[Bug 27052] Module KVM : unable to handle kernel NULL pointer dereference at

bugzilla-daemon Sat, 12 Feb 2011 09:06:14 -0800

https://bugzilla.kernel.org/show_bug.cgi?id=27052






--- Comment #30 from prochazka <prochazka.nico...@gmail.com>  2011-02-12 
17:06:02 ---
hi marcelo, 
I enable CONFIG_SLUB_DEBUG=y and boot with slub_debug=FZPU, 
but now I cannot reproduce bug

I have a lot of : BUG kmalloc-1024: Object padding overwritten

example : 
Feb 12 16:26:49 bergson11630 
Feb 12 16:26:49 bergson11630
=============================================================================
Feb 12 16:26:49 bergson11630 BUG kmalloc-1024: Object padding overwritten
Feb 12 16:26:49 bergson11630
-----------------------------------------------------------------------------
Feb 12 16:26:49 bergson11630 
Feb 12 16:26:49 bergson11630 INFO: 0xffff8802f8588446-0xffff8802f8588447. First
byte 0x0 instead of 0x5a
Feb 12 16:26:49 bergson11630 INFO: Allocated in
sock_alloc_send_pskb+0x1d4/0x330 age=1 cpu=1 pid=20244
Feb 12 16:26:49 bergson11630 INFO: Freed in pskb_expand_head+0xcc/0x1f0 age=1
cpu=1 pid=20244
Feb 12 16:26:49 bergson11630 INFO: Slab 0xffffea000a6535c0 objects=29 used=16
fp=0xffff8802f8588000 flags=0x2000000000040c1
Feb 12 16:26:49 bergson11630 INFO: Object 0xffff8802f8588000 @offset=0
fp=0xffff8802f858a240
Feb 12 16:26:49 bergson11630 
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588000:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588010:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588020:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588030:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588040:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588050:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588060:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588070:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588080:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588090:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880a0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880b0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880c0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880d0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880e0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85880f0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588100:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588110:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588120:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588130:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588140:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588150:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588160:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588170:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588180:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588190:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881a0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881b0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881c0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881d0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881e0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85881f0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588200:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588210:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588220:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588230:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588240:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588250:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588260:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588270:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588280:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588290:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882a0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882b0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882c0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882d0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882e0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85882f0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588300:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588310:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588320:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588330:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588340:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588350:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588360:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588370:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588380:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f8588390:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883a0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883b0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883c0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883d0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883e0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Feb 12 16:26:49 bergson11630 Object 0xffff8802f85883f0:  6b 6b 6b 6b 6b 6b 6b
6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkkï¿½
Feb 12 16:26:49 bergson11630 Redzone 0xffff8802f8588400:  bb bb bb bb bb bb bb
bb                         ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½        
Feb 12 16:26:49 bergson11630 Padding 0xffff8802f8588440:  5a 5a 5a 5a 5a 5a 00
00                         ZZZZZZ..        
Feb 12 16:26:49 bergson11630 Pid: 20244, comm: qemu Not tainted 2.6.37 #4
Feb 12 16:26:49 bergson11630 Call Trace:
Feb 12 16:26:49 bergson11630 <IRQ>  [<ffffffff81113b13>]
print_trailer+0x103/0x160
Feb 12 16:26:49 bergson11630 [<ffffffff81114222>]
check_bytes_and_report+0x102/0x130
Feb 12 16:26:49 bergson11630 [<ffffffff811142fc>] check_object+0xac/0x260
Feb 12 16:26:49 bergson11630 [<ffffffff8183427e>] ? pskb_expand_head+0x5e/0x1f0
Feb 12 16:26:49 bergson11630 [<ffffffff81114d10>]
alloc_debug_processing+0x110/0x1a0
Feb 12 16:26:49 bergson11630 [<ffffffff8111632f>] __slab_alloc+0x36f/0x3f0
Feb 12 16:26:49 bergson11630 [<ffffffff8183427e>] ? pskb_expand_head+0x5e/0x1f0
Feb 12 16:26:49 bergson11630 [<ffffffff81116b77>] __kmalloc+0xe7/0x1b0
Feb 12 16:26:49 bergson11630 [<ffffffff8183427e>] pskb_expand_head+0x5e/0x1f0
Feb 12 16:26:49 bergson11630 [<ffffffff81936b08>]
nf_bridge_copy_header+0x78/0x180
Feb 12 16:26:49 bergson11630 [<ffffffff8192f220>]
br_dev_queue_push_xmit+0x80/0xa0
Feb 12 16:26:49 bergson11630 [<ffffffff8193505a>]
br_nf_dev_queue_xmit+0x2a/0xa0
Feb 12 16:26:49 bergson11630 [<ffffffff81935368>]
br_nf_post_routing+0x298/0x2f0
Feb 12 16:26:49 bergson11630 [<ffffffff8187ec8c>] nf_iterate+0x6c/0xb0
Feb 12 16:26:49 bergson11630 [<ffffffff8192f1a0>] ?
br_dev_queue_push_xmit+0x0/0xa0
Feb 12 16:26:49 bergson11630 [<ffffffff8187ed7e>] nf_hook_slow+0xae/0x110
Feb 12 16:26:49 bergson11630 [<ffffffff8192f1a0>] ?
br_dev_queue_push_xmit+0x0/0xa0
Feb 12 16:26:49 bergson11630 [<ffffffff8192f240>] ? br_forward_finish+0x0/0x60
Feb 12 16:26:49 bergson11630 [<ffffffff8192f283>] br_forward_finish+0x43/0x60
Feb 12 16:26:49 bergson11630 [<ffffffff81935528>]
br_nf_forward_finish+0x168/0x170
Feb 12 16:26:49 bergson11630 [<ffffffff81935a28>] br_nf_forward_ip+0x328/0x430
Feb 12 16:26:49 bergson11630 [<ffffffff8187ec8c>] nf_iterate+0x6c/0xb0
Feb 12 16:26:49 bergson11630 [<ffffffff8192f240>] ? br_forward_finish+0x0/0x60
Feb 12 16:26:49 bergson11630 [<ffffffff8187ed7e>] nf_hook_slow+0xae/0x110
Feb 12 16:26:49 bergson11630 [<ffffffff8192f240>] ? br_forward_finish+0x0/0x60
Feb 12 16:26:49 bergson11630 [<ffffffff8192f31e>] __br_forward+0x7e/0xd0
Feb 12 16:26:49 bergson11630 [<ffffffff8192f3d5>] br_forward+0x65/0x70
Feb 12 16:26:49 bergson11630 [<ffffffff81930128>]
br_handle_frame_finish+0x128/0x260
Feb 12 16:26:49 bergson11630 [<ffffffff81935d78>]
br_nf_pre_routing_finish_bridge+0x78/0xd0
Feb 12 16:26:49 bergson11630 [<ffffffff819360b0>]
br_nf_pre_routing_finish+0x2e0/0x370
Feb 12 16:26:49 bergson11630 [<ffffffff8187ed7e>] ? nf_hook_slow+0xae/0x110
Feb 12 16:26:49 bergson11630 [<ffffffff81935dd0>] ?
br_nf_pre_routing_finish+0x0/0x370
Feb 12 16:26:49 bergson11630 [<ffffffff81936848>] br_nf_pre_routing+0x708/0x8d0
Feb 12 16:26:49 bergson11630 [<ffffffff8187ec8c>] nf_iterate+0x6c/0xb0
Feb 12 16:26:49 bergson11630 [<ffffffff81930000>] ?
br_handle_frame_finish+0x0/0x260
Feb 12 16:26:49 bergson11630 [<ffffffff8187ed7e>] nf_hook_slow+0xae/0x110
Feb 12 16:26:49 bergson11630 [<ffffffff81930000>] ?
br_handle_frame_finish+0x0/0x260
Feb 12 16:26:49 bergson11630 [<ffffffff819303fd>] br_handle_frame+0x19d/0x240
Feb 12 16:26:49 bergson11630 [<ffffffff81930260>] ? br_handle_frame+0x0/0x240
Feb 12 16:26:49 bergson11630 [<ffffffff8183c287>]
__netif_receive_skb+0x167/0x5d0
Feb 12 16:26:49 bergson11630 [<ffffffff816a6a4f>] ? bnx2_poll+0xcf/0x230
Feb 12 16:26:49 bergson11630 [<ffffffff8183c7a2>] process_backlog+0xb2/0x1a0
Feb 12 16:26:49 bergson11630 [<ffffffff8183ddb5>] net_rx_action+0xb5/0x220
Feb 12 16:26:49 bergson11630 [<ffffffff8105b555>] __do_softirq+0xb5/0x230
Feb 12 16:26:49 bergson11630 [<ffffffff81003edc>] call_softirq+0x1c/0x30
Feb 12 16:26:49 bergson11630 <EOI>  [<ffffffff81005f95>] ? do_softirq+0x65/0xa0
Feb 12 16:26:49 bergson11630 [<ffffffff8183e168>] netif_rx_ni+0x28/0x30
Feb 12 16:26:49 bergson11630 [<ffffffff81720c38>] tun_chr_aio_write+0x358/0x4d0
Feb 12 16:26:49 bergson11630 [<ffffffff819b4e05>] ?
_raw_spin_lock_irq+0x15/0x20
Feb 12 16:26:49 bergson11630 [<ffffffff817208e0>] ? tun_chr_aio_write+0x0/0x4d0
Feb 12 16:26:49 bergson11630 [<ffffffff81124993>]
do_sync_readv_writev+0xd3/0x110
Feb 12 16:26:49 bergson11630 [<ffffffffa0063986>] ? vmx_vcpu_put+0x16/0x40
[kvm_intel]
Feb 12 16:26:49 bergson11630 [<ffffffffa0015f58>] ? kvm_arch_vcpu_put+0x28/0x40
[kvm]
Feb 12 16:26:49 bergson11630 [<ffffffff8112479a>] ?
rw_copy_check_uvector+0x7a/0x140
Feb 12 16:26:49 bergson11630 [<ffffffff811250a4>] do_readv_writev+0xd4/0x1f0
Feb 12 16:26:49 bergson11630 [<ffffffff81134a97>] ? do_vfs_ioctl+0xa7/0x560
Feb 12 16:26:49 bergson11630 [<ffffffff81125208>] vfs_writev+0x48/0x60
Feb 12 16:26:49 bergson11630 [<ffffffff81125331>] sys_writev+0x51/0xb0
Feb 12 16:26:49 bergson11630 [<ffffffff81003042>]
system_call_fastpath+0x16/0x1b
Feb 12 16:26:49 bergson11630 FIX kmalloc-1024: Restoring
0xffff8802f8588446-0xffff8802f8588447=0x5a
Feb 12 16:26:49 bergson11630 
Feb 12 16:26:50 bergson11630
=============================================================================
Feb 12 16:26:50 bergson11630 BUG kmalloc-512: Object padding overwritten
Feb 12 16:26:50 bergson11630
----------------------------------------------------------------------------- 




Pid: 0, comm: kworker/0:1 Tainted: G      D     2.6.37 #4
Call Trace:
 <IRQ>  [<ffffffff81113b13>] print_trailer+0x103/0x160
 [<ffffffff81114222>] check_bytes_and_report+0x102/0x130
 [<ffffffff81045e5a>] ? dequeue_task_fair+0x3a/0x90
 [<ffffffff811142fc>] check_object+0xac/0x260
 [<ffffffff81093ef5>] ? free_css_set_rcu+0x15/0x20
 [<ffffffff81114ed3>] free_debug_processing+0x133/0x260
 [<ffffffff81115154>] __slab_free+0x154/0x170
 [<ffffffff8111772e>] kfree+0xce/0x130
 [<ffffffff81093ef5>] free_css_set_rcu+0x15/0x20
 [<ffffffff810a313a>] __rcu_process_callbacks+0x11a/0x340
 [<ffffffff810a338d>] rcu_process_callbacks+0x2d/0xa0
 [<ffffffff8105b555>] __do_softirq+0xb5/0x230
 [<ffffffff81082f86>] ? tick_program_event+0x26/0x30
 [<ffffffff81003edc>] call_softirq+0x1c/0x30
 [<ffffffff81005f95>] do_softirq+0x65/0xa0
 [<ffffffff8105b415>] irq_exit+0x85/0x90
 [<ffffffff819b5930>] smp_apic_timer_interrupt+0x70/0x9b
 [<ffffffff81003993>] apic_timer_interrupt+0x13/0x20
 <EOI>  [<ffffffff813d4b56>] ? acpi_idle_enter_simple+0x13a/0x170
 [<ffffffff813d4b4f>] ? acpi_idle_enter_simple+0x133/0x170
 [<ffffffff813d4809>] acpi_idle_enter_bm+0xee/0x301
 [<ffffffff8180d591>] cpuidle_idle_call+0x91/0x140
 [<ffffffff810020d3>] cpu_idle+0x73/0x100
 [<ffffffff819ae5d8>] start_secondary+0x1b9/0x1be
FIX kmalloc-1024: Restoring 0xffff8807e7fff7de-0xffff8807e7fff7df=0x5a

=============================================================================
BUG kmalloc-2048: Object padding overwritten
-----------------------------------------------------------------------------

INFO: 0xffff8802f981b9f6-0xffff8802f981b9f7. First byte 0x0 instead of 0x5a
INFO: Allocated in sched_create_group+0x319/0x7c0 age=263926 cpu=2 pid=20454
INFO: Freed in skb_release_data+0xd0/0xe0 age=263927 cpu=0 pid=10313
INFO: Slab 0xffffea000a694540 objects=15 used=10 fp=0xffff8802f981eba8
flags=0x200000000004081
INFO: Object 0xffff8802f981b1b0 @offset=12720 fp=0x          (null)

Bytes b4 0xffff8802f981b1a0:  bf d1 04 00 01 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a
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  Object 0xffff8802f981b1b0:  00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00
................
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  Object 0xffff8802f981b1e0:  e0 b1 81 f9 02 88 ff ff e0 b1 81 f9 02 88 ff ff
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  Object 0xffff8802f981b1f0:  f0 b1 81 f9 02 88 ff ff f0 b1 81 f9 02 88 ff ff
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  Object 0xffff8802f981b2e0:  e0 b2 81 f9 02 88 ff ff e0 b2 81 f9 02 88 ff ff
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  Object 0xffff8802f981b2f0:  f0 b2 81 f9 02 88 ff ff f0 b2 81 f9 02 88 ff ff
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  Object 0xffff8802f981b4d0:  d0 b4 81 f9 02 88 ff ff d0 b4 81 f9 02 88 ff ff
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  Object 0xffff8802f981b4e0:  e0 b4 81 f9 02 88 ff ff e0 b4 81 f9 02 88 ff ff
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  Object 0xffff8802f981b5b0:  b0 b5 81 f9 02 88 ff ff b0 b5 81 f9 02 88 ff ff
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  Object 0xffff8802f981b5d0:  d0 b5 81 f9 02 88 ff ff d0 b5 81 f9 02 88 ff ff
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  Object 0xffff8802f981b5f0:  f0 b5 81 f9 02 88 ff ff f0 b5 81 f9 02 88 ff ff
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........d...d...
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................
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8ï¿½.ï¿½..ï¿½ï¿½........
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
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................
  Object 0xffff8802f981b9a0:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
 Redzone 0xffff8802f981b9b0:  cc cc cc cc cc cc cc cc                        
ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½        
 Padding 0xffff8802f981b9f0:  5a 5a 5a 5a 5a 5a 00 00                        
ZZZZZZ..        
Pid: 0, comm: swapper Tainted: G      D     2.6.37 #4
Call Trace:
 <IRQ>  [<ffffffff81113b13>] print_trailer+0x103/0x160
 [<ffffffff81114222>] check_bytes_and_report+0x102/0x130
 [<ffffffff811142fc>] check_object+0xac/0x260
 [<ffffffff8104aa43>] ? free_sched_group+0xd3/0x120
 [<ffffffff81114ed3>] free_debug_processing+0x133/0x260
 [<ffffffff81115154>] __slab_free+0x154/0x170
 [<ffffffff81078c4e>] ? hrtimer_try_to_cancel+0x7e/0xc0
 [<ffffffff8111772e>] kfree+0xce/0x130
 [<ffffffff8104aa43>] free_sched_group+0xd3/0x120
 [<ffffffff8104aaa5>] free_sched_group_rcu+0x15/0x20
 [<ffffffff810a313a>] __rcu_process_callbacks+0x11a/0x340
 [<ffffffff810a338d>] rcu_process_callbacks+0x2d/0xa0
 [<ffffffff8105b555>] __do_softirq+0xb5/0x230
 [<ffffffff81082f86>] ? tick_program_event+0x26/0x30
 [<ffffffff81003edc>] call_softirq+0x1c/0x30
 [<ffffffff81005f95>] do_softirq+0x65/0xa0
 [<ffffffff8105b415>] irq_exit+0x85/0x90
 [<ffffffff819b5930>] smp_apic_timer_interrupt+0x70/0x9b
 [<ffffffff81003993>] apic_timer_interrupt+0x13/0x20
 <EOI>  [<ffffffff813d49e4>] ? acpi_idle_enter_bm+0x2c9/0x301
 [<ffffffff813d49dd>] ? acpi_idle_enter_bm+0x2c2/0x301
 [<ffffffff8180d591>] cpuidle_idle_call+0x91/0x140
 [<ffffffff810020d3>] cpu_idle+0x73/0x100
 [<ffffffff8196a182>] rest_init+0x72/0x80
 [<ffffffff81f01dab>] start_kernel+0x397/0x3a2
 [<ffffffff81f0132a>] x86_64_start_reservations+0x131/0x135
 [<ffffffff81f01434>] x86_64_start_kernel+0x106/0x115
FIX kmalloc-2048: Restoring 0xffff8802f981b9f6-0xffff8802f981b9f7=0x5a

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[Bug 27052] Module KVM : unable to handle kernel NULL pointer dereference at

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