Re: [Xen-devel] [RFC] [PATCH] xen/blkback: add locking in statistics sysfs show functions

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Apr 20, 2012 at 07:21:13PM +0000, Matt Wilson wrote:
> This is a port of a patch in the XenoLinux 2.6.18 tree:
> http://xenbits.xen.org/hg/linux-2.6.18-xen.hg/rev/f47c07325a56
> 
> Fix blkback sysfs race

So with this patch I keep on getting this:

[  128.274290] switch: port 2(vif1.0) entered disabled state
[  128.855442] BUG: sleeping function called from invalid context at 
/home/konrad/ssd/linux/kernel/mutex.c:85
[  128.855628] in_atomic(): 1, irqs_disabled(): 0, pid: 46, name: xenwatch
[  128.855757] Pid: 46, comm: xenwatch Tainted: G           O 
3.4.0-rc4upstream-00103-g7e4325c-dirty #1
[  128.855917] Call Trace:
[  128.856062]  [<ffffffff810983ea>] __might_sleep+0xda/0x100
[  128.856215]  [<ffffffff815a9267>] mutex_lock+0x27/0x50
[  128.856351]  [<ffffffff811b3039>] sysfs_get_dirent+0x29/0x80
[  128.856495]  [<ffffffff811b4d7b>] sysfs_remove_group+0x2b/0x100
[  128.856626]  [<ffffffff81393a20>] xenvbd_sysfs_delif+0x20/0x50
[  128.856756]  [<ffffffff81394518>] xen_blkbk_remove+0xe8/0xf0
[  128.856895]  [<ffffffff8131c768>] xenbus_dev_remove+0x38/0x70
[  128.857041]  [<ffffffff81381601>] __device_release_driver+0x61/0xc0
[  128.857177]  [<ffffffff81381778>] device_release_driver+0x28/0x40
[  128.857323]  [<ffffffff81380896>] bus_remove_device+0x106/0x140
[  128.857459]  [<ffffffff8137e868>] device_del+0x118/0x1c0
[  128.857580]  [<ffffffff8137e921>] device_unregister+0x11/0x20
[  128.857712]  [<ffffffff8139376a>] frontend_changed+0xba/0x350
[  128.857851]  [<ffffffff810337f9>] ? xen_irq_enable_direct_reloc+0x4/0x4
[  128.857982]  [<ffffffff8109928d>] ? finish_task_switch+0x4d/0x100
[  128.858106]  [<ffffffff8131ca18>] xenbus_otherend_changed+0xa8/0xb0
[  128.858236]  [<ffffffff815ab629>] ? _raw_spin_unlock_irqrestore+0x19/0x30
[  128.858368]  [<ffffffff8131cc2b>] frontend_changed+0xb/0x10
[  128.858522]  [<ffffffff8131ad3b>] xenwatch_thread+0xcb/0x190
[  128.858655]  [<ffffffff8108ec40>] ? wake_up_bit+0x40/0x40
[  128.858801]  [<ffffffff8131ac70>] ? xenbus_thread+0x320/0x320
[  128.858965]  [<ffffffff8108e716>] kthread+0x96/0xa0
[  128.859097]  [<ffffffff815b3564>] kernel_thread_helper+0x4/0x10
[  128.859235]  [<ffffffff815abb78>] ? retint_restore_args+0x5/0x6
[  128.859371]  [<ffffffff815b3560>] ? gs_change+0x13/0x13
[  128.859542] BUG: scheduling while atomic: xenwatch/46/0x00000002

whenever a guest is powered off.

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