[PVE-User] BUG: soft lockup (when using NFS?)

[Giovanni Toraldo]

Hi,

I'm getting some random soft lockup on every VMs on the same period of
the day.

The problem seems related to NFS, although it sounds very strange.

From kern.log, I can see it happens after few hours of backups start
(when it finish to prepare the tar and it probably ship them over nfs to
my nas).

It happened even now, that I've manually started a transfer of a .vmdk
to my NAS over NFS mounted on the host machine.

Linux fs 2.6.32-2-pve #1 SMP Thu Apr 15 10:22:46 CEST 2010 x86_64 GNU/Linux

Kern.log of a guest (Ubuntu lucid amd64, but happen also on Debian Lenny
guests):

[ 1753.790393] BUG: soft lockup - CPU#0 stuck for 86s! [events/0:6]
[ 1753.790406] Modules linked in: fbcon tileblit font bitblit softcursor
joydev lp parport vga16fb vgastate psmouse serio_raw i2c_piix4 usbhid
hid virtio_blk virtio_net floppy virtio_pci virtio_ring virtio
[ 1753.790511] CPU 0:
[ 1753.790513] Modules linked in: fbcon tileblit font bitblit softcursor
joydev lp parport vga16fb vgastate psmouse serio_raw i2c_piix4 usbhid
hid virtio_blk virtio_net floppy virtio_pci virtio_ring virtio
[ 1753.790547] Pid: 6, comm: events/0 Not tainted 2.6.32-24-generic
#38-Ubuntu Bochs
[ 1753.790549] RIP: 0010:[<ffffffffa009f285>]  [<ffffffffa009f285>]
vga_imageblit_expand+0x345/0x420 [vga16fb]
[ 1753.790568] RSP: 0018:ffff88000f915bd0  EFLAGS: 00010246
[ 1753.790570] RAX: 0000000000000003 RBX: ffff88000f915c30 RCX:
ffff880006edca80
[ 1753.790571] RDX: 00000000000003cf RSI: 0000000000000050 RDI:
ffff8800000a9100
[ 1753.790573] RBP: ffffffff81013cae R08: 0000000000000000 R09:
ffff880006edcae0
[ 1753.790574] R10: ffff88000bdabaf0 R11: 0000000000000001 R12:
ffff88000f918000
[ 1753.790575] R13: ffff880001c15bc0 R14: ffff880001c15bc0 R15:
ffffffff8105e932
[ 1753.790580] FS:  0000000000000000(0000) GS:ffff880001c00000(0000)
knlGS:0000000000000000
[ 1753.790581] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 1753.790583] CR2: 00000000025f1088 CR3: 000000000c2f3000 CR4:
00000000000006f0
[ 1753.790591] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 1753.790597] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 1753.790598] Call Trace:
[ 1753.790617]  [<ffffffffa009f385>] ? vga16fb_imageblit+0x25/0x30 [vga16fb]
[ 1753.790622]  [<ffffffffa00ca1c9>] ? soft_cursor+0x1c9/0x270 [softcursor]
[ 1753.790626]  [<ffffffffa00d113b>] ? bit_cursor+0x65b/0x6b8 [bitblit]
[ 1753.790658]  [<ffffffff8105b3f6>] ? update_curr+0xe6/0x1e0
[ 1753.790674]  [<ffffffff8108a39e>] ? down+0x2e/0x50
[ 1753.790682]  [<ffffffffa00e4b7e>] ? fb_flashcursor+0x10e/0x120 [fbcon]
[ 1753.790684]  [<ffffffffa00d0ae0>] ? bit_cursor+0x0/0x6b8 [bitblit]
[ 1753.790687]  [<ffffffffa00e4a70>] ? fb_flashcursor+0x0/0x120 [fbcon]
[ 1753.790694]  [<ffffffff81080867>] ? run_workqueue+0xc7/0x1a0
[ 1753.790696]  [<ffffffff810809e3>] ? worker_thread+0xa3/0x110
[ 1753.790699]  [<ffffffff81085430>] ? autoremove_wake_function+0x0/0x40
[ 1753.790701]  [<ffffffff81080940>] ? worker_thread+0x0/0x110
[ 1753.790703]  [<ffffffff810850b6>] ? kthread+0x96/0xa0
[ 1753.790712]  [<ffffffff810141ea>] ? child_rip+0xa/0x20
[ 1753.790714]  [<ffffffff81085020>] ? kthread+0x0/0xa0
[ 1753.790716]  [<ffffffff810141e0>] ? child_rip+0x0/0x20

-- 
Giovanni Toraldo
http://twitter.com/gionn
http://bit.ly/about-gionn

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