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Re: [Xen-users] No DomU boot after upgrade to xen 4.0

To: Matej Zary <zary@xxxxxxxxx>
Subject: Re: [Xen-users] No DomU boot after upgrade to xen 4.0
From: Ralf Hornik <ralf@xxxxxxxxxxxxxx>
Date: Mon, 26 Apr 2010 18:10:45 +0200
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Matej Zary schrieb:
You cand find nice "howto" for 2.6.31 kernel compilation (also
with .config files) in the second half of this page -
http://wiki.xensource.com/xenwiki/XenParavirtOps.

I would still do "make menuconfig" with these provided .config files,
IIRC there are some debug options turned on, which can negatively impact
performance (which could matter on production servers).
Thank you Matej. With that howto I built a working kernel.
But why is the TUN disabled? I use a quite standard config for my hvms which then always will fail.

Another problem:

Sometimes I get this trace while booting.

[  257.653395] BUG: scheduling while atomic: xenwatch/28/0x00000002
[  257.791008] Modules linked in: [last unloaded: scsi_wait_scan]
[  257.926138] Pid: 28, comm: xenwatch Not tainted 2.6.31.13 #2
[  258.062008] Call Trace:
[  258.118138]  [<ffffffff81060a70>] __schedule_bug+0x5c/0x60
[  258.242138]  [<ffffffff8159c8af>] schedule+0xd1/0x8ec
[  258.359139]  [<ffffffff8120a347>] ? kvasprintf+0x45/0x6e
[  258.481140]  [<ffffffff8159e7d5>] ? _spin_unlock_irqrestore+0x34/0x3f
[  258.631139]  [<ffffffff8126bd80>] read_reply+0x9a/0x12f
[  258.749139]  [<ffffffff81080dfb>] ? autoremove_wake_function+0x0/0x38
[  258.899139]  [<ffffffff8126bfb8>] xs_talkv+0xc7/0x184
[  259.014140]  [<ffffffff8102ef25>] ? xen_force_evtchn_callback+0xd/0xf
[  259.162139]  [<ffffffff8126c19d>] xs_single+0x42/0x44
[  259.278138]  [<ffffffff8126c908>] xenbus_read+0x3d/0x54
[  259.404139]  [<ffffffff8126c9f5>] xenbus_gather+0xd6/0x166
[  259.531139]  [<ffffffff8126c8b7>] ? xenbus_printf+0xdd/0xf1
[  259.659139]  [<ffffffff8103034d>] ? kzalloc+0xf/0x11
[  259.772138]  [<ffffffff8126a8e5>] xenbus_read_driver_state+0x29/0x39
[  259.919138]  [<ffffffff81276d66>] pciback_attach+0x49/0x1b5
[  260.048138]  [<ffffffff8126ad25>] ? xenbus_switch_state+0x5d/0x97
[  260.187139]  [<ffffffff812773dd>] pciback_be_watch+0x251/0x263
[  260.321139]  [<ffffffff8159e7d5>] ? _spin_unlock_irqrestore+0x34/0x3f
[  260.469139]  [<ffffffff81205ea6>] ? __up_read+0x92/0x9c
[  260.593139]  [<ffffffff81084273>] ? up_read+0x9/0xb
[  260.706138]  [<ffffffff8126c5a3>] ? register_xenbus_watch+0xfd/0x108
[  260.852138]  [<ffffffff812778b8>] pciback_xenbus_probe+0x143/0x167
[  260.994139]  [<ffffffff8126d8d6>] xenbus_dev_probe+0x96/0x134
[  261.127008]  [<ffffffff812dccba>] driver_probe_device+0x97/0x13c
[  261.263139]  [<ffffffff812dcdda>] ? __device_attach+0x0/0x3c
[  261.395139]  [<ffffffff812dce0d>] __device_attach+0x33/0x3c
[  261.523138]  [<ffffffff812dc2c4>] bus_for_each_drv+0x51/0x88
[  261.654139]  [<ffffffff812dce98>] device_attach+0x5e/0x73
[  261.776138]  [<ffffffff812dc133>] bus_probe_device+0x1f/0x36
[  261.910139]  [<ffffffff812dac43>] device_add+0x3bd/0x546
[  262.031139]  [<ffffffff812026fa>] ? kobject_init+0x43/0x83
[  262.159138]  [<ffffffff812dade5>] device_register+0x19/0x1d
[  262.285008]  [<ffffffff8126d496>] xenbus_probe_node+0x126/0x1aa
[  262.422139]  [<ffffffff812dc5cb>] ? bus_for_each_dev+0x75/0x85
[  262.556138]  [<ffffffff8126d683>] xenbus_dev_changed+0x169/0x187
[  262.694139]  [<ffffffff8126db2d>] backend_changed+0x16/0x18
[  262.821139]  [<ffffffff8126bcb3>] xenwatch_thread+0x11a/0x14d
[  262.955139]  [<ffffffff81080dfb>] ? autoremove_wake_function+0x0/0x38
[  263.110139]  [<ffffffff8159e7d5>] ? _spin_unlock_irqrestore+0x34/0x3f
[  263.259139]  [<ffffffff8126bb99>] ? xenwatch_thread+0x0/0x14d
[  263.390138]  [<ffffffff810809e4>] kthread+0x8f/0x97
[  263.502138]  [<ffffffff81034d9a>] child_rip+0xa/0x20
[  263.617139]  [<ffffffff81033f27>] ? int_ret_from_sys_call+0x7/0x1b
[  263.760008]  [<ffffffff810346e1>] ? retint_restore_args+0x5/0x6
[  263.894138]  [<ffffffff81034d90>] ? child_rip+0x0/0x20

It is a known bug but how to solve this?
Best regards

Ralf

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