[Xen-users] BLKTAP under Debian Lenny - not working

[Darko Petrović <darko.b.petrovic@xxxxxxxxx>]

Hi all,

When I try to use tap:aio configuration I get the following error message upon executing xm create:
Error: Failed to create device.
    stdout: unrecognized child response
    stderr: 
Check that target "/dev/vg0/lvol0" exists and that blktap2 driver installed in dom0.

This is what I find in /var/log/syslog:
Feb 23 11:37:38 xen-1 tapdisk2[3523]: Created /dev/xen/blktap-2/blktap2 device
Feb 23 11:37:38 xen-1 tapdisk2[3523]: Created /dev/xen/blktap-2/tapdev2 device
Feb 23 11:37:38 xen-1 tapdisk2[3523]: new interface: ring: 252, device: 254, minor: 2

Feb 23 11:37:38 xen-1 tapdisk2[3523]: I/O queue driver: lio
Feb 23 11:37:38 xen-1 tapdisk2[3523]: Incorrect magic in shared info.
Feb 23 11:37:38 xen-1 tapdisk2[3523]: Failed to open shared info.
Feb 23 11:37:38 xen-1 kernel: [ 1002.545721] blktap_sysfs_create: adding attributes for dev ec6f00c0

Feb 23 11:37:38 xen-1 kernel: [ 1002.545728] blktap_control_allocate_tap: allocated tap c1ef8800
Feb 23 11:37:38 xen-1 kernel: [ 1002.547589] tapdisk2[3523]: segfault at 10 ip b758aa00 sp bfd07dd4 error 4 in libpthread-2.7.so[b7583000+15000]

Feb 23 11:37:38 xen-1 logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vkbd/4/0
Feb 23 11:37:38 xen-1 logger: /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vfb/4/0

Here is also the corresponding part of my DomU configuration file:

disk = ['tap:aio:/dev/vg0/lvol0,xvda,w','tap:aio:/dev/vg0/swap,xvdb,w']

The pv_ops dom0 kernel is compiled with CONFIG_XEN_BLKDEV_TAP=y. Both lvol0 and swap do exist, I've double-checked it (namely, they work with phy: instead of tap:aio).

What could be wrong?

Cheers,
Darko
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