linux-kernel - Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

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Date:	Mon, 21 May 2007 09:30:07 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Srihari Vijayaraghavan <sriharivijayaraghavan@...oo.com.au>
cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

On Sun, 20 May 2007, Srihari Vijayaraghavan wrote:

> With no CONFIG_SLUB_DEBUG, things have slightly improved. No more panic. Good.
> Serial console is working. Good. But there is another problem:

Well this indicates that something destroys the sysfs pointer structure 
that SLUB is using. Could you reenable CONFIG_SLUB_DEBUG and boot with the 
option "slub_debug" on the kernel command line?

Also enable the list debug options in kernel hacking.

This should show up on the console since the failure is in slub_sysfs_init 
which is long after the console has been enabled. I wonder why it did not 
show so far?

> Freeing unused kernel memory: 308k freed
> BUG: spinlock bad magic on CPU#1, init/1
>  lock: ffff81011ec0a100, .magic: ffff8101, .owner: <none>/-1, .owner_cpu: -1
> 
> Call Trace:
>  [<ffffffff802fc516>] _raw_spin_lock+0x22/0xf6
>  [<ffffffff8026f684>] vma_adjust+0x219/0x454
>  [<ffffffff8026f684>] vma_adjust+0x219/0x454
>  [<ffffffff8026fe0d>] vma_merge+0x147/0x1f4
>  [<ffffffff80270b55>] do_mmap_pgoff+0x414/0x7c7
>  [<ffffffff8040aa34>] _spin_unlock_irq+0x24/0x27
>  [<ffffffff8020f528>] sys_mmap+0xe5/0x110
>  [<ffffffff80209dde>] system_call+0x7e/0x83

Hmmmm..... We have seen this before

http://marc.info/?l=linux-kernel&m=117891943401284&w=2

I suspect this is due to an interaction with other debug flags you have 
set. What I see in your .config is

CONFIG_DEBUG_RT_MUTEXES=y

Try to switch this off if switching off the lockdep flags does not hel.

CONFIG_DEBUG_PI_LIST=y

Will go off with the above

# CONFIG_RT_MUTEX_TESTER is not set

Leave off

CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_MUTEXES=y

Try toggling if the disabling lockdep flags does not work.

CONFIG_DEBUG_LOCK_ALLOC=y
CONFIG_PROVE_LOCKING=y
CONFIG_LOCKDEP=y

I suspect the above are the main candidates for trouble. Could you
switch those off?

# CONFIG_DEBUG_LOCKDEP is not set
CONFIG_TRACE_IRQFLAGS=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
CONFIG_STACKTRACE=y

# CONFIG_DEBUG_KOBJECT is not set

Debug kobject may be helpful.

CONFIG_DEBUG_BUGVERBOSE=y

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