kernel BUG at drivers/net/xen-netback/netback.c:540!

[Atom2 <ariel.atom2@web2web.at>]

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Hi guys,
I just updated my kernel version for dom0 from 3.13.10 to 3.14.5 (both 
gentoo hardened sources) when one of my virtual machines still running 
on 3.13.10 suddenly froze. At that time I was about to update the kernel 
for my domU when it froze. My XEN version is 4.3.2.

I then tried to shutdown the domU from the dom0 (xl shutdown name) which 
seemingly worked (shutdown messages appeard on the console for the 
domU). A restart threw an error message which I missed to record . In xl 
list however, the old domU line was still there with a name of (null) 
and a state of "--ps-d".

Shutdown of other domUs to be able to restart the machine resulted in 
the same xl list output: name as (null) and "--ps-d" state, although 
according to their log files under /var/lo/xen-consoles they seem to 
stop correctly. What I however noted was that the LVMs for all domUs 
were still open after their shutdown and they [blkback.N.xvdayN] were 
still available in the process list on dom0.

Investigation then revealed that the messages as per the attached file 
had been recorded in dmesg on dom0.

For now I have decided to switch back to kernel version 3.13.10 which 
was running absolutely stable for a number of weeks.

I am more than happy to provide further information if needed.

Thanks Atom2

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[ 6653.419840] ------------[ cut here ]------------
[ 6653.420547] kernel BUG at drivers/net/xen-netback/netback.c:540!
[ 6653.421246] invalid opcode: 0000 [#1] SMP
[ 6653.421957] Modules linked in: md5 i915 cfbfillrect cfbimgblt i2c_algo_bit cfbcopyarea drm_kms_helper drm xhci_hcd 8139too mii i2c_i801 i2c_core
[ 6653.423482] CPU: 0 PID: 4939 Comm: vif5.0 Not tainted 3.14.5-hardened-r2 #1
[ 6653.424257] Hardware name: iEi B199/B199, BIOS B199AR23 09/17/2013
[ 6653.425037] task: ffff880119486c80 ti: ffff880119487198 task.ti: ffff880119487198
[ 6653.425827] RIP: e030:[<ffffffff81480e71>]  [<ffffffff81480e71>] xenvif_rx_action+0x811/0x820
[ 6653.426637] RSP: e02b:ffff8800d32cdd98  EFLAGS: 00010297
[ 6653.427445] RAX: 0000000000000001 RBX: ffff8800d3330740 RCX: 3fffffffffffff00
[ 6653.428278] RDX: 0000000000000013 RSI: ffff8800d5153388 RDI: 0000000000000000
[ 6653.429115] RBP: 0000000000000011 R08: ffff8800d32cddd4 R09: 0000000000000001
[ 6653.429957] R10: 0000160000000000 R11: ffff8800d3330740 R12: 0000000000000011
[ 6653.430796] R13: ffff8800d5153388 R14: ffff8800d32cddd4 R15: ffff8800d3330740
[ 6653.431649] FS:  00007fc94120d700(0000) GS:ffff88011ee00000(0000) knlGS:0000000000000000
[ 6653.432520] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6653.433394] CR2: 00007f986cc730a0 CR3: 00000000d0aa5000 CR4: 0000000000042660
[ 6653.434295] Stack:
[ 6653.435186]  ffff8800d32cddd4 ffff88011ee0f180 ffff8800d32cdde8 000000121a2b15aa
[ 6653.436113]  0002b7e200000011 ffff8800d3337258 0000000000000000 0000000081098185
[ 6653.437053]  ffff8800d32cddd8 ffff8800d32cddd8 ffff8800d51538c8 ffff8800d51538c8
[ 6653.437997] Call Trace:
[ 6653.438925]  [<ffffffff8148299c>] ? xenvif_kthread+0x4c/0x1c0
[ 6653.439868]  [<ffffffff810a7fd0>] ? __wake_up_sync+0x10/0x10
[ 6653.440817]  [<ffffffff81482950>] ? xenvif_stop_queue+0x50/0x50
[ 6653.441772]  [<ffffffff8108facc>] ? kthread+0xbc/0xe0
[ 6653.442735]  [<ffffffff810151f5>] ? sched_clock+0x5/0x10
[ 6653.443694]  [<ffffffff81090000>] ? kthread_should_park+0x10/0x20
[ 6653.444656]  [<ffffffff8108fa10>] ? kthread_freezable_should_stop+0x60/0x60
[ 6653.445637]  [<ffffffff815ea044>] ? ret_from_fork+0x74/0xa0
[ 6653.446627]  [<ffffffff8108fa10>] ? kthread_freezable_should_stop+0x60/0x60
[ 6653.447627] Code: 00 c7 42 0c 00 00 00 00 e9 7c fe ff ff c6 44 24 20 00 e9 a3 f9 ff ff 83 c8 03 e9 1c fb ff ff 31 ed b8 04 00 00 00 e9 f5 fa ff ff <0f> 0b 0f 0b 0f 0b 66 0f 1f 84 00 00 00 00 00 44 8b 87 98 00 00
[ 6653.449830] RIP  [<ffffffff81480e71>] xenvif_rx_action+0x811/0x820
[ 6653.450913]  RSP <ffff8800d32cdd98>
[ 6653.624856] ---[ end trace 5d9a58b0d1c65342 ]---
[ 7006.778776] BUG: unable to handle kernel NULL pointer dereference at            (nil)
[ 7006.779951] IP: [<ffffffff81094a22>] exit_creds+0x12/0x60
[ 7006.781106] PGD 0
[ 7006.782239] Oops: 0000 [#2] SMP
[ 7006.783381] Modules linked in: md5 i915 cfbfillrect cfbimgblt i2c_algo_bit cfbcopyarea drm_kms_helper drm xhci_hcd 8139too mii i2c_i801 i2c_core
[ 7006.785786] CPU: 7 PID: 56 Comm: xenwatch Tainted: G      D      3.14.5-hardened-r2 #1
[ 7006.787009] Hardware name: iEi B199/B199, BIOS B199AR23 09/17/2013
[ 7006.788252] task: ffff88011a3e0f80 ti: ffff88011a3e1498 task.ti: ffff88011a3e1498
[ 7006.789507] RIP: e030:[<ffffffff81094a22>]  [<ffffffff81094a22>] exit_creds+0x12/0x60
[ 7006.790783] RSP: e02b:ffff880119c63d68  EFLAGS: 00010287
[ 7006.792049] RAX: 0000000000000000 RBX: ffff880119486c80 RCX: 0000000000000020
[ 7006.793328] RDX: 0000000000000001 RSI: 0000000080000200 RDI: 0000000000000000
[ 7006.794609] RBP: 0000000000000000 R08: 0000000080000200 R09: ffff88011a578000
[ 7006.795898] R10: 000000000000000e R11: 0000000000000000 R12: ffffffff813c0d70
[ 7006.797179] R13: 0000000000000020 R14: ffff8800d4226880 R15: 0000000000000000
[ 7006.798455] FS:  00007f0ce67f2700(0000) GS:ffff88011efc0000(0000) knlGS:0000000000000000
[ 7006.799733] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7006.801013] CR2: 0000000000000000 CR3: 00000000d47ea000 CR4: 0000000000042660
[ 7006.802294] Stack:
[ 7006.803550]  ffff880119486c80 ffffffff8106b3bc ffff880119c63d78 ffff880119486c80
[ 7006.804816]  0000000000000000 ffffffff8108fddc 0000000000000020 ffffffff00000000
[ 7006.806077]  0000000000000020 ffff8800d3330740 0000000000000020 ffffffff814845b4
[ 7006.807329] Call Trace:
[ 7006.808565]  [<ffffffff8106b3bc>] ? __put_task_struct+0x3c/0x110
[ 7006.809802]  [<ffffffff8108fddc>] ? kthread_stop+0x5c/0x70
[ 7006.811025]  [<ffffffff814845b4>] ? xenvif_disconnect+0x24/0x70
[ 7006.812240]  [<ffffffff81482dd3>] ? set_backend_state+0x103/0x920
[ 7006.813453]  [<ffffffff813bf666>] ? xenbus_read_driver_state+0x26/0x40
[ 7006.814683]  [<ffffffff813c0d70>] ? xs_watch+0x60/0x60
[ 7006.815905]  [<ffffffff813c0df2>] ? xenwatch_thread+0x82/0x140
[ 7006.817130]  [<ffffffff810a7fd0>] ? __wake_up_sync+0x10/0x10
[ 7006.818333]  [<ffffffff8108facc>] ? kthread+0xbc/0xe0
[ 7006.819529]  [<ffffffff810151f5>] ? sched_clock+0x5/0x10
[ 7006.820714]  [<ffffffff81090000>] ? kthread_should_park+0x10/0x20
[ 7006.821887]  [<ffffffff8108fa10>] ? kthread_freezable_should_stop+0x60/0x60
[ 7006.823054]  [<ffffffff815ea044>] ? ret_from_fork+0x74/0xa0
[ 7006.824216]  [<ffffffff8108fa10>] ? kthread_freezable_should_stop+0x60/0x60
[ 7006.825377] Code: 0f 85 72 fe ff ff 85 c0 0f 84 8e fe ff ff e9 65 fe ff ff 0f 0b 0f 0b 66 90 53 48 89 fb 48 8b 87 e8 06 00 00 48 8b bf 50 06 00 00 <8b> 00 48 c7 83 50 06 00 00 00 00 00 00 f0 ff 0f 74 1c 48 8b bb
[ 7006.827940] RIP  [<ffffffff81094a22>] exit_creds+0x12/0x60
[ 7006.829167]  RSP <ffff880119c63d68>
[ 7006.830389] CR2: 0000000000000000
[ 7006.831605] ---[ end trace 5d9a58b0d1c65343 ]---
[ 7006.832975] xenbr0: port 6(vif5.0) entered disabled state

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