XCP

blktap-dkms links to missing symbols in kernel 3.5

Bug #1028135 reported by Mike McClurg
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
XCP
Fix Committed
Critical
Mike McClurg
blktap-dkms (Ubuntu)
Fix Released
Critical
Mike McClurg

Bug Description

The blktap-dkms kernel module links to two symbols which were removed from the 3.5 kernel tree. dmesg shows the following:

$ dmesg | grep blktap
[ 18.067395] blktap: Unknown symbol do_munmap (err 0)
[ 18.067478] blktap: Unknown symbol do_mmap_pgoff (err 0)

It seems that the new functions are called vm_munmap and vm_mmap_pgoff.

This bug prevents the blktap kernel module from loading, and in turn prevents xcp-xapi from starting at all.

Revision history for this message
Mike McClurg (mike-mcclurg) wrote :

Marking confirmed.

Changed in blktap-dkms (Ubuntu):
assignee: nobody → Mike McClurg (mike-mcclurg)
status: New → Confirmed
Revision history for this message
Mike McClurg (mike-mcclurg) wrote :

Unverified fix:

https://github.com/mcclurmc/blktap-dkms/commit/d33302b91d42e605f64e561488811064028cc4d1

This fix "works" in that it compiles and the resulting module loads cleanly ;) Need to do some testing tomorrow.

Changed in blktap-dkms (Ubuntu):
status: Confirmed → In Progress
Mike McClurg (mike-mcclurg)
Changed in xcp:
assignee: nobody → Mike McClurg (mike-mcclurg)
importance: Undecided → Critical
Revision history for this message
Tamas Lengyel (tamas-k-lengyel) wrote :

The fix seems to be running fine for me. No issues so far with several qcow2 xen vm's.

Revision history for this message
Mike McClurg (mike-mcclurg) wrote :

I haven't uploaded this fix yet ;) Anyway, blktap doesn't speak qcow, so I don't think that the issue would manifest itself for you. The issue is that the blktap kernel module doesn't even build on the 3.5 kernel without the patch that I referred to in #2.

Revision history for this message
Mike McClurg (mike-mcclurg) wrote :

I've resolved this issue in upstream blktap-dkms, and pushed the updated deb package to the xcp-unstable PPA [1]. The fixed version is blktap-dkms-2.0.93-1ubuntu1~quantal. The upstream source repo is here [2] if anyone wants to take a look.

I'll see if I an initiate a requestsync directly from the PPA. This fix hasn't been able to go into Debian yet, because they haven't put kernel 3.5 into Sid yet (I think it just hit experimental, so I'll see about getting this package into experimental).

[1] https://launchpad.net/~ubuntu-xen-org/+archive/xcp-unstable/
[2] https://github.com/mcclurmc/blktap-dkms/

Changed in xcp:
status: New → Fix Committed
Changed in blktap-dkms (Ubuntu):
status: In Progress → Fix Committed
James Page (james-page)
Changed in blktap-dkms (Ubuntu):
importance: Undecided → Critical
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package blktap-dkms - 2.0.93-0ubuntu1

---------------
blktap-dkms (2.0.93-0ubuntu1) quantal; urgency=low

  * New upstream release which fixes compatiblity with linux 3.5
    kernel (LP: #1028135).
 -- James Page <email address hidden> Fri, 07 Sep 2012 17:28:22 +0100

Changed in blktap-dkms (Ubuntu):
status: Fix Committed → Fix Released
Revision history for this message
Mike McClurg (mike-mcclurg) wrote :

Thanks James!

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