trace from my native HW Lenovo T61:
>
> I'm suspecting new debug option:
> CONFIG_DEBUG_KOBJECT_RELEASE which I've recently enabled)
>
> I've also noticed there are much older reports for this problem:
> i.e. https://lkml.org/lkml/2013/3/9/3
>
> I can trigger this bug very easily (makes 3.12-rc2 unusable for my desktop)

Yep, I see this crash 100% of the time with v3.12-rc2 and
CONFIG_DEBUG_KOBJECT_RELEASE=y with this qemu invocation and attached
q35-chipset.cfg:

/usr/local/bin/qemu-system-x86_64 -M q35 -readconfig ./q35-chipset.cfg
-enable-kvm -m 512 -drive file=ubuntu.img,if=none,id=mydisk -device
ide-drive,drive=mydisk,bus=ide.0 -nographic -monitor
telnet:localhost:7001,server,nowait,nodelay -kernel
~/linux/arch/x86/boot/bzImage -append "console=ttyS0,115200n8
root=/dev/sda1 ignore_loglevel printk.time=n"
[unhandled content-type:application/octet-stream]
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