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Date: Thu, 28 Oct 2010 05:29:23 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Nishanth Aravamudan <nacc@...ibm.com>
Cc: Divy Le Ray <divy@...lsio.com>, sonnyrao@...ibm.com,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: cxgb3: kernel access of bad area with v2.6.36-6794-g12ba8d1
Le mercredi 27 octobre 2010 à 18:54 -0700, Nishanth Aravamudan a écrit :
> Hi,
>
> I'm seeing the following trace w/ current git on a machine in our lab:
>
> Chelsio T3 Network Driver - version 1.1.4-ko
> cxgb3 0003:01:00.0: enabling device (0140 -> 0142)
> Unable to handle kernel paging request for data at address 0x00000010
> Faulting instruction address: 0xd000000008473ae8
> Oops: Kernel access of bad area, sig: 11 [#1]
> SMP NR_CPUS=32 NUMA pSeries
> last sysfs file: /sys/devices/virtual/block/dm-0/dev
> Modules linked in: cxgb3(+) mdio ehea ib_ehca ib_core ext4 jbd2 mbcache sd_mod crc_t10dif ipr dm_mod [last unloaded: scsi_wait_scan]
> NIP: d000000008473ae8 LR: d000000008473ac4 CTR: c0000000004398a0
> REGS: c0000007a157f190 TRAP: 0300 Not tainted (2.6.36)
> MSR: 8000000000009032 <EE,ME,IR,DR> CR: 24424444 XER: 00000000
> DAR: 0000000000000010, DSISR: 0000000040000000
> TASK = c0000007a3755290[741] 'modprobe' THREAD: c0000007a157c000 CPU: 24
> GPR00: 0000000000000000 c0000007a157f410 d000000008486978 c0000007a526c000
> GPR04: c0000000006d25dd c0000007a526c005 c0000007a526c29e 0000000000000002
> GPR08: 0000000000000004 0000000000000010 c0000007a526c0a0 0000000000000000
> GPR12: d000000008474aa8 c00000000eed3c00 d00000000847aeb8 0000000000000001
> GPR16: 0000000000001000 0000000000000000 d000000008477aa8 00003c047ef7e000
> GPR20: c0000007a8b7d280 c0000007a8b7d310 d00000000847d1c0 d00000000847d1d8
> GPR24: 0000000000000003 00003c047ef7efff 0000000000000001 c0000007a3c1c000
> GPR28: 0000000000000000 c0000007a526c000 d000000008484210 c0000007a3c1c000
> NIP [d000000008473ae8] .init_one+0x510/0xb7c [cxgb3]
> LR [d000000008473ac4] .init_one+0x4ec/0xb7c [cxgb3]
> Call Trace:
> [c0000007a157f410] [d000000008473ac4] .init_one+0x4ec/0xb7c [cxgb3] (unreliable)
> [c0000007a157f560] [c0000000002e40bc] .local_pci_probe+0x7c/0x100
> [c0000007a157f5f0] [c0000000002e5018] .pci_device_probe+0x148/0x150
> [c0000007a157f6a0] [c00000000034df68] .driver_probe_device+0x128/0x330
> [c0000007a157f750] [c00000000034e27c] .__driver_attach+0x10c/0x110
> [c0000007a157f7e0] [c00000000034d15c] .bus_for_each_dev+0x9c/0xf0
> [c0000007a157f890] [c00000000034dbc8] .driver_attach+0x28/0x40
> [c0000007a157f910] [c00000000034c648] .bus_add_driver+0x218/0x3d0
> [c0000007a157f9c0] [c00000000034e718] .driver_register+0x98/0x1d0
> [c0000007a157fa60] [c0000000002e5354] .__pci_register_driver+0x64/0x140
> [c0000007a157fb00] [d000000008474278] .cxgb3_init_module+0x2c/0x44 [cxgb3]
> [c0000007a157fb80] [c000000000009754] .do_one_initcall+0x64/0x1e0
> [c0000007a157fc40] [c0000000000d28b8] .SyS_init_module+0x1b8/0x1790
> [c0000007a157fe30] [c000000000008564] syscall_exit+0x0/0x40
> Instruction dump:
> 9b890018 9b090019 48000fe9 e8410028 801d0308 2f800000 419e003c 39600000
> e93d0300 796045e4 7d290214 39290010 <7c0048a8> 7c00d378 7c0049ad 40a2fff4
> ---[ end trace 2a530df8c4ad3d70 ]---
> udevd-work[600]: '/sbin/modprobe -b pci:v00001425d00000030sv00001014sd0000038Cbc02sc00i00' unexpected exit with status 0x000b
>
> I did an objdump -ldr of cxgb3.ko and:
>
>
> 4c0: 48 00 00 01 bl 4c0 <.init_one+0x4c0>
> 4c0: R_PPC64_REL24 .alloc_etherdev_mq
> 4c4: 60 00 00 00 nop
> 4c8: 7c 7d 1b 79 mr. r29,r3
> 4cc: 41 82 03 28 beq- 7f4 <.init_one+0x7f4>
> 4d0: 39 3d 07 00 addi r9,r29,1792
> 4d4: fa bd 03 f8 std r21,1016(r29)
> 4d8: fb bb 32 08 std r29,12808(r27)
> 4dc: fb fd 07 00 std r31,1792(r29)
> 4e0: 9b 89 00 18 stb r28,24(r9)
> 4e4: 9b 09 00 19 stb r24,25(r9)
> 4e8: 48 00 00 01 bl 4e8 <.init_one+0x4e8>
> 4e8: R_PPC64_REL24 .netif_carrier_off
> 4ec: 60 00 00 00 nop
> 4f0: 80 1d 03 08 lwz r0,776(r29)
> 4f4: 2f 80 00 00 cmpwi cr7,r0,0
> 4f8: 41 9e 00 3c beq- cr7,534 <.init_one+0x534>
> 4fc: 39 60 00 00 li r11,0
> 500: e9 3d 03 00 ld r9,768(r29)
> 504: 79 60 45 e4 rldicr r0,r11,8,55
> 508: 7d 29 02 14 add r9,r9,r0
> 50c: 39 29 00 10 addi r9,r9,16
> 510: 7c 00 48 a8 ldarx r0,0,r9
> 514: 7c 00 d3 78 or r0,r0,r26
> 518: 7c 00 49 ad stdcx. r0,0,r9
> 51c: 40 a2 ff f4 bne- 510 <.init_one+0x510>
>
> So I'm guessing it's somewhere in here:
>
> for (i = 0; i < ai->nports0 + ai->nports1; ++i) {
> struct net_device *netdev;
>
> netdev = alloc_etherdev_mq(sizeof(struct port_info), SGE_QSETS);
> if (!netdev) {
> err = -ENOMEM;
> goto out_free_dev;
> }
>
> SET_NETDEV_DEV(netdev, &pdev->dev);
>
> adapter->port[i] = netdev;
> pi = netdev_priv(netdev);
> pi->adapter = adapter;
> pi->rx_offload = T3_RX_CSUM | T3_LRO;
> pi->port_id = i;
> netif_carrier_off(netdev);
> netif_tx_stop_all_queues(netdev);
> netdev->irq = pdev->irq;
> netdev->mem_start = mmio_start;
> netdev->mem_end = mmio_start + mmio_len - 1;
> netdev->features |= NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
> netdev->features |= NETIF_F_GRO;
> if (pci_using_dac)
> netdev->features |= NETIF_F_HIGHDMA;
>
> netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
> netdev->netdev_ops = &cxgb_netdev_ops;
> SET_ETHTOOL_OPS(netdev, &cxgb_ethtool_ops);
> }
>
> Well, presuming the trace is mostly accurate? I'm not sure what else is
> needed to determine the problem further. I'm building 2.6.36 as I write
> this. But it doesn't seem like this code has changed much and I had a
> working kernel around 2.6.36-rc7...
>
It seems this crash is because alloc_etherdev_mq() (alloc_netdev_mq())
not anymore allocates tx_queues.
So netif_tx_stop_all_queues(netdev) is crashing, accessing a NULL
pointer in your driver.
netif_tx_stop_all_queues(netdev) should be called only once device is
registered : netif_alloc_netdev_queues() is called from
register_netdevice()
Take a look at commit 8f6d9f40476895571 to have an example of how to fix
this problem.
Thanks
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