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Date: Wed, 11 Nov 2009 12:38:51 +0100 From: Karl Hiramoto <karl@...amoto.org> To: netdev@...r.kernel.org Subject: Re: Oops from tcp_collapse() when using splice() Karl Hiramoto wrote: > Hi, the following oops occurs with both 2.6.28.9 and 2.6.30.9 > > userspace program is using splice() on two tcp sockets. > Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 817 [#1] Modules linked in: pppoe pppox br2684 crc_ccitt nf_nat_pptp nf_nat_proto_gre nf_conntrack_pptp nf_conntrack_proto_gre af_key ixp4xx_crypto ipt_MASQUERADEc CPU: 0 Not tainted (2.6.30.9 #1) PC is at tcp_collapse+0x268/0x338 LR is at 0xc2f047c0 pc : [<c020be4c>] lr : [<c2f047c0>] psr: 80000013 sp : c0323c90 ip : c3881d40 fp : c0323cc8 r10: c6762c80 r9 : 00000e2c r8 : c3b85920 r7 : c2f047a0 r6 : c3b85900 r5 : c2f04780 r4 : 00000074 r3 : 00000000 r2 : c6766d84 r1 : 00004104 r0 : c2f04780 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 000039ff Table: 02cd0000 DAC: 00000017 Process swapper (pid: 0, stack limit = 0xc0322260) Stack: (0xc0323c90 to 0xc0324000) 3c80: c3881d40 c3881d40 c3881ce0 ffffc476 3ca0: c3881ce0 c3881ce0 0000059a c2dd2d80 c2ea1054 c3882040 c2ea1054 c0323d0c 3cc0: c0323ccc c020c114 c020bbf0 c6762c80 c6773da0 b87d516b 00000000 c3882040 3ce0: 00000000 000008ec c3881ce0 0000059a c2dd2d80 c2ea1054 c2dd2da0 c2ea1054 3d00: c0323d40 c0323d10 c020c394 c020bf28 c2e46000 ffffffff c3881ce0 c2dd2d80 3d20: 0000059a c2ea1054 00000020 c2dd2da0 c2ea1054 c0323d6c c0323d44 c02102f8 3d40: c020c1b4 00000000 c2dd2d80 c3881ce0 c2ea1054 c03576fc c2ea1040 0000e76d 3d60: c0323d9c c0323d70 c0215770 c020fddc bf11dcfc 00000000 c0323d9c c0323d88 3d80: 00000000 c2dd2d80 c3881ce0 c2ea1054 c0323dd8 c0323da0 c021750c c021574c 3da0: 0a430f30 0000e76d 00000005 c0357e58 c033dd04 c2dd2d80 00000000 c03576fc 3dc0: c0358518 c033b870 00000000 c0323dfc c0323ddc c01fb6ac c0216e6c c2dd2d80 3de0: c2dd2d80 c2ea1040 c2e46000 c0357a40 c0323e1c c0323e00 c01fbb68 c01fb55c 3e00: 00000000 c01fb550 80000000 c0357a20 c0323e48 c0323e20 c01fb52c c01fbaf8 3e20: c2e46000 c2dd2d80 c0357a20 c2dd2d80 c03576fc c2e46000 c0357a40 c0323e74 3e40: c0323e4c c01fbab8 c01fb22c 00000000 c01fb220 80000000 c0357a20 c2dd2d80 3e60: c2e46000 00000800 c0323ea4 c0323e78 c01ddf24 c01fb86c c2e57a00 c0323edc 3e80: 00000002 c033b888 ffffabd7 00000040 00000000 c033b86c c0323ed0 c0323ea8 3ea0: c01ddff4 c01ddb9c c033b888 00000040 00000100 0000012c c033b86c c033b87c 3ec0: ffffabd9 c0323efc c0323ed4 c01e095c c01ddf74 c0322000 0000000c 00000100 3ee0: 00000001 00000009 c034b72c 00000000 c0323f30 c0323f00 c00359dc c01e0900 3f00: c0323f0c c0029608 00000003 00000000 00000008 c03426a8 0001c608 690541f1 3f20: 0001c49c c0323f40 c0323f34 c0035c98 c003597c c0323f58 c0323f44 c0020058 3f40: c0035c60 ffffffff 0000001f c0323fc0 c0323f5c c00209c4 c002000c c03273c8 3f60: c381a900 a0000013 00000000 c0021de8 c0322000 c0021de8 c03426a8 0001c608 3f80: 690541f1 0001c49c c0323fc0 c0323fa4 c0323fa4 c0021cb0 c0021de8 60000013 3fa0: ffffffff c034dfc4 c0342450 c001dd60 c0326344 c0323fd0 c0323fc4 c0263be4 3fc0: c0021c80 c0323ff4 c0323fd4 c00089c0 c0263b98 c00083ac c001dd60 000039fd 3fe0: c03426d8 c001e164 00000000 c0323ff8 00008034 c00087bc 00000000 00000000 Backtrace: [<c020bbe4>] (tcp_collapse+0x0/0x338) from [<c020c114>] (tcp_prune_queue+0x1f8/0x28c) [<c020bf1c>] (tcp_prune_queue+0x0/0x28c) from [<c020c394>] (tcp_data_queue+0x1ec/0xc3c) [<c020c1a8>] (tcp_data_queue+0x0/0xc3c) from [<c02102f8>] (tcp_rcv_established+0x528/0x5e0) [<c020fdd0>] (tcp_rcv_established+0x0/0x5e0) from [<c0215770>] (tcp_v4_do_rcv+0x30/0x1c4) [<c0215740>] (tcp_v4_do_rcv+0x0/0x1c4) from [<c021750c>] (tcp_v4_rcv+0x6ac/0x754) r7:c2ea1054 r6:c3881ce0 r5:c2dd2d80 r4:00000000 [<c0216e60>] (tcp_v4_rcv+0x0/0x754) from [<c01fb6ac>] (ip_local_deliver_finish+0x15c/0x21c) [<c01fb550>] (ip_local_deliver_finish+0x0/0x21c) from [<c01fbb68>] (ip_local_deliver+0x7c/0x88) r8:c0357a40 r7:c2e46000 r6:c2ea1040 r5:c2dd2d80 r4:c2dd2d80 [<c01fbaec>] (ip_local_deliver+0x0/0x88) from [<c01fb52c>] (ip_rcv_finish+0x30c/0x330) r4:c0357a20 [<c01fb220>] (ip_rcv_finish+0x0/0x330) from [<c01fbab8>] (ip_rcv+0x258/0x28c) r8:c0357a40 r7:c2e46000 r6:c03576fc r5:c2dd2d80 r4:c0357a20 [<c01fb860>] (ip_rcv+0x0/0x28c) from [<c01ddf24>] (netif_receive_skb+0x394/0x3d8) r7:00000800 r6:c2e46000 r5:c2dd2d80 r4:c0357a20 [<c01ddb90>] (netif_receive_skb+0x0/0x3d8) from [<c01ddff4>] (process_backlog+0x8c/0xd8) [<c01ddf68>] (process_backlog+0x0/0xd8) from [<c01e095c>] (net_rx_action+0x68/0x188) [<c01e08f4>] (net_rx_action+0x0/0x188) from [<c00359dc>] (__do_softirq+0x6c/0xf8) [<c0035970>] (__do_softirq+0x0/0xf8) from [<c0035c98>] (irq_exit+0x44/0x4c) [<c0035c54>] (irq_exit+0x0/0x4c) from [<c0020058>] (asm_do_IRQ+0x58/0x6c) [<c0020000>] (asm_do_IRQ+0x0/0x6c) from [<c00209c4>] (__irq_svc+0x24/0x80) Exception stack(0xc0323f5c to 0xc0323fa4) 3f40: c03273c8 3f60: c381a900 a0000013 00000000 c0021de8 c0322000 c0021de8 c03426a8 0001c608 3f80: 690541f1 0001c49c c0323fc0 c0323fa4 c0323fa4 c0021cb0 c0021de8 60000013 3fa0: ffffffff r5:0000001f r4:ffffffff [<c0021c74>] (cpu_idle+0x0/0x58) from [<c0263be4>] (rest_init+0x58/0x6c) r7:c0326344 r6:c001dd60 r5:c0342450 r4:c034dfc4 [<c0263b8c>] (rest_init+0x0/0x6c) from [<c00089c0>] (start_kernel+0x210/0x264) [<c00087b0>] (start_kernel+0x0/0x264) from [<00008034>] (0x8034) r6:c001e164 r5:c03426d8 r4:000039fd Code: e50b302c e06a1002 5a000002 e3a03000 (e5833000) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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