The proposed fix seems not yet part of any qemu release but applied as

commit bdf026317daa3b9dfa281f29e96fbb6fd48394c8
Author: 马文霜 <kevin...@tencent.com>
Date:   Wed Jul 1 15:41:41 2015 +0200

    Fix irq route entries exceeding KVM_MAX_IRQ_ROUTES

to v2.4.0-rc0. So this would affect all current releases and the current
development release (Wily/15.10). I would start there with
reproduction/verification and work backwards from there.

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https://bugs.launchpad.net/bugs/1465935

Title:
  kvm_irqchip_commit_routes: Assertion `ret == 0' failed

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Confirmed
Status in qemu source package in Precise:
  New
Status in qemu source package in Trusty:
  New
Status in qemu source package in Utopic:
  New
Status in qemu source package in Vivid:
  New

Bug description:
  Several my QEMU instances crashed, and in the  qemu log, I can see
  this assertion failure,

     qemu-system-x86_64: /build/buildd/qemu-2.0.0+dfsg/kvm-all.c:984:
  kvm_irqchip_commit_routes: Assertion `ret == 0' failed.

  The QEMU version is 2.0.0, HV OS is ubuntu 12.04, kernel 3.2.0-38.
  Guest OS is RHEL 6.3.

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