Bug#660554: [3.1 -> 3.2.6 regression] [xen dom0] BUG at drivers/dma/ioat/dma_v2.c:163 at boot

[Thomas Goirand <zigo@debian.org>]

On 02/20/2012 05:11 AM, Jonathan Nieder wrote:
> Hi Thomas,
> 
>> kernel BUG at [...]/drivers/dma/ioat/dma_v2.c:163!M
> [...]
>> Pid: 0, comm: swapper/0 Not tainted 3.2.0-1-686-pae #1 Supermicro X8STi/X8STi
>> EIP: 0061:[<f74df33d>] EFLAGS: 00010246 CPU: 0
>> EIP is at __cleanup+0xd6/0x113 [ioatdma]
> 
> This is
> 
> 	active = ioat2_ring_active(ioat);
> 	for (i = 0; i < active && !seen_current; i++) {
> 		...
> 		if (tx->phys == phys_complete)
> 			seen_current = true;
> 	}
> 	...
> 	BUG_ON(active && !seen_current); /* no active descs have written a completion? */
> 
> Can you reproduce it with the -amd64 kernel or with 3.3-rc4?

Hi,

I just tried with the amd64 kernel and Xen, and I didn't see any issue.

However, it is important that Xen 4.1 + Linux 3.2 works with a 32 bits
kernel, because that is the most optimized configuration (eg: 64 bits
hypervisor, 32 bits kernel and 32 bits userland).

I didn't see any 3.3-rc4 kernel package in Debian. Is it planned to be
uploaded to Experimental or something?

Thomas