linux-kernel - kmemcheck: Caught 32-bit read from uninitialized memory (f6038ec0)

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Date:	Mon, 29 Sep 2008 13:57:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-kernel@...r.kernel.org
Subject: kmemcheck: Caught 32-bit read from uninitialized memory (f6038ec0)


got the report below - config attached. This is probably bitfield 
initialization related. tip-072062d5.

	Ingo

----------------->
kmemcheck: Caught 32-bit read from uninitialized memory (f6038ec0)
0000000000000000d0e86bc0d0fa6bc070446cc060fa6bc0205c71c0103772c0
 u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
 ^

Pid: 0, comm: swapper Tainted: G        W (2.6.27-rc7-tip-00980-g072062d-dirty #37099) System Product Name
EIP: 0060:[<c06beba6>] EFLAGS: 00010282 CPU: 0
EIP is at sk_clone+0x26/0x1d0
EAX: f6038d80 EBX: f6038d80 ECX: 00000020 EDX: c0ac19c0
ESI: f6038000 EDI: f6038d80 EBP: c0b67d54 ESP: c0b860e8
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
CR0: 8005003b CR2: f6015800 CR3: 36105000 CR4: 00000680
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff4ff0 DR7: 00000400
 [<c0704f7a>] inet_csk_clone+0x1a/0x90
 [<c07185aa>] tcp_create_openreq_child+0x1a/0x3a0
 [<c071637f>] tcp_v4_syn_recv_sock+0x3f/0x1c0
 [<c07183c3>] tcp_check_req+0x283/0x450
 [<c0715e81>] tcp_v4_do_rcv+0x261/0x360
 [<c0717fa4>] tcp_v4_rcv+0x5d4/0x6b0
 [<c06fc66c>] ip_local_deliver+0x6c/0x1a0
 [<c06fca85>] ip_rcv+0x2e5/0x5a0
 [<c06c7621>] netif_receive_skb+0x3f1/0x480
 [<c047030f>] nv_napi_poll+0x38f/0x670
 [<c06c9699>] net_rx_action+0x129/0x1b0
 [<c0131eb2>] __do_softirq+0x82/0x100
 [<c0105fc5>] call_on_stack+0x15/0x30
 [<ffffffff>] 0xffffffff

View attachment "config" of type "text/plain" (60035 bytes)