linux-kernel - kmemcheck: Caught 32-bit read from uninitialized memory, csum

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Date:	Thu, 26 Nov 2009 14:59:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>,
	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org
Subject: kmemcheck: Caught 32-bit read from uninitialized memory,
 csum_partial+0x107/0x120


FYI, -tip testing triggered this warning:

[20451.686644] cc1 used greatest stack depth: 4240 bytes left
[35034.306055] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (f281d45c)
[35034.315634] e9d80035001ffe326314010000010000000000000576656e757300001c000133
[35034.322141]  i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i u
[35034.326127]                                                          ^
[35034.336165] 
[35034.336165] Pid: 5135, comm: sendmail Tainted: G        W  (2.6.32-rc8-tip-02243-g64ef483-dirty #430) P4DC6
[35034.347344] EIP: 0060:[<c127eb4f>] EFLAGS: 00210283 CPU: 0
[35034.352803] EIP is at csum_partial+0x107/0x120
[35034.357221] EAX: dc1523cd EBX: 00ffffff ECX: ffffffe0 EDX: 0000003b
[35034.363461] ESI: f281d4dc EDI: 0000003b EBP: c40c59e8 ESP: c1df2f6c
[35034.369699]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[35034.375072] CR0: 8005003b CR2: f703e548 CR3: 0b198000 CR4: 000006d0
[35034.381311] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[35034.387551] DR6: ffff4ff0 DR7: 00000400
[35034.391551]  [<c16cd19b>] __skb_checksum_complete_head+0x1b/0x70
[35034.397343]  [<c16cd1fb>] __skb_checksum_complete+0xb/0x10
[35034.402802]  [<c1740992>] icmp_rcv+0x132/0x290
[35034.407221]  [<c17196cf>] ip_local_deliver_finish+0x11f/0x2d0
[35034.412940]  [<c17198eb>] ip_local_deliver+0x6b/0x80
[35034.414323]  [<c171902b>] ip_rcv_finish+0x15b/0x3f0
[35034.423265]  [<c17194f9>] ip_rcv+0x239/0x2f0
[35034.426977]  [<c16d63c6>] netif_receive_skb+0x336/0x400
[35034.432177]  [<c16d6526>] process_backlog+0x96/0xf0
[35034.437029]  [<c16d6d8c>] net_rx_action+0x17c/0x280
[35034.438412]  [<c1046fae>] __do_softirq+0x9e/0x160
[35034.447267]  [<c10470f5>] do_softirq+0x85/0xa0
[35034.450981]  [<c10476c9>] local_bh_enable+0xc9/0x110
[35034.455920]  [<c16d5d85>] dev_queue_xmit+0xf5/0x400
[35034.460774]  [<c16db2c3>] neigh_resolve_output+0xe3/0x1c0
[35034.466156]  [<c171e7ef>] ip_finish_output+0x1df/0x300
[35034.471257]  [<c171e9c8>] ip_output+0xb8/0xd0
[35034.475591]  [<c171dab8>] ip_local_out+0x18/0x20
[35034.480183]  [<c171dd17>] ip_push_pending_frames+0x257/0x3c0
[35034.485815]  [<c173ca99>] udp_push_pending_frames+0x159/0x340
[35034.491534]  [<c173cfc8>] udp_sendmsg+0x348/0x770
[35034.496213]  [<c17442a4>] inet_sendmsg+0x34/0x60
[35034.500806]  [<c16c36ff>] sock_sendmsg+0xff/0x120
[35034.502189]  [<c16c5045>] sys_sendto+0xa5/0xd0
[35034.506872]  [<c16c50a6>] sys_send+0x36/0x40
[35034.515291]  [<c16c5607>] sys_socketcall+0x1e7/0x2a0
[35034.519090]  [<c1003b3f>] sysenter_do_call+0x12/0x38
[35034.524029]  [<ffffffff>] 0xffffffff
[35035.362071] distcc used greatest stack depth: 4048 bytes left

config attached.

	Ingo

View attachment "config" of type "text/plain" (72165 bytes)