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Re: [Xen-users] Re: [Xen-devel] tap:qcow causes dom-U to hang in 3.0.3

To: Julian Chesterfield <jac90@xxxxxxxxx>
Subject: Re: [Xen-users] Re: [Xen-devel] tap:qcow causes dom-U to hang in 3.0.3
From: Roland Paterson-Jones <roland@xxxxxxxxxxxx>
Date: Tue, 14 Nov 2006 12:10:28 +0200
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Julian Chesterfield wrote:


There's a bunch of DPRINTFs in the code which send debug output to syslog. You can play with syslog settings to switch on the debug messages and direct them to a log file.

Here is another clue from syslog. Below is the full log, but the hang seems to accur when the following log messages are triggered (there's a bunch of them at the end):

Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869040]

I'm a little frustrated with re-building the blktap user-space tools myself. When I do so, I get the following kernel messages:

Nov 13 13:44:08 dom0-0-50-45-5d-6a-bc kernel: blk_tap: invalid user buffer -- could not remap it
Nov 13 13:44:08 dom0-0-50-45-5d-6a-bc kernel: blk_tap: Reached Fail_flush
Nov 13 13:44:08 dom0-0-50-45-5d-6a-bc kernel: blk_tap: BLKTAP_INVALID_HANDLE

But I don't get these when I use the (PAE) binary distribution. I'm only rebuilding the blktap tools, not the rest, so perhaps my config is not right (incompatible with the PAE kernel somehow). If you know off-hand what the problem is then I can maybe chase down the offset issue more productively.

Regards
Roland

Full debug syslog of qcow creation and dom-U launch using tap:qcow root FS:

Nov 14 11:56:26 dom0-0-50-45-5d-6a-bc qcow-create: Qcow_create: size 10737418240 Nov 14 11:56:26 dom0-0-50-45-5d-6a-bc qcow-create: Backing file size detected: 3123200 sectors(total 1599078400 [1525 MB]) Nov 14 11:56:26 dom0-0-50-45-5d-6a-bc qcow-create: L1 Table offset: 4096, size 6104 Nov 14 11:56:26 dom0-0-50-45-5d-6a-bc qcow-create: Adjusted filelength to 12288 for 4 Kbyte alignment Nov 14 11:56:26 dom0-0-50-45-5d-6a-bc qcow-create: QCOW file successfully created Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received a poll for a new vbd Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: /dev/xen/blktap1 device already exists Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received device id 1 and major 254, sent domid 3 and be_id 2049
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Detected handle: [qcow]
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Process does not exist:
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Launching process, CMDLINE [tapdisk /dev/xen/tapctrlwrite1 /dev/xen/tapctrlread1] Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Write_msg called: CTLMSG_PID Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc TAPDISK: Tapdisk: Received msg, len 8, type 9, UID 13691
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received CTLMSG_PID_RSP
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL:       PID: [21862]
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Write_msg called: CTLMSG_PARAMS, sending [qcow:/mnt/instance_image_store_0/2.qcow, /mnt/instance_image_store_0/2.qcow]
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Generated cookie, 13691
Nov 14 11:56:27 dom0-0-50-45-5d-6a-bc TAPDISK: Tapdisk: Received msg, len 43, type 1, UID 13691
Nov 14 11:56:28 dom0-0-50-45-5d-6a-bc kernel: tap tap-3-2049: 2 getting info
Nov 14 11:56:28 dom0-0-50-45-5d-6a-bc TAPDISK: Received CTLMSG_PARAMS: [/mnt/instance_image_store_0/2.qcow] Nov 14 11:56:28 dom0-0-50-45-5d-6a-bc TAPDISK: Loaded driver: name [tapdisk_qcow], type [4] Nov 14 11:56:28 dom0-0-50-45-5d-6a-bc TAPDISK: QCOW: Opening /mnt/instance_image_store_0/2.qcow Nov 14 11:56:29 dom0-0-50-45-5d-6a-bc TAPDISK: L1 Table offset detected: 4096, size 6104 (8192)
Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc TAPDISK: Reading backing file data
Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc TAPDISK: AIO state initialised
Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc TAPDISK: Adding fd_list_entry
Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc TAPDISK: Entered cookie 13691
Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received CTLMSG_IMG: 3123200, 512, 0 Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received a poll for a new devmap Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/3/2050 Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: add XENBUS_PATH=backend/vbd/3/2051 Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/blktap: add XENBUS_PATH=backend/tap/3/2049 Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/vif-aes: online XENBUS_PATH=backend/vif/3/0 Nov 14 11:56:30 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Write_msg called: CTLMSG_NEWDEV Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/blktap: Writing backend/tap/3/2049/hotplug-status connected to xenstore. Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc TAPDISK: Tapdisk: Received msg, len 12, type 4, UID 13691 Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc TAPDISK: Retrieving state, cookie 13691.....[OK]
Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Received CTLMSG_NEWDEV_RSP
Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc BLKTAPCTRL: Exiting map_new_blktapctrl
Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: Writing backend/vbd/3/2051/physical-device fd:4 to xenstore. Nov 14 11:56:31 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: Writing backend/vbd/3/2051/hotplug-status connected to xenstore. Nov 14 11:56:32 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: Writing backend/vbd/3/2050/physical-device fd:3 to xenstore. Nov 14 11:56:32 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/block: Writing backend/vbd/3/2050/hotplug-status connected to xenstore. Nov 14 11:56:32 dom0-0-50-45-5d-6a-bc kernel: ADDRCONF(NETDEV_UP): vifI93276.0: link is not ready Nov 14 11:56:33 dom0-0-50-45-5d-6a-bc logger: /etc/xen/scripts/vif-aes: Writing backend/vif/3/0/hotplug-status connected to xenstore. Nov 14 11:56:50 dom0-0-50-45-5d-6a-bc kernel: ADDRCONF(NETDEV_CHANGE): vifI93276.0: link becomes ready Nov 14 11:57:01 dom0-0-50-45-5d-6a-bc kernel: vifI93276.0: no IPv6 routers present Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869040] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869048] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869056] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869064] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869072] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869080] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869088] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869096] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869104] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869112] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869120] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869128] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869136] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869144] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869152] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869160] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869168] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869176] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869184] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869192] Nov 14 11:59:47 dom0-0-50-45-5d-6a-bc TAPDISK: AIO_LOCK or iocb_free_count (0) failed[869200]



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