On Mon, Dec 7, 2015 at 6:33 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > On Mon, Dec 07, 2015 at 05:59:41PM -0800, Andy Lutomirski wrote: > >> If I dump all task states (see attached typescript), I see a bunch of >> things blocked in 9p rpc. This makes me think it could be a QEMU bug, >> not a kernel bug. > > Maybe, maybe not - I'd suggest dumping the 9p traffic and checking the > request and response IDs; at least one bug in that area got fixed > (see commit a84b69 for gory details). > > Really, check if something gets screwed with IDs. They should be unique > among outstanding requests and never reused until either a response > with the matching ID arrives, *or* TFLUSH on that ID is sent and reply > has arrived. If those rules get buggered, it's very easy to get hangs > like that. Trace attached. I don't see anything wrong, but I also don't know what I'm looking for. --Andy -- Andy Lutomirski AMA Capital Management, LLC
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