Fw: [Bug 48701] New: Kernel OOPS when transmitting packets using OVS and DSA

[Stephen Hemminger <shemminger-ZtmgI6mnKB3QT0dZR+AlfA@public.gmane.org>]

Begin forwarded message:

Date: Thu, 11 Oct 2012 16:13:39 +0000 (UTC)
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
To: shemminger-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
Subject: [Bug 48701] New: Kernel OOPS when transmitting packets using OVS and DSA


https://bugzilla.kernel.org/show_bug.cgi?id=48701

           Summary: Kernel OOPS when transmitting packets using OVS and
                    DSA
           Product: Networking
           Version: 2.5
    Kernel Version: 3.6.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: shemminger-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
        ReportedBy: barry-RiHDFbPRhGT6V6G2DxALlg@public.gmane.org
                CC: jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org
        Regression: No


When I compiled the kernel (3.6.1 mainline) with distributed switch
architectural (DSA) and OVS (OpenvSwich), I can pass ping traffic fine, but
larger packets cause an oops.

This is on a Freescale 83XX Processor:
# uname -a
Linux PPCTEST 3.6.1+ #1 PREEMPT Thu Oct 11 08:36:35 PDT 2012 ppc GNU/Linux
# Unable to handle kernel paging request for data at address 0x12000007
Faulting instruction address: 0xc008b5ec
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT SEL B1305
Modules linked in:
NIP: c008b5ec LR: c008b5e0 CTR: c0041a68
REGS: dfffbb30 TRAP: 0300   Not tainted  (3.6.1+)
MSR: 00001032 <ME,IR,DR,RI>  CR: 22048024  XER: 00000000
DAR: 12000007, DSISR: 20000000
TASK = c0407368[0] 'swapper' THREAD: c0424000
GPR00: c008b5e0 dfffbbe0 c0407368 00100100 00000001 dfb91720 000000c3 c040ae80 
GPR08: 00000000 00000000 c0440d30 c07fd000 24048022 101810a0 c03a79b8 c03abacc 
GPR16: c042e474 00200000 dfffbc1c c034be84 c034be6c dfffbc18 00000000 00008100 
GPR24: 00000000 dfabc000 00000000 df9b8384 00009032 dfb91720 00100100 12000007 
NIP [c008b5ec] kfree+0x64/0xd4
LR [c008b5e0] kfree+0x58/0xd4
Call Trace:
[dfffbbe0] [c008b5e0] kfree+0x58/0xd4 (unreliable)
[dfffbbf8] [c0217300] skb_free_head+0x4c/0x5c
[dfffbc00] [c0217bbc] __kfree_skb+0x18/0xbc
[dfffbc10] [c0314c94] do_execute_actions+0x5f8/0x650
[dfffbc78] [c0316158] ovs_dp_process_received_packet+0xbc/0xe8
[dfffbd18] [c0319900] ovs_vport_receive+0x64/0x78
[dfffbd30] [c031a30c] netdev_frame_hook+0xa0/0xb8
[dfffbd48] [c021ff68] __netif_receive_skb+0x50c/0x6d0
[dfffbdb0] [c02f1e1c] dsa_rcv+0x228/0x24c
[dfffbde0] [c02200b8] __netif_receive_skb+0x65c/0x6d0
[dfffbe48] [c0221668] napi_skb_finish+0x38/0x88
[dfffbe58] [c01f5a14] gfar_clean_rx_ring+0x3a4/0x4b0
[dfffbeb8] [c01f87ac] gfar_poll+0x4c0/0x5dc
[dfffbf78] [c0225040] net_rx_action+0x74/0x180
[dfffbfa8] [c001d144] __do_softirq+0xac/0x13c
[dfffbff0] [c000bd20] call_do_softirq+0x14/0x24
[c0425e80] [c000500c] do_softirq+0x70/0xb0
[c0425ea0] [c001d220] irq_exit+0x4c/0x80
[c0425ea8] [c0005158] do_IRQ+0x10c/0x128
[c0425ed0] [c000dce0] ret_from_except+0x0/0x14
--- Exception: 501 at cpu_idle+0x98/0xec
    LR = cpu_idle+0x98/0xec
[c0425f90] [c0007f08] cpu_idle+0x54/0xec (unreliable)
[c0425fa8] [c0003d58] rest_init+0x78/0xa0
[c0425fc0] [c03dc934] start_kernel+0x288/0x29c
[c0425ff0] [00003438] 0x3438
Instruction dump:
5529c9f4 7c09582e 7c695a14 70098000 41a20008 8063001c 83c30014 7cbd2b78 
480fec99 5463103a 7c63f214 83e30058 <813f0000> 801f0004 7f890040 41bc0010 
---[ end trace ffca2b34cb60156e ]---

Kernel panic - not syncing: Fatal exception in interrupt
Rebooting in 10 seconds..

This is 100% repeatable.  

I had to do some small kernel tweaks to get the DSA drivers to find the
hardware, so it is possible I broke something, but unlikely since my changes
were not in this area at all.

Barry

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