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Date: Tue, 20 Mar 2007 10:15:20 -0400
From: Chris Madden <chris@...lexsecurity.com>
To: hadi@...erus.ca
CC: netdev@...r.kernel.org
Subject: Re: Oops in filter add
jamal wrote:
> On Mon, 2007-19-03 at 19:22 -0700, David Miller wrote:
>> Can you just replace the above with dev->queue_lock and see if
>> that makes your problem go away? THanks.
>>
>
> It should;
> i will stare at the code later and see if i can send a better patch,
> maybe a read_lock(qdisc_tree_lock). Chris, if you can experiment by just
> locking against filters instead, that would be nicer for the reasons i
> described above.
>
>
Ok, I replaced ingress_lock with queue_lock in ing_filter and it died in
the same place. Trace below (looks to be substantively the same)...
If I am reading tc_ctl_tfilter correctly, we are adding our new
tcf_proto to the end of the list, and it is getting used before the
change function is getting executed on it. Locking the ingress_lock in
qdisc_lock_tree ( in addition to the extant queue_lock )seems to have
the same effect; I can get a traceback from that if its useful.
BUG: unable to handle kernel NULL pointer dereference at virtual address
0000004
printing
eip:
f8a5f093
*pde =
00000000
Oops: 0000
[#1]
SMP
Modules linked in: af_packet cls_basic sch_ingress button ac battery
ts_match bn
CPU:
0
EIP: 0060:[<f8a5f093>] Not tainted
VLI
EFLAGS: 00010246 (2.6.20.3-x86
#1)
EIP is at basic_classify+0xb/0x69
[cls_basic]
eax: f3d57080 ebx: f3dd6f00 ecx: c0329f1c edx:
f3dd6f00
esi: c0329f1c edi: 00000000 ebp: f3d57080 esp:
c0329ee4
ds: 007b es: 007b ss:
0068
Process python (pid: 2503, ti=c0329000 task=f431e570
task.ti=f42ac000)
Stack: f3dd6f00 f3d57080 f3dd6f00 00000008 c02206a1 00000286 f8aaad60
f3d57080
c0329f1c f3e606c0 f3d57080 00000000 df993000 f8a5c10b 00000080
c02108cd
df993000 f3d57080 c021454e df993000 00000040 f3db8780 00000008
00000000
Call Trace:
[<c02206a1>] tc_classify+0x34/0xbc
[<f8a5c10b>] ingress_enqueue+0x16/0x55 [sch_ingress]
[<c02108cd>] __alloc_skb+0x53/0xfd
[<c021454e>] netif_receive_skb+0x1cd/0x2a6
[<f88aa162>] e1000_clean_rx_irq+0x35b/0x42c [e1000]
[<f88a9e07>] e1000_clean_rx_irq+0x0/0x42c [e1000]
[<f88a9194>] e1000_clean+0x6e/0x23d [e1000]
[<c011007b>] handle_vm86_fault+0x16/0x6f7
[<c0215ef6>] net_rx_action+0xcc/0x1bc
[<c011cafc>] __do_softirq+0x5d/0xba
[<c0104c7f>] do_softirq+0x59/0xa9
[<c01341e3>] handle_fasteoi_irq+0x0/0xa0
[<c0104d70>] do_IRQ+0xa1/0xb9
[<c010367f>] common_interrupt+0x23/0x28
[<c014c39a>] kmem_cache_zalloc+0x33/0x5c
[<f8a5f4ac>] basic_change+0x17c/0x370 [cls_basic]
[<c02220ff>] tc_ctl_tfilter+0x3ec/0x469
[<c0221d13>] tc_ctl_tfilter+0x0/0x469
[<c021b270>] rtnetlink_rcv_msg+0x1b3/0x1d8
[<c0221398>] tc_dump_qdisc+0x0/0xfe
[<c02259ed>] netlink_run_queue+0x50/0xbe
[<c021b0bd>] rtnetlink_rcv_msg+0x0/0x1d8
[<c021b07c>] rtnetlink_rcv+0x25/0x3d
[<c0225e34>] netlink_data_ready+0x12/0x4c
[<c0224e2e>] netlink_sendskb+0x19/0x30
[<c0225e16>]
netlink_sendmsg+0x242/0x24e
[<c020ba5f>]
sock_sendmsg+0xbc/0xd4
[<c012832d>]
autoremove_wake_function+0x0/0x35
[<c012832d>]
autoremove_wake_function+0x0/0x35
[<c010367f>]
common_interrupt+0x23/0x28
[<c021184e>]
verify_iovec+0x3e/0x70
[<c020bc0b>]
sys_sendmsg+0x194/0x1f9
[<c0112bde>]
__wake_up+0x32/0x43
[<c022508a>]
netlink_insert+0x106/0x110
[<c022515b>]
netlink_autobind+0xc7/0xe3
[<c0226376>]
netlink_bind+0x8d/0x127
[<c013f623>]
do_wp_page+0x149/0x36c
[<c015d183>]
d_alloc+0x138/0x17a
[<c0140a2c>]
__handle_mm_fault+0x756/0x7a6
[<c020caa8>]
sys_socketcall+0x223/0x242
[<c0263dc3>]
do_page_fault+0x0/0x525
[<c0102ce4>]
syscall_call+0x7/0xb
=======================
Code: 1a ff 43 08 8b 76 18 83 ee 18 8b 46 18 0f 18 00 90 8d 56 18 8d 47
04 39 c
EIP: [<f8a5f093>] basic_classify+0xb/0x69 [cls_basic] SS:ESP
0068:c0329ee4
<0>Kernel panic - not syncing: Fatal exception in
interrupt
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