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[Xen-users] dom0 kernel panics (bug in kref_get) when trying to boot off

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] dom0 kernel panics (bug in kref_get) when trying to boot off an ataoe device
From: Shadow <sh4d0w@xxxxxxxxx>
Date: Thu, 17 Jan 2008 13:16:28 -0800
Delivery-date: Thu, 17 Jan 2008 13:17:08 -0800
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When I try to boot off an ataoe device, my dom0 kernel panics...... This happens on multiple (identical) machines and I've tried different NIC's. Booting off a local image file is fine.

The VM hangs at this point:
xen-vbd: registered block device major 8
blkfront: sda1: barriers enabled
blkfront: sda2: barriers enabled
netfront: device eth0 has copying receive path.
XENBUS: Device with no driver: device/console/0
EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access will be enabled during recovery.

Basically right before it seems to want to mount the root fs. Anyone have any ideas on how to debug this?

Config:
kernel = "/boot/vmlinuz-2.6.x.y-xenU"
memory = 456
name = "base"
vif = [ '' ]
#dhcp = ""
disk = ['phy:/dev/etherd/e0.0,sda1,w', 'phy:/dev/etherd/e1.0,sda2,w']
root = "/dev/sda1 ro"
extra = "gentoo=nodevfs"

Log from when I start the VM:
Jan 17 13:58:17 phreak xenbr0: port 3(vif1.0) entering disabled state
Jan 17 13:58:17 phreak device vif1.0 left promiscuous mode
Jan 17 13:58:17 phreak xenbr0: port 3(vif1.0) entering disabled state
Jan 17 13:58:17 phreak udev-net.sh: /etc/init.d/net.vif1.0: does not exist or is not executable
Jan 17 13:58:17 phreak logger: /etc/xen/scripts/vif-bridge: offline XENBUS_PATH=backend/vif/1/0
Jan 17 13:58:17 phreak logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/console/1/0
Jan 17 13:58:17 phreak logger: /etc/xen/scripts/block: remove XENBUS_PATH=backend/vbd/1/2049
Jan 17 13:58:17 phreak logger: /etc/xen/scripts/block: remove XENBUS_PATH=backend/vbd/1/2050
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vbd/1/2050
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vbd/1/2049
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/vif-bridge: brctl delif xenbr0 vif1.0 failed
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/vif-bridge: ifconfig vif1.0 down failed
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/vif-bridge: Successful vif-bridge offline for vif1.0, bridge xenbr0.
Jan 17 13:58:18 phreak logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vif/1/0
Jan 17 13:58:24 phreak logger: /etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/2/2049
Jan 17 13:58:24 phreak logger: /etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/2/2050
Jan 17 13:58:24 phreak udev-net.sh: /etc/init.d/net.vif2.0: does not exist or is not executable
Jan 17 13:58:24 phreak logger: /etc/xen/scripts/vif-bridge: online XENBUS_PATH=backend/vif/2/0
Jan 17 13:58:24 phreak device vif2.0 entered promiscuous mode
Jan 17 13:58:24 phreak xenbr0: port 3(vif2.0) entering learning state
Jan 17 13:58:24 phreak xenbr0: topology change detected, propagating
Jan 17 13:58:24 phreak xenbr0: port 3(vif2.0 ) entering forwarding state
Jan 17 13:58:24 phreak logger: /etc/xen/scripts/vif-bridge: Successful vif-bridge online for vif2.0, bridge xenbr0.
Jan 17 13:58:24 phreak logger: /etc/xen/scripts/vif-bridge: Writing backend/vif/2/0/hotplug-status connected to xenstore.
Jan 17 13:58:25 phreak logger: /etc/xen/scripts/block: Writing backend/vbd/2/2050/physical-device 98:100 to xenstore.
Jan 17 13:58:25 phreak logger: /etc/xen/scripts/block: Writing backend/vbd/2/2050/hotplug-status connected to xenstore.
Jan 17 13:58:26 phreak logger: /etc/xen/scripts/block: Writing backend/vbd/2/2049/physical-device 98:0 to xenstore.
Jan 17 13:58:26 phreak logger: /etc/xen/scripts/block: Writing backend/vbd/2/2049/hotplug-status connected to xenstore.
Jan 17 13:58:26 phreak blkback: ring-ref 8, event-channel 6, protocol 1 (x86_32-abi)
Jan 17 13:58:26 phreak blkback: ring-ref 9, event-channel 7, protocol 1 (x86_32-abi)
Jan 17 13:58:26 phreak BUG: at /usr/src/linux- 2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c03d874f>] sock_def_readable+0x39/0x63
Jan 17 13:58:26 phreak [<c042315d>] unix_stream_sendmsg+0x22c/0x2f1
Jan 17 13:58:26 phreak [<c02f89e2>] notify_remote_via_irq+0x27/0x5f
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c010dadb>] send_IPI_mask_bitmask+0x86/0xb8
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c014525c>] find_extend_vma+0x12/0x49
Jan 17 13:58:26 phreak [<c012e678>] get_futex_key+0x3a/0xe3
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c034d2a8>] ahd_search_qinfifo+0xc49/0x1380
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:26 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c03d874f>] sock_def_readable+0x39/0x63
Jan 17 13:58:26 phreak [<c042315d>] unix_stream_sendmsg+0x22c/0x2f1
Jan 17 13:58:26 phreak [<c02f89e2>] notify_remote_via_irq+0x27/0x5f
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c014525c>] find_extend_vma+0x12/0x49
Jan 17 13:58:26 phreak [<c012e678>] get_futex_key+0x3a/0xe3
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:26 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:26 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c03d874f>] sock_def_readable+0x39/0x63
Jan 17 13:58:26 phreak [<c042315d>] unix_stream_sendmsg+0x22c/0x2f1
Jan 17 13:58:26 phreak [<c02f89e2>] notify_remote_via_irq+0x27/0x5f
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c014525c>] find_extend_vma+0x12/0x49
Jan 17 13:58:26 phreak [<c012e678>] get_futex_key+0x3a/0xe3
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:26 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:26 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:26 phreak BUG: at /usr/src/linux- 2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c03d874f>] sock_def_readable+0x39/0x63
Jan 17 13:58:26 phreak [<c042315d>] unix_stream_sendmsg+0x22c/0x2f1
Jan 17 13:58:26 phreak [<c02f89e2>] notify_remote_via_irq+0x27/0x5f
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c014525c>] find_extend_vma+0x12/0x49
Jan 17 13:58:26 phreak [<c012e678>] get_futex_key+0x3a/0xe3
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:26 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:26 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c0350700>] ahd_handle_message_phase+0x66a/0x6fb
Jan 17 13:58:26 phreak [<c034ffa0>] ahd_parse_msg+0xb0f/0xc05
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:26 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c03d874f>] sock_def_readable+0x39/0x63
Jan 17 13:58:26 phreak [<c042315d>] unix_stream_sendmsg+0x22c/0x2f1
Jan 17 13:58:26 phreak [<c02f89e2>] notify_remote_via_irq+0x27/0x5f
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c014525c>] find_extend_vma+0x12/0x49
Jan 17 13:58:26 phreak [<c012e678>] get_futex_key+0x3a/0xe3
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:26 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:26 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:26 phreak BUG: at /usr/src/linux- 2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:26 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:26 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:26 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:26 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:26 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:26 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:26 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:26 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:26 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:26 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:26 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:26 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:26 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:26 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:26 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:27 phreak [<c01039f8>] __switch_to+0x28f/0x332
Jan 17 13:58:27 phreak [<c012f7ed>] do_futex+0x201/0xb42
Jan 17 13:58:27 phreak [<c0438fa1>] __sched_text_start+0x699/0x775
Jan 17 13:58:27 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux- 2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0110700>] k8_flush_garts+0x68/0xab
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux-2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
Jan 17 13:58:27 phreak BUG: at /usr/src/linux- 2.6.20-xen-r6/lib/kref.c:32 kref_get()
Jan 17 13:58:27 phreak [<c0208cd4>] kref_get+0x34/0x3c
Jan 17 13:58:27 phreak [<c0208238>] kobject_get+0xf/0x13
Jan 17 13:58:27 phreak [<c01ffb83>] blk_get_queue+0x1c/0x21
Jan 17 13:58:27 phreak [<c0301ab6>] dispatch_rw_block_io+0x424/0x4e1
Jan 17 13:58:27 phreak [<c02081ea>] kobject_release+0x0/0x8
Jan 17 13:58:27 phreak [<c0208c93>] kref_put+0x60/0x6d
Jan 17 13:58:27 phreak [<c0301eb8>] blkif_schedule+0x345/0x429
Jan 17 13:58:27 phreak [<c0115f88>] try_to_wake_up+0x333/0x33d
Jan 17 13:58:27 phreak [<c0301b73>] blkif_schedule+0x0/0x429
Jan 17 13:58:27 phreak [<c012aacc>] kthread+0xb0/0xd8
Jan 17 13:58:27 phreak [<c012aa1c>] kthread+0x0/0xd8
Jan 17 13:58:27 phreak [<c0104e07>] kernel_thread_helper+0x7/0x10
Jan 17 13:58:27 phreak =======================
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