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Date: Mon, 05 Oct 2009 12:15:12 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: catalin.marinas@....com
Cc: linux-kernel@...r.kernel.org
Subject: [2.6.32-rc3 kmemleak] WARNING: at kernel/lockdep.c:3161 check_flags+0xbe/0x180()
Hello.
I got this error.
[ 0.000000] Linux version 2.6.32-rc3 (root@...oyo) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Mon Oct 5 11:24:05 JST 2009
(...snipped...)
[ 0.000000] -------------------------------------------------------
[ 0.000000] Good, all 218 testcases passed! |
[ 0.000000] ---------------------------------
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at kernel/lockdep.c:3161 check_flags+0xbe/0x180()
[ 0.000000] Hardware name: VMware Virtual Platform
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.32-rc3 #1
[ 0.000000] Call Trace:
[ 0.000000] [<c104182d>] ? printk+0x1d/0x30
[ 0.000000] [<c107069e>] ? check_flags+0xbe/0x180
[ 0.000000] [<c1040de1>] warn_slowpath_common+0x81/0xa0
[ 0.000000] [<c107069e>] ? check_flags+0xbe/0x180
[ 0.000000] [<c1040e5a>] warn_slowpath_null+0x1a/0x30
[ 0.000000] [<c107069e>] check_flags+0xbe/0x180
[ 0.000000] [<c106e52e>] lockdep_trace_alloc+0x2e/0x60
[ 0.000000] [<c10cfedd>] kmem_cache_alloc+0x2d/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c106e22b>] ? trace_hardirqs_on+0xb/0x10
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cf9c4>] ? cache_alloc_refill+0x144/0x210
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cef9f>] alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10cf3de>] cache_grow+0xae/0x170
[ 0.000000] [<c10cf9fb>] cache_alloc_refill+0x17b/0x210
[ 0.000000] [<c10d005a>] kmem_cache_alloc+0x1aa/0x1d0
[ 0.000000] [<c10cd9b8>] ? obj_size+0x8/0x10
[ 0.000000] [<c10d3969>] ? create_object+0x29/0x220
[ 0.000000] [<c10d3969>] create_object+0x29/0x220
[ 0.000000] [<c10cd9a8>] ? obj_offset+0x8/0x10
[ 0.000000] [<c10ce07a>] ? poison_obj+0x2a/0x50
[ 0.000000] [<c1321693>] kmemleak_alloc+0x83/0xd0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] [<c10d0035>] kmem_cache_alloc+0x185/0x1d0
[ 0.000000] [<c106e1b7>] ? trace_hardirqs_on_caller+0xf7/0x160
[ 0.000000] [<c10cef9f>] ? alloc_slabmgmt+0x5f/0x80
[ 0.000000] <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ> <IRQ>(...snipped...)
Adding kmemleak=off to kernel command line solves this error.
Config is at http://I-love.SAKURA.ne.jp/tmp/config-2.6.32-rc3
By the way,
> static void early_alloc(struct early_log *log)
> {
> struct kmemleak_object *object;
> unsigned long flags;
> int i;
>
> if (!atomic_read(&kmemleak_enabled) || !log->ptr || IS_ERR(log->ptr))
> return;
>
> /*
> * RCU locking needed to ensure object is not freed via put_object().
> */
> rcu_read_lock();
> object = create_object((unsigned long)log->ptr, log->size,
> log->min_count, GFP_KERNEL);
I think we can't use GFP_KERNEL inside rcu_read_lock()...
> spin_lock_irqsave(&object->lock, flags);
> for (i = 0; i < log->trace_len; i++)
> object->trace[i] = log->trace[i];
> object->trace_len = log->trace_len;
> spin_unlock_irqrestore(&object->lock, flags);
> rcu_read_unlock();
> }
[PATCH 2.6.32-rc3] kmemleak: Use GFP_ATOMIC for early_alloc().
We can't use GFP_KERNEL inside rcu_read_lock().
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
mm/kmemleak.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-2.6.32-rc3.orig/mm/kmemleak.c
+++ linux-2.6.32-rc3/mm/kmemleak.c
@@ -833,7 +833,7 @@ static void early_alloc(struct early_log
*/
rcu_read_lock();
object = create_object((unsigned long)log->ptr, log->size,
- log->min_count, GFP_KERNEL);
+ log->min_count, GFP_ATOMIC);
spin_lock_irqsave(&object->lock, flags);
for (i = 0; i < log->trace_len; i++)
object->trace[i] = log->trace[i];
Regards.
--
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