[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Re: [PATCH] SMP dom0 boot fix

On 28 Oct 2005, at 15:59, Ryan Harper wrote:

At this point send_IPI_allbutself() has been invoked and the system
just sits and waits on CPU1 to run the function.  But, CPU1's
evtchn_upcall_mask was set (1), so I'm guessing the pending interrupt
is never acknowledged.

Okay, the good news is that's the same bug I was able to repro last week. Turns out that CPU1's upcall mask is getting weirdly set under its feet. Since it's waiting on the big kernel lock, which is held by CPU0, which is waiting for acknowledgement of an interrupt in CPU1, we have a deadlock.

Given the problem is in that one changeset, this can't be hard to track down now.

 -- Keir

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.