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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