Re: [Xen-devel] Kernel 3.7.0-pre-rc1 kernel BUG at drivers/net/xen-netback/netback.c:405 RIP: e030:[<ffffffff814714f9>] [<ffffffff814714f9>] netbk_gop_frag_copy+0x379/0x380

[konrad <konrad.wilk@xxxxxxxxxx>]

Sorry for top posting - on mobile.

I saw it too yesterday but only on a specific hardware - AMD FX8. What type of 
CPU do you have?  Does xsave=off on Xen line help?

Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:

>Hi Konrad,
>
>Just tested kernel 3.7.0-pre-rc1 but ran into a oops in netback on boot after 
>starting some guests:
>
>[  402.723915] ------------[ cut here ]------------
>[  402.734629] kernel BUG at drivers/net/xen-netback/netback.c:405!
>[  402.744207] invalid opcode: 0000 [#5] PREEMPT SMP
>[  402.752692] Modules linked in:
>[  402.761307] CPU 1
>[  402.761358] Pid: 1329, comm: netback/1 Tainted: G      D      
>3.6.0-pre-rc1-20121005a #1 MSI MS-7640/890FXA-GD70 (MS-7640)
>[  402.778214] RIP: e030:[<ffffffff814714f9>]  [<ffffffff814714f9>] 
>netbk_gop_frag_copy+0x379/0x380
>[  402.786779] RSP: e02b:ffff880037955bb0  EFLAGS: 00010206
>[  402.795183] RAX: 000000000000486a RBX: ffff88003878c9c0 RCX: 
>ffffea0000b3d400
>[  402.803536] RDX: ffff880037955cd0 RSI: ffff880037955d1c RDI: 
>ffff88003878c9c0
>[  402.811867] RBP: ffff880037955c20 R08: 0000000000000000 R09: 
>00000000000042c2
>[  402.820008] R10: 0000000000000000 R11: 0000000000000000 R12: 
>ffff88002f58b100
>[  402.828022] R13: ffff880037955cd0 R14: 00000000000005a8 R15: 
>ffff880037955d1c
>[  402.835927] FS:  00007ffe2ca5b760(0000) GS:ffff88003f840000(0000) 
>knlGS:0000000000000000
>[  402.843826] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
>[  402.851539] CR2: 00007fff99c3b018 CR3: 00000000377c9000 CR4: 
>0000000000000660
>[  402.859251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
>0000000000000000
>[  402.866816] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
>0000000000000400
>[  402.874188] Process netback/1 (pid: 1329, threadinfo ffff880037954000, task 
>ffff8800398c20a0)
>[  402.881621] Stack:
>[  402.888811]  ffff880037955d1c 0000000000000000 ffff88002f58b100 
>ffff88003878c9c0
>[  402.896102]  ffff880000000000 ffff88002cf54000 0000000000000000 
>0000000000000000
>[  402.903320]  ffff880037955c20 ffff88002f58b100 0000000000000001 
>0000000000000010
>[  402.910356] Call Trace:
>[  402.917180]  [<ffffffff81471853>] xen_netbk_rx_action+0x303/0x840
>[  402.924065]  [<ffffffff810acf0d>] ? trace_hardirqs_on+0xd/0x10
>[  402.930776]  [<ffffffff81472d7a>] xen_netbk_kthread+0xba/0xac0
>[  402.937352]  [<ffffffff810957b6>] ? try_to_wake_up+0x1b6/0x310
>[  402.943856]  [<ffffffff810867e0>] ? wake_up_bit+0x40/0x40
>[  402.950173]  [<ffffffff81472cc0>] ? xen_netbk_tx_build_gops+0xa70/0xa70
>[  402.956370]  [<ffffffff81086176>] kthread+0xd6/0xe0
>[  402.962524]  [<ffffffff817f1664>] kernel_thread_helper+0x4/0x10
>[  402.968668]  [<ffffffff817efb37>] ? retint_restore_args+0x13/0x13
>[  402.974735]  [<ffffffff817f1660>] ? gs_change+0x13/0x13
>[  402.980715] Code: b8 01 00 00 00 48 69 d2 b8 b3 00 00 48 8d 84 f8 60 01 00 
>00 48 3b 0c 10 0f 85 de fc ff ff e9 e2 fc ff ff 0f 0b eb fe 0f 0b eb fe <0f> 
>0b eb fe 0f 1f 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89
>[  402.993584] RIP  [<ffffffff814714f9>] netbk_gop_frag_copy+0x379/0x380
>[  403.000075]  RSP <ffff880037955bb0>
>[  403.006603] ---[ end trace 6eada309643a3fc7 ]---
>
>--
>
>Sander
>
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