[Xen-devel] BUG: unable to handle kernel paging request at 0000000000003360 RIP: e030:[<ffffffff817bf0f6>] [<ffffffff817bf0f6>] xenvif_free+0x76/0x130

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

While trying to do some more testing around another crash .. i stumbled upon 
this one:

[  345.470718] BUG: unable to handle kernel paging request at 0000000000003360
[  345.499053] IP: [<ffffffff817bf0f6>] xenvif_free+0x76/0x130
[  345.522732] PGD 358f2067 PUD 37e24067 PMD 0
[  345.542478] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[  345.563071] Modules linked in:
[  345.579180] CPU: 3 PID: 45 Comm: xenwatch Not tainted 
3.15.0-rc8-20140602-net-xendev-bt-mq+ #1
[  345.612170] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS V1.8B1 
09/13/2010
[  345.643065] task: ffff8800593b5ff0 ti: ffff8800593bc000 task.ti: 
ffff8800593bc000
[  345.672641] RIP: e030:[<ffffffff817bf0f6>]  [<ffffffff817bf0f6>] 
xenvif_free+0x76/0x130
[  345.703852] RSP: e02b:ffff8800593bfc28  EFLAGS: 00010246
[  345.727076] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
[  345.755788] RDX: 0000000000000006 RSI: ffff8800593b6810 RDI: ffff8800259238c8
[  345.784424] RBP: ffff8800593bfc68 R08: 0000000000000000 R09: 0000000000000000
[  345.812987] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[  345.841582] R13: 000000000000001e R14: 0000000000000000 R15: 0000000000000000
[  345.870065] FS:  00007f4d54a57700(0000) GS:ffff88005f6c0000(0000) 
knlGS:0000000000000000
[  345.901412] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  345.925621] CR2: 0000000000003360 CR3: 0000000036d9f000 CR4: 0000000000000660
[  345.954129] Stack:
[  345.967337]  0000000000145980 ffff880025923d20 ffff88002595ef28 
ffff8800258767a8
[  345.996573]  ffff88002595eee8 ffff88002595ef28 ffff88002595ef28 
0000000000000000
[  346.025715]  ffff8800593bfc98 ffffffff817bd9d2 ffff8800593bfc98 
ffff88002595ef28
[  346.054781] Call Trace:
[  346.069218]  [<ffffffff817bd9d2>] netback_remove+0x72/0xa0
[  346.093003]  [<ffffffff815813ad>] xenbus_dev_remove+0x3d/0x70
[  346.117571]  [<ffffffff816e9d39>] __device_release_driver+0x69/0xd0
[  346.143518]  [<ffffffff816e9dce>] device_release_driver+0x2e/0x40
[  346.168761]  [<ffffffff816e984b>] bus_remove_device+0x11b/0x160
[  346.193630]  [<ffffffff816e6bdf>] device_del+0x12f/0x1c0
[  346.216612]  [<ffffffff816e6c86>] device_unregister+0x16/0x30
[  346.240830]  [<ffffffff817bdab6>] frontend_changed+0xb6/0x100
[  346.264969]  [<ffffffff81581320>] xenbus_otherend_changed+0xb0/0xc0
[  346.290657]  [<ffffffff8157fe40>] ? xenbus_thread+0x2a0/0x2a0
[  346.314756]  [<ffffffff81581c20>] frontend_changed+0x10/0x20
[  346.338585]  [<ffffffff8157fe85>] xenwatch_thread+0x45/0x130
[  346.362334]  [<ffffffff8110cac0>] ? __init_waitqueue_head+0x60/0x60
[  346.387798]  [<ffffffff810ee3b4>] kthread+0xe4/0x100
[  346.409261]  [<ffffffff810ee2d0>] ? __init_kthread_worker+0x70/0x70
[  346.434570]  [<ffffffff81b9e4fc>] ret_from_fork+0x7c/0xb0
[  346.457333]  [<ffffffff810ee2d0>] ? __init_kthread_worker+0x70/0x70
[  346.482846] Code: 48 83 c0 01 48 69 c0 40 64 03 00 48 89 45 c0 66 0f 1f 44 
00 00 48 8b 45 c8 31 db 4c 8b 60 20 4d 01 f4 0f 1f 00 45 31 ff 49 63 c7 <41> 83 
bc 84 60 33 00 00 ff 74 3f bf e8 03 00 00 83 c3 01 e8 92
[  346.552521] RIP  [<ffffffff817bf0f6>] xenvif_free+0x76/0x130
[  346.576381]  RSP <ffff8800593bfc28>
[  346.593562] CR2: 0000000000003360
[  346.610384] ---[ end trace 83c5864024a0a3c4 ]---

That's on a kernel with xen 3.16 dev pulled in and the netback multiqueue 
series 
applied, haven't seen it before while using this kernel .. so i don't know if i 
can reproduce.


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