kernel oops fix for virtio_blk

[mirco.bauer]

Hi,

I came across a kernel oops happening from time to time (about once per week) on my KVM 32bit Linux guests with virtio-blk.

The oops happens in __bounce_end_io_read. This bug was fixed with a trivial patch:
http://patchwork.kernel.org/patch/31582/ and was already applied to 2.6.31-rc4:
http://www.pubbs.net/kernel/200907/71290/

Please consider applying this patch too!

 

[dietmar]

That patch does not apply to 2.6.24?

 

[mirco.bauer]

That patch does not apply to 2.6.24?

I have not verified the 2.6.24 sources nor the patch itself. I don't know which virtio version proxmox uses, I only researched the symptom and possible fixes for it.

 

[mirco.bauer]

Update on this issue:
it happens more often with higher I/O load, we are getting that oops (which is a crash btw) 2 or 3 times per day. But the bug is on the guest linux kernel, not the hypervisor... The guest kernel is Debian 2.6.26 but ot seems that only 32-bit guests are affected. A workaround is to use the scsi driver instead.