Messages in this thread | | | Date | Thu, 2 Jul 2015 09:25:30 +0100 | From | Al Viro <> | Subject | Re: running out of tags in 9P (was Re: [git pull] vfs part 2) |
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On Thu, Jul 02, 2015 at 11:19:03AM +0300, Andrey Ryabinin wrote: > Besides qemu, I've also tried kvmtool with the same result. IOW I'm seeing > this under kvmtool as well. It just takes a bit longer to reproduce > this in kvmtool. > > > The bug I suspected to be the cause of that is in tag allocation in > > net/9p/client.c - we could end up wrapping around 2^16 with enough pending > > requests and that would have triggered that kind of mess. However, Andrey > > doesn't see that test (tag wraparound in p9_client_prepare_req()) trigger. > > BTW, was that on the run where debugging printk in p9_client_write() *did* > > trigger? > > Yes, WARN_ON_ONCE() in p9_client_prepare_req() didn't trigger, > but debug printk in p9_client_write() *did* trigger.
Bloody wonderful... Could you check if v9fs_write() in qemu hw/9pfs/virtio-9p.c ever gets to offset = 7; err = pdu_marshal(pdu, offset, "d", total); with total > count on your testcase?
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