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Message-ID: <4A422F1E.3050208@in.ibm.com>
Date: Wed, 24 Jun 2009 19:20:22 +0530
From: Sachin Sant <sachinp@...ibm.com>
To: netdev <netdev@...r.kernel.org>
CC: serue@...ux.vnet.ibm.com, David Miller <davem@...emloft.net>,
matthltc@...ibm.com
Subject: [2.6.30-git21] Network Namespace test failure
While executing Newtork namespace tests from LTP[1] May release,
the machine crashed with following o/p. This is a PowerPC
blade(Power 6)
cpu 0x1: Vector: 300 (Data Access) at [c00000000fff7310]
pc: d0000000021c09dc: .veth_xmit+0x90/0x26c [veth]
lr: d0000000021c09ac: .veth_xmit+0x60/0x26c [veth]
sp: c00000000fff7590
msr: 8000000000009032
dar: 7
dsisr: 40000000
current = 0xc00000004045bc80
paca = 0xc000000000ff2600
pid = 0, comm = swapper
enter ? for help
[c00000000fff7640] c00000000051b2b4 .dev_hard_start_xmit+0x2c4/0x3d8
[c00000000fff7710] c000000000539288 .__qdisc_run+0x184/0x330
[c00000000fff7800] c00000000051b894 .dev_queue_xmit+0x31c/0x4d4
[c00000000fff78a0] c0000000005249e8 .neigh_resolve_output+0x394/0x408
[c00000000fff7970] d0000000020c3168 .ip6_output_finish+0xd8/0x16c [ipv6]
[c00000000fff7a20] d0000000020c5f60 .ip6_output2+0x2b8/0x2e0 [ipv6]
[c00000000fff7ac0] d0000000020c6d60 .ip6_output+0xdd8/0xe38 [ipv6]
[c00000000fff7bd0] d0000000020e8af4 .mld_sendpack+0x388/0x590 [ipv6]
[c00000000fff7ce0] d0000000020e9f24 .mld_ifc_timer_expire+0x300/0x378 [ipv6]
[c00000000fff7db0] c0000000000abca0 .run_timer_softirq+0x200/0x2e0
[c00000000fff7eb0] c0000000000a47e4 .__do_softirq+0x15c/0x298
[c00000000fff7f90] c000000000030bb4 .call_do_softirq+0x14/0x24
[c00000007e4338f0] c00000000000e5d8 .do_softirq+0x98/0xe4
[c00000007e433990] c0000000000a4460 .irq_exit+0x64/0xc4
[c00000007e433a10] c00000000002d278 .timer_interrupt+0xe4/0x114
[c00000007e433aa0] c000000000003718 decrementer_common+0x118/0x180
--- Exception: 901 (Decrementer) at c00000000000e528
.raw_local_irq_restore+0x74/0x8c
[c00000007e433e20] c0000000000144e8 .cpu_idle+0x118/0x1bc
[c00000007e433ec0] c0000000005cff14 .start_secondary+0x384/0x3c8
[c00000007e433f90] c0000000000082d4 .start_secondary_prolog+0x10/0x14
1:mon> r
R00 = 0000000000001003 R16 = c000000000f91200
R01 = c00000000fff7590 R17 = 0000000000000000
R02 = d0000000021cace8 R18 = ffffffffffffffff
R03 = c00000003f4e5780 R19 = 0000000000000000
R04 = c00000003eb84a80 R20 = c00000003d2bd39c
R05 = c00000003d438580 R21 = c00000000fff4080
R06 = c0000000374a35c4 R22 = 0000000100009dea
R07 = c000000037336f80 R23 = d0000000021c25f0
R08 = 0000000000000000 R24 = c00000003d438580
R09 = 3fffffffc8e93a7f R25 = c00000003eb88a80
R10 = ffffffffffffffff R26 = c00000003eb85080
R11 = 0000000000000008 R27 = c00000003ecd3780
R12 = d0000000020ffa30 R28 = c00000003d438580
R13 = c000000000ff2600 R29 = c00000003ecd3780
R14 = 0000000000000000 R30 = c000000000e97a40
R15 = 000000000767e1e8 R31 = c00000000fff7590
pc = d0000000021c09dc .veth_xmit+0x90/0x26c [veth]
lr = d0000000021c09ac .veth_xmit+0x60/0x26c [veth]
msr = 8000000000009032 cr = 24000044
ctr = c000000000506dc0 xer = 0000000020000001 trap = 300
dar = 0000000000000007 dsisr = 40000000
1:mon>
1:mon> di $.veth_xmit
... SNIP ....
d0000000021c096c f821ff51 stdu r1,-176(r1)
d0000000021c0970 7c3f0b78 mr r31,r1
d0000000021c0974 7c7d1b78 mr r29,r3
d0000000021c0978 7c992378 mr r25,r4
d0000000021c097c 48000008 b d0000000021c0984 #
.veth_xmit+0x38/0x26c [veth]
d0000000021c0980 e8410028 ld r2,40(r1)
d0000000021c0984 e93d0088 ld r9,136(r29)
d0000000021c0988 2fa90000 cmpdi cr7,r9,0
1:mon>
d0000000021c098c 419e0024 beq cr7,d0000000021c09b0 #
.veth_xmit+0x64/0x26c [veth]
d0000000021c0990 e8090000 ld r0,0(r9)
d0000000021c0994 f8410028 std r2,40(r1)
....... SNIP .......
d0000000021c09d0 796b1f24 rldicr r11,r11,3,60
d0000000021c09d4 7d4a50f8 not r10,r10
d0000000021c09d8 e93a0008 ld r9,8(r26)
d0000000021c09dc 7f8b502a ldx r28,r11,r10
^^^^^^^ points to %PC
The corresponding c code (veth_xmit) is:
9cc: 3b 44 06 00 addi r26,r4,1536
cpu = smp_processor_id();
stats = per_cpu_ptr(priv->stats, cpu);
9d0: 79 6b 1f 24 rldicr r11,r11,3,60
9d4: 7d 4a 50 f8 not r10,r10
rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
9d8: e9 3a 00 08 ld r9,8(r26)
priv = netdev_priv(dev);
rcv = priv->peer;
rcv_priv = netdev_priv(rcv);
cpu = smp_processor_id();
stats = per_cpu_ptr(priv->stats, cpu);
9dc: 7f 8b 50 2a ldx r28,r11,r10
rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
^^^^^ PC points to this instruction ^^^^^
I haven't tried these tests earlier so not sure if this
is a new problem or not. Let me know if there is any
other information you would like.
Thanks
-Sachin
[1] -> http://downloads.sourceforge.net/ltp/ltp-full-20090531.tgz
--
---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------
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