On Wed, Jan 2, 2013 at 8:17 PM, Christoffer Dall <cd...@cs.columbia.edu> wrote: > I am seeing some brutal crashes with QEMU running virtio using KVM/ARM. > > The culprit seems to be when the process runs out of virtual address > space on 32-bit systems due to some subsystem (virtio?) creating a > large number of pthreads under heavy workloads.
It would be interesting to see the resource utilization at the point of failure - virtual memory, number of threads, etc. > Unfortunately my QEMU expertise is too limited to pin-point the exact > fix, nor do I have resources right now to go into it, but I wanted to > raise this issue and spread general awareness. > > Is this a known issue or something that needs to be tracked/documented at > least? If you launch QEMU under gdb it will break when qemu_thread_create() fails to create a new thread. This may be coming from thread-pool.c:do_spawn_thread(). It shouldn't be a fatal error since eventually an existing worker thread will process the queued work. Please post the backtrace so it's clear where QEMU hits the failure. Stefan
